HV311LG Ver la hoja de datos (PDF) - Supertex Inc
Número de pieza
componentes Descripción
Fabricante
HV311LG Datasheet PDF : 21 Pages
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Design Information, cont’d.
Programming Inrush and ICB, continued:
Method 2: Inrush = 1/2 ICB (Servo Mode)
1.
Choose
ICB
=
100mV
R SENSE
,
e.g. 2A
⇒
RSENSE = 50mΩ
2. Inrush = 50mv , e.g. 50mV = 1A
RSENSE
50mΩ
3. Add compensation components from gate to drain if
necessary to reduce peaking.
Capacitor and/or
compensation resistor
will reduce peaking
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
HV301/HV311
Timing (Servo Mode)
GND
VIN
VOUT
-48V
VRAMP
VGATE
VEE
IIN
contact
bounce
VUVL
VOUT
VIN
tSTART
VRAMP
VGS(th)VGATE
VGS(lim)
tTH
tPOR
90%
ILIM
VGATE
active
PWRGD
inactive
tRISE
tLIM
tPWRGD
Initialization
Limiting
Full On
The timing functions are defined by the following equations:
tSTART
= 2.4 CRAMP
I RAMP
tTH
=
VGS(th)
CRAMP
I RAMP
tPOR = tSTART + tTH
t RISE
≈
CRAMP
g
fs
I RAMP
0.9 I LIMIT
−
RSENSE
RFB
t LIMIT
≈
VIN
CLOAD
I LIMIT
( ) tPWRGD =
VINT − VGS(LIMIT) − 1.2
CRAMP
I RAMP
7
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