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MV1001SC Datasheet(PDF) 8 Page - Shindengen Electric Mfg.Co.Ltd |
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MV1001SC Datasheet(HTML) 8 Page - Shindengen Electric Mfg.Co.Ltd |
8 / 35 page ![]() MV1001SC 7 2.1 Starting sequence The MV1001SC can provide an internal power supply from the high-voltage start circuit in the Vin pin. The IC starts up when a voltage equal to or exceeding the starting voltage (Vcc_start). To ensure stable operations, the signal should be sent to the REF pin when the Vcc voltage is equal to or greater than the Vcc_start. Figure 3 shows an example of a starting operation in the Vcc->REF sequence, using the circuit configuration shown in Figure 1. In a normal start operation, oscillations start when the Vcc voltage reaches Vcc_start. As the output voltage rises, the Svin voltage crosses the Svout voltage, enabling zero current detection. (Figure 3(a) Starting operation OK) When it is difficult to charge the output capacitor—for instance, when the resistance of the gate resistor R4 is large or when the resistance of a dummy resistor connected in parallel with LED is small—the output voltage may not rise after oscillation has started and zero current detection may be disabled. When zero current detection cannot be performed, the IC is forcibly switched over to the restart operation, in which the minimum on-time and maximum off-time are used, instead of the normal peak current detection operation. When zero current detection is left disabled, the restart operation continues and LED will not light. (Figure 3(b) Starting operation NG) Be sure to measure the Svin and Svout voltages at the start of the actual apparatus to confirm that zero current detection is enabled. Figure 3(a) Starting operation OK Figure 3(b) Starting operation NG Vi Vcc Svout Svin Vcc_start=7.2V Vo Io Gate Svin Svout IL REF Vth_REF CAT.No.1A0102-1E |
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