MP2488 データシートの表示（PDF） - Monolithic Power Systems

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MP2488

200kHz, 55V Input, 2A High Power LED Driver

Monolithic Power Systems 

MP2488 – 2A, 200kHz, 55V HIGH-POWER LEDS DRIVER

PIN FUNCTIONS

QFN

Pin #

1, 2

3

4

5

6

7

8, 9

10

SOIC8

Pin #

1

2

3

4

5

6

7

8

Name Description

Switch Node. This is the output from the high-side switch. A low VF Schottky rectifier

SW to ground is required. The rectifier must be close to the SW pins to reduce switching

spikes.

EN

Enable Input. Pulling this pin below the specified threshold shuts the chip down.

Pulling it up above the specified threshold or leaving it floating enables the chip.

COMP

Compensation. This node is the output of the GM error amplifier. Control loop

frequency compensation is applied to this pin.

Feedback. This is the input to the error amplifier. An external current sensing resistor

FB

is connected in series with the LEDs to GND. The feedback voltage is connected to

this pin and is compared to the internal +200mV reference to set the regulation

current.

GND, Ground. It should be connected as close as possible to the output capacitor avoiding

Exposed the high current switch paths. Connect exposed pad to GND plane for optimal thermal

pad performance.

FREQ

Switching Frequency Program Input. Connect a resistor from this pin to ground to set

the switching frequency.

Input Supply. This supplies power to all the internal control circuitry, both BS

VIN regulators and the high-side switch. A decoupling capacitor to ground must be placed

close to this pin to minimize the switching spikes.

BST

Bootstrap. This is the positive power supply for the internal floating high-side

MOSFET driver. Connect a bypass capacitor between this pin and SW pin.

MP2488 Rev. 1.0

www.MonolithicPower.com

4

6/20/2011

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2011 MPS. All Rights Reserved.

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