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| SI9114A Vishay Siliconix High-Frequency Switchmode Controller FEATURES * 15- to 200-V Input Range * Current-Mode Control * Internal Start-Up Circuit * Latched SHUTDOWN * Soft-Start * 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 14-pin plastic DIP and SOIC packages, and is specified over the industrial, D suffix (-40C to 85C) temperature range. FUNCTIONAL BLOCK DIAGRAM FaxBack 408-970-5600, request 70025 www.siliconix.com S-60752--Rev. C, 05-Apr-99 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 150C Operating Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to 85C Junction Temperature (TJ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150C Power Dissipation (Package)a 14-Pin Plastic Dip (J Suffix)b . . . . . . . . . . . . . . . . . . . . . . . . . 750 mW 14-Pin SOIC (Y Suffix)c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900 mW Thermal Impedance (JA) 14-Pin Plastic Dip. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .167C/W 14-Pin SOIC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .140C/W Notes a. Device mounted with all leads soldered or welded to PC board. b. Derate 6 mW/C above 25C. c. Derate 7.2 mW/C above 25C. 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 k to 1 M COSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 pF to 200 pF Linear Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VCC - 4 V Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VCC SPECIFICATIONS Test Conditions Parameter Reference OSC Disabled, TA = 25C Output Voltage Short Circuit Current Load Regulation VR ISREF VR/IR 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 85C Symbol Unless Otherwise Specified 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 f/f OSC TC ISYNC(M) ISYNC(S) ROSC = 374 k, COSC = 200 pF ROSC = 70 k, COSC = 200 pF ROSC = 70 k, COSC = 200 pF f/f = [f(16.5 V) - f(9.5 V)] / f(9.5 V) -40 TA 85C, fOSC = 100 kHz VROSC 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 Output Current Power Supply Rejection IFB VOS2 AVOL BW IOUT PSRR Source (VFB = 3.5 V, NI = VREF) Sink (VFB = 4.5 V, NI = VREF) 9.5 V VCC 16.5 V 1.0 50 65 1.8 VFB = 5 V, NI = VREF <1.0 5 80 2.7 -2.7 2.4 80 -1.0 200 25 nA mV dB MHz mA dB S-60752--Rev. C, 05-Apr-99 2 FaxBack 408-970-5600, request 70025 www.siliconix.com SI9114A Vishay Siliconix SPECIFICATIONS Test Conditions Parameter Pre-Regulator/Start-Up Input Leakage Current Pre-Regulator Start-Up Current VCC Pre-Regulator Voltage VPR -VUVLO (Turn-On) Undervoltage Lockout Hysteresis +IIN ISTART VPR VDELTA VHYST +VIN = 200 V, VCC 10 V +VIN = 48 V, tPW 300 s, VCC = VUVLO +VIN = 48 V 8 8.8 0.1 0.18 <1 20 9.1 0.25 0.28 9.4 0.7 0.4 V 10 A mA Limits D Suffix -40 to 85C Symbol Unless Otherwise Specified Oscillator Disabled -VIN = 0 V, VCC = 10 V Mina Typb Maxa Unit Supply Supply Current ICC CLOAD 50 pF fOSC = 100 kHz fOSC = 500 kHz 1.5 2.2 2.5 3.0 mA Protection Current Limit Threshold Voltage Current Limit Delay to Outputc VSENSE td VSD tSD ISD ISS V SS(off) Soft-Start Voltage to Disable Driver Output See Figure 2. VSD = 0 V 12 12 VFB = 0 V, NI = VREF VSENSE = 1.5 V, See Figure 1. 1.15 1.23 77 2.8 0.20 23 23 1.6 1.30 100 0.5 1.0 30 30 0.5 V ns V s A V SHUTDOWN Logic Threshold SHUTDOWN Delay to Latched Outputc SHUTDOWN Pull-Up Current Soft-Start Current Output Inhibit Voltage MOSFET Driver Output High Voltage Output Low Voltage Peak Output Currentc Notes a. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum. b. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing. c. Guaranteed by design, not subject to production test. d. CSTRAY 5 pF on COSC. VOH VOL ISOURCE ISINK IOUT = -10 mA IOUT = 10 mA VOUT = 0 V VOUT = VCC 500 9.85 9.9 0.05 -400 1000 0.15 -200 V mA FaxBack 408-970-5600, request 70025 www.siliconix.com S-60752--Rev. C, 05-Apr-99 3 SI9114A Vishay Siliconix TYPICAL CHARACTERISTICS (25C UNLESS OTHERWISE NOTED) S-60752--Rev. C, 05-Apr-99 4 FaxBack 408-970-5600, request 70025 www.siliconix.com |
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