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KA7552A

Fairchild
Part Number KA7552A
Manufacturer Fairchild
Description SMPS Controller
Published Apr 25, 2005
Detailed Description www.fairchildsemi.com KA7552A/KA7553A SMPS Controller Features • Built-in drive circuits for direct connection power MO...
Datasheet PDF File KA7552A PDF File

KA7552A
KA7552A

Overview
www.
fairchildsemi.
com KA7552A/KA7553A SMPS Controller Features • Built-in drive circuits for direct connection power MOSFET (lO = ±1.
5A) • Wide operating frequency range (5kHz ~ 600kHz) • Pulse by pulse over current limiting • Over load protection • On/off control by external trigger • Internal UVLO • Low standby current (typ.
90uA) • Soft start circuit Description The KA7552A/KA7553A are switching power control IC for wide operating frequency range.
The internal circuits include pulse by pulse current limiting, protection, on/off control by external trigger, low standby current, soft start, and high current totempole output for driving a POWER MOSFET.
Maximum duty of the KA7552A is 70% and the KA7553A is 46%.
When duty is maximum, the input threshold voltage of pin2 & pin8 are not same in KA7552A and KA7553A.
8-DIP 1 Internal Block Diagram CS + _ + 0.
56 ~ 0.
42V CT 7 RT 1 10uA VCC 6 8 OSC 7V UVLO BIAS (4V) OFF 3.
6V 2.
8V 4.
3K + - 2.
4V 1.
9V + - 5 PWM OUTPUT 0.
24V R _ + O...


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