HV311LG Ver la hoja de datos (PDF) - Supertex Inc

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HV311LG

Hot Swap Controller (Negative Supply Rail)

Supertex Inc 

Hot Swap Controller

(Negative Supply Rail)

HV301/HV311

HV301/HV311

Features

Ordering Information

❑ ±10V to ±90V Operation

❑ Built-in “normally on” turn-on clamp eliminates components

❑ UV/OV Lock Out & Power-on-Reset for Debouncing

Active State of Package Options

Power Good Signal

8 Pin SO

❑ Sense resistor program ground circuit breaker

❑ Programmable circuit breaker holdoff

❑ Inrush control using either: i) servo or ii) feedback cap

❑ Feedback to Ramp pin means no Gate clamp needed

❑ Application solution for input voltage step (diode “ORing”)

General Description ❑ Programmable Auto-Retry (tens of seconds if desired)

ANpplicoationts Recommended ❑ Auto-RetryorLatchedOperation

❑ Enable through Open Drain interface to UV or OV

❑ Low Power, <0.6mA PWRGD Flag Operation, <0.4mA

Sleep Mode

❑ Small SOIC-8 Package

Designs! ❑ -48VCentralOfficeSwitching

❑ -24V Cellular and Fixed Wireless Systems

❑ -24V PBX Systems

❑ Line Cards

❑ -48V Powered Ethernet for VoIP

❑ Distributed Power Systems

❑ Power Supply Control

❑ +48V Storage Networks

Typical AFpplicoationrCircNuit ew ❑ Electronic Circuit Breaker

HIGH

LOW

HV301LG

HV311LG

The Supertex HV301 and HV311 Hot Swap Controllers provide

control of power supply connection during insertion of cards or

modules into live backplanes. They may be used in systems

where active control is implemented in the negative lead of

supplies ranging from ±10V to ±90V.

During initial power application the gate of the external pass

device is clamped low to suppress contact bounce glitches by a

“normally on” circuit which does not require initialization of the

IC. Thereafter the UV/OV supervisors and power-on-reset work

together to suppress gate turn on until mechanical bounce has

ended. The HV301/311 then control the current inrush limit to a

programmed level using one of two possible methods, i) servo

control or ii) a drain to ramp capacitor. The above methods

eliminate the need for extra hold-off or current limiting compo-

nents. The devices also include an electronic circuit breaker,

programmed by a sense resistor.

After the load capacitance has fully charged, the HV301/311 will

transition into a low power mode, and enable the open drain

PWRGD. In low power mode the HV301/311 continues to moni-

tor the input voltage and monitor the current level. If a load fault

occurs, the electronic circuit breaker will trip, the pass

element will be turned off, and the PWRGD will return to an

GND

R1

487kΩ

R2

6.81kΩ

R3

9.76kΩ

8

VDD

3 UV

2 OV

PWRGD / PWRGD

1

HV301/

HV311

ENABLE / ENABLE

Cload

DC/DC

PWM

CONVERTER

+5V

COM

Waveforms

Drain

50V/div

(continued on Page 3)

VEE

4

SENSE

5

GATE

6

RAMP

7 C2

0.85nF

VIN

50V/div

-48V

R4

12.5mΩ

C1

10nF

Q1

IRF530

-48V

NOTES: 1. Undervoltage Shutdown (UV) set to 35V.

2. Overvoltage Shutdown (OV) set to 65V.

3. Current Limit set to ~1A.

4. CB set to 8A.

Gate

5.00V/div

Iinrush

500mA/div

5.00ms/div

A092605

A092605

1

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