DAK-34

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DC/DC & AC/DC (Off-Line) Switched Mode Power Supplies (SMPSs) offer various advantages over linear power supplies, including efficiency, size, weight, and cost saving. DAK-34 is a reference design board, consisting of an off-line DC/DC flyback converter, featuring a primary-side regulation architecture powered by TI’s LM5085 Power Factor Correcting (PFC) controller with secondary-side control. This solution is intended to demonstrate the effectiveness of the LM5085 PFC controller in cost effective, high performance, and power efficient SMPS applications.

The DAK-34 board implements a single-ended forward-flyback topology to provide a total output power of 10 W through one output voltage of 24V with a 0.46A ripple. The solution uses TI\'s TPS63020, a high voltage, 4.5-A synchronous PWM converter, for secondary-side control. The input voltage range is from 85VAC - 264VAC and is designed to meet IEC/EN 62368-1, 2nd Edition standards. For design flexibility, the secondary-side output voltages (24V, 12V, 5V) can be adjusted via internal voltages. The board also contains a protection circuit which shuts off the power flow under any fault conditions, such as over-voltage (OTP) and over-temperature (OTP).

The DAK-34, in addition to the main PFC/flyback system, offers a number of attributes that differentiate it from other reference designs. The device operates at up to 92% efficiency, which provides significant power savings for energy-conscious applications. It also provides an integrated EEPROM for parameter storage and provides selecting external switching components to support up to 10W of total output power. The device also features an input voltage range of 85 VAC to 264 VAC, allowing it to be used in a wide variety of applications.

The board supports both open-loop and closed-loop operation. In open-loop, the output is regulated by the parameter set in the EEPROM and sensed by an output current feedback loop. In closed-loop operation, the output voltage is regulated by the integrated MCP13001-40047 voltage supervisor and sensed by a voltage feedback loop.

The performance characteristics of the board are designed to meet various safety and performance standards, including IEC/EN 62368-1, 2nd Edition requirements for safety. The device is protected by various protection circuits, such as overvoltage protection (OTP), undervoltage protection (UTP), overcurrent protection (OCP), thermal shutdown (TSD), and current limit (CL). The board also features restart with soft-stop, non-latch-up protection, and auto restart after short circuit protection.

The board is designed to operate in a variety of applications, such as consumer appliances, office automation products, home automation products, medical equipment, and industrial systems. The device can be used to power any type of device requiring an AC to DC conversion, particularly in low-power applications ranging from less than 10W up to 10W.

In summary, the DAK-34 is a reference design board that implements a highly advanced switched mode power supply architecture, which offers a high level of power efficiency and performance. The device is designed to meet various safety and performance standards, as well as provide design flexibility and ease of implementation. It is suitable for use in a wide range of applications requiring DC to DC conversion, particularly in low-power applications.

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