KA3525 Datasheet PDF – SMPS Controller – Fairchild

Part Number : KA3525, KA3525A, KA3525AD


Package : 16 Pin Dip, SOP

Manufactures : Fairchild

KA3525 SMPS Controller


The KA3525 is a monolithic integrated circuit that Included all of the control circuit necessary for a pulse width modulating regulator. There are a voltage reference, an error amplifier, a pulse width modulator, an oscillator, under-voltage lockout, soft start circuit, and output drivers in the chip.



KA3525 datasheet pinout

Absolute Maximum Ratings

1. Supply Voltage VCC 40 V
2. Collector Supply Voltage VC 40 V
3. Output Current, Sink or Source IO 500 mA


1. Oscillator Sync Terminal
2. Internal Soft Start
3. Deadtime Control
4. Under-Voltage Lockout


KA3525 Datasheet


Related articles across the web

STR-W6853 Datasheet PDF – Quasi-Resonant SMPS

Part Number : STR-W6853, STR-W 6800 Series

Function :  Quasi-Resonant SMPS

Package : TO-220-7 Pin Type

Manufacturers : Sanken Electric co.,ltd.

Image :

STR-W6853 datasheet

Description :

STR-W6853 Series ICs” for QuasiResonant SMPS with high efficiency and low noise that consume only one-tenth of the electric power compared with that of our conventional devices.The STR-W6800 Series are thick-film ICs for Quasi-Resonant flyback SMPS with MOSFET and control built-in, featuring fewer external components, simplified circuit design, small-size and standard power supply.

“STRW6853 Series ICs” offersthree operation modes: Quasi-Resonant, Multi-Bottom Skip and Time Fix Control, thus guaranteeing high efficiencyin all loading areas by means of the automatic change-over of the operation modes.  QR—- Quasi-Resonant operation at the time of heavy load  MBS—- Multi-Bottom Skip operation at the time of medium load for preventing oscillating frequency rising up and fixing operating frequency  TFC—- Time Fix Control at the time of light load such as stand-by load By adopting chip-on-chip construction, even small package can deal with big power.

Ordering Informations :

STR-W6853 data

STR-W6853 datasheet


1. Seven-pin small SIP style package FM207 (generally called TO220), affording dielectric

2. Guarantees space of 1.8mm between high voltage pin and other pins, thus high voltage
MOSFET built-in allowed

3. Offers low startup current by employing BCD-Process

4. Automatic change-over of QR and MBS operations
With MOSFET turn-on at the bottom of VDS, “STR-W 6800 Series ICs” offers high efficiency
and low noise at the wide areas from the heavy load to stand-by load and fixed operating frequency, and enables SMPS to become smaller.

5. TFC operation delivers low-power standby mode for fixing turn-on time, enabling external
components to adjust turn-on time.

Other data sheets within the file : STR-W6851, STR-W6852, STRW6853, STR-W6854, STR-W6856

STR-W6853 Datasheet PDF

STR-W6853 datasheet pdf