features„ pc half-bridge (or 494) power supply supervisor +
two 431 + pwm
„ high integration & few external components
„ over-voltage protection for 3.3v, 5v and 12v
„ under-voltage protection for 3.3v, 5v and 12v
„ under-voltage protection for –12v and/or –5v
„ over-power and short-circuit protection
„ power-down warning circuitry
„ power good circuitry
„ delay time for pson and pg signal
„ remote on/off function
„ on-chip oscillator and error amplifier
„ two shunt regulator for 3.3v and 5v-standby
„ latching pwm for cycle-by-cycle switching
„ push-pull pwm operation and totem pole outputs
„ soft-start and maximum 93% duty cycle
applicationsswitching mode power supply for computers, such as:
atx nlx sfx (micro-atx)descriptionsg6105 controller is designed for switching mode power supply for desktop pcs. it provides all the functions necessary to monitor and control the output of the power supply. remote on/off control, power good circuitry, some protection features against over-voltage and over-power are implemented. it directly senses all the output rails for ovp without the need of external dividers. an innovated ac-signal sampling circuitry provides a sufficient power-down warning signal for pg. a built-in timer generates accuracy timing for control circuit including the ps-off delay. the cycle-by-cycle pwm switching prevents the power transformer from the saturation and ensures the fastest response for the short-circuit protection which greatly reduce the stress for power transistors. two internal precision tl431 shunt regulators provide stable reference voltage and driver for
3.3v and 5v-standby regulation. utilizing minimum number of external components, the sg6105 includes all of the functions for push-pull and/or half-bridge topology, decreasing the production cost and pcb space, and increasing the mtbf for power supply.