摘要

The DK1203 is a secondary-side flyback controller integrated circuit (IC) designed to simplify power supply design in various electronic applications. It is particularly notable for its integration of a 700V high-voltage power transistor and a patented self-power supply circuit, which reduces the need for external components and simplifies transformer design by requiring only two windings. This makes the DK1203 highly suitable for a wide range of applications, including AC/DC power adapters, DVD/VCD power supplies, air conditioner power supplies, and LED drivers

. Operating within an 85-265V AC input range and capable of outputting up to 12W of power, the DK1203 employs a pulse-width modulation (PWM) controlled system with a switching frequency of 65kHz. This frequency is carefully chosen to balance efficiency with effective management of electromagnetic interference (EMI). The IC features automatic entry into skip cycle mode under light load conditions to enhance energy efficiency and includes comprehensive protection mechanisms, such as overcurrent, overload, overtemperature, and overvoltage protections, ensuring reliable operation and safeguarding against potential damage. One of the standout aspects of the DK1203 is its ease of implementation. The IC’s self-starting capability eliminates the need for an external resistor, thereby further reducing component count and simplifying circuit design. With a low standby power consumption of less than 0.3W, it is ideal for energy-saving applications, aligning with global energy efficiency standards. These features collectively contribute to making the DK1203 a versatile and cost-effective choice for modern power supply systems. The DK1203 has garnered significant attention in the market, evidenced by its adoption across various platforms and industries. Its combination of advanced features, simplified design, and robust protection mechanisms has positioned it as a reliable solution for designers seeking efficient and compact power supply control. With the growing demand for energy-efficient power solutions, the DK1203 is well-positioned to meet the needs of both current and future applications.

设计与开发

The DK1203 is a secondary side flyback controller IC designed primarily for use in power adapters and consumer electronics. The IC integrates a 700V high-voltage power transistor and a patented self-power supply circuit, which simplifies the overall design by reducing the number of external components required and making transformer design less complex, requiring only two windings

. The DK1203 is capable of operating from an 85-265V AC input and can output up to 12W of power, making it suitable for a wide range of applications including AC/DC power adapters, DVD/VCD power supplies, air conditioner power supplies, and LED drivers. The DK1203 features a pulse-width modulation (PWM) controlled system with a switching frequency of 65kHz. This frequency is high enough to ensure efficiency but low enough to manage electromagnetic interference (EMI) effectively. The internal frequency modulation circuit further aids in reducing EMI filter costs. One of the standout features of the DK1203 is its ability to automatically enter a skip cycle mode under light load conditions, thereby improving energy efficiency. Additionally, the IC includes comprehensive protection mechanisms such as overcurrent, overload, overtemperature, and overvoltage protection, which ensure reliable operation and safeguard against potential damage. The IC starts itself without the need for an external resistor due to its internal high-voltage starting circuit. This feature eliminates the need for additional components and simplifies the circuit design. Moreover, the DK1203 maintains a low standby power consumption of less than 0.3W, which is crucial for energy-saving applications.

技术规格

The DK1203 is a secondary side flyback type AC-DC switch mode power controlling IC designed for efficiency and integration. It features an input voltage range of 85V to 265V, accommodating a broad range of applications

. A built-in 700V power transistor and patented self-powered circuit eliminate the need for an auxiliary winding power supply, simplifying the transformer design . The IC operates within a VCC voltage range of 4V to 6V and employs current mode PWM control . One of the standout features of the DK1203 is its high-frequency operation, with a switching frequency of 65kHz, which helps reduce the size and cost of EMI filtering . The IC also supports auto-enter skip cycle mode at light load, reducing standby power consumption to less than 0.3W . For protection, the DK1203 includes over-temperature, over-current, over-voltage, and overload protection mechanisms . Additional features of the DK1203 include frequency jitter to further reduce EMI filtering costs and a built-in self-starting circuit, which enhances reliability and ease of use . These technical specifications make the DK1203 an efficient and cost-effective choice for various low power offline switching power applications.

Internal Schematic and Components

The DK1203 is a secondary-side flyback type AC-DC Switch Mode Power Control IC, integrating several key components and circuits to enhance performance and reliability. This section details its internal schematic and core components.

Key Components and Features

Integrated 700V Power Transistor

One of the standout features of the DK1203 is its built-in 700V high voltage power transistor. This component significantly reduces the need for external parts, simplifying the overall design of the power supply circuit. The integrated transistor allows for efficient energy conversion and management within a wide input voltage range of 85V to 265V

.

