Diodes AP2145/ AP2155 Uživatelský manuál stáhnout pdf (Strana 10)

AP2145/ AP2155

Document number: DS32031 Rev. 3 - 2

10 of 13

www.diodes.com

March 2013

AP2145/ AP2155

Application Information (cont.)

Under-Voltage Lockout (UVLO)

Under-voltage lockout function (UVLO) keeps the internal power switch from being turned on until the power supply has reached at least 1.9V, even

if the switch is enabled. Whenever the input voltage falls below approximately 1.9V, the power switch is quickly turned off. This facilitates the design

of hot-insertion systems where it is not possible to turn off the power switch before input power is removed.

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 AP2145/AP2155, 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 AP2145/AP2155 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 AP2145/AP2155 between the V

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.

Ordering Information



AP 21

XG-1

4 : Active Low

5 : Active High

G : Green 13 : Tape & Reel5 : 1 Channel

Channel

Green

PackageEnable

Packing

S : SO-8

MP : MSOP-8EP

Part Number Package Code Packaging

13” Tape and Reel

Quantity Part Number Suffix

AP21X5SG-13 S SO-8 2500/Tape & Reel -13

AP21X5MPG-13 MP MSOP-8EP 2500/Tape & Reel -13

Marking Information

(1) SO-8

AP21X

( Top view )

YY WW X X

Part Number

Logo

: Week : 01~52; 52

: Year : 08, 09,10~

G : Green

: Internal Code

8765

4 : Active Low

5 : Active High

5 : 1 Channel

represents 52 and 53 week

1 2 ... 5 6 7 8 9 10 11 12 13

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