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L6730 数据表(PDF) 16 Page - STMicroelectronics |
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L6730 数据表(HTML) 16 Page - STMicroelectronics |
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16 / 52 page ![]() Device description L6730 - L6730B 16/52 5.6 Soft-start When both VCC and VIN are above their turn-on thresholds (VIN is monitored by the OCH pin) the start-up phase takes place. Otherwise the SS pin is internally shorted to GND. At start-up, a ramp is generated charging the external capacitor CSS with an internal current generator. The initial value for this current is 35µA and charges the capacitor up to 0.5V. After that it becomes 10µA until the final charge value of approximately 4V (see Figure 5.). Figure 7. Device start-up: Voltage at the SS pin. t t 0.5V 4V Vcc Vin Vss 4.2V 1.25V 4.2V or 8.6V 0.5V Vcc Vin 0.5V 1.25V Vss 4V |
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