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MOSFET (Si/SiC) Forum Discussions

Not applicable
I am searching for a proper MOSFET and I am really confused regarding IC start-up.

What is the Start-up procedure for IC start-up?
Please Help:)
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1 Solution
Not applicable
"Hi there,
For applications such as MOSFET/IGBT half-bridges, and
using the typical connection diagram (shown on the datasheet), the standard startup
procedure for the IC is as:
• Ensure that the correct bootstrap capacitor and diode components have
been selected as per design tip DT 98-2.
• Ensure that the VCC and VDD voltages are available, and within
specifications.
• Enable the high voltage supply (the DC bus).
• Apply the input signal to LIN. Accordingly, the LO will go high (after the
tON and tr times).
• When the low side switch turns on, the bootstrap capacitor can charge to
almost VCC (minus the [bootstrap diode drop + drop across the low side
www.irf.com AN-1092 14
switch/load]), within a given time duration (based on its capacitance and
the charging path impedance). In most cases, 100 µs to 200 µs should
suffice for this purpose.
• When the bootstrap capacitor is fully charged, the PWM signals may be
applied as per the required logic. "

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1 Reply
Not applicable
"Hi there,
For applications such as MOSFET/IGBT half-bridges, and
using the typical connection diagram (shown on the datasheet), the standard startup
procedure for the IC is as:
• Ensure that the correct bootstrap capacitor and diode components have
been selected as per design tip DT 98-2.
• Ensure that the VCC and VDD voltages are available, and within
specifications.
• Enable the high voltage supply (the DC bus).
• Apply the input signal to LIN. Accordingly, the LO will go high (after the
tON and tr times).
• When the low side switch turns on, the bootstrap capacitor can charge to
almost VCC (minus the [bootstrap diode drop + drop across the low side
www.irf.com AN-1092 14
switch/load]), within a given time duration (based on its capacitance and
the charging path impedance). In most cases, 100 µs to 200 µs should
suffice for this purpose.
• When the bootstrap capacitor is fully charged, the PWM signals may be
applied as per the required logic. "
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