HV301 SUTEX [Supertex, Inc], HV301 Datasheet - Page 18

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

Application Information, cont’d.
Use with Negative Ground
Either the HV301 or HV311 may be used with any negative
ground systems where DC/DC PWM Converters have isolated
outputs and their inputs need not be ground referenced
(Application Circuit 14).
Note: capacitor may be needed to slow PWRGD dv/dt if
oscillations are observed when V
+48V
6.81kΩ
9.76kΩ
GND
487kΩ
R1
R2
R3
10nF
IN
3
2
C1
is close to OV.
UV
OV
RAMP
V DD
8
7
V EE
4
12.5mΩ
HV301/
HV311
PWRGD / PWRGD
R4
SENSE GATE
5
6
IRF530
Q1
18
1
Current Limit Stability (Method 2 (Servo) Only)
The closed loop current mode control system used in the HV301/
HV311 is very stable, especially when driving MOSFETs with
high gate capacitances (C
the end of the current limit may be noted with some MOSFETs.
The current control loop can be frequency compensated to
eliminate this peaking by adding a series connected capacitor
and resistor between the gate and source of the external MOSFET.
The recommended starting values for C and R are 10nF and 1K.
These compensation values should be verified by board level
testing, which may yield satisfactory results with reduced com-
ponent values.
Cload
ENABLE/ ENABLE
DC/DC PWM CONVERTER
ISS
). However, a peaking in I
Application Circuit 14
+5V
COM
HV301/HV311
LIMIT
near