Micrel's MIC3203 is a hysteretic, constant current, high brightness LED (HB LED) driver that provides an ideal solution for internal/external lighting, building and ambient lighting, LED lighting, and other general lighting applications.
The MIC3203 is ideal for lighting applications that require a wide voltage input range.
Hysteresis control provides good power supply rejection and fast response during load transients and PWM dimming. High-variation current sensing and on-chip current-sense amplifiers deliver LED current accuracy of ±5%. The output current is set by an external high-side current sense resistor.
The MIC3203 has a dedicated PWM input that enables a wide range of pulse dimming. High-frequency switches up to 1.5MHz allow for minimal external components, minimizing space and cost. The MIC3203 features frequency jitter for EMI control.
The MIC3203 operates from a junction temperature range of -40°C to +125°C and is available in an 8-lead SOIC package.
Main features of MIC3203:
• 4.5V to 42V input voltage range
• High efficiency (>90%)
• ±5% current accuracy
• MIC3203: Activate jitter when low EMI
• MIC3203-1: Jitter failure
• High-side current detection
• Dedicated dimming control input
• Hysteresis control (no compensation required)
• Switching frequency up to 1.5MHz
• Adjustable LED constant current
• Over temperature protection
• -40°C to +125°C junction temperature range
MIC3203 application:
• Building, industrial and peripheral lighting
• LED lights
• Indicator lights and emergency lights
• Street light
• Slotted letters
• 12V lighting system (MR-16 lights, cabinets)
Lighting, garden/path lighting)
MIC3203/MIC3203-1 Evaluation Board
The EV kit is capable of evaluating the MIC3203/MIC3203-1 with a 1A LED current. The evaluation board has all the components on one side and can be easily tested. The device's input voltage range is 4.5V to 42V, which can control external power MOSFETs to drive high current LEDs. When the input voltage approaches and exceeds the UVLO threshold, if the voltage at the EN and DIM pins is high, the internal 5V VCC is regulated and the integrated MOSFET is turned on. The induced current increases linearly. When the CS pin voltage reaches VCS (MAX) associated with VIN, the external MOSFET is turned off and the Schottky diode begins to take over and return current to VIN. Then, the current flowing through the inductor and the LED begins to decay. When the CS pin reaches VCS(MIN), the external MOSFET is turned on and so on. Since this control scheme does not require loop compensation, it is very easy to design and avoid problems during installation.
Claim:
The EV kit requires an independent experimental (backup) power supply with an input voltage that can be adjusted from 4.2V to 45V to provide at least 1A. The load can be either active (electronically loaded) or passive (LED), capable of consuming maximum load power and maintaining an ideal value for communication with the surface of less than 70 °C.
Figure 1 MIC3203 / MIC3203-1 block diagram
Figure 2 MIC3203 buck LED driver circuit
Figure 3 MIC3203 / MIC3203-1 evaluation board circuit diagram
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