SI9114A

Si9114A Vishay Siliconix High-Frequency Switchmode Controller 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 BiC/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 mA and sink 700 mA. 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 COMPENSATION SENSE 6 13 Error Amplifier NI 4 − + 2V VREF 3 Ref Gen 4.6 V 7 20 mA + − − + + − 1.25 V −VIN Substrate 20 mA 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 OSC SS +VIN Document Number: 70025 S-42044—Rev. E, 15-Nov-04 www.vishay.com 1 Si9114A 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, SOFT-START) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to VCC + 0.3 V HV Pre-Regulator Input Current (continuous) . . . . . . . . . . . . . . . . . . . . . 5 mA Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65 to 150_C Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −40 to 85_C Junction Temperature (TJ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150_C Power Dissipation (Package)a 14-Pin Plastic Dip (J Suffix)b . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750 mW 14-Pin SOIC (Y Suffix)c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900 mW Thermal Impedance (QJA) 14-Pin Plastic Dip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167_C/W 14-Pin SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140_C/W Notes a. Device mounted with all leads soldered or welded to PC board. b. Derate 6 mW/_C above 25_C. c. Derate 7.2 mW/_C above 25_C. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED OPERATING RANGE Voltages Referenced to −VIN VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.5 V to 16.5 V +VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 V to 200 V fOSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 kHz to 2 MHz ROSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 kW to 1 MW COSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 pF to 200 pF Linear Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VCC − 4 V Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VCC SPECIFICATIONS Test Conditions Unless Otherwise Specified Parameter Reference OSC Disabled, TA = 25_C Output Voltage Short Circuit Current Load Regulation VR ISREF DVR/DIR OSC Disabled Over Voltage and Temperature Rangesc VREF = −VIN IREF = 0 to −1 mA 3.94 3.88 4.0 4.0 −30 10 4.06 4.12 −5 40 V mA mV Limits D Suffix −40 to 85_C Symbol Oscillator Disabled −VIN = 0 V, VCC = 10 V Mina Typb Maxa Unit Oscillator Initial Accuracy Voltage Stabilityc Temperature Coefficientc Sync Output Current (Master Mode) Sync Output Current (Slave Mode) fOSCd Df/f OSC TC ISYNC(M) ISYNC(S) ROSC = 374 kW, COSC = 200 pF ROSC = 70 kW, COSC = 200 pF ROSC = 70 kW, COSC = 200 pF Df/f = [f(16.5 V) − f(9.5 V)] / f(9.5 V) −40 v TA v 85_C, fOSC = 100 kHz VROSC v 5 V VROSC = VCC "1.0 90 450 100 500 4 200 "3.0 "1 "500 110 550 7 500 kHz % ppm/_C mA nA Error Amplifier (COSC = −VIN OSC Disabled) Input BIAS Current Input OFFSET Voltage Open Loop Voltage Gainc Unity Gain Bandwidthc IFB VOS2 AVOL BW IOUT PSRR Source (VFB = 3.5 V, NI = VREF) Sink (VFB = 4.5 V, NI = VREF) 9.5 V v VCC v 16.5 V 1.0 50 65 1.8 VFB = 5 V, NI = VREF