KA7552A
Features
- Built-in drive circuits for direct connection power MOSFET (l O = ±1.5A)
- Wide operating frequency range (5k Hz ~ 600k Hz)
- Pulse by pulse over current limiting
- Over load protection
- On/off control by external trigger
- Internal UVLO
- Low standby current (typ. 90u A)
- 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
Internal Block Diagram
CS + _
+ 0.56 ~ 0.42V
CT 7
RT 1
10u A
VCC 6
7V
UVLO BIAS (4V)
OFF 3.6V
2.8V 4.3K
+
- 2.4V 1.9V
+
- 5
PWM OUTPUT
0.24V
R _ +
O.C.P
2 FB
3 IS(+)
4 GND
Rev. 1.0.2
©2004...
