End of Life. Last Available Purchase Date is 31-Dec-2014 Si9120 Vishay Siliconix Universal Input Switchmode Controller FEATURES 10- to 450-V Input Range 125-mA Output Drive Internal Oscillator (1 MHz) Current-Mode Control Internal Start-Up Circuit SHUTDOWN and RESET DESCRIPTION The Si9120 is a BiC/DMOS integrated circuit designed for use to supply 30 W of output power at 100 kHz. These devices, in low-power, high-efficiency off-line power supplies. when combined with an output MOSFET and transformer, can High-voltage DMOS inputs allow the controller to work over a be used to implement single-ended power converter wide range of input voltages (10- to 450-VDC). Current-mode topologies (i.e., flyback and forward). PWM control circuitry is implemented in CMOS to reduce quiescent current to less than 1.5 mA. The Si9120 is available in both standard and lead (Pb)-free 16-pin plastic DIP and SOIC packages which are specified to A CMOS output driver provides high-speed switching for operate over the industrial temperature range of 40 C to MOSFET devices with gate charge, Q , up to 25 nC, enough 85 C. g FUNCTIONAL BLOCK DIAGRAM OSC OSC FB COMP DISCHARGE IN OUT 15 14 10 9 8 Error Amplifier OSC To V 11 CC 1 Clock ( / f ) V + 2 OSC REF 2 V Current-Mode 4 V (1%) Comparator R + Q 5 Ref OUTPUT S Gen 6 + V IN C/L Comparator 1.2 V 16 Current To BIAS Sources Internal 4 SENSE Circuits V CC 7 V CC 12 SHUTDOWN 1 Undervoltage Comparator S +V IN Q 13 + 8.1 V RESET R + 8.6 V Pre-Regulator/Start-Up Applications information, see AN707 and AN708. Document Number: 70006 www.vishay.com S-42042Rev. H, 15-Nov-04 1Si9120 Vishay Siliconix ABSOLUTE MAXIMUM RATINGS b Voltages Referenced to V (Note: V < +V + 0.3 V) Power Dissipation (Package) IN CC IN c V . 15 V 16-Pin Plastic DIP (J Suffix) 750 mW CC d +V . 450 V IN 16-Pin SOIC (Y Suffix) 900 mW Logic Inputs (RESET Thermal Impedance ( ) JA SHUTDOWN, OSC IN, OSC OUT) . 0.3 V to V + 0.3 V CC 16-Pin Plastic DIP . 167 C/W Linear Input 16-Pin SOIC . 140 C/W (FEEDBACK, SENSE, BIAS, V ) 0.3 V to 7 V REF a HV Pre-Regulator Input Current (continuous) 5 mA Notes Continuous Output Current (Source or Sink) . 125 mA a. Continuous current may be limited by the applications maximum input voltage and the package power dissipation. Storage Temperature 65 to 150 C b. Device mounted with all leads soldered or welded to PC board. Operating Temperature . 40 to 85 C c. Derate 6 mW/ C above 25 C. Junction Temperature (T ) 150 C d. Derate 7.2 mW/ C above 25 C. J 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 9.5 V to 13.5 V 25 k to 1 M R CC OSC +V 10 V to 450 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 LIMITS Specific Test Conditions D Suffix 40 to 85 C DISCHARGEDISCHARGE = = VV = 0 V = 0 V,, ININ V = 10 V +V = 300 V CC IN B C D C Parameter Symbol Unit R = 390 k , R = 330 k TEMP MIN TYP MAX BIAS OSC Reference OSC IN = V (OSC Disabled) Room 3.88 4.0 4.12 IN Output Voltage V V R 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 C Pin 9 5 pF STRAY Room 80 100 120 R = 330 k OSC Initial AccuracyInitial Accuracy ff kHzkHz OSOSCC C Pin 9 5 pF STRAY Room 160 200 240 R = 150 k OSC Voltage Stability f/f f/f = f(13.5 V) f(9.5 V) / f(9.5 V) Room 10 15 % e Temperature Coefficient T Full 200 500 ppm/ C OSC Error Amplifier FB Tied to COMP Feedback Input Voltage V Room 3.92 4.08 V FB OSC IN = V (OSC Disabled) IN Input BIAS Current I OSC IN = V , V = 4 V Room 25 500 nA FB IN FB Input OFFSET Voltage V OSC IN = V Room 15 40 mV OS IN e Open Loop Voltage Gain A OSC IN = V Room 60 80 dB VOL IN e Unity Gain Bandwidth BW OSC IN = V Room 1.0 1.5 MHz IN Document Number: 70006 www.vishay.com S-42042Rev. H, 15-Nov-04 2