HV301 SUTEX [Supertex, Inc], HV301 Datasheet - Page 17

• Manufacturer Part Number: HV301
• Description: Hotswap, Controllers with Circuit Breaker
• Manufacturer: SUTEX [Supertex, Inc]

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
Note: capacitor may be needed to slow PWRGD dv/dt if
oscillations are observed when V
PS1
PS2
IN
is close to OV.
GND
6.81kΩ
9.76kΩ
6.81kΩ
9.76kΩ
-48V
GND
487kΩ
-48V
487kΩ
R1
R2
R3
R1
R2
R3
3
2
3
2
UV
OV
UV
OV
RAMP
RAMP
V DD
V DD
8
8
7
7
D2
D2
C1
10nF
C1
10nF
V EE
V EE
4
4
60mΩ
HV301/
HV311
HV301/
HV311
60mΩ
R4
R4
17
SENSE GATE
SENSE GATE
5
5
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
polarity protection on either power source is also provided
(Application Circuit 13).
PWRGD
PWRGD
6
6
IRF530
IRF530
Q1
Q1
1
1
D1
D1
Cload
ENABLE / ENABLE
CONVERTER
Application Circuit 13
DC/DC
PWM
+5V
COM
DD
pins, full reverse
HV301/HV311