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L6730 Datasheet(PDF) 17 Page - STMicroelectronics |
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L6730 Datasheet(HTML) 17 Page - STMicroelectronics |
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17 / 52 page  L6730 - L6730B Device description Doc ID 11938 Rev 3 17/52 5.5 Error amplifier 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 35 µA and charges the capacitor up to 0.5 V. After that it becomes 10 µA until the final charge value of approximately 4 V (see Figure 5). Figure 7. Error amplifier reference 2.5V 100K EAREF VCCDR 0.6V 1.2V EXT Error Amplifier Ref. Figure 8. 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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