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HV311LG Datasheet(PDF) 7 Page - Supertex, Inc

Part # HV311LG
Description  Hotswap, Controllers with Circuit Breaker
PDF  21 Pages
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Manufacturer  SUTEX [Supertex, Inc]
Direct Link  http://www.supertex.com
Logo SUTEX - Supertex, Inc

HV311LG Datasheet(HTML) 7 Page - Supertex, Inc

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7
HV301/HV311
The timing functions are defined by the following equations:
t
C
I
tV
C
I
tt
t
t
C
g
I
I
R
R
tV
C
I
tV
V
C
I
START
RAMP
RAMP
TH
GS th
RAMP
RAMP
POR
START
TH
RISE
RAMP
fs
RAMP
LIMIT
SENSE
FB
LIMIT
IN
LOAD
LIMIT
PWRGD
INT
GS
RAMP
RAMP
=
=
=+
≈
−
≈
=
−−
()
24
09
12
.
.
.
()
()
LIMIT
Timing (Servo Mode)
Design Information, cont’d.
Programming Inrush and I
CB, continued:
Method 2: Inrush = 1/2 I
CB (Servo Mode)
i)
start with 2nF from gate to source
ii) increase to 10nF if needed
iii) add 1k series resistor from gate to capacitor if needed
Capacitor and/or
compensation resistor
will reduce peaking
GND
-48V
VIN
IIN
t
START
contact
bounce
I
LIM
PWRGD
V
UVL
t
RISE
t
PWRGD
VGATE
Initialization
Limiting
Full On
V
GATE
VOUT
t
LIM
t
TH
VRAMP
V
RAMP
V
GATE
inactive
active
V
OUT
V
IN
V
GS(th)
V
GS(lim)
V
EE
t
POR
90%
1.
Choose I
=
100mV
R
e.g. 2A
R
= 50m
2.
Inrush =
50mv
R
, e.g.
50mV
50m
=1A
3.
Add compensation components from gate to drain if
necessary to reduce peaking.
CB
SENSE
SENSE
SENSE
,
⇒Ω
Ω



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