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MIC2295BML Datasheet(PDF) 6 Page - Micrel Semiconductor |
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MIC2295BML Datasheet(HTML) 6 Page - Micrel Semiconductor |
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6 / 9 page  Micrel MIC2295 July 2004 M9999-052402 6 (408) 955-1690 Functional Description The MIC2295 is a high power density, PWM dc/dc boost regulator. The block diagram is shown in Figure 1. The MIC2295 is composed of an oscillator, slope compensation ramp generator, current amplifier, gm error amplifier, PWM generator, and a 1.2A bipolar output transistor. The oscillator generates a 1.2MHz clock. The clock’s two functions are to trigger the PWM generator that turns on the output transistor, and to reset the slope compensation ramp generator. The current amplifier is used to measure the switch current by amplifying the voltage signal from the internal sense resistor. The output of the current amplifier is summed with the output of the slope compensation ramp generator. This summed current-loop signal is fed to one of the inputs of the PWM generator. The gm error amplifier measures the feedback voltage through the external feedback resistors and amplifies the error between the detected signal and the 1.24V reference voltage. The output of the gm error amplifier provides the voltage-loop signal that is fed to the other input of the PWM generator. When the current-loop signal exceeds the voltage- loop signal, the PWM generator turns off the bipolar output transistor. The next clock period initiates the next switching cycle, maintaining constant frequency current-mode PWM control. GND CA PWM Generator Ramp Generator 1.2MHz Oscillator SW EN FB OVP* VIN 1.24V *OVP available on MLFTM package option only. gm OVP* Σ VREF MIC2295 MIC2295 Block Diagram |
Similar Part No. - MIC2295BML |
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Similar Description - MIC2295BML |
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