STR-X6556 Datasheet PDF – Sanken Zip 7 Pin

Part Number : STR-X6556

Function : Power IC for quasi-resonant type switching power supply

Package : TO-3PF-7 ZIP Type

Manufacturers : Sanken Electric co.,ltd.

Image :
STR-X6556 image


1. Multi operation mode, The operation mode switching according to load conditions achieves the optimal high efficiency and low noise power supply systems across the full load range.
2. Current mode control
3. Built-in PWM oscillator, The PWM operates with the minimum frequency of around 22kHz, until the quasi-resonant signal becomes valid, reduces the stress on components at startup and load-shorted.


1. LCD-TVs, PDP-TVs, CRT-TVs and Digital consumer equipment
2. Home appliances
3. OA equipments
4. Industry machines
5. Communication devices

Pinout :

STR-X6556 Datasheet, STRX6556 Pinout

STR-X6556 Information

[ strx6556 based smps schematic circuit ]

Other data sheets within the file : STRX6556

The STR-X6729 is a quasi-resonant topology IC designed for SMPS applications. It shows lower EMI noise characteristics than conventional PWM solutions, especially at greater than 2 MHz. It also provides a soft-switching mode to turn on the internal MOSFET at close to zero voltage (VDS bottom point) by use of the resonant characteristic of primary inductance and a resonant capacitor.

The package is a fully molded TO-3P, which contains the controller chip (MIC) and MOSFET, enabling output power up to 460 W at 120 VAC input. The bottom-skip mode skips the first bottom of VDS and turns on the MOSFET at the second bottom point, to minimize an increase of operating frequency at light output load, improving system-level efficiency over the entire load range.