MP62055EJ-LF-P 데이터 시트보기 (PDF) - Monolithic Power Systems

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MP62055EJ-LF-P

3.3V/5V, Single-Channel 500mA Current-Limited Power Distribution Switch

Monolithic Power Systems 

MP62055 –CURRENT-LIMITED POWER DISTRIBUTION SWITCHE

FUNCTION BLOCK DIAGRAM

IN

----

EN ----

UVLO

Charge

Pump

-- -- --

Logic

Current

Sense

--

AMP

+

Deglitch

+

Vref

--

----

OUT

-- FLAG

Thermal

Sense

----

GND

Figure 2—Functional Block Diagram

DETAILED DESCRIPTION

Over Current

When the load exceeds trip current (minimum

threshold current triggering constant-current

mode) or a short is present, MP62055 switches

into to a constant-current mode (current limit

value). MP62055 will be shutdown only if the

overcurrent condition stays long enough to

trigger thermal protection.

Trigger overcurrent protection for different

overload conditions occurring in applications:

1) The output has been shorted or overloaded

before the device is enabled or input applied.

MP62055 detects the short or overload and

immediately switches into a constant-current

mode.

2) A short or an overload occurs after the device

is enabled. After the current-limit circuit has

been tripped (reached the trip current

threshold), the device switches into constant-

current mode. However, high current may

flow for a short period of time before the

current-limit circuit can react.

3) Output current has been gradually increased

beyond the recommended operating current.

The load current rises until the trip current

threshold is reached or until the thermal limit

of the device is exceeded. The MP62055 is

capable of delivering current up to the trip

current threshold without damaging the

device. Once the trip threshold has been

reached, the device switches into its

constant-current mode.

Flag Response

The FLAG pin is an open drain configuration.

This FAULT will report a fail mode after an 8ms

deglitch timeout. This is used to ensure that no

false fault signals are reported. This internal

deglitch circuit eliminates the need for extend

components. The FLAG pin is not deglitched

during an over temp. or a voltage lockout.

MP62055 Rev.1.0

www.MonolithicPower.com

7

4/19/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2010 MPS. All Rights Reserved.

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