HV311 datasheet(3/21 Pages) SUTEX

Part #	HV311

Description	Hotswap, Controllers with Circuit Breaker

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Manufacturer	SUTEX [Supertex, Inc]

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3

HV301/HV311

Absolute Maximum Ratings

V

EE reference to VDD pin

+0.3V to -100V

V

PWRGD referenced to VEE Voltage

-0.3V to +100V

V

UV and VOV referenced to VEE Voltage

-0.3V to +12V

Operating Ambient Temperature

-40°C to +85°C

Operating Junction Temperature

-40°C to +125°C

Storage Temperature Range

-65°C to +150°C

Pin Description

PWRGD – The Power Good Output Pin is held inactive on initial

power application and will go active when the external MOSFET

is fully turned on. This pin may be used as an enable control

when connected directly to a PWM power module.

OV – This OverVoltage (OV) sense pin, when raised above its

high threshold will immediately cause the GATE pin to be pulled

low. The GATE pin will remain low until the voltage on this pin falls

below the low threshold limit, initiating a new start-up cycle.

UV – This UnderVoltage (UV) sense pin, when below its low

threshold limit will immediately cause the GATE pin to be pulled

low. The GATE pin will remain low until the voltage on this pin

rises above the high threshold limit, initiating a new start-up

cycle.

V

EE – This pin is the negative terminal of the power supply input

to the circuit.

V

DD – This pin is the positive terminal of the power supply input

to the circuit.

RAMP – This pin provides a current output so that a timing ramp

voltage is generated when a capacitor is connected.

GATE – This is the Gate Driver Output for the external N-

Channel MOSFET.

SENSE – The current sense resistor connected from this pin to

V

EE Pin programs the circuit breaker trip limit.

General Description, cont’d.

PWRGD Logic

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inactive state. Thereafter a programmable auto-retry timer will

hold the device off to allow the pass element to cool before

resetting and restarting. The auto-retry can be disabled using a

single resistor if desired.

The HV301/HV311 includes a current mode servo-circuit which

can be used as a return to limit during input voltage steps such

as would be seen in a diode “ORed” situation when power

switches back to regulated supply from battery operation. The

HV301/HV311 allow independent programming of the trigger

level of this phenomenon so that it may be set at a different level

to the current limit level if desired. Under all circumstances the

maximum servo period is limited to 100ms to protect the pass

element.

Pinout

PWRGD (HV301)

PWRGD (HV311)

OV

UV

VEE

VDD

RAMP

GATE

SENSE

1

2

3

4

8

7

6

5

Ordering Information

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5.00ms/div

Waveforms

Drain

50V/div

V

IN

50V/div

Gate

5.00V/div

I

inrush

500mA/div

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