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CS3972YDW16 датащи(PDF) 4 Page - Cherry Semiconductor Corporation |
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CS3972YDW16 датащи(HTML) 4 Page - Cherry Semiconductor Corporation |
4 / 6 page The CS3972 has an on board, high current NPN transistor in its output stage. The output transistor is switched on every 25µs by the on board 40 kHz oscillator. The output is switched off as soon as the output current reaches a dynamically controlled level. That level is determined by three factors: the current drawn by the load, the input voltage, and the output voltage. This control scheme has several benefits. The IC reacts quickly to overvoltage and short circuit conditions and it is less sensitive to input voltage fluctuation. Current drawn by the load influences when the output stage turns off. The voltage across the internal high preci- sion resistor (0.11Ω) in the emitter of the output transistor generating the input to the current sensing amplifier. The output of the current sensing amplifier provides one of the inputs to the comparator. The other input to the comparator connected to the out- put of the error amplifier whose inverting input is con- nected to the output voltage through the feedback circuit- ry while its noninverting input is set to an internal refer- ence voltage of 1.24V. When the current sensing amplifier output exceeds the error amplifier output, the comparator switches off, triggering the logic which turns off the out- put stage. All on board amplifier, logic and protection circuitry uses the internal 2.3V reference to minimize quiescent current drain (6mA) and permits IC operation down to 3V. The anti-saturation circuitry minimizes output switch turn off time and power dissipation, by keeping the power NPN at the edge of saturation. 4 Circuit Description Application Diagrams VIN D1 C1 + R1 C2 R3 C3 (1.24V) R2 VOUT VIN VC Gnd VFB VSW CS3972 L1 + VIN Q1 R1 C1 + R2 C2 D1 R4 C3 (1.24V) R3 VOUT VIN VC Gnd VFB VSW CS3972 L1 + VIN TR1 R1 C2 + R2 C3 R5 (1.24V) R4 VOUT1 VIN VC Gnd VFB VSW CS3972 C4 C1 C5 + C6 + VOUT2 +VIN TR1 C2 + R2 C3 R7 R5 VOUT VIN VC Gnd VFB VSW CS3972 C3 + C5 L1 D2 D1 R4 1/2 OC1 R6 C4 U1 R3 D1 R1 –VIN D3 1/2 OC1 Figure 1: Boost Regulator Figure 2: Buck Regulator with the External Switch Figure 3: Flyback Multiple Output Regulator Figure 4: Isolated Forward Regulator |
Аналогичный номер детали - CS3972YDW16 |
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Аналогичное описание - CS3972YDW16 |
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