L6722 datasheet(15/34 Pages) STMICROELECTRONICS

Part #	L6722

Description	3 Phase controller for DC/DC converters

PDF	34 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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15 / 34 page

L6722

5 Driver section

15/34

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Drivers' power is the power needed by the driver to continuously switch on and off the

external mosfets; it is a function of the switching frequency and total gate charge of the

selected mosfets. It can be quantified considering that the total power PSW dissipated to

switch the mosfets (easy calculable) is dissipated by three main factors: external gate

resistance (when present), intrinsic mosfet resistance and intrinsic driver resistance. This

last term is the important one to be determined to calculate the device power dissipation.

The total power dissipated to switch the mosfets results:

External gate resistors helps the device to dissipate the switching power since the same power

PSW will be shared between the internal driver impedance and the external resistor resulting in

a general cooling of the device.

GHS

BOOT

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GLS

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L6722 Datasheet(PDF) 15 Page - STMicroelectronics