Description

SM7523B is an off-line low power AC/DC switching power supply chip used in high-performance primary feedback control systems. It is designed to provide high precision constant current output over the full input voltage range, with an accuracy of less than ±5%. This chip eliminates the need for loop compensation and allows for cost reduction by eliminating the need for additional components such as optocouplers, TL431 and transformer auxiliary winding. It also features internal chip-by-cycle peak current limit, FB overvoltage protection, output open/short protection, and soft start power protection, all of which contribute to improved system reliability.

Specifications and features

- Applied to off-line low power AC/DC switching power supplies

- High-performance primary feedback control power switch chip

- High precision constant current output over the full input voltage range

- Accuracy of less than ±5%

- Eliminates the need for loop compensation and additional components (optocouplers, TL431, transformer auxiliary winding)

- Reduces costs

- Internal chip-by-cycle peak current limit

- FB overvoltage protection

- Output open/short protection

- Soft start power protection

- Improved system reliability

Application Scenarios

SM7523B can be used in various applications, including:

- Off-line low power AC/DC switching power supplies

Comparison

- High precision constant current output

- Eliminates the need for additional components

- Reduces costs

- Improved system reliability

- No loop compensation

- Limited application to off-line low power AC/DC switching power supplies