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 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 output inverter can typically source 500 mA and sink 700 mA. Shoot-through current is all but eliminated to minimize supply current requirements. 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 FB 5 CURRENT COMPENSATION SENSE 6 13 SYNC 10 ROSC 8 Error Amplifier NI 4 B2 − + COSC 9 OSC Out OSC Enable 2V VREF 3 + Ref Gen − − + R Q S 4.6 V SS 7 + 20 mA 12 DRIVER OUTPUT − 11 1.25 V −VIN −VIN VCC Substrate 20 mA VCC +VIN 14 Q 2 SHUTDOWN R 1 − − − + Document Number: 70025 S-42044—Rev. E, 15-Nov-04 S + + 0.2 V 9.2 V Undervoltage Lockout 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 ROSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 kW to 1 MW VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.5 V to 16.5 V COSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 pF to 200 pF +VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 V to 200 V Linear Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VCC − 4 V fOSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 kHz to 2 MHz Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VCC SPECIFICATIONS Test Conditions Unless Otherwise Specified Parameter Symbol Limits D Suffix −40 to 85_C Oscillator Disabled −VIN = 0 V, VCC = 10 V Mina Typb Maxa OSC Disabled, TA = 25_C 3.94 4.0 4.06 OSC Disabled Over Voltage and Temperature Rangesc 3.88 4.0 4.12 Unit Reference Output Voltage Short Circuit Current Load Regulation VR V ISREF VREF = −VIN −30 −5 mA DVR/DIR IREF = 0 to −1 mA 10 40 mV Oscillator Initial Accuracy fOSCd ROSC = 374 kW, COSC = 200 pF 90 100 110 ROSC = 70 kW, COSC = 200 pF 450 500 550 4 7 % 200 500 ppm/_C kHz Df/f ROSC = 70 kW, COSC = 200 pF Df/f = [f(16.5 V) − f(9.5 V)] / f(9.5 V) Temperature Coefficientc OSC TC −40 v TA v 85_C, fOSC = 100 kHz Sync Output Current (Master Mode) ISYNC(M) VROSC v 5 V Sync Output Current (Slave Mode) ISYNC(S) VROSC = VCC "1 "500 VFB = 5 V, NI = VREF <1.0 "200 nA "5 "25 mV Voltage Stabilityc "1.0 mA "3.0 nA Error Amplifier (COSC = −VIN OSC Disabled) Input BIAS Current IFB Input OFFSET Voltage VOS2 Open Loop Voltage Gainc AVOL Unity Gain Bandwidthc Output Current Power Supply Rejection www.vishay.com 2 65 BW IOUT PSRR 1.8 Source (VFB = 3.5 V, NI = VREF) 80 dB 2.7 −2.7 Sink (VFB = 4.5 V, NI = VREF) 1.0 2.4 9.5 V v VCC v 16.5 V 50 80 MHz −1.0 mA dB Document Number: 70025 S-42044—Rev. E, 15-Nov-04 Si9114A Vishay Siliconix SPECIFICATIONS Test Conditions Unless Otherwise Specified Parameter Symbol Oscillator Disabled −VIN = 0 V, VCC = 10 V Limits D Suffix −40 to 85_C Mina Typb Maxa t1 10 Unit Pre-Regulator/Start-Up Input Leakage Current Pre-Regulator Start-Up Current VCC Pre-Regulator Voltage +IIN +VIN = 200 V, VCC w 10 V ISTART +VIN = 48 V, tPW v 300 ms, VCC = VUVLO 8 20 VPR +VIN = 48 V 8.8 9.1 9.4 mA mA VPR −VUVLO (Turn-On) VDELTA 0.1 