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L6983 датащи(PDF) 29 Page - STMicroelectronics

номер детали L6983
подробное описание детали  38 V, 3 A synchronous step-down converter with 17 μA quiescent current
PDF  63 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6983 датащи(HTML) 29 Page - STMicroelectronics

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8
Application notes
8.1
Programmable power up threshold
The enable rising threshold is equal to 1.2 V typical (refer to Table 6. Electrical characteristics). The power-up
threshold is adjusted according to the following equation:
VPower Up=1.2V∙ 1+REN HREN L
(28)
Figure 26. Leading network example
VIN
VIN
VINLDO
EN/CLKIN
FSW
VCC
AGND
AGND
GND
VIN
RFSW
CVCC
CIN
REN H
REN L
CFILT
RFILT
The enable falling threshold is equal to 1.0 V typical (refer to Table 6. Electrical characteristics). The turn
threshold is obtained according to the following equation:
VPower Up=1.0V∙ 1+REN HREN L
(29)
8.2
External synchronization (available for low noise mode only)
The device allows a direct connection between a clock source and the EN/CLKIN pin.
Figure 27. External synchronization. Direct connection.
VIN
VIN
VINLDO
EN/CLKIN
FSW
VCC
AGND
AGND
GND
VIN
RFSW
CVCC
CIN
Clock
Source
VPP
EXT. Clock(t)
CFILT
RFILT
The device internally implements a low-pass filter connected to EN/CLKIN pin that is able to acquire the average
value of the applied signal.
L6983
Application notes
DS13116 - Rev 1
page 29/63



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