AP2141 View Datasheet(PDF) - Diodes Incorporated.

Part Name

Description

Manufacturer

AP2141

0.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH

Diodes Incorporated. 

AP2141/AP2151

0.5A SINGLE CHANNEL CURRENT-LIMITED POWER

SWITCH

Application Note (Continued)

Generic Hot-Plug Applications

In many applications it may be necessary to remove modules or pc boards while the main unit is still

operating. These are considered hot-plug applications. Such implementations require the control of current

surges seen by the main power supply and the card being inserted. The most effective way to control these

surges is to limit and slowly ramp the current and voltage being applied to the card, similar to the way in

which a power supply normally turns on. Due to the controlled rise times and fall times of the

AP2141/AP2151, these devices can be used to provide a softer start-up to devices being hot-plugged into a

powered system. The UVLO feature of the AP2141/AP2151 also ensures that the switch is off after the card

has been removed, and that the switch is off during the next insertion.

By placing the AP2141/AP2151 between the VCC input and the rest of the circuitry, the input power reaches

these devices first after insertion. The typical rise time of the switch is approximately 1ms, providing a slow

voltage ramp at the output of the device. This implementation controls system surge current and provides a

hot-plugging mechanism for any device.

AP2141/AP2151 Rev. 6

DS31562

13 of 19

www.diodes.com

JUNE 2009

© Diodes Incorporated

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