HV300LG-G datasheet(4/7 Pages) SUTEX

Part #	HV300LG-G

Description	Hotswap, Inrush Current Limiter Controllers (Negative Supply Rail)

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Manufacturer	SUTEX [Supertex, Inc]

Direct Link	http://www.supertex.com

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4

HV300

● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com

Timing Diagram

GND

-48V

VIN

IIN

tSTART

contact

bounce

ILIM

PWRGD

VUVL

tRISE

tPWRGD

VGATE

Initialization

Limiting

Full On

VGATE

VOUT

tLIM

tTH

VRAMP

V

RAMP

V

GATE

inactive

active

V

OUT

V

IN

VGS(th)

VGS(lim)

VEE

tPOR

Functional Block Diagram

LOGIC

V

INT

VDD

UV

OV

VEE

SENSE

GATE

RAMP

V

REF

UVLO

and

POR

Band Gap

Reference

Internal

Supply

Regulator

V

INT

5kΩ

V

INT - 1.2V

Switch

V

REF

2V

REF

Transconductor

Buffer

PWRGD

+

-

10mA

C

A

C

Automatic

Restart

Delay

Circuit

Breaker

100mV

Note:

V

INT is the internally regulated supply voltage and can range from 9.0 to 11V.

V

GS(th) is the gate threshold voltage of the external pass transistor and may be obtained from its datasheet.

V

GS(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.

g

fs is the transconductance of the pass transistor and may be obtained from its datasheet.

R

FB is the internal feedback resistor and is 5.0kΩ nominal.

1.

2.

3.

4.

5.

I

LIM =

V

SENSE

R

SENSE

t

START = 12V

C

RAMP

I

RAMP

t

TH = VGS(th)

C

RAMP

I

RAMP

t

POR = tSTART + tTH

t

RISE ≈

C

RAMP

g

fs

I

RAMP

-

R

SENSE

0.9I

LIM

R

FB

t

LIM ≈ VIN

C

LOAD -

1

t

RISE

I

LIM

2

t

PWRGD = (VINT - VGS(LIM) - 1.2V)

C

RAMP

I

RAMP

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