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RT9232BGS датащи(PDF) 4 Page - Richtek Technology Corporation

номер детали RT9232BGS
подробное описание детали  Programmable Frequency Synchronous Buck PWM Controller
PDF  14 Pages
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производитель  RICHTEK [Richtek Technology Corporation]
домашняя страница  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9232BGS датащи(HTML) 4 Page - Richtek Technology Corporation

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RT9232B
4
DS9232B-03
March 2007
www.richtek.com
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 I
L = 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 10
μA 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.



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