General Description
●The MIC3808 and MIC3809 are a family of complementary output push-pull PWM control ICs that feature high speed and low power consumption. The MIC3808/9 are ideal for telecom level (36V 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 MIC3808/9 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 60ns to 200ns, limiting the duty cycle of each output stage to less than 50%.
●Features
●• Dual output drive stages in push-pull configuration
●• Leading edge current-sense blanking
●• 130µA typical start-up current
●• 1mA typical run current
●• Operation to 1MHz
●• Internal soft start
●• On-chip error amplifier with 4MHz gain bandwidth product
●• On-chip VDD clamping
●• Output drive stages capable of 500mA peak source current, 1A peak sink current
●Applications
●• High efficiency “brick” power supply modules
●• Half bridge converters
●• Full bridge converters
●• Push-pull converters
●• Voltage-fed push-pull converters
●• Telecom equipment and power supplies
●• Networking power supplies
●• Industrial power supplies
●• 42V automotive power supplies
●• Base stations
