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AN4354 Datasheet(PDF) 5 Page - STMicroelectronics

Part # AN4354
Description  This document describes the operation of the gate driving circuitry which
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4354 Datasheet(HTML) 5 Page - STMicroelectronics

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5/14
AN4354
Gate driving circuitry
14
1.1
Advantages of constant current driving of the MOSFET gates
The L648x gate drivers, thanks to the possibility to drive the MOSFET gates using
a programmable constant current, have two main advantages:
1.
The slew rate of the power stage is controlled allowing a precise EMI management.
2.
No gate resistors are required reducing the number of components in the bill of
material.
The output slew rate depends on how fast the MOSFET gate is charged in the Miller plateau
region. In a classic gate driver the charging/discharging current is adjusted adding a resistor
between the gate driver output and the MOSFET gate (see Figure 3). This way the output
slew rate can be limited, but its value depends on the load current (the plateau voltage
changes with the drain current).
Using a true current generator, the L648x gate driver forces a constant gate current during
the entire plateau region regardless of the load current.
Figure 3. Classic gate driver circuit vs. L648x gate driver
1.2
Turn-on sequence
When one of the external MOSFET must be turned-on the gate driving circuitry disables the
respective Miller clamp switch and starts forcing the programmed current into the gate. After
the controlled current time expires, the high-side and the low-side drivers act differently: the
low-side drivers do not limit the gate current; the high-side ones instead limit the gate
current to about 1 mA (see Figure 4).


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