FAN7601B Green Current Mode PWM Controller Features Description The FAN7601B is a programmable frequency green current mode PWM controller. It is specially designed for the offline adapter applications and the auxiliary power supplies that require high efficiency at light load and no load. The internal high-voltage startup switch and burst mode reduce the power loss. Green Current Mode PWM Control Low Operating Current: Maximum 4mA Burst Mode Operation Internal High-Voltage Startup Switch Under-Voltage Lockout (UVLO): 12V/8V Latch Protection and Soft-Start Function Over-Voltage Protection: 19V Operating Frequency up to 300kHz Maximum Duty Cycle: 95% Applications FAN7601B includes protections, such as latch protection and over-voltage protection. The latch protection can be used for over-voltage protection, thermal protection, and others. The soft-start prevents the output voltage overshoot at startup. Offline Adapter Applications Auxiliary Power Supplies Related Resources AN4129 — Green Current Mode PWM Controller FAN7601 Ordering Information Part Number Operating Junction Temperature FAN7601BM FAN7601BMX FAN7601BGX © 2008 Fairchild Semiconductor Corporation FAN7601B • Rev. 1.0.3 -40°C to +150°C Top Mark Package Packing Method 7601B 8-SOP Rail 7601B 8-SOP Tape & Reel 7601B 10-SSOP Tape & Reel www.fairchildsemi.com FAN7601B — Green Current Mode PWM Controller May 2012 VREF (10) 8 VSTR (1) 1 7 5V Ref Rt/Ct (5) 4 Enable + − OVP Startup Circuit VCC (8) 19V OSC UVLO VREF + − 12V/8V 12µA Latch/SS 3 (4) 1.5V S Q R 6 OUT (7) OVP + − S Q R 2.5V 1V GND (6) + − Startup Circuit + − Delay Circuit Reset Circuit + − − 5 2 CS/FB (3) 0.97V/0.9V Latch/SS 1V Figure 1. Internal Block Diagram Note: 1. ( ) is 10-SSOP Pin Number. © 2008 Fairchild Semiconductor Corporation FAN7601B • Rev.1.0.3 www.fairchildsemi.com 2 FAN7601B — Green Current Mode PWM Controller Block Diagram Figure 2. 8-Pin Configuration (Top View) Figure 3. 10-Pin Configuration (Top View) Pin Definitions Pin # (8-Pin) Pin # (10-Pin) Name 1 1 VSTR 2 3 CS/FB 3 4 Latch/SS 4 5 Rt/Ct Oscillator Timing 5 6 GND Ground 6 7 Out Gate Drive Output 7 8 VCC IC Power Supply 8 10 VREF Voltage Reference © 2008 Fairchild Semiconductor Corporation FAN7601B • Rev.1.0.3 Description Startup Current Sense and Feedback Latch Protection and Soft-Start www.fairchildsemi.com 3 FAN7601B — Green Current Mode PWM Controller Pin Configurations Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol VCC Parameter Min. Max. Unit 20 V VCS/FB Input Voltage CS/FB -0.3 20.0 V TSTG Storage Temperature -55 +150 °C Recommended Operating Junction Temperature -40 +150 °C TJ IO Supply Voltage Output Current 250 mA VSTR VSTR Input Voltage 500 V ESD Electrostatic Discharge Capability Human Body Model, JESD22-A114 2000 Charged Device Model, JESD22-C101 1500 V Thermal Impedance Symbol θJA Parameter Thermal Resistance, Junction-to-Ambient © 2008 Fairchild Semiconductor Corporation FAN7601B • Rev.1.0.3 Value 