?
Understanding Intersil Hot Plug Devices
Technical Brief
April 18, 2006
TB457.0
Authors: Eric Josefson and Sean Barr
Overview
Hot Plug controllers have two primary responsibilities,
control inrush currents during turn-on and control load
currents to a safe pre-determined level in the event of a high
current fault/short during static operation.
Devices Under Observation
? ISL6116 (+5V)
? ISL6116 (-12V)
? ISL6116 (-48V)
? ISL6115 (+12V)
? HIP1012A (+5V and +3.3V)
? ISL6173 (+3.3V and +2.5V)
? ISL6111(+12V, -12V, +3.3V, +5V)
? ISL6118 (+5V x2)
? Setting the Overcurrent Trip Point
C TIM DISCHARGED
R ISET IS USED TO SET THE
DEVICE’S OVERCURRENT
THRESHOLD POINT*
I S V SENSE > V SET ?
NO
YES
CURRENT THROUGH R ISENSE
GENERATES A VOLTAGE TO BE
COMPARED TO THRESHOLD
POINT DEFINED BY R ISET
C TIM CHARGED
HAS TIMEOUT
OCCURRED?**
YES
FAULT CONDITION
*See respective controller datasheet for equations to select R ISET
**Timeout is proportional to CTIM and varies by controller
(see datasheets)
OVERCURRENT TRIP POINT OPERATION
NO
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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