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MIC3202

更新时间: 2024-11-21 14:53:59
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美国微芯 - MICROCHIP /
页数 文件大小 规格书
19页 846K
描述
The MIC3202 is a hysteretic, step-down, constant-current, High-Brightness LED (HB LED) driver. It

MIC3202 数据手册

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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.  
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  
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.  
• −40°C to +125°C junction temperature range  
Applications  
Architectural, industrial, and ambient lighting  
LED bulbs  
Indicators and emergency lighting  
Street lighting  
The MIC3202 operates over a junction temperature from  
40°C to +125°C and is available in an 8-pin e-PAD SOIC  
package.  
Channel letters  
A dither disabled version MIC3202-1 is also available in  
the same package as the MIC3202.  
12V lighting systems (MR-16 bulbs, under-cabinet  
lighting, garden/pathway lighting)  
Datasheets and support documentation can be found on  
Micrel’s web site at: www.micrel.com.  
_________________________________________________________________________________________________________________________  
Typical Application  
Efficiency  
vs. Input Voltage  
100  
6LED  
8LED  
4LED  
95  
90  
85  
80  
2LED  
ILED = 1A  
L = 47uH  
6
14  
22  
30  
38  
INPUT VOLTAGE (V)  
MIC3202 Step-Down LED Driver  
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com  
M9999-091710-A  
September 2010  

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