1

10

100

1000

SWITCHING FREQUENCY (kHz)

0.001

0.010

0.100

LM5100A, LM5100B, LM5100C, LM5101A, LM5101B, LM5101C

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SNOSAW2P – SEPTEMBER 2006 – REVISED MARCH 2013

The bootstrap diode power loss is the sum of the forward bias power loss that occurs while charging the

bootstrap capacitor and the reverse bias power loss that occurs during reverse recovery. Since each of these

events happens once per cycle, the diode power loss is proportional to frequency. Larger capacitive loads

the half bridge result in higher reverse recovery losses. The following plot was generated based on calculations

and lab measurements of the diode recovery time and current under several operating conditions. This can be

useful for approximating the diode power dissipation.

The total IC power dissipation can be estimated from the previous plots by summing the gate drive losses with

the bootstrap diode losses for the intended application.

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