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MIC3838 Datasheet(PDF) 2 Page - MIC GROUP RECTIFIERS |
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MIC3838 Datasheet(HTML) 2 Page - MIC GROUP RECTIFIERS |
2 / 11 page MIC3838/3839 Micrel MIC3838/3839 2 April 2005 Pin Configuration 1 COMP FB ILIM RAMP 10 VREF VDD OUTA OUTB 9 8 7 2 3 4 RC GND 6 5 MSOP-10 (MM) Pin Description Pin Number Pin Name Pin Function 1 COMP COMP is the output of the error amplifier and the input of the PWM comparator. The error amplifier in the MIC3838 is a true low-output imped- ance, 4MHz operational amplifier. As such, the COMP pin can both source and sink current. However, the error amplifier is internally current limited, so that zero duty cycle can be externally forced by pulling COMP to GND. The MIC3838 family features built-in full cycle soft start. Soft start is imple- mented as a clamp on the maximum COMP voltage. 2 FB The inverting input to the error amplifier. 3 ILIM The input to the peak current, and overcurrent comparators. The overcurrent comparator is only intended for fault sensing. Exceeding the overcurrent threshold will cause a soft start cycle. An internal MOSFET discharges the current sense filter capacitor to improve dynamic perfor- mance of the power converter. 4 RAMP Input to the PWM comparator. Sawtooth ramp for PWM control. Allows for either current-mode or voltage-mode control. An internal MOSFET dis- charges the current sense filter capacitor. 5 RC The oscillator programming pin. Only two components are required to program the oscillator, a resistor (tied between VDD and RC), and a capaci- tor (tied between RC and GND). The approximate oscillator frequency is determined by the simple formula: F 1.41 RC OSCILLATOR = × The recommended range of timing resistors is between 7kΩ and 200kΩ and range of timing capacitors is between 100pF and 1000pF. Timing resistors less than 7kΩ should be avoided. For best performance, keep the leads between components as short as possible. Separate ground and VDD traces to the external timing network are encouraged. 6 GND Ground. Return path for signal and gate drive functions. Ordering Information Part Number Turn On Turn Off Standard Lead-Free Threshold Threshold Temperature Range Package MIC3838BMM MIC3838YMM 12.5V 8.3V –40°C to +85°C 10-Pin MSOP MIC3839BMM MIC3839YMM 4.3V 4.1V –40°C to +85°C 10-Pin MSOP |
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