Patented Self-Powered Circuit

The DK1203 incorporates a patented self-powered circuit, eliminating the need for an auxiliary winding power supply. This self-sufficient design not only saves space but also enhances the IC’s operational reliability by reducing the complexity of the external transformer design. Only two windings are required for the transformer in an isolated output circuit

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Self-Starting Circuit

An integrated self-starting circuit is included in the DK1203, ensuring smooth power-up operations. This circuit manages the initial charging of the external VDD energy storage capacitor and ensures that the control logic begins to output PWM pulses once the VDD voltage reaches 5.2V

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Current Mode PWM Control

The DK1203 employs current mode Pulse Width Modulation (PWM) control, providing precise regulation of the output voltage. The PWM signal controls the switching of primary-side components like MOSFETs, determining the on-time and off-time of the switches. This regulation mechanism is critical for maintaining stable voltage or current output

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保护功能

The IC integrates multiple protection mechanisms to safeguard against operational anomalies:

• Over-Temperature Protection: Prevents damage from excessive heat.
• Over-Current Protection: Ensures the IC does not operate beyond its current handling capabilities.
• Over-Voltage Protection: Shields the circuit from voltage spikes.
• Overload Protection: Protects the IC during heavy load conditions .

附加功能

The DK1203 is designed for efficient operation with features such as a 65kHz switching frequency and automatic entry into skip cycle mode at light loads, which helps in reducing power consumption. The IC also features frequency jitter to reduce Electromagnetic Interference (EMI) filtering costs

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Schematic Overview

The internal schematic of the DK1203 comprises various interconnected blocks that coordinate to manage the power control functions:

1. Input Voltage Management: Accepts a wide range of input voltages (85V to 265V AC) and includes circuits to handle these variations effectively .
2. Power Transistor and Switching Control: The integrated 700V power transistor works in conjunction with the current mode PWM control to regulate the switching of the primary-side power components .
3. Feedback Control Loop: Monitors the output voltage and adjusts the PWM duty cycle to maintain desired output levels .
4. 保护电路: Continuously monitor temperature, current, voltage, and load conditions to trigger protective actions when necessary . The holistic integration of these components ensures that the DK1203 delivers reliable performance across a variety of applications, including AC/DC power adapters, LED power supplies, and other electronic devices [7

應用領域

The DK1203 IC is versatile and can be utilized in a wide range of power supply applications. These include AC/DC power adapters, DVD/VCD power supplies, air conditioner power supplies, electromagnetic oven power supplies, DVB power supplies, LED driver applications, and TV/Monitor power supplies

. This secondary side flyback type AC-DC Switch Mode Power Controlling IC is particularly suitable for small power off-line switching power supplies, thanks to its built-in 700V high voltage power transistor and patented self-power supply circuit, which simplifies transformer design by requiring only two windings for the transformer in isolated output circuits. Additionally, the DK1203 IC features an 85V to 265V wide range AC power input, integrated high voltage starting circuit, self-start circuit, and a Pulse-Width Modulation (PWM) controlled system. This makes it an excellent choice for applications needing robust protection mechanisms, such as overcurrent, overloading, overtemperature, and overvoltage protection. These attributes ensure that the DK1203 IC meets the demanding requirements of modern power supply systems while maintaining high efficiency and reliability.

制造工艺

The manufacturing process of the DK1203 IC involves a series of meticulous steps designed to ensure product quality and reliability. Each step, from initial production to final packaging, adheres to strict industry standards to provide customers with a dependable power supply control chip.

Production and Quality Control

During the production phase, the DK1203 IC is fabricated using advanced semiconductor manufacturing techniques. The process begins with the creation of the IC’s internal structure, which includes the integration of a high-voltage power transistor and a self-powered circuit. This design minimizes the need for additional external components and simplifies the overall circuit configuration

. Once the ICs are produced, they undergo a comprehensive pre-shipment inspection (PSI). This inspection is systematic and involves selecting samples randomly from each batch to ensure consistency and quality. The PSI focuses on various potential defects, including deficiencies in quantity, incorrect deliveries, and external defects such as breakage or rust.

包裝

Packaging is a critical aspect of the manufacturing process, aimed at protecting the DK1203 ICs during transit.

1. Initial Packaging: Products are first placed in vacuum-sealed packaging to prevent contamination and moisture ingress.
2. Anti-Static Protection: Each IC is then enclosed in an anti-static bag to safeguard against electrostatic discharge (ESD).
3. Individual and Group Packaging: ICs are individually packaged and then grouped into larger packaging boxes. Each box includes a bar-code shipping tag for easy tracking and inventory management.
4. Labeling: The exterior of the ESD packing is labeled with essential company information, including the part number, brand, and quantity.

