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HV311LG Datasheet(PDF) 13 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) 13 Page - Supertex, Inc

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13
HV301/HV311
Application Information, cont’d.
Application Circuit 7
Using Short Connector Pin
In some systems short connector pins are used to guarantee that
the power pins are fully mated before the hotswap control circuit
is enabled. For these systems the positive (V
DD) end of the R1,
R2, and R3 resistor divider should be connected to the short pin
(Application Circuit 7).
Unfortunately this will also cause some delay in responding to
UV conditions. If this UV delay is not acceptable, then separate
resistor dividers can be provided for OV and UV with a capacitor
connected from OV pin to the V
EE pin (Application Circuit 6).
Application Circuit 6
VDD
UV
OV
VEE
SENSE GATE
RAMP
-48V
R5
12.5m
Ω
R1
475k
Ω
R2
16.2k
Ω
R3
511k
Ω
Q1
IRF530
Cload
+5V
HV311
8
3
2
5
74
COM
1
GND
C1
10nF
C2
R4
10k
Ω
DC/DC
PWM
CONVERTER
PWRGD / PWRGD
ENABLE / ENABLE
6
Note: capacitor may be needed to slow PWRGD dv/dt if
oscillations are observed when V
IN is close to OV.
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
HV301/
HV311
8
3
2
5
74
COM
1
GND
C1
10nF
Long
Pin
Short
Pin
Long
Pin
GND
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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