MPZ2012S221A datasheet(35/56 Pages) STMICROELECTRONICS

部件名	MPZ2012S221A

功能描述	38 V, 10 W synchronous iso-buck converter for isolated applications

PDF	56 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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35 / 56 page

Figure 42. External synchronization (AC coupling)

VIN

EN/CLKIN

AGND

VIN

GND

L6983I

FSW

RFSW1

VPP

REN1

REN2

CEN

The AC-coupling allows the device to keep the power-up and down thresholds defined by the partition connected

to the EN/CLKIN pin and described in Section 9.3 Programmable power-up threshold.

The following table shows the minimum pulse duration for the external signal and maximum duty cycle that allows

the synchronization by keeping the selected power-up and down thresholds.

Table 8. External synchronization AC coupling suggested operation range

VPP [V]

TON,MIN, EXT Clock [ns]

DMAX, EXTClock [%]

2.3

3.3

The minimum amplitude for the external clock signal is, for both the configurations, equal to 2.3 V.

The network given by CEN and RENL sets a high-pass filter. Considering a resistor in the order of 220 KΩ, a

capacitor equal to 1 nF is a correct choice.

L6983I

Output External synchronization

DS14040 - Rev 1

page 35/56

MPZ2012S221A 数据表(PDF) 35 Page - STMicroelectronics