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MIC3202 Datasheet, PDF (1/19 Pages) Micrel Semiconductor – High-Brightness LED Driver with Integrated MOSFET and High-Side Current Sense | |||
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MIC3202/MIC3202-1
High-Brightness LED Driver with
Integrated MOSFET and High-Side
Current Sense
General Description
Features
The MIC3202 is a hysteretic, step-down, constant-current,
High-Brightness LED (HB LED) driver. It provides an ideal
solution for interior/exterior lighting, architectural and
ambient lighting, LED bulbs, and other general illumination
applications.
The MIC3202 is well suited for lighting applications
requiring a wide-input voltage range. The hysteretic control
gives good supply rejection and fast response during load
transients and PWM dimming. The high-side current
sensing and on-chip current-sense amplifier delivers LED
current with ±5% accuracy. An external high-side current-
sense resistor is used to set the output current.
The MIC3202 offers a dedicated PWM input (DIM) which
enables a wide range of pulsed dimming. High-frequency
switching operation of up to 1MHz allows the use of
smaller external components, minimizing space and cost.
The MIC3202 offers a frequency dither feature for low-EMI
applications.
The MIC3202 operates over a junction temperature from
â40°C to +125°C and is available in an 8-pin e-PAD SOIC
package.
⢠6V to 37V input voltage range
⢠High efficiency (>90%)
⢠±5% LED current accuracy
⢠MIC3202: Dither enabled for low EMI
⢠MIC3202-1: Dither disabled
⢠High-side current sense (up to 1A)
⢠Dedicated dimming control input
⢠Hysteretic control (no compensation required)
⢠Up to 1MHz switching frequency
⢠Adjustable constant LED current
⢠Over-temperature protection
⢠â40°C to +125°C junction temperature range
Applications
⢠Architectural, industrial, and ambient lighting
⢠LED bulbs
⢠Indicators and emergency lighting
⢠Street lighting
A dither disabled version MIC3202-1 is also available in
the same package as the MIC3202.
Datasheets and support documentation can be found on
Micrelâs web site at: www.micrel.com.
⢠Channel letters
⢠12V lighting systems (MR-16 bulbs, under-cabinet
lighting, garden/pathway lighting)
_________________________________________________________________________________________________________________________
Typical Application
Efficiency
vs. Input Voltage
100
6LED
8LED
4LED
95
2LED
90
MIC3202 Step-Down LED Driver
85
ILED = 1A
L = 47uH
80
6
14
22
30
38
INPUT VOLTAGE (V)
Micrel Inc. ⢠2180 Fortune Drive ⢠San Jose, CA 95131 ⢠USA ⢠tel +1 (408) 944-0800 ⢠fax + 1 (408) 474-1000 ⢠http://www.micrel.com
September 2010
M9999-091710-A
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