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FAN7601G
www.fairchildsemi.com FAN7601 Green Current Mode PWM Controller Features 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. 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 10-SSOP • Off-Line Adapter Applications • Auxiliary Power Supplies 8-DIP 8-SOP 1 1 1 Internal Block Diagram Vref (10) 8 Vstr (1) 1 5V Ref Rt/Ct 4 (5) Enable OSC UVLO Vref + − OVP Start-up Circuit + − 7 Vcc (8) 19V 12V/8V 12uA Latch/SS 3 (4) 1.5V S Q R 6 OUT (7) 2 CS/FB (3) OVP + − S Q R 2.5V 1V + − Start-up Circuit GND 5 (6) Reset Circuit + − Delay Circuit 0.97V/0.9V + − − Latch/SS 1V * ( ) is 10-SSOP PIN Number Rev. 1.0.2 ©2005 Fairchild Semiconductor Corporation
FAIRCHILD
Fairchild Semiconductor International, Inc
U.S.A
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