MPZ2012S221A datasheet(34/56 Pages) STMICROELECTRONICS

Part #	MPZ2012S221A

Description	38 V, 10 W synchronous iso-buck converter for isolated applications

PDF	56 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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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

EN/CLKIN

AGND

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

MPZ2012S221A Datasheet(PDF) 34 Page - STMicroelectronics