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L7983 数据表(PDF) 17 Page - STMicroelectronics

部件名 L7983
功能描述  60 V, 300 mA synchronous step-down switching regulator with 10 μA quiescent current
PDF  43 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L7983 数据表(HTML) 17 Page - STMicroelectronics

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5.4
Enable and Reset
In order to maximize both the EN threshold accuracy and the current consumption, the device implements two
different enable thresholds:
•
The wake-up threshold, VWAKEUPH = 0.5 V typ.
•
The start-up threshold, VENH = 1.2 V typ.
As soon as the EN pin is detected above VWAKEUPH and VIN voltage is higher than VINH, the regulator turns on
the internal circuitry and waits for the VENH before starting the switching activity. When this occurs, the internal
voltage reference is increased by about 2 ms (typ.) in order to limit the inrush current and perform a smooth
output capacitor charge.
Figure 14. Turn-on example
L7983
Enable and Reset
DS13354 - Rev 1
page 17/43



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