8-SOP 180 10-SSOP 130 Unit °C/W www.fairchildsemi.com 4 FAN7601B — Green Current Mode PWM Controller Absolute Maximum Ratings TA=-25°C~125°C, VCC=14V, RT=9.5kΩ, CT=2.2nF unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Unit 4.85 5.00 5.15 V Reference Section VREF Reference Output Voltage IO=1mA ΔVREF1 Line Regulation VCC=10V~18V 10 20 mV ΔVREF2 Load Regulation IO=1mA ~ 10mA 20 30 mV 100 110 kHz 1.5 % Oscillator Section fOSC Initial Accuracy 90 STV Voltage Stability VCC=10V~18V 1.0 VOSC Amplitude Vpin4 peak-to-peak 1.25 V PWM Section VCS/FB1 CS/FB Threshold Voltage1 DMAX Maximum Duty Cycle DMIN Minimum Duty Cycle TA=25°C 0.9 1.0 1.1 V 92 95 98 % 0 % Burst Mode Section VCS/FB2 CS/FB Threshold Voltage2(2) VCS/FB3 (2) CS/FB Threshold Voltage3 0.77 0.97 1.17 V 0.7 0.9 1.1 V 9 12 15 μA 1.2 1.5 1.8 V 2.25 2.50 2.75 V 18 19 20 V Soft-Start Section ISS VSL Soft-Start Current Vpin3=GND (3) Soft-Start Limit Voltage ISS=1μA Protection Section VLATCH VOVP Latch Voltage Over-Voltage Protection UVLO Section VtH Start Threshold Voltage 11 12 13 V VtL Minimum Operating Voltage 7 8 9 V 3 4 mA 2.0 2.5 V 12.0 14.0 V TA=25°C, CI=1nF 45 150 ns TA=25°C, CI=1nF 35 150 ns 1.0 1.5 mA Total Current Section IOP Operating Supply Current Output Section VOL Low Output Voltage TA=25°C, IO=100mA VOH High Output Voltage TA=25°C, IO=-100mA (2) tr Rising Time tf Falling Time(2) 11.5 Startup Section Istr VSTR Startup Current VSTR=30V, TA=25°C 0.5 Notes: 2. These parameters, although guaranteed, are not 100% tested in production. 3. It is recommended to connect a 1MΩ resistor between the Latch/SS pin and GND to prevent abnormal operation of the latch protection by noise coupling. © 2008 Fairchild Semiconductor Corporation FAN7601B • Rev.1.0.3 www.fairchildsemi.com 5 FAN7601B — Green Current Mode PWM Controller Electrical Characteristics 3 5.03 2.5 Supply Cur r ent I cc (mA) Vref (V) 5.05 5.01 2 1.5 4.99 4.97 1 0.5 0 4.95 -45 -25 -15 0 25 50 -45 -25 -15 80 100 125 140 Figure 4. Trimmed Reference Voltage Vcc Stop Thr eshold VtL (V) Vcc Star t Thr eshold VtH (V) 50 80 100 125 140 9 12.5 12 11.5 11 10.5 10 -45 -25 -15 0 25 50 8.5 8 7.5 7 -45 -25 -15 80 100 125 140 0 25 50 80 100 125 140 Junction Temperature(℃) Junction Temperature(℃) Figure 6. VCC Start Threshold Voltage Figure 7. VCC Stop Threshold Voltage 110 100 Maximum Duty Cycle Dmax (%) Oscillator Frequency Fosc (KHz) 25 Figure 5. Supply Current 13 105 100 95 90 85 -45 -25 -15 0 25 50 80 98 96 94 92 90 -45 -25 -15 100 125 140 0 25 50 80 100 125 140 Junction Temperature(℃) Junction Temperature(℃) Figure 8. Oscillator Frequency Figure 9. Maximum Duty Cycle 1.35 O scillator L ow Thr eshold Vr L (V) 2.7 O scillator High Thr eshold Vr H (V) 0 Junction Temperature(℃) Junction Temperature(℃) 2.6 2.5 2.4 2.3 -45 -25 -15 0 25 50 80 1.25 1.2 1.15 -45 -25 -15 100 125 140 0 25 50 80 100 125 140 Junction Temperature(℃) Junction Temperature(℃) Figure 10. Oscillator High Threshold Voltage © 2008 Fairchild