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HV311LG Datasheet(PDF) 17 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) 17 Page - Supertex, Inc

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17
HV301/HV311
Redundant Supplies
Many systems use redundant primary power supplies or battery
backup. When redundant AC powered sources are used they are
generally diode OR’ed to the load on the hot terminal.
For these systems, the use of independent hotswap controllers
is recommended with the diode OR’ing provided after the hotswap
Application Information, cont’d.
controllers. The HV311 is ideally suited for such applications
since two or more active low PWRGD signals can be connected
to a single active low ENABLE pin, thus enabling the load as long
as at least one primary power source is available. By adding low
current 100V diodes in series with the V
DD pins, full reverse
polarity protection on either power source is also provided
(Application Circuit 13).
Application Circuit 13
VDD
UV
OV
VEE
SENSE GATE
RAMP
-48V
Cload
+5V
8
3
2
COM
1
GND
VDD
UV
OV
VEE
SENSE GATE
RAMP
-48V
R4
60m
Ω
R1
487k
Ω
R2
6.81k
Ω
R3
9.76k
Ω
Q1
IRF530
8
3
2
5
74
1
GND
C1
10nF
D1
D1
D2
D2
PS1
PS2
HV301/
HV311
HV301/
HV311
PWRGD
6
PWRGD
R1
487k
Ω
R2
6.81k
Ω
R3
9.76k
Ω
5
74
6
R4
60m
Ω
Q1
IRF530
C1
10nF
DC/DC
PWM
CONVERTER
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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