船運

Upon completion of the packaging process, the DK1203 ICs are prepared for shipment. The products are inspected to ensure they are in good condition and match their datasheet specifications. Shipping is carried out using industry-leading freight companies, including DHL, FedEx, UPS, TNT, and Registered Mail. Customers are notified of the shipping status and provided with tracking information via email

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Return and Warranty Policy

In the event of any issues with the DK1203 ICs, customers are supported by a robust return and warranty policy. Products can be returned or replaced if the defect is reported within 90 days of delivery, and the ICs are unused and in their original packaging. The company offers a 365-day warranty on all products, guaranteeing their quality and performance

. The DK1203 IC’s manufacturing process exemplifies a commitment to quality, reliability, and customer satisfaction, ensuring that each chip performs optimally in its intended applications.

Packaging Methods

The packaging of the DK1203 IC follows a rigorous and structured process to ensure product quality and protection during shipment. The packaging process consists of several steps designed to provide maximum protection against electrostatic discharge (ESD) and physical damage.

1. Product Preparation: Initially, the products are prepared for packaging. This involves ensuring that the DK1203 IC is unused and remains in its original unpacked packaging.
2. Vacuum Packaging: Following product preparation, the items are vacuum-packed to remove any air and reduce the risk of oxidation or contamination. This step ensures that the products remain in optimal condition during transit.
3. Anti-Static Bag: Each DK1203 IC is then placed into an anti-static bag to prevent damage from electrostatic discharge. This is a crucial step in maintaining the integrity of the electronic components.
4. Individual Packaging: After being secured in anti-static bags, the products are individually packaged. This step adds an additional layer of protection against physical impacts and ensures that each component remains separate.
5. Packaging Boxes: The individually packaged items are then placed into sturdy packaging boxes. These boxes provide a robust outer shell to shield the components from external shocks during shipping.
6. Bar-Code Shipping Tag: Finally, a bar-code shipping tag is affixed to the outside of the packaging. This tag includes the company’s information, such as part number, brand, and quantity, facilitating tracking and identification during the shipping process. Throughout this comprehensive packaging procedure, all products are inspected to ensure they are in good condition and match the datasheet specifications. This meticulous attention to detail ensures that all products are new, original, and free from defects before they are shipped. The packaging exhibits excellent puncture and tear resistance, along with good seal integrity, providing a high level of assurance that the DK1203 IC will arrive in excellent condition.

与同类集成电路的比较

When comparing the DK1203 to other ICs used in switching power supplies, several distinct features and operational characteristics stand out.

Feature Set and Design

The DK1203 is noted for its secondary side flyback configuration, integrating a 700V high voltage power transistor, which minimizes the need for external components and simplifies transformer design by requiring only two windings in the isolated output circuit

. In comparison, similar ICs such as the FSGN300N include additional components like a startup pin and auxiliary coil to supply the IC, which may complicate design and assembly.

Self-Supply Circuit

A key differentiator of the DK1203 is its patented self-power supply circuit, which eliminates the need for an external resistor for startup. This feature simplifies the circuit and reduces component count, leading to cost savings and potentially higher reliability

. Other ICs often require an auxiliary winding to charge the VCC capacitor during startup, as seen with the FSGN300N, making their designs more complex and potentially less reliable over time, especially in storage.

Protection and Efficiency

The DK1203 is equipped with comprehensive protection features, including overcurrent, overloading, overtemperature, and overvoltage protections

. These features ensure robust operation in various conditions, which is comparable to many modern ICs designed for similar applications. Additionally, the DK1203 operates at a switching frequency of 65kHz and automatically shifts to skip cycle mode under light load conditions, optimizing efficiency and reducing standby power consumption to below 0.3W. This level of efficiency is competitive with other ICs in the market, which often prioritize low power consumption and high efficiency in their designs.

Applications and Suitability

The DK1203 is particularly suitable for use in AC/DC power adapters and small power applications such as 12V 1A and 5V 2A SMPS adapters

. Its wide input voltage range of 85V—265V makes it versatile for global applications, whereas some ICs may have more restrictive input voltage ranges or may require additional circuitry to handle such a wide range reliably.

市场采用

The DK1203 IC, a secondary side flyback type AC-DC Switch Mode Power Controlling IC, has garnered significant attention in the market due to its integrated features and ease of use. Its patented self-power supply circuit and integrated MOS circuit design contribute to reducing the number of external components needed, thereby simplifying the transformer design process, which only requires two windings for the transformer in an isolated output circuit

