HV300 データシートの表示（PDF） - Supertex Inc

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HV300

Hotswap, Inrush Current Limiter Controllers (Negative Supply Rail)

Supertex Inc 

HV300/HV310

Timing Diagrams

GND

VIN

VOUT

-48V

VRAMP

VGATE

VEE

IIN

contact

bounce

VUVL

VOUT

VIN

tSTART

VRAMP

VGS(th)VGATE

VGS(lim)

tTH

tPOR

90%

ILIM

active

PWRGD

inactive

tRISE

tLIM

tPWRGD

Initialization

Limiting

Full On

VGATE

I LIM

=

VSENSE

RSENSE

tSTART

= 1.2V

CRAMP

I RAMP

tTH

=

VGS(th)

CRAMP

I RAMP

tPOR = tSTART + tTH

t RISE

≈

CRAMP

g

fs





I RAMP

0.9 I LIM

−

RSENSE

RFB





t LIM

≈

VIN

CLOAD

I LIM

−

1

2 tRISE

( ) tPWRGD =

VINT − VGS(lim) − 1.2V

CRAMP

I RAMP

VINT is the internally regulated supply voltage and can

range from 9V to 11V.

VGS(th) is the gate threshold voltage of the external pass

transistor and may be obtained from its datasheet.

VGS(lim) is the pass transistor gate-source voltage required

to obtain the limit curent. It is dependent on the pass

transistor’s characteristics and may be obtained from the

transfer characteristics curves on the transistor datasheet.

gfs is the transconductance of the pass transistor and may

be obtained from its datasheet.

RFB is the internal feedback resistor and is 5kΩ nominal.

Absolute Maximum Ratings

VEE reference to VDD pin

+0.3V to -100V

VPWRGD referenced to VEE Voltage

-0.3V to +100V

Operating Ambient Temperature Range -40°C to +85°C

Operating Junction Temperature

Range

-40°C to +125°C

Storage Temperature Range

-65°C to +150°C

UV & OV ref to VEE

-0.3V to +12V

3

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