參數(shù)資料
型號: HV301
廠商: Supertex, Inc.
英文描述: Hotswap, Controllers with Circuit Breaker
中文描述: 熱插拔控制器與斷路器
文件頁數(shù): 18/21頁
文件大小: 664K
代理商: HV301
18
HV301/HV311
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
).
Application Circuit 14
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
). However, a peaking in I
near
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.
VDD
UV
OV
VEE
4
SENSE GATE
RAMP
+48V
Cload
+5V
HV301/
HV311
8
3
2
COM
1
GND
R4
12.5m
R1
487k
R2
6.81k
R3
9.76k
Q1
IRF530
C1
10nF
DC/DC PWM CONVERTER
PWRGD / PWRGD
ENABLE/ ENABLE
5
7
6
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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