SI9114A Datasheet | Vishay

FEATURES D 15- to 200-V Input Range D Current-Mode Control D Internal Start-Up Circuit D Latched SHUTDOWN D Soft-Start D 1.8-MHz Error Amp DESCRIPTION The Si9114A is a Bi C/DMOS current-mode pulse width modulation (PWM) controller IC for high-frequency dc/dc converters. Single-ended topologies (forward and flyback) can be implemented at frequencies up to 1 MHz. The oscillator has an internal divide-by-two that limits the duty ratio to 50%. An oscillator sync output allows converters to be synchronized in phase as well as in frequency, in a master/slave configuration. The output inverter can typically source 500 m A and sink 700 m A. Shoot-through current is all but eliminated to minimize supply current requirements. The high-voltage DMOS transistor allows the IC to interface directly to bus voltages up to 200 V. Other features include a 1.5% accurate voltage reference, 1.8-MHz (min) bandwidth error amplifier, shutdown logic control, soft-start and undervoltage lockout circuits. The Si9114A is available in both standard and lead (Pb)-free 14-pin plastic DIP and SOIC packages, and is specified over the industrial, D suffix (- 40_C to 85_C) temperature range. FUNCTIONAL BLOCK DIAGRAM CURRENT PENSATION SENSE 6 13 Error Amplifier NI 4 - + 2V VREF 3 Ref Gen 4.6 V 7 20 m A + - - + + - 1.25 V - VIN Substrate 20 m A VCC 14 Q 1 - - + + - + 0.2 V 9.2 V Undervoltage Lockout S R 2 SHUTDOWN VCC R S 12 DRIVER OUTPUT 11 - VIN Q Enable FB 5 SYNC 10 OSC Out ROSC 8 COSC 9 B2 +VIN Document Number: 70025 S-42044- Rev. E, 15-Nov-04 .vishay. Vishay Siliconix ABSOLUTE MAXIMUM RATINGS Voltages Referenced to - VIN VCC - - - - - - - - - - - . . 18 V +VIN (Note: VCC < +VIN + 0.3 V) - - - - - - . 200 V Logic Input (SHUTDOWN, SYNC) - - - . - 0.3 V to VCC + 0.3 V Linear Inputs (FEEDBACK, SENSE,...