MIC3231YTSE【PDF 1/19 页】IC LED DRVR HP CONS CURR 16TSSOP

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MIC3230/1/2

Constant Current Boost Controller for

Driving High Power LEDs

General Description

The MIC3230/1/2 are constant current boost switching

controllers specifically designed to power one or more

strings of high power LEDs. The MIC3230/1/2 have an

input voltage range from 6V to 45V and are ideal for a

Features

Bringing the Power to Light?

variety of solid state lighting applications.

The MIC3230/1/2 utilizes an external power device which

offers a cost conscious solution for high power LED

applications. The powerful drive circuitry can deliver up to

70W to the LED system. Power consumption has been

minimized through the implementation of a 250mV

feedback voltage reference providing an accuracy of ±3%.

The MIC323x family is dimmable via a pulse width

modulated (PWM) input signal and also features an enable

pin for low power shutdown.

Multiple MIC3230 ICs can be synchronized to a common

operating frequency. The clocks of these synchronized

devices can be used together in order to help reduce noise

and errors in a system.

An external resistor sets the adjustable switching

6V to 45V input supply range

Capable of driving up to 70W

Ultra low EMI via dithering on the MIC3231

Programmable LED drive current

Feedback voltage = 250mV ±3%

Programmable switching frequency (MIC3230/1) or

400kHz fixed frequency operation (MIC3232)

PWM Dimming and separate enable shutdown

Frequency synchronization with other MIC3230s

Protection features:

Over Voltage Protection (OVP)

Over temperature protection

Under-voltage Lock-out (UVLO)

frequency of the MIC3230/1. The switching frequency can

be between 100kHz and1MHz. Setting the switching

frequency provides the mechanism by which a design can

be optimized for efficiency (performance) and size of the

external components (cost). The MIC323x family of LED

drivers also offer the following protection features: Over

voltage protection (OVP), thermal shutdown and under-

? Packages:

VIN 1

EN 2

PWMD 3

COMP 4

IADJ 5

10 VDD

9 DRV

8 PGND

7 OVP

6 IS

VIN

PWMD

COMP

IADJ

EPAD

12 VDD

11 DRV

10 PGND

9 OVP

8 IS

7 SYNC/NC

N/C

VIN

PWMD

COMP

IADJ

AGND

EPAD

16 N/C

15 VDD

14 DRV

13 PGND

12 OVP

11 IS

10 SYNC/NC

9 N/C

12-pin MLF

voltage lock-out (UVLO).

The MIC3231 offers a dither feature to assist in the

reduction of EMI. This is particularly useful in sensitive EMI

MIC3232

10-pin MSOP

MIC3230/1

16-pin TSSOP

applications, and provides for a reduction or emissions by

approximately 10dB.

The MIC3232 is a 400kHz fixed frequency device offered

in a small 10-pin MSOP package. The MIC3230/1 are

? –40°C to +125°C junction temperature range

Applications

offered in both the EPAD 16-pin TSSOP package and the

12-pin 3mm × 3mm MLF ? package.

Datasheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Street lighting

Solid state lighting

General illumination

Architectural lighting

Constant current power supplies

Bringing the Power to Light is a trademark of Micrel, Inc.

Micro LeadFrame and MLF are registered trademarks of Amkor Technology.

Micrel Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel +1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com

March 2011

M9999-030311-D

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