Semiconductor Corporation FAN7601B • Rev.1.0.3 1.3 Figure 11. Oscillator Low Threshold Voltage www.fairchildsemi.com 6 FAN7601B — Green Current Mode PWM Controller Typical Performance Characteristics 20 Over Voltage Protection Vovp (V) Star t up Cur r ent Istr (mA) 2 1.6 1.2 0.8 0.4 0 -45 -25 -15 0 25 50 80 100 125 140 Junction Temperature(℃) 19.2 18.8 18.4 18 -45 -25 -15 0 25 50 80 100 125 140 Junction Temperature(℃) Figure 12. Startup Current Figure 13. Over-Voltage Protection Level 2.8 14 2.7 Soft Start Curren t Isof (uA) Latch Protection Vlatch ( V) 19.6 2.6 2.5 2.4 2.3 13 12 11 10 9 2.2 -45 -25 -15 0 25 50 80 100 125 140 Junction Temperature(℃) -45 -25 -15 0 25 50 80 100 125 140 Junction Temperature( ℃) Figure 14. Latch Protection Voltage Figure 15. Soft-Start Current 1000 Ct= Frequen cy[KHz] 10nF 8.2nF 100 4.7nF 3.3nF 2.2nF 1nF 820pF 10 680pF 1 5K 15K 25K Rt[Kohm] 35K 45K Figure 16. Oscillator Frequency Characteristic © 2008 Fairchild Semiconductor Corporation FAN7601B • Rev.1.0.3 www.fairchildsemi.com 7 FAN7601B — Green Current Mode PWM Controller Typical Performance Characteristics (Continued) 5.00 4.80 A 0.65 3.81 8 5 B 6.20 5.80 PIN ONE INDICATOR 1.75 4.00 3.80 1 5.60 4 1.27 (0.33) 0.25 M 1.27 C B A LAND PATTERN RECOMMENDATION SEE DETAIL A 0.25 0.10 1.75 MAX 0.25 0.19 C 0.10 0.51 0.33 0.50 x 45° 0.25 R0.10 C OPTION A - BEVEL EDGE GAGE PLANE R0.10 OPTION B - NO BEVEL EDGE 0.36 NOTES: UNLESS OTHERWISE SPECIFIED 8° 0° 0.90 0.406 A) THIS PACKAGE CONFORMS TO JEDEC MS-012, VARIATION AA, ISSUE C, B) ALL DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS DO NOT INCLUDE MOLD FLASH OR BURRS. D) LANDPATTERN STANDARD: SOIC127P600X175-8M. E) DRAWING FILENAME: M08AREV13 SEATING PLANE (1.04) DETAIL A SCALE: 2:1 Figure 17. 8-Lead, Small Outline Package (SOP) Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2008 Fairchild Semiconductor Corporation FAN7601B • Rev.1.0.3 www.fairchildsemi.com 8 FAN7601B — Green Current Mode PWM Controller Physical Dimensions 5.12 4.72 0.65 4.00 10 6 1.75 6.30 5.70 5 (1.00) #1 PIN ONE INDICATOR 5.60 4.15 3.75 #1 TOP VIEW (1.00) LAND PATTERN RECOMMENDATION SEE DETAIL A R0.20 0.30 0.15 1.80 MAX 0.25 0.10 (0.26) 0.506 0.306 SIDE VIEW END VIEW R0.15 GAGE PLANE R0.15 NOTES: A) NO DRAWING STANDARD APPLIES TO THIS PACKAGE B) ALL DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS ARE EXCLUSIVE OF BURRS, MOLD FLASH, AND TIE BAR EXTRUSIONS. 0.70 D) LAND PATTERN RECOMMENDATION IS FSC SOURCED. E) DRAWING FILE NAME AND REVISION : MKT-MSB10A,REV1 0.30 (0.36) 8¡Æ SEATING PLANE (2.04) DETAIL A SCALE: 2:1 Figure 18. 10-Lead, Small Outline Package (SSOP) Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2008 Fairchild Semiconductor Corporation FAN7601B • Rev.1.0.3 www.fairchildsemi.com 9 FAN7601B — Green Current Mode PWM Controller Physical Dimensions FAN7601B — Green Current Mode PWM Controller © 2008 Fairchild Semiconductor Corporation FAN7601B • Rev.1.0.3 www.fairchildsemi.com 10