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RT9232BGS

Programmable Frequency Synchronous Buck PWM Controller

Richtek Technology 

RT9232B

To prevent OC form tripping in normal operation, ROCSET

must be carefully chosen with :

1. Maximum RDS(ON) at highest junction temperature

2. MInimum IOCSET from specification table

3. IL(MAX) > IOUT(MAX) + Δ IL /2

Δ IL = inductor ripple current

Under Voltage Protection

The under voltage protection function protects the converter

from an shorted output by detecting the voltage on FB pin

to monitor the output voltage. The UVP function cycles

soft-start function in a hiccup mode. When output voltage

lower than 75% of designated voltage, UVP function

initializes soft-start cycles. The soft-start function

discharges Css with 10μA current sink and disable PWM

operation. Then soft-start function recharges Css and

PWM operation resumes. The soft-start hiccup restarts

after SS voltage fully charges to 4V if the output short

event still remains. The converter is shutdown permanently

after 3 times hiccup and only restarting supply voltages

can enable the converter.

www.richtek.com

4

DS9232B-03 March 2007

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