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STR5A162D bảng dữ liệu(PDF) 10 Page - Sanken electric |
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STR5A162D bảng dữ liệu(HTML) 10 Page - Sanken electric |
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10 / 21 page  STR5A100D Series STR5A100D-DS Rev.1.2 SANKEN ELECTRIC CO.,LTD. 10 Dec. 25, 2013 VAC D P D/ST 1 2 U1 FB VDS R1 C3 R2 D1 D2 R3 R5 C1 CRD clamp snubber PSR circuit R6 VD C2 L1 R4 4 S/GND 5~8 Figure 10-5 FB pin peripheral circuit IDpk 0 ΔV F：Diode Dropped Voltage tON tOFF tON S P Dpk DOpk N N I I F OUT S D D V V N N V F S D Error V N N V OUT S D V N N tFBD Sampling set point A tFBMS D/ST pin current, ID Secondary side rectifier diode current, IDO Auxiliary winding voltage, VD Figure 10-6 Detection timing of auxiliary winding voltage 10.6 Constant Voltage (CV) Control The IC achieves the constant voltage (CV) control of the power supply output by using the peak-current-mode control method, which enhances the response speed and provides the stable operation. The IC controls the peak value of the voltage of build-in sense resistor (VROCP) to be close to target voltage (VSC), comparing VROCP with VSC by internal FB comparator. Feedback Control circuit receives the sampling voltage which is the reversed auxiliary winding voltage by using error amplifier (refer to Figure 10-7 and Figure 10-8) Light Load Conditions The FB pin voltage increases with the increase of the output voltage when the output load becomes light. Accordingly, the output voltage of internal error amplifier (target voltage VSC) decreases. As a result, the peak value of VROCP is controlled to be lower so that the peak of the drain current decreases. This control prevents the output voltage from increasing. Heavy Load Conditions The control circuit performs reverse operations to the former. The target voltage VSC of internal comparator becomes higher and the peak drain current increases. This control prevents the output voltage from decreasing. ROCP 5,6,7 1 2 S/GND FB VCC U1 VROCP D C4 R6 R3 R5 D2 4 D/ST - VSC + PWM Control R4 E/A - + FB comp Feedback Control S/H Figure 10-7 FB pin peripheral circuit VSC FB comparator Drain current, ID + - Voltage on both side of ROCP VROCP Figure 10-8 Drain current ID and FB comparator in steady operation 10.7 Constant Current (CC) Control The IC operates in Constant Current (CC) Control when output current reaches to constant load and the state continues for more than the Constant Current Control Delay Time, tCCD = 90 ms. In case the IC is in discontinuous operation, the CV/CC characteristic is as shown in Figure 10-9. When output current reaches to constant load, MOSFET drain current is limited to the Drain Current Limit IDLIM(H). When the output voltage becomes low, the CC Control is maintained by lowering the oscillation frequency fOSC. When the output voltage becomes low, the FB pin voltage becomes low. When FB pin voltage |
Số phần tương tự - STR5A162D |
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Mô tả tương tự - STR5A162D |
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