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| SI9108 New Product Vishay Siliconix 1-W High-Voltage Switchmode Regulator FEATURES * CCITT Compatible * Current-Mode Control * Low Power Consumption (less than 5 mW) * 10- to 120-V Input Range * 200-V, 250-mA MOSFET * Internal Start-Up Circuit * SHUTDOWN and RESET * Maximum Duty Cycle of 99.9% DESCRIPTION The SI9108 high-voltage switchmode regulator is a monolithic BiC/DMOS integrated circuit which contains most of the components necessary to implement a high-efficiency dc/dc converter in ISDN terminals up to 3 watts. A 0.5-mA max supply current makes possible the design of a dc/dc converter with 60% efficiency at 25 mW, therefore meeting the recommended performance under the CCITT I.430 specifications. This device may be used with an appropriate transformer to implement isolated flyback power converter topologies to provide single or multiple regulated dc outputs (i.e., 5 V). The SI9108 is available in 16-pin wide-body SOIC, 14-pin plastic DIP, and 20-pin PLCC packages, and is specified over the industrial, D suffix (-40 to 85C) temperature range. FUNCTIONAL BLOCK DIAGRAM FaxBack 408-970-5600, request 70883 www.siliconix.com S-62188--Rev. A, 05-Apr-99 1 SI9108 Vishay Siliconix ABSOLUTE MAXIMUM RATINGS Voltages Referenced to -VIN (VCC < +VIN + 0.3 V) VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 V +VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 V VDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 V ID (Peak) (300 s pulse, 2% duty cycle). . . . . . . . . . . . . . . . . . . . . 2 A ID (rms) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .250 mA Logic Inputs (RESET, SHUTDOWN, OSC IN) . . -0.3 V to VCC + 0.3 V Linear Inputs (FEEDBACK, SOURCE) . . . . . . . . . . . . . . -0.3 V to 7 V HV Pre-Regulator Input Current (continuous) . . . . . . . . . . . . . . .5 mA Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to 125C Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to 85C Junction Temperature (TJ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150C Power Dissipation (Package)a 14-Pin Plastic DIP (J Suffix)b. . . . . . . . . . . . . . . . . . . . . . . . . 750 mW 16-Pin Plastic Wide-Body SOIC (W Suffix)c . . . . . . . . . . . . . 900 mW 20-Pin PLCC (N Suffix)d . . . . . . . . . . . . . . . . . . . . . . . . . . . 1400 mW Thermal Impedance (JA) 14-Pin Plastic DIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167C/W 16-Pin Plastic Wide-Body SOIC . . . . . . . . . . . . . . . . . . . . . . 140C/W 20-Pin PLCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90C/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 d. Derate 11.2 mW/C above 25C New Product RECOMMENDED OPERATING RANGE Voltages Referenced to -VIN VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 V to 13.5 V +VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 V to 120 V fOSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40 kHz to 1 MHz ROSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 k to 1 M Linear Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VCC - 3 V Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VCC SPECIFICATIONSa Test Conditions Unless Otherwise Specified Parameter Reference Output Voltage Output Impedancee Short Circuit Current Temperature Stability Long Term Stabilitye e Limits D-Suffix, -40C to 85C Symbol DISCHARGE = -VIN = 0 V VCC = 10 V, +VIN = 48 V RBIAS = 820 k , ROSC = 910 k Tempb Minc Typd Maxc Unit VR ZOUT ISREF TREF OSC IN = VIN (OSC Disabled) RL = 10 M OSC IN = -VIN OSC IN = - VIN, VREF = -VIN OSC IN = -VIN t = 1000 hrs, TA = 125C Room Room Room Full Room 3.92 15 70 4.00 300 100 0.25 5.00 4.08 45 130 1.0 25.00 V k A mV/C mV Oscillator Maximum Frequencye Initial Accuracy Voltage Stability Temperature Coefficiente fMAX fOSC f/f TOSC