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MIC3230_11 Datasheet, PDF (1/19 Pages) Micrel Semiconductor – Constant Current Boost Controller for Driving High Power LEDs | |||
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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
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
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-
voltage lock-out (UVLO).
The MIC3231 offers a dither feature to assist in the
reduction of EMI. This is particularly useful in sensitive EMI
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
offered in both the EPAD 16-pin TSSOP package and the
12-pin 3mm à 3mm MLF® package.
Datasheets and support documentation can be found on
Micrelâs web site at: www.micrel.com.
Features
Bringing the Power to Lightâ¢
⢠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)
⢠Packages:
VIN 1
EN 2
PWMD 3
COMP 4
IADJ 5
10 VDD
9 DRV
8 PGND
7 OVP
6 IS
VIN 1
EN 2
PWMD 3
COMP 4
IADJ 5
FS 6
EPAD
12 VDD
11 DRV
10 PGND
9 OVP
8 IS
7 SYNC/NC
N/C 1
VIN 2
EN 3
PWMD 4
COMP 5
IADJ 6
FS 7
AGND 8
EPAD
16 N/C
15 VDD
14 DRV
13 PGND
12 OVP
11 IS
10 SYNC/NC
9 N/C
MIC3232
10-pin MSOP
MIC3230/1
12-pin MLF®
MIC3230/1
16-pin TSSOP
⢠â40°C to +125°C junction temperature range
Applications
⢠Street lighting
⢠Solid state lighting
⢠General illumination
⢠Architectural lighting
⢠Constant current power supplies
Bringing the Power to Light is a trademark of Micrel, Inc.
MicroLeadFrame 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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