HV301 データシートの表示（PDF） - Supertex Inc
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HV301 Datasheet PDF : 21 Pages
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Application Information, cont’d.
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
HV301/HV311
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 VDD pins, full reverse
polarity protection on either power source is also provided
(Application Circuit 13).
GND
R1
487kΩ
PS1
R2
6.81kΩ
R3
9.76kΩ
D2
8
VDD
3 UV
2 OV
PWRGD 1
HV301/
HV311
RAMP VEE SENSE GATE
7
4
5
6
-48V
C1
10nF
R4
60mΩ
D1
Q1
IRF530
GND
D2
8
VDD
R1
487kΩ
3 UV
R2
PS2 6.81kΩ
2 OV
R3
9.76kΩ
PWRGD 1
HV301/
HV311
RAMP VEE SENSE GATE
7
4
5
6
-48V
C1
10nF
R4
60mΩ
D1
Q1
IRF530
ENABLE / ENABLE +5V
Cload
DC/DC
PWM
COM
CONVERTER
Note: capacitor may be needed to slow PWRGD dv/dt if
oscillations are observed when VIN is close to OV.
17
Application Circuit 13
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