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HV311LG Datasheet(PDF) 16 Page - Supertex, Inc

Part # HV311LG
Description  Hotswap, Controllers with Circuit Breaker
PDF  21 Pages
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Manufacturer  SUTEX [Supertex, Inc]
Direct Link  http://www.supertex.com
Logo SUTEX - Supertex, Inc

HV311LG Datasheet(HTML) 16 Page - Supertex, Inc

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16
HV301/HV311
Reverse Polarity Protection
The UV and OV pins are protected against reverse polarity input
supplies by internal clamping diodes and the fault currents are
sufficiently limited by the impedance of the external resistor
divider, however, a low current diode with a 100V breakdown
rating must be inserted in series with the V
DD pin.
Application Information, cont’d.
This method (shown in Application Circuit 12) will protect the
hotswap control circuit however, due to the intrinsic diode in the
external MOSFET, the load will not be protected from reverse
polarity voltages.
Application Circuit 12
VDD
UV
OV
VEE
SENSE GATE
RAMP
-48V
R4
12.5m
Ω
R1
487k
Ω
R2
6.81k
Ω
R3
9.76k
Ω
Q1
IRF530
Cload
+5V
HV311
8
3
2
5
74
COM
1
GND
C1
10nF
D1
6
DC/DC
PWM
CONVERTER
PWRGD / PWRGD
ENABLE / ENABLE
Note: capacitor may be needed to slow PWRGD dv/dt if
oscillations are observed when V
IN is close to OV.



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