0.25 0.7 Undervoltage Lockout Hysteresis VHYST 0.18 0.28 0.4 fOSC = 100 kHz 1.5 2.5 fOSC = 500 kHz 2.2 3.0 V Supply Supply Current ICC CLOAD v 50 pF mA Protection Current Limit Threshold Voltage VSENSE VFB = 0 V, NI = VREF 1.23 1.30 V Current Limit Delay to Outputc td VSENSE = 1.5 V, See Figure 1 77 100 ns SHUTDOWN Logic Threshold VSD 2.8 0.5 V SHUTDOWN Delay to Latched Outputc tSD See Figure 2 0.20 1.0 ms SHUTDOWN Pull-Up Current ISD VSD = 0 V 12 23 30 Soft-Start Current ISS 12 23 30 1.6 0.5 Output Inhibit Voltage VSS(off) Soft-Start Voltage to Disable Driver Output Output High Voltage VOH IOUT = −10 mA Output Low Voltage VOL IOUT = 10 mA 1.15 mA V MOSFET Driver Peak Output Currentc ISOURCE VOUT = 0 V ISINK VOUT = VCC 9.85 500 9.9 0.05 0.15 −400 −200 1000 V mA 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 v 5 pF on COSC. Document Number: 70025 S-42044—Rev. E, 15-Nov-04 www.vishay.com 3 Si9114A Vishay Siliconix TYPICAL CHARACTERISTICS Oscillator Frequency 1000 tr for CL = 2500 pF Output Rise and Fall Time (ns) 100 pF 150 pF 200 pF f OUT (kHz) Output Driver Rise and Fall Time 80 47 pF 100 Note: These curves were measured in a board with 3.5 pF of external parasitic capacitance. 60 tf for CL = 2500 pF 40 tr for CL = 1000 pF tf for CL = 1000 pF 20 tr 10% to 90% tf 90% to 10% 0 10 10 100 0 1000 9 10 rOSC − Oscillator Resistance (kW) Supply Current vs. Output Frequency 36 14 15 16 17 16 CL = 1000 pF 12 8 CL = 0 pF 4 9 I CC − Supply Current (mA) I CC − Supply Current (mA) CL = 2500 pF 20 13 ROSC = 127 kW COSC = 47 pF fs = 500 kHz 28 24 12 Supply Current vs. Supply Voltage 12 VCC = 12 V COSC = 47 pF 32 11 VCC − Supply Voltage (V) CL = 1000 pF 6 3 CL = 0 pF 0 0 0 200 400 600 800 1000 0 9 10 11 12 13 14 15 16 17 VCC − Supply Voltage (V) fOUT − Output Frequency (kHz) Switching Frequency vs. Supply Voltage 1.05 ROSC = 56 kW COSC = 47 pF Switching Frequency (MHz) 1.00 0.95 0.90 0.85 0 8 9 10 11 12 13 14 15 16 17 VCC − Supply Voltage (V) www.vishay.com 4 Document Number: 70025 S-42044—Rev. E, 15-Nov-04 Si9114A Vishay Siliconix TIMING WAVEFORMS Current Sense VCC 1.5 V− tr v 10 ns 50% 0 Output SHUTDOWN tf v 10 ns 50% tSD td VCC VCC− 90% 90% Output 0 0 FIGURE 1. FIGURE 2. PIN CONFIGURATIONS AND ORDERING INFORMATION Dual-In-Line and SOIC ORDERING INFORMATION Part Number +VIN 1 14 VCC SHUTDOWN 2 13 CURRENT SENSE Si9114ADY 12 DRIVER OUTPUT Si9114ADY-T1 Si9114ADY-T1—E3 VREF 3 NI 4 11 −VIN FB 5 10 SYNC COMPENSATION 6 9 COSC SS 7 8 ROSC Temperature Range Package SOIC-14 −40 to 85_C Si9114ADJ PDIP-14 Si9114ADJ—E3 Top View APPLICATIONS VO Si9420DY VCC +VIN SD SENSE VREF OUT −VIN NI FB SYNC COMP COSC SS ROSC TL431 Si9114A −48 V (−42 to −56 V) FIGURE 3. 15-W Forward Converter Schematic Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability data, see http://www.vishay.com/ppg?70025. Document Number: 70025 S-42044—Rev. E, 15-Nov-04 www.vishay.com 5