L6227Q

Circuit description

13/27

Figure 10 shows the typical operating waveforms of the output current, the voltage drop

across the sensing resistor, the RC pin voltage and the status of the bridge. Immediately

after the low-side power MOS turns on, a high peak current flows through the sensing

resistor due to the reverse recovery of the freewheeling diodes. The L6227Q provides a 1

µs

blanking time t

prematurely re-trigger the monostable.

Figure 10.

Output current regulation waveforms

Figure 11 shows the magnitude of the off time t

approximately calculated from the equations:

Dead Time with:

20 k

0.47 nF

Therefore:

OFF

BC

DD

A

BC

ON

2.5V

0

Fast Deca

y

Fast Deca

y

Slow Decay

Slow Decay

1

1

1

SYNCHRONOUS OR QUASI

SYNCHRONOUS RECTIFICATION

1

5V

D01IN1334