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CS3972YTVA5 Datasheet(PDF) 1 Page - Cherry Semiconductor Corporation |
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CS3972YTVA5 Datasheet(HTML) 1 Page - Cherry Semiconductor Corporation |
1 / 6 page 1 Output Protection Driver 2.3V Reg Logic 40kHz OSC Error Amp - + 1.24V Ref Current Amp - + VSW VC VIN VFB 0.22Ω 0.22Ω COMP E1* E2* Gnd *Always connect E1 to Ground Pin on DIP package. Both emitters are tied to ground on TO-220 Package. 1.25A, 75V Switch - + 1.25A High Efficiency Switching Regulator CS3972 Description Block Diagram Features s 75VMAX, 2APEAK Internal Switch s 3V to 60V Input Voltage Range s 6mA Input Supply Current s 1.24V Precision Reference s 40kHz Switching Frequency s Variable Current Limit with External Voltage Clamp s Under-Voltage Protection s Over-Temperature Protection s External Synchronization Package Options 5L TO-220 Tab (Gnd) 8L PDIP 1 Gnd VC VFB NC E2 VSW E1 VIN 1 1VC 2VFB 3 Gnd 4VSW 5VIN 16L SO Wide 1 Gnd NC NC NC NC VIN E1 VSW E2 VC VFB NC NC NC NC NC The CS3972 is a 1.25A, 60V, current mode, high efficiency, switching regulator circuit. It can be config- ured in buck, boost, forward, iso- lated and non-isolated topologies, using a single-ended switch. The IC contains a 1.25A high effi- ciency output switch, precision bandgap reference, voltage regula- tor, error amplifier, oscillator, con- trol, and protection circuitry. Output transistor efficiency is achieved by keeping the switch in quasi-saturation when it is on. This minimizes the switch turn-off delay time and power dissipation, an important consideration for applications with wide ranging loads. The precision reference is internally trimmed to 1.24V, while the oscilla- tor frequency is internally trimmed to 40kHz. The on board 2.3V regu- lator powers the internal circuitry. By keeping the voltage regulator at 2.3V, the IC is able to operate down to 3V and maintain a constant input supply current of 6mA(typ). Synchronization mode is achieved by applying a pulsating VC voltage of less than 0.2V with a duration of about 0.5µs to VC pin. The switch- ing frequency can be adjusted from 50kHz to 70kHz. The IC's synchro- nization mode is set externally. Protection circuitry includes a vari- able current limit with external voltage clamp, under-voltage and over-temperature protection. Rev. 6/23/99 Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: info@cherry-semi.com Web Site: www.cherry-semi.com A Company ® |
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