FA_FAN7601

©2005 Fairchild Semiconductor CorporationFeatures•Green Current Mode PWM Control •Low Operating Current: Max 4mA •Burst Mode Operation•Internal High V oltage Start-up Switch •Under V oltage Lockout (UVLO): 12V/8V •Latch Protection & Soft Start Function •Over V oltage Protection: 19V•Operating Frequency up to 300kHz •Max Duty Cycle: 95%Typical Applications•Off-Line Adapter Applications •Auxiliary Power SuppliesDescriptionThe FAN7601 is a green programmable frequency current mode PWM controller. It is specially designed for theoff-line adapter application and the auxiliary power supplies which require high efficiency at a light load and no load. The internal high voltage start-up switch and the burst mode reduce the power loss. The FAN7601 includes some protections such as latch protection and over voltageprotection. The latch protection can be used for over voltage protection and/or thermal protection and so on. And the soft start prevents the output voltage over shoot at start up.8-SOP18-DIP110-SSOP1FAN7601Green Current Mode PWM ControllerFAN76012Pin AssignmentsPin Definitions*( ) is 10-SSOP PIN NumberPin NumberPin Name Pin Function Description1 (1)Vstr Start-up2 (3)CS/FB Current Sense and Feedback3 (4)Latch/SS Latch Protection and Soft Start4 (5)Rt/Ct Oscillator Timing5 (6)GND Ground6 (7)Out Gate Drive Output7 (8)V CC IC Power Supply8 (10)V refVoltage Reference8-DIP , 8-SOP10-SSOPFAN76013Absolute Maximum Ratings(Ta = 25°C, unless otherwise specified)Characteristics Symbol Value Unit Supply Voltage V CC 20V Input Voltage CS/FB V CS/FB -0.3 to 20V Operating Temperature T OPR -25 to +125°C Storage Temperature T STG -55 to +150°C Junction Temperature Tj 150°C Output Current I O 250mA Vstr Input VoltageVstr 500V ESD Capability, HBM Model (All pins except Vcc and Vstr)- 2.0kV ESD Capability, Machine Model-300VThermal Resistance, Junction to Air8-DIPR θja 100°C/W 8-SOP 18010-SSOP130FAN7601Electrical Characteristics(T a = -25°C ~ 125°C, Vcc = 14V, Rt = 9.5kΩ, Ct = 2.2nF unless otherwise specified)Characteristics Symbol Conditions Min.Typ.Max.Unit REFERENCE SECTIONReference Output Voltage V ref I O = 1mA 4.85 5.00 5.15V Line Regulation∆V ref1V CC = 10V ~ 18V-1020mV Load Regulation∆V ref2I O = 1mA ~ 10mA-2030mV OSCILLATOR SECTIONInitial Accuracy F OSC-90100110kHz Voltage Stability ST V V CC = 10V ~ 18V- 1.0 1.5% Amplitude V OCS V pin4 peak-to-peak- 1.25-V PWM SECTIONCS/FB Threshold Voltage1V CS/FB1-0.9 1.0 1.1V Maximum Duty Cycle D MAX Ta = 25°C929598% Minimum Duty Cycle D MIN---0% BURST MODE SECTIONCS/FB Threshold Voltage2(1)V CS/FB2-0.770.97 1.17V CS/FB Threshold Voltage3(1)V CS/FB3-0.70.9 1.1V SOFT START SECTIONSoft Start Current I SS V pin3 = GND91215µA Soft Start Limit Voltage(2)V SL I SS = 1µA 1.2 1.5 1.8V PROTECTION SECTIONLatch Voltage V LATCH- 2.25 2.5 2.75V Over Voltage Protection V OVP-181920V UVLO SECTIONStart Threshold Voltage V tH-111213V Minimum Operating Voltage V tL-789V TOTAL CURRENT SECTIONOperating Supply Current I OP--34mA OUTPUT SECTIONLow Output Voltage V OL Ta =25°C, I O = 100mA-2 2.5V High Output Voltage V OH Ta =25°C, I O = -100mA11.51214V Rising Time (1)T r Ta =25°C, CI = 1nF-45150ns Falling Time (1)T f Ta =25°C, CI = 1nF-35150ns START UP SECTIONVSTR Start-up Current I str V str = 30V, Ta =25°C0.51 1.5mANote:1. These parameters, although guaranteed, are not 100% tested in production.2. It is recommended to connect 1MΩ resistor between the Latch/SS pin and GND to prevent abnormal operation of the latchprotection by noise coupling.4FAN76015Typical Performance CharacteristicsFigure 1. Trimmed Reference VoltageFigure 2. Supply CurrentFigure 3. Vcc Start Threshold VoltageFigure 4. Vcc Stop Threshold VoltageFigure 5. Oscillator Frequency Figure 6. Maximum Duty CycleFAN76016Typical Performance Characteristics (Continued)Figure 8. Oscillator Low Threshold VoltageFigure 9. Output Rising TimeFigure 11. Start-up CurrentFigure 7. Oscillator High Threshold VoltageFigure 12. Over Voltage Protection LevelFigure 10. Output Falling TimeFAN76017Typical Performance Characteristics (Continued)Figure 14. Soft Start CurrentFigure 13. Latch Protection Voltage Figure 15. Oscillator Frequency CharacteristicFAN7601Mechanical Dimensions8DIP8FAN7601 Mechanical Dimensions (Unit: mm) (Continued)Package8-SOP9FAN7601Mechanical Dimensions (Unit: mm) (Continued) Package10-SSOP-22510FAN760111Ordering Information DevicePackage Operating Temp.FAN7601N8-DIP -25°C ~ 125°C FAN7601M8-SOP FAN7601G 10-SSOPFAN76014/11/05 0.0m 001Stock#DSxxxxxxxx2005 Fairchild Semiconductor Corporation LIFE SUPPORT POLICYFAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:1.Life support devices or systems are devices or systemswhich, (a) are intended for surgical implant into the body,or (b) support or sustain life, and (c) whose failure toperform when properly used in accordance withinstructions for use provided in the labeling, can bereasonably expected to result in a significant injury of theuser.2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or DISCLAIMERFAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANYLIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.。