EV0021 datasheet(1/4 Pages) MPS

部件名	EV0021

功能描述	MP1521 High Efficiency White LED Driver

PDF	4 Pages

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制造商	MPS [Monolithic Power Systems]

网页	http://www.monolithicpower.com

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EV0021

MP1521 High Efficiency

White LED Driver

EVALUATION BOARD

EV0021 Rev 1.1_01/21/03

www.monolithicpower.com

1

Monolithic Power Systems

General Description

The EV0021 evaluation board uses the

MP1521 to drive up to three strings of 5 White

LEDs.

This MP1521 uses a peak current,

constant minimum off-time architecture and

has

three

individual

current-sensing

feedbacks. The OLS pin is designed for

detecting loose or open LED connections.

The feedback pins measure voltage across

sense resistors in series with the LED strings.

When supplying a bias current of 20mA, the

voltage drop across the sense resistor is only

0.4V to minimize power loss. Either a DC

voltage or a PWM signal at the BRT/PWM

input can control the LED brightness.

The

MP1521 has an on board power MOSFET

switch that is protected by current limit, open

load shutdown, thermal shutdown, and under

voltage lockout.

Ordering Information

Board Number

MPS IC Number

EV0021

MP1521EQ

Absolute Maximum Ratings

Supply Voltage (VIN)

28V

Switch Voltage to GND

-0.5V to 28V

VEN,VREF, VBRT, VFB1, VFB2, VFB3

–0.3V to 6V

Storage Temperature

-55

°C to +150°C

Recommended Operating Conditions

Supply Voltage (VIN)

2.7 V to 25V

Figure 1: EV0021 Evaluation Board

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