MIC3808YM

MICREL SEMICONDUCTOR  MIC3808YM  芯片, 脉宽调制控制器, 推挽, 8.3-15V, SOIC-8

The is a push-pull PWM Controller features high speed and low power consumption. It is ideal for telecom level 36 to 75V isolated step down dc/dc conversion applications where high output current, small size and high efficiency are required. The dual-ended push-pull architecture of the controller allows more efficient utilization of the transformer than single ended topologies, allowing smaller size dc/dc solutions. Additionally, the out-of-phase push-pull topology allows a higher effective duty cycle, reducing input and output ripple as well as stress on the external components. The dead-time between the two outputs is adjustable between 60 to 200ns, limiting the duty cycle of each output stage to less than 50%. It is built on a low-power, high-speed BiCMOS process. The 130µA start-up current and 1mA run-current reduce the size of the start-up circuitry and allow high efficiency even at light loads.

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Dual output drive stages in push-pull configuration

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Leading edge current-sense blanking

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130µA Typical start-up current

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1mA Typical run current

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Internal soft start

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On-chip error amplifier with 4MHz gain bandwidth product

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On-chip VDD Clamping

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Output drive stages capable of 500mA Peak source current

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1A Peak sink current