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CS5661EDWR16 Datasheet(PDF) 1 Page - ON Semiconductor |
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CS5661EDWR16 Datasheet(HTML) 1 Page - ON Semiconductor |
1 / 8 page 1 Features s Oscillator has Precise Duty Cycle Limit and Frequency Control s 500kHz Current Mode Operation s Automatic Feed Forward Compensation s Separate Latching PWMs for Cycle-By-Cycle Current Limiting s Internally Trimmed Reference with Undervoltage Lockout s Switchable Second Output s Two High Current Totem Pole Outputs s Input Undervoltage Lockout with Hysteresis s 8.4V Start Up Voltage Threshold Package Options 16 Lead SO Wide High Performance Dual Channel Current Mode Controller with ENABLE 1 SYNC 2 3 4 5 6 7 8 CT RT VFB 1 COMP1 SENSE1 VOUT 1 Gnd 16 15 14 13 12 11 10 9 VCC VREF ENABLE2 VFB 2 COMP2 SENSE2 VOUT 2 Pwr Gnd CS5661 Description Block Diagram December, 2001 - Rev. 3 ON Semiconductor 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885–3600 Fax: (401)885–5786 N. American Technical Support: 800-282-9855 Web Site: www.cherry–semi.com The CS5661 is a high performance, fixed frequency, dual current mode controller specifically designed for Off-Line and DC to DC converter applications. It offers the designer a cost effective solution with minimal external components. This integrat- ed circuit features a unique oscilla- tor for precise duty cycle limit and frequency control, a temperature compensated reference, two high gain error amplifiers, two current sensing comparators, and two high current totem pole outputs ideally suited for driving power MOSFETs. VOUT2 output is switchable via the ENABLE2 pin. Also included are protective fea- tures consisting of input and refer- ence undervoltage lockouts, each with hysteresis, cycle-by-cycle cur- rent limiting, and a latch for single pulse metering of each output. The CS5661 is pin compatible with the MC34065L. + - + - VREF SYNC Oscillator Error Amp 1 Error Amp 2 Latching PWM 2 Latching PWM 1 VREF Undervoltage Lockout 5.0V Ref VCC Undervoltage Lockout VCC VFB 1 COMP1 ENABLE2 VFB 2 COMP2 CT RT Gnd Pwr Gnd Sense2 VOUT 2 Sense1 VOUT 1 |
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