mic3203 Micrel Semiconductor, mic3203 Datasheet
mic3203
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mic3203 Summary of contents
Page 1
... LED current with ±5% accuracy. An external high-side current- sense resistor is used to set the output current. The MIC3203 offers a dedicated PWM input (DIM) which enables a wide range of pulsed dimming. A high-frequency switching operation up to 1.5MHz allows the use of smaller external components minimizing space and cost ...
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... March 2010 Marking Junction Temperature Range −40°C to +125°C MIC3203YM −40°C to +125°C 8-Pin SOIC MIC3203/MIC3203-1 pin supplies the power to the internal circuitry. The VCC in the output CC 2 MIC3203 Package PWM 8-Pin SOIC ...
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... CS(MAX) V Sense Voltage Threshold Low CS(MIN Hysteresis CSHYS CS Current Sense Response Time CS Input Current Frequency F Switching Frequency MAX Dithering (MIC3203 Hysteresis Dithering Range DITH CS F Frequency Dithering Range DITHER March 2010 (1) Operating Ratings Supply Voltage (V Enable Voltage (V Dimming Voltage ( ...
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... DIM From DIM Pin going high to DRV going high Pull Up 10mA SOURCE Pull Down -10mA SINK Rise Time 1000pF LOAD Fall Time 1000pF LOAD T Rising J 4 MIC3203 ≤ +125°C; unless noted. J Min. Typ. Max. 2.0 0 2.0 0 450 20 2 1.5 ...
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... INPUT VOLTAGE (V) Supply Current vs. Input Voltage 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 10LED INPUT VOLTAGE ( MIC3203 L=150µH ILED=1A 10LED 8LED 6LED 4LED 6LED 8LED 10LED 25°C ILED = ...
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... ENABLE VOTLAGE (V) VCC vs. Temperature 6.0 5.0 VIN = 12V 4.0 ICC = 0A 3.0 2.0 1.0 0.0 -40 - 100 120 TEMPERATURE (°C) 6 MIC3203 Current-Sense Voltage vs. Input Voltage 250 200 VCS_MIN 150 VCS_MAX L = 100µH 100 ILED = INPUT VOLTAGE (V) ICC Limit vs. Input Voltage ...
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... TEMPERATURE (°C) UVLO Threshold vs. Temperature 4.5 ON 4.0 3.5 3.0 OFF 2.5 2.0 1.5 1.0 0.5 0.0 -40 - 100 120 TEMPERATURE (°C) 7 MIC3203 Current-Sense Voltage vs. Temperature 250 VCS_MAX 200 VCS_MIN 150 100 ∆_VCS ILED ILED = -40 - 100 120 TEMPERATURE (°C) Thermal Shutdown vs. Input Voltage 180 ...
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... Micrel, Inc. Functional Characteristics March 2010 8 MIC3203 M9999-032410-A ...
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... Micrel, Inc. Functional Characteristics (Continued) March 2010 9 MIC3203 M9999-032410-A ...
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... CS(MAX) signals. . Then the The MIC3203 also has a DIM pin which can turn on and off IN the LEDs HIGH state. This DIM pin controls the brightness of the LED by varying the duty cycle of DIM pin from 1% to 99%. ...
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... Micrel, Inc. Application Information The internal block diagram of the MIC3203 is shown in Figure 1. The MIC3203 is composed of a current-sense comparator, voltage and current reference, 5V regulator and MOSFET driver. Hysteretic mode control – also called bang-bang control – topology that does not employ an error amplifier, using an error comparator instead ...
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... MAX ) CS ( MIN ) 2 × MAX ) CS ( MIN ) ≈ Δ Δ selected such DSON × CON ) RMS ( FET ) DSON I = × LED TOTAL _ LED V IN M9999-032910-A MIC3203 ...
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... LED. Frequency Dithering The MIC3203 is designed to reduce EMI by dithering the switching frequency ± 12% in order to spread the frequency spectrum over a wider range. This lowers the EMI noise and Q can be ...
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... LED. The capacitor must be March 2010 placed as close to the LED as possible. MOSFET Place the MOSTET as close as possible to the MIC3203 to avoid the trace inductance. Provide sufficient copper area on MOSFET ground to dissipate the heat. Diode Place the Schottky diode on the same side of the board as the IC and input capacitor. The connection from the Schottky diode’ ...
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... If there does not happen to be any non-shielded bus wire immediately available, the leads from axial resistors will work. By maintaining the shortest possible ground lengths on the oscilloscope probe, true ripple measurements can be obtained. March 2010 Figure 2. Low Noise Measurement 15 MIC3203 M9999-032910-A ...
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... Micrel, Inc. Evaluation Board Schematic March 2010 16 MIC3203 M9999-032910-A ...
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... Vishay 100kΩ Resistor Size 0805 (9) Vishay 0Ω Resistor, 1%, Size 0805 (9) Vishay 2.2Ω Resistor, 1%, Size 0805 (9) Vishay 10kΩ Resistor Size 0805 High Brightness LED Driver Controller with High-Side (10) Micrel, Inc. Current Sense 17 MIC3203 Qty ...
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... Micrel, Inc. PCB Layout Recommendation March 2010 Top Assembly Top Layer 18 MIC3203 M9999-032910-A ...
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... Micrel, Inc. PCB Layout Recommendation (Continued) March 2010 Bottom Layer 19 MIC3203 M9999-032910-A ...
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... Micrel, Inc. Package Information March 2010 8-Pin SOIC 20 MIC3203 M9999-032910-A ...
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... Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify March 2010 8-Pin SOIC Micrel for any damages resulting from such use or sale. © 2010 Micrel, Incorporated. 21 http://www.micrel.com M9999-032910-A MIC3203 ...