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| www.fairchildsemi.com FAN7601 Features * * * * * * * * * Green Current Mode PWM Controller Description The FAN7601 is a green programmable frequency current mode PWM controller. It is specially designed for the off-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 voltage protection. 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. 10-SSOP 8-SOP 8-DIP Green Current Mode PWM Control Low Operating Current: Max 4mA Burst Mode Operation Internal High Voltage Start-up Switch Under Voltage Lockout (UVLO): 12V/8V Latch Protection & Soft Start Function Over Voltage Protection: 19V Operating Frequency up to 300kHz Max Duty Cycle: 95% Typical Applications * Off-Line Adapter Applications * Auxiliary Power Supplies 1 1 1 Internal Block Diagram Vref (10) 8 Vstr (1) 1 7 Vcc (8) 19V 5V Ref Rt/Ct 4 (5) OSC Vref 12uA Latch/SS 3 (4) Enable Start-up Circuit UVLO OVP + - + - 12V/8V 1.5V OVP SQ R 6 OUT (7) + - 2.5V SQ R Delay Circuit + - 0.97V/0.9V 2 CS/FB (3) 1V GND 5 (6) + - Start-up Circuit Reset Circuit + - - Latch/SS 1V * ( ) is 10-SSOP PIN Number Rev. 1.0.2 (c)2005 Fairchild Semiconductor Corporation FAN7601 Pin Assignments 8-DIP, 8-SOP Vref Vcc Out GND Vref NC 10-SSOP Vcc Out GND 8 7 6 5 10 9 8 7 6 FAN7601 YWW 1 Vstr 7601 YWW 1 Vstr 2 3 4 Rt/Ct 2 NC 3 4 5 CS/FB Latch/SS CS/FB Latch/SS Rt/Ct Pin Definitions Pin Number 1 (1) 2 (3) 3 (4) 4 (5) 5 (6) 6 (7) 7 (8) 8 (10) *( ) is 10-SSOP PIN Number Pin Name Vstr CS/FB Latch/SS Rt/Ct GND Out VCC Vref Start-up Pin Function Description Current Sense and Feedback Latch Protection and Soft Start Oscillator Timing Ground Gate Drive Output IC Power Supply Voltage Reference 2 FAN7601 Absolute Maximum Ratings (Ta = 25C, unless otherwise specified) Characteristics Supply Voltage Input Voltage CS/FB Operating Temperature Storage Temperature Junction Temperature Output Current Vstr Input Voltage ESD Capability, HBM Model (All pins except Vcc and Vstr) ESD Capability, Machine Model 8-DIP Thermal Resistance, Junction to Air 8-SOP 10-SSOP Rja Symbol VCC VCS/FB TOPR TSTG Tj IO Vstr Value 20 -0.3 to 20 -25 to +125 -55 to +150 150 250 500 2.0 300 100 180 130 C/W Unit V V C C C mA V kV V 3 FAN7601 Electrical Characteristics (Ta = -25C ~ 125C, Vcc = 14V, Rt = 9.5k, Ct = 2.2nF unless otherwise specified) Characteristics REFERENCE SECTION Reference Output Voltage Line Regulation Load Regulation OSCILLATOR SECTION Initial Accuracy Voltage Stability Amplitude PWM SECTION CS/FB Threshold Voltage1 Maximum Duty Cycle Minimum Duty Cycle BURST MODE SECTION CS/FB Threshold Voltage2(1) CS/FB Threshold Voltage3(1) SOFT START SECTION Soft Start Current Soft Start Limit Voltage Latch Voltage Over Voltage Protection UVLO SECTION Start Threshold Voltage Minimum Operating Voltage TOTAL CURRENT SECTION Operating Supply Current OUTPUT SECTION Low Output Voltage High Output Voltage Rising Time (1) Falling Time (1) START UP SECTION VSTR Start-up Current Istr Vstr = 30V, Ta =25C 0.5 1 1.5 mA VOL VOH Tr Tf Ta =25C, IO = 100mA Ta =25C, IO = -100mA Ta =25C, CI = 1nF Ta =25C, CI = 1nF 11.5 2 12 45 35 2.5 14 150 150 V V ns ns IOP 3 4 mA VtH VtL 11 7 12 8 13 9 V V (2) Symbol Vref Vref1 Vref2 FOSC STV VOCS VCS/FB1 DMAX DMIN VCS/FB2 VCS/FB3 ISS VSL VLATCH VOVP Conditions IO = 1mA VCC = 10V ~ 18V IO = 1mA ~ 10mA VCC = 10V ~ 18V Vpin4 peak-to-peak Ta = 25C Vpin3 = GND ISS = 1A - Min. 4.85 90 0.9 92 0.77 0.7 9 1.2 2.25 18 Typ. 5.00 10 20 100 1.0 1.25 1.0 95 0.97 0.9 12 1.5 2.5 19 Max. 5.15 20 30 110 1.5 1.1 98 0 1.17 1.1 15 1.8 2.75 20 Unit V mV mV kHz % V V % % V V A V V V PROTECTION SECTION Note: 1. These parameters, although guaranteed, are not 100% tested in production. 