AP2191FMG-7 Diodes Zetex, AP2191FMG-7 Datasheet - Page 12

• Manufacturer Part Number: AP2191FMG-7
• Manufacturer: Diodes Zetex

Specifications of AP2191FMG-7

• Lead Free Status / Rohs Status: Compliant

AP2181/AP2191
1.5A 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
AP2181/AP2191, 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 AP2181/AP2191 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 AP2181/AP2191 between the V
input and the rest of the circuitry, the input power reaches
CC
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.
AP2181/AP2191 Rev. 6
12 of 18
JUNE 2009
DS31563
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