CS5661 Datasheet | Cherry Semiconductor Corporation

Description 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 ponents. This integrated circuit features a unique oscillator for precise duty cycle limit and frequency control, a temperature pensated reference, two high gain error amplifiers, two current sensing parators, 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 features consisting of input and reference undervoltage lockouts, each with hysteresis, cycle-by-cycle current limiting, and a latch for single pulse metering of each output. The CS5661 is pin patible with the MC34065L. Features s Oscillator has Precise Duty Cycle Limit and Frequency Control s 500k Hz Current Mode Operation s Automatic Feed Forward pensation 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 Block Diagram VREF 5.0V Ref VCC Undervoltage Lockout VREF Undervoltage Lockout SYNC CT RT Latching PWM 1 Oscillator VOUT1 + Sense1 Package Options 16 Lead SO Wide VFB1 - Error Amp 1 P1 ENABLE2 Latching PWM 2 VOUT2 SYNC 1 CT 2 RT 3 16 15 14 13 12 11 10 9 VCC VREF ENABLE2 VFB2 P2 SENSE2 VOUT2 Pwr Gnd VFB2 + - Error Amp 2 P2 Sense2 VFB1 4 P1 5 SENSE1 6 VOUT1 7 Gnd Pwr Gnd Gnd 8 Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: info@cherry-semi. Web Site: .cherry-semi. Rev. 2/2/99 ® pany Absolute Maximum Ratings Output Current, Source or Sink (Note 1)...