L6732_0906 datasheet(18/36 Pages) STMICROELECTRONICS

tên linh kiện	L6732_0906

Giải thích chi tiết về linh kiện	Adjustable step-down controller with synchronous rectification

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Device description

L6732

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5.9

HICCUP mode during an OCP

5.10

Thermal shutdown

When the junction temperature reaches 150°C ±10°C the device enters in thermal shutdown.

Both MOSFETs are turned off and the soft-start capacitor is rapidly discharged with an internal

switch. The device doesn't restart until the junction temperature goes down to 120°C and, in

any case, until the voltage at the soft-start pin reaches 500mV.

5.11

Synchronization

The presence of many converters on the same board can generate beating frequency noise. To

avoid this it is important to make them operate at the same switching frequency. Moreover, a

phase shift between different modules helps to minimize the RMS current on the common input

capacitors. Figure 13 and Figure 14 shows the results of two modules in synchronization. Two

or more devices can be synchronized simply connecting together the SYNCH pins. The device

with the higher switching frequency will be the Master while the other one will be the Slave. The

Slave controller will increase its switching frequency reducing the ramp amplitude proportionally

and then the modulator gain will be increased.

Figure 12. Constant current and Hiccup mode during an OCP.

VSS

VCOMP

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