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MIC3230 Datasheet(PDF) 8 Page - Micrel Semiconductor |
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MIC3230 Datasheet(HTML) 8 Page - Micrel Semiconductor |
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8 / 20 page  Micrel, Inc. MIC3230/1/2 January 2009 8 M9999-011409-A Functional Description A constant output current converter is the preferred method for driving LEDs. Small variations in current have a minimal effect on the light output, whereas small variations in voltage have a significant impact on light output. The MIC323x family of LED drivers are specifically designed to operate as constant current LED Drivers and the typical application schematic is shown in Figure 1. The MIC323x family are designed to operate as a boost controller, where the output voltage is greater than the input voltage. This configuration allows for the design of multiple LEDs in series to help maintain color and brightness. The MIC323x family can also be configured as a SEPIC controller, where the output voltage can be either above or below the input voltage. The MIC3230/1/2 have a very wide input voltage range, between 6V and 45V, to help accommodate for a diverse range of input voltage applications. In addition, the LED current can be programmed to a wide range of values through the use of an external resistor. This provides design flexibility in adjusting the current for a particular application need. The MIC3230/1/2 features a low impedance gate driver capable of switching large MOSFETs. This low impedance helps provide higher operating efficiency. The MIC323x family can control the brightness of the LEDs via its PWM dimming capability. Applying a PWM signal (up to 500Hz) to the PWMD pin allows for control of the brightness of the LED. Each member of the MIC323x family employs peak current mode control. Peak current mode control offers advantages over voltage mode control in the following manner. Current mode control can achieve a superior line transient performance compared to voltage mode control and through small signal analysis (not shown here), current mode control is easier to compensate than voltage mode control, thus allowing for a less complex control loop stability design. Figure 2 shows the functional block diagram. Control RSLC RCS VDD OVP PWMD GND Q1 C5 L1 IS S R Q Clock Out VRAMP Out SYNC SYNC FS IADJ RADJ EN LDO VIN Internal VBIAS VDD FS VC VS 10k 0.25V Ai Ai = 1.4V VRAMP IN ISLOPE COMP OUT ISLOPE COMP Leading Edge Blanking 0.45V T T 250µa/T VOUT COMP VIN LED LED DRV VOUT Figure 2. MIC3230 Functional Block Diagram |
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Similar Description - MIC3230 |
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