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MPZ2012S221A bảng dữ liệu(PDF) 34 Page - STMicroelectronics

tên linh kiện MPZ2012S221A
Giải thích chi tiết về linh kiện  38 V, 10 W synchronous iso-buck converter for isolated applications
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MPZ2012S221A bảng dữ liệu(HTML) 34 Page - STMicroelectronics

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9.4
Output External synchronization
The device allows a direct connection between a clock source and the EN/CLKIN pin.
Figure 41. External synchronization (direct connection)
VIN
VIN
EN/CLKIN
AGND
AGND
EP
VIN
GND
L6983I
FSW
RFSW1
VPP
The device internally implements a low-pass filter connected to the EN/CLKIN pin that is able to acquire the
average value of the applied signal.
The device turns on when the average of the signal applied is higher than VEN rising (refer toTable 6. Electrical
characteristics). The device turns off when the average of the signal should be lower than VEN falling (refer to
Table 6. Electrical characteristics). Considering, for example, a clock source with VPP = 5.0 V, the minimum duty
cycle to guarantee the power-up is given by:
Dutymin=VEN,Rising
VPP =0.24
(29)
The maximum duty cycle to guarantee the turn-off is given by:
DutyMAX=VEN,Falling
VPP =0.2
(30)
The device also allows the AC coupling.
L6983I
Output External synchronization
DS14040 - Rev 1
page 34/56



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