L6732TR datasheet(19/36 Pages) STMICROELECTRONICS

No de pièce	L6732TR

Description	Adjustable step-down controller with synchronous rectification

PDF	36 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

Logo

19 / 36 page

L6732

Device description

19/36

To avoid a huge variation of the modulator gain, the best way to synchronize two or more

devices is to make them work at the same switching frequency and, in any case, the switching

frequencies can differ for a maximum of 50% of the lowest one. If, during synchronization

between two (or more) L6732, it's important to know in advance which the master is, it's timely

to set its switching frequency at least 15% higher than the slave. Using an external clock signal

(fEXT) to synchronize one or more devices that are working at a different switching frequency

(fSW) it is recommended to follow the below formula:

The phase shift between master and slaves is approximately 180°.

Figure 13. Synchronization: PWM Signal

Figure 14. Synchronization: Inductor currents

EXT

⋅

≤

(5)

L6732TR Fiches technique(PDF) 19 Page - STMicroelectronics