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L6730D Arkusz danych(PDF) 16 Page - STMicroelectronics

Numer części L6730D
Szczegółowy opis  Adjustable step-down controller with synchronous rectification
PDF  50 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6730D Arkusz danych(HTML) 16 Page - STMicroelectronics

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Device description
L6730C - L6730D
16/50
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 7.).
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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