SM7523 Datasheet – Control Power Switch Chip

Part Number : SM7523

Function : Constant primary control power switch

Package : SOP 8 Pin Type


Pinouts :

SM7523 datasheet


Description :

SM7523 is a high-performance primary-side feedback control power switch chip applied to off-line low-power AC/DC switching power supplies. It achieves high-precision constant current output within the full voltage input range, with an accuracy of less than ±5%, without loop compensation, and The system can save optocouplers, TL431 and transformer auxiliary windings and other components, reducing costs. The chip integrates protection functions such as cycle-by-cycle peak current limit, FB over-voltage protection, output open/short-circuit protection, and boot soft start to improve the reliability of the system.


1. Wide voltage 85Vac~265Vac input voltage range constant current accuracy is less than ±5%

2. Compatible with 1~3W in the full voltage range

3. Mingwei’s patented primary-side feedback control technology without auxiliary winding can save optocoupler, 431 and other components in the system

4. No loop compensation required

5. Built-in leading edge blanking circuit (LEB)

6. Cycle-by-cycle peak current comparison

7. Output open/short circuit protection

8.  Built-in soft start


Application circuits

Other data sheets within the file : SM-7523

SM7523 Datasheet PDF Download

SM7523 pdf

TM1668 Datasheet – LED Display / Keypad Driver

Part Number : TM1668

Function : LED Display/Keypad Driver

Package : SOIC 24 Pin Type

Manufacturers : Shenznen Titan Micro Electronics


TM1668 datasheet


Description :

control 7 Segments & Keys from just 3 MCU I/O, Widely used in induction cooker display.

LED Dedicated drive control circuit.

LED TM1668 is a scanning interface with a keyboard (light-emitting diode display) dedicated drive control circuit, the internal set Into the MCU digital interface, data latches, LED high voltage drive, keyboard scanning circuit. This product is excellent performance, quality Reliable. Mainly used in VCR, VCD, DVD and home theater products such as display drivers. Using SOP24, SSOP24, SKDIP24, SDIP24 the package.

TM1668 pinout


Reference page : LED Display/Keypad Driver [4916] : Sunrom Electronics

TM1668 Datasheet PDF Download

TM1668 pdf