KA3511D Datasheet | Fairchild Semiconductor

.. INTELLIGENT VOLTAGE MODE PWM IC GENERAL DESCRIPTION The KA3511/D is a fixed-frequency improvedperformance pulse-width modulation control circuit with plete housekeeping circuitry for use in the secondary side of SMPS (Switched mode power supply). It contains various functions, which are precision voltage reference, over voltage protection, under voltage protection, remote on/off control, power good signal generator and etc. OVP (Over voltage protection) section It has OVP functions for +3.3V,+5V,+12V and PT outputs. The circuit is made up of a parator with four detecting inputs and without hysteresis voltage. Especially, PT (Pin16) is prepared for an extra OVP input or another protection signal. UVP (Under voltage protection) section It also has UVP functions for +3.3V, +5V, +12V outputs. The block is made up of a parator with three detecting inputs and without hysteresis voltage. Remote on/off section KA3511/D 22-DIP-400 / 24-SOP-300 ORDERING INFORMATION Device KA3511 KA3511D Package 22 DIP 24 SOP Operating Temperature -25°C ~ 85°C -25°C ~ 85°C Features . - plete PWM control and house keeping Remote on/off section is used to control SMPS circuitry externally. If a high signal is supplied to the remote on/ off input, PWM signal bees a high state and all - Few external ponents secondary outputs are grounded. The remote on/off - Precision voltage reference trimmed to 2% signal is transferred with some on-delay and off-delay time of 8ms, 24ms respectively. - Dual output for push-pull operation - Precision reference section The reference voltage trimmed to ± 2% (4.9V≤Vref≤5.1V) PG (Power good signal generator) section Power good signal generator is to monitor the voltage level of power supply for safe operation of a microprocessor. KA3511 requires few external ponents to acplish a plete housekeeping circuits for SMPS. The KA3511 is available in a 22-pin dual in-line package. - - - - - - - - - Each...