TB62209FG_14 Datasheet, PDF (22/52 Pages) Toshiba Semiconductor – Stepping Motor Driver IC Using PWM Chopper Type

13. MIXED DECAY MODE waveform (Current Waveform)
TB62209FG
Internal
CR CLK
signal
f_chop
f_chop
I_OUT
Set current
value
NF
Set current value
NF
25%
MIXED
DECAY
MODE
RNF
MDT (MIXED DECAY TIMING) point
• When NF is after MIXED DECAY TIMING
I_OUT
Set current
value
25%
MIXED
DECAY
MODE
f_chop
Fast Decay mode after Charge mode
f_chop
Set current value
NF
MDT (MIXED DECAY TIMING) point
NF
NF
CLK signal input
RNF
• In MIXED DECAY MODE, when the output current > the set current value
Set current
value
NF
I_OUT
f_chop
25%
MIXED
DECAY
MODE
f_chop
f_chop
Because of the set current value > the
output current, no CHARGE MODE in the
next cycle.
RNF
Set current value
NF
RNF
MDT (MIXED DECAY TIMING) point
CLK signal input
22
2014-10-01