LB1847

No.5982-8/15

MIX DECAY

tm

tn

toff

ton

E pin

Output pin

RC pin

Output pin

Switching waveform

Noise spike

ton : Output ON time

toff : Output OFF time

tm : FAST DECAY time in MIX DECAY mode

tn

: Noise cancelling time

MIX DECAY logic setting

DECAY pin : L

MD pin : 1.5V to 4.0V voltage setting

CR voltage and MD pin voltage are compared to select dual-side chopping or upper-side chopping.

CR voltage > MD pin voltage: dual-side chopping

CR voltage < MD pin voltage: upper-side chopping