Sharp LC-32X20E Service Manual page 112

LC-32X20E/S/RU, LC-37X20E/S/RU
2.21. IC9602 (VHiMP2367DN-1Y)
2.21.1 Block Diagram
2.21.2 Pin Connections and short description
Pin No. Pin Name I/O
1 BS
2 IN
3 SW
4 GND
5 FB
6 COMP
7 EN
8 SS
I High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET switch.
Connect a 0.01µF or greater capacitor from SW to BS to power the high side switch.
I Power Input. IN supplies the power to the IC, as well as the step-down converter switches.
Drive IN with a 4.45V to 28V power source. Bypass IN to GND with a suitably large capacitor to eliminate noise
on the input to the IC.
Ground.
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a resistive voltage divider
from the output voltage. The feedback reference voltage is 0.8V.
Compensation Node. COMP is used to compensate the regulation control loop. Connect a series RC network
from COMP to GND to compensate the regulation control loop. In same cases, an additional capacitor from
COMP to GND is required.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator, drive
it low to turn it off.
Soft-start Control Input. SS controls the soft-start period. Connect a capacitor from SS to GND to set the soft-
start period.
Pin Function
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