ROSC = 0 See Note e f/f = f (13.5 V) - f (9.5 V)/f (9.5 V) Room Room Room Full 1 32 3 40 10 200 48 15 500 MHz kHz % ppm/C Error Amplifier Feedback Input Voltage Input BIAS Current Open Loop Voltage Gaine Input Offset Voltage Unity Gain Bandwidthe Dynamic Output Impedance Output Current Power Supply Rejection VFB IFB AVOL VOS BW ZOUT IOUT PSRR Source (VFB = 3.4 V) Sink (VFB = 4.5 V) 10 V VCC 13.5 V FB Tied to COMP OSC IN = -VIN (OSC Disabled) OSC IN = -VIN, VFB = 4 V OSC IN = -VIN (OSC Disabled) OSC IN = -VIN Room Room Room Room Room Room Room Room Room 0.05 0.5 60 3.96 4 25 80 15 0.8 1 -1.2 0.08 70 -0.32 40 4.04 500 V nA dB mV MHz k mA dB S-62188--Rev. A, 05-Apr-99 2 FaxBack 408-970-5600, request 70883 www.siliconix.com SI9108 New Product SPECIFICATIONSa Test Conditions Unless Otherwise Specified Parameter PWM Maximum Duty Cycle Dead Time Minimum Duty Cycle Minimum Pulse Width Before Pulse Drops Out DMIN DMAX Room Room Room Room 110 99.0 99.6 100 0 175 99.9 % ns % ns Vishay Siliconix Limits D-Suffix, -40C to 85C Symbol DISCHARGE = -VIN = 0 V VCC = 10 V, +VIN = 48 V RBIAS = 820 k , ROSC = 910 k Tempb Minc Typd Maxc Unit Current Limit Threshold Voltage Delay to Outpute Input Voltage Input Leakage Current Pre-Regulator Start-Up Current VCC Pre-Regulator Turn-Off Threshold Voltage Undervoltage Lockout VREG - VUVLO VSOURCE td +VIN +IIN ISTART VREG VUVLO VDELTA RL = 100 from DRAIN to VCC VFB = 0 V RL = 100 from DRAIN to VCC VSOURCE = 1.5 V, See Figure 1 IIN = 10 A VCC 10 V Pulse Width 300 s, VCC = 7 V IPRE-REGULATOR = 10 A RL = 100 from DRAIN to VCC See Detailed Description Room Room Room Room Room Room Room Room 8 7.5 7.0 0.25 15 9.3 8.7 0.5 9.7 9.2 V 120 10 0.8 1.0 200 1.2 300 V ns V A mA Supply Supply Current Bias Current SHUTDOWN Delay SHUTDOWN Pulse Width RESET Pulse Width Latching Pulse Width SHUTDOWN and RESET Low Input Low Voltage Input High Voltage Input Current Input Voltage High Input Current Input Voltage Low ICC IBIAS tSD tSW tRW tLW VIL VIH IIH IIL VIN = 10 V VIN = 0 V VSOURCE = -VIN, See Figure 2 See Figure 3 Room Room Room Room Room Room Room Room Room Room -35 8.0 1 -25 5 A 50 50 25 2.0 ns 0.35 7.5 50 100 0.5 mA A V FaxBack 408-970-5600, request 70883 www.siliconix.com S-62188--Rev. A, 05-Apr-99 3 SI9108 Vishay Siliconix SPECIFICATIONSa Test Conditions Unless Otherwise Specified Parameter MOSFET Switch Breakdown Voltage Drain-Source On Resistanceg Drain Off Leakage Current Drain Capacitance Notes a. Refer to PROCESS OPTION FLOWCHART for additional information. b. Room = 25C, Cold and Hot = as determined by the operating temperature suffix. c. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum, is used in this data sheet. d. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing. e. Guaranteed by design, not subject to production test. f. CSTRAY Pin 8 = 5 pF g. Temperature coefficient of rDS(on) is 0.75% per C, typical. V(BR)DSS rDS(on) IDSS CDS IDRAIN = 100 A IDRAIN = 100 mA VDRAIN = 100 V Full Room Room Room 35 200 220 5 7 10 V W A pF New Product Limits D-Suffix, -40C to 85C Symbol DISCHARGE = -VIN = 0 V VCC = 10 V, +VIN = 48 V RBIAS = 820 k , ROSC = 910 k Tempb Minc Typd Maxc Unit TIMING WAVEFORMS FIGURE 1. FIGURE 2. FIGURE 3. S-62188--Rev. A, 05-Apr-99 4 FaxBack 408-970-5600, request 70883 www.siliconix.com SI9108 New Product TYPICAL CHARACTERISTICS Vishay Siliconix FIGURE 4. PIN CONFIGURATIONS PIN DESCRIPTION Pin Number Function SOURCE -VIN VCC OSCOUT OSCIN DISCHARGE VREF SHUTDOWN RESET COMP FB BIAS +VIN DRAIN NC 14-Pin Plastic DIP 4 5 6 7 8 9 10 11 12 13 14 1 2 3 16-Pin SOIC 1 2 4 5 6 7 8 9 10 11 12 13 14 16 3, 15 20-Pin PLCC 7 8 9 10 11 12 14 16 17 18 20 2 3 5 1, 4, 6, 13, 15, 19 FaxBack 408-970-5600, request 70883 www.siliconix.com S-62188--Rev. A, 05-Apr-99 5 |
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