. These attributes make the DK1203 suitable for various applications, including 12V 1A and 5V 2A SMPS adapters. As of the latest updates, Jotrin Electronics lists the DK1203 as a popular item, although it advises customers to confirm inventory and order details with their sales representatives due to frequent fluctuations in stock levels. This step ensures that customers receive accurate and timely information about the availability and pricing of the DK1203. The IC is available for purchase through various channels, including online and offline orders. Customers placing orders online can enjoy benefits such as coupons and selected gifts. The IC is shipped via industry-leading freight companies like DHL, FedEx, UPS, TNT, and Registered Mail, with delivery times ranging from 2 to 60 days depending on the chosen shipping method. The diverse payment options accepted by Jotrin—TT Bank, PayPal, Credit Card, Western Union, and Escrow—further ease the procurement process. Returns and replacements of the DK1203 are managed meticulously, with a Pre-Shipment Inspection (PSI) performed to ensure product quality. Issues such as deficiencies in quantity, delivery of incorrect items, or apparent external defects are addressed under specific conditions. This robust support system underlines the commitment to customer satisfaction and product reliability, thereby enhancing the DK1203’s market adoption. The widespread availability of the DK1203 across multiple platforms, coupled with extensive language support on datasheet sites like ALLDATASHEET.COM, has further facilitated its adoption across different regions and industries. This accessibility, along with comprehensive after-sales support, underscores the growing adoption of the DK1203 IC in various electronic applications.

Advantages Over Similar ICs

The DK1203 IC offers several advantages over similar integrated circuits in the domain of power management and conversion. One of the primary advantages is its built-in 700V high-voltage power transistor, which eliminates the need for additional external high-voltage components and simplifies the overall design of the power supply

. This feature, coupled with the integrated high-voltage constant current starting circuit, results in significant component savings and a streamlined design process . The DK1203 is also noted for its energy efficiency, with a standby power consumption of less than 0.3W. This is achieved through the use of burst mode operation and dynamic Pulse Frequency Modulation (PFM), which help reduce power usage during low-load conditions and meet stringent energy efficiency standards such as European green energy requirements . The built-in frequency jitter function further enhances efficiency by reducing electromagnetic interference (EMI) filtering costs and improving circuit stability during various operating conditions . In terms of protection features, the DK1203 is well-equipped with over-temperature, overcurrent, overvoltage, and output short circuit protections. These features ensure the reliability and longevity of the power supply, making it suitable for a wide range of applications, including power adapters, LED power supplies, and various consumer electronics like induction cookers and set-top boxes . The IC’s capability to output up to 12W from an 85-265V AC input makes it versatile for various power requirements, further setting it apart from similar ICs that may not offer such a wide input range or robust protection features . Another significant advantage is the DK1203’s self-powered technology, which eliminates the need for an external auxiliary winding power supply. This not only simplifies the design but also reduces the cost and complexity associated with external components . The use of a flyback topology in the DK1203 also supports efficient power conversion and is particularly effective for isolated output circuits, which are commonly required in power adapters and other safety-critical applications .

未来展望

The DK1203 IC, with its advanced integrated functionalities and high-performance features, holds significant potential for future developments in power supply design. Given the growing demand for energy-efficient and compact power solutions, the DK1203 is well-positioned to meet the needs of various applications ranging from consumer electronics to industrial machinery

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Advancements in Power Management

The trend towards digital power conversion and control is likely to see further integration of digital signal controllers (DSCs) and advanced PWM (Pulse Width Modulation) controllers. These advancements will enhance the capabilities of ICs like the DK1203, allowing for more precise and efficient power management

. The integration of on-chip Analog-to-Digital Converters (ADCs) and high-resolution Pulse Width Modulators (PWMs) in future versions could provide even greater control over power supply topologies.

Ultra-Low Standby Power Consumption

One of the key features of the DK1203 is its ultra-low standby power consumption achieved through hybrid technology involving Burst mode, Dynamic PFM, and Hi mode pulse power regulation

. As energy efficiency standards become more stringent worldwide, the demand for ICs that can operate with minimal power consumption in standby mode is expected to rise. This trend positions the DK1203 as a favorable choice for designers looking to comply with new regulations and reduce overall energy usage.

Simplified Design and Cost Efficiency

The DK1203’s design simplifies transformer requirements, needing only two windings for the isolated output circuit, which significantly reduces the complexity and cost of power supply designs

. As manufacturers continue to seek ways to cut costs while maintaining performance, the DK1203’s ability to minimize external components will be a strong selling point.

Enhanced Protection Features

The comprehensive protection functions of the DK1203, including output short circuit, secondary open circuit, over temperature, and over voltage protections, ensure high reliability and safety in various applications

. Future improvements may include even more robust protection mechanisms, further increasing the IC’s appeal for critical applications where reliability is paramount.

Broader Market Adoption

As the Internet of Things (IoT) and smart devices proliferate, the need for reliable, efficient, and compact power solutions will continue to grow. The DK1203, with its full voltage input range of 85V-265V, is versatile enough to be adopted across various geographic markets and applications

. This broad applicability ensures its relevance in the evolving landscape of electronic devices and systems.