End of Life. Last Available Purchase Date is 31-Dec-2014 Si9112 Vishay Siliconix High-Voltage Switchmode Controller FEATURES 9- to 80-V Input Range High Efficiency Operation (> 80%) SHUTDOWN and RESET Current-Mode Control Internal Start-Up Circuit High-Speed, Source-Sink Output Drive Internal Oscillator (1 MHz) DESCRIPTION The Si9112 is a BiC/DMOS integrated circuit designed for use power. When combined with an output MOSFET and in high-efficiency switchmode power converters. A transformer, the Si9112 can be used to implement high-voltage DMOS input allows this controller to work over a single-ended power converter topologies (i.e., flyback, wide range of input voltages (9- to 80-VDC). Current-mode forward, and cuk). PWM control circuitry is implemented in CMOS to reduce internal power consumption to less than 10 mW. The Si9112 is available in both standard and lead (Pb)-free 14-pin plastic DIP and SOIC packages which are specified to operate over the industrial temperature range of 40 C to A CMOS output driver provides high-speed switching of MOSPOWER devices large enough to supply 50 W of output 85 C. FUNCTIONAL BLOCK DIAGRAM OSC OSC FB COMP DISCHARGE IN OUT 14 13 9 8 7 Error Amplifier OSC To V CC 10 1 Clock ( / f ) 2 OSC V + REF 4 V (2%) Current-Mode 2 V 4 Ref Comparator OUTPUT R Gen + Q 5 V IN S + C/L Comparator 1 Current To 1.2 V BIAS Sources Internal 3 SENSE Circuits V CC 6 V CC 11 SHUTDOWN 2 Undervoltage Comparator S +V IN Q 12 + 8.1 V RESET R + 8.7 V Pre-Regulator/Start-Up Applications information, see AN703. Document Number: 70005 www.vishay.com S-42036Rev. H, 15-Nov-04 1Si9112 Vishay Siliconix ABSOLUTE MAXIMUM RATINGS Voltages Referenced to V (V < +V + 0.3 V) Junction Temperature (T ) 150 C IN CC IN J Power Dissipation (Package)a V . 15 V CC b 14-Pin Plastic DIP (J Suffix) 750 mW +V 80 V IN c 14-Pin SOIC (Y Suffix) 900 mW Logic Inputs Thermal Impedance ( ) JA (RESET, SHUTDOWN, OSC IN) . 0.3 V to V + 0.3 V CC 14-Pin Plastic DIP . 167 C/W Linear Inputs (FEEDBACK, SENSE) 0.3 V to V + 0.3 V CC 14-Pin SOIC . 140 C/W HV Pre-Regulator Input Current (continuous) 25 mA (Power Dissipation Limited) Notes a. Device mounted with all leads soldered or welded to PC board. Storage Temperature 65 to 150 C b. Derate 6 mW/ C above 25 C. Operating Temperature . 40 to 85 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 V IN V . 9 V to 13.5 V R 25 k to 1 M CC OSC +V 9 V to 80 V Linear Inputs 0 to V 3 V IN CC f . 40 kHz to 1 MHz Digital Inputs . 0 to V OSC CC a SPECIFICATIONS Test Conditions Limits Unless Otherwise Specified D Suffix 40 to 85 C DISCHARGE DISCHARGE == VV = = 0 V0 V ININ V = 9 V, +V = 12 V CC IN b d c e Parameter Symbol Temp Min Typ Max Unit R = 270 k , R = 330 k BIAS OSC Reference OSC IN = V (OSC Disabled) Room 3.88 4.0 4.12 IN Output Voltage V V R e R = 10 M Full 3.82 4.14 L e Output Impedance Z Room 15 30 45 k OUT Short Circuit Current I V = V Room 70 100 130 A SREF REF IN e Temperature Stability T Full 0.5 1.0 mV/ C REF Oscillator e Maximum Frequency f R = 0 Room 1 3 MHz MAX OSC R = 330 k, See Note f Room 80 100 120 OSC Initial AccuracyInitial Accuracy ff kHzkHz OSOSCC R = 150 k, See Note f Room 160 200 240 OSC Voltage Stability f/f f/f = f(13.5 V) f(9.5 V) / f(9.5 V) Room 9 15 % e Temperature Coefficient T Full 200 500 ppm/ C OSC Error Amplifier FB Tied to COMP Feedback Input Voltage V Room 3.92 4.00 4.08 V FB OSC IN = V (OSC Disabled) IN Input Offset Voltage V OSC IN = V (OSC Disabled) Room 15 40 mV OS IN Input BIAS Current I OSC IN = V , V = 4 V Room 25 500 nA FB IN FB e Open Loop Voltage Gain A OSC IN = V Room 60 80 dB VOL IN e Unity Gain Bandwidth BW OSC IN = V (OSC Disabled) Room 1 1.5 MHz IN e Dynamic Output Impedance Z Error Amp Configured for 60 dB gain Room 1000 2000 OUT Source V = 3.4 V Room 2.0 1.4 FB Output CurrentOutput Current II mAmA OUOUTT Sink V = 4.5 V Room 0.12 0.15 FB e Power Supply Rejection PSRR 9 V V 13.5 V Room 50 70 dB CC Document Number: 70005 www.vishay.com S-42036Rev. H, 15-Nov-04 2