HV301 SUTEX [Supertex, Inc], HV301 Datasheet - Page 7

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

Design Information, cont’d.
Method 2: Inrush = 1/2 I
1.
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
Programming Inrush and I
2. Inrush =
3.
necessary to reduce peaking.
Choose I
Add compensation components from gate to drain if
CB
R
50mv
SENSE
=
R
100mV
SENSE
, e.g.
CB
,
(Servo Mode)
e.g. 2A
50mV
50m
Ω
= 1A
⇒
CB
R
, continued:
SENSE
Capacitor and/or
compensation resistor
will reduce peaking
= 50m
Ω
7
PWRGD
Timing (Servo Mode)
V
V
V
V
The timing functions are defined by the following equations:
OUT
inactive
t
t
t
t
t
t
RAMP
GATE
active
START
TH
POR
RISE
LIMIT
PWRGD
IN
I
IN
GND
V
-48V
EE
=
=
≈
V
≈
=
t
GS th
g
=
START
V
2 4
fs
( )
(
IN
.
V



contact
bounce
INT
0 9
C
C
I
I
C
Initialization
I
.
+
LIMIT
RAMP
I
RAMP
LOAD
RAMP
RAMP
RAMP
I
t
−
TH
LIMIT
C
V
RAMP
GS
(
t
LIMIT
V
t
−
RISE
POR
UVL
t
R
TH
t
SENSE
R
)
START
FB
−
1 2
V
V
IN
.
90%
GS(th)



V
t
)
LIM
RAMP
V
Limiting
C
I
OUT
V
RAMP
RAMP
GATE
V
I
LIM
GS(lim)
t
PWRGD
Full On
HV301/HV311
V
GATE