HV301 SUTEX [Supertex, Inc], HV301 Datasheet - Page 11

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

Application Information, cont’d.
However, if the DC/DC PWM Converter with the ENABLE input
circuit configuration was active HIGH, then the apparent choice
of the HV301 would result in the creation of a current path
through the protective diode clamp of the ENABLE input and the
PWRGD output MOSFET of the HV301. For this situation the
HV311 should be used as shown below in Application Circuit 2.
Note: capacitor may be needed to slow PWRGD dv/dt if
oscillations are observed when V
Note: capacitor may be needed to slow PWRGD dv/dt if
oscillations are observed when V
6.81kΩ
9.76kΩ
487kΩ
GND
-48V
6.81kΩ
9.76kΩ
GND
487kΩ
-48V
R1
R2
R3
R1
R2
R3
IN
IN
10nF
is close to OV.
is close to OV.
3
2
C1
10nF
UV
OV
RAMP
3
2
C1
V DD
8
7
UV
OV
RAMP
8
V DD
7
V EE
HV311
4
12.5mΩ
V EE
4
R4
12.5mΩ
HV311
SENSE
R4
5
SENSE GATE
5
PWRGD
GATE
6
PWRGD
IRF530
11
Q1
6
IRF530
Q1
1
In some applications the PWRGD signal is used to activate load
circuitry on the isolated output side of the DC/DC PWM Con-
verter. In this situation an optocoupler is needed to provide the
required isolation as shown below in Application Circuit 3.
1
Cload
Cload
+
-
ENABLE
CONVERTER
DC/DC
PWM
Optocoupler
ENABLE
CONVERTER
DC/DC
PWM
+5V
COM
Application Circuit 2
Application Circuit 3
Rload
COM
+5V
HV301/HV311