2. It is recommended to connect 1M resistor between the Latch/SS pin and GND to prevent abnormal operation of the latch protection by noise coupling. 4 FAN7601 Typical Performance Characteristics 5.15 3.0 5.10 Vref (V) 5.05 Supply Current Icc (mA) 2.8 2.6 5.00 2.4 4.95 4.90 2.2 4.85 -50 0 50 100 150 2.0 -50 0 50 100 150 Junction Tem perature (C) Junction Tem perature (C) Figure 1. Trimmed Reference Voltage Figure 2. Supply Current 13.0 9.0 Vcc Start Threshold VtH (V) Vcc Stop Threshold VtL (V) 12.5 8.5 12.0 8.0 11.5 7.5 11.0 7.0 -50 0 50 100 150 -50 0 50 100 150 Junction Tem perature (C) Junction Tem perature (C) Figure 3. Vcc Start Threshold Voltage Figure 4. Vcc Stop Threshold Voltage 110 100 Oscillator Frequency Fosc (kHz) Maximum Duty Cycle Dmax (%) -50 0 50 100 150 105 98 96 100 94 95 92 90 90 -50 0 50 100 150 Junction Tem perature (C) Junction Tem perature (C) Figure 5. Oscillator Frequency Figure 6. Maximum Duty Cycle 5 FAN7601 Typical Performance Characteristics (Continued) Oscillator High Threshold VrH (V) Oscillator Low Threshold VrL (V) 2.7 1.35 2.6 1.30 2.5 1.25 2.4 1.20 2.3 -50 0 50 100 150 1.15 -50 0 50 100 150 Junction Tem perature (C) Junction Tem perature (C) Figure 7. Oscillator High Threshold Voltage Figure 8. Oscillator Low Threshold Voltage 150 150 120 120 Rising Time Tr (ns) Falling Time Tf (ns) 90 90 60 60 30 30 0 0 -50 0 50 100 150 -50 0 50 100 150 Junction Tem perature (C) Junction Tem perature (C) Figure 9. Output Rising Time Figure 10. Output Falling Time 2.0 20.0 Start up Current Istr (mA) 1.6 Over Voltage Protection Vovp (V) -50 0 50 100 150 19.6 1.2 19.2 0.8 18.8 0.4 18.4 0.0 18.0 -50 0 50 100 150 Junction Tem perature (C) Junction Tem perature (C) Figure 11. Start-up Current Figure 12. Over Voltage Protection Level 6 FAN7601 Typical Performance Characteristics (Continued) 2.8 15 Soft Start Current Isoft (uA) Latch Protection Vlatch (V) 2.7 14 2.6 13 2.5 12 2.4 11 2.3 10 2.2 -50 0 50 100 150 9 -50 0 50 100 150 Junction Tem perature (C) Junction Tem perature (C) Figure 13. Latch Protection Voltage Figure 14. Soft Start Current 1000 Ct= 680pF 820pF 1nF 2.2nF 3.3nF 4.7nF 8.2nF 10nF Frequency (kHz) 100 10 1 0 10 20 30 40 50 Rt (k) Figure 15. Oscillator Frequency Characteristic 7 FAN7601 Mechanical Dimensions 8DIP 8 FAN7601 Mechanical Dimensions (Unit: mm) (Continued) Package 8-SOP MIN 1.55 0.20 0.061 0.008 0.1~0.25 0.004~0.001 #1 #8 4.92 0.20 0.194 0.008 5.13 MAX 0.202 ( #4 #5 6.00 0.30 0.236 0.012 +0.10 0.15 -0.05 +0.004 0.006 -0.002 0.56 ) 0.022 1.80 MAX 0.071 MAX0.10 MAX0.004 3.95 0.20 0.156 0.008 5.72 0.225 0.50 0.20 0.020 0.008 0~ 8 1.27 0.050 0.41 0.10 0.016 0.004 9 FAN7601 Mechanical Dimensions (Unit: mm) (Continued) Package 10-SSOP-225 10 FAN7601 Ordering Information Device FAN7601N FAN7601M FAN7601G Package 8-DIP 8-SOP 10-SSOP -25C ~ 125C Operating Temp. 11 FAN7601 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY 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. LIFE SUPPORT POLICY FAIRCHILD'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 systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. www.fairchildsemi.com 4/11/05 0.0m 001 Stock#DSxxxxxxxx 2005 Fairchild Semiconductor Corporation 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 effectiveness. |
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