tb62202afg TOSHIBA Semiconductor CORPORATION, tb62202afg Datasheet - Page 25

• Manufacturer Part Number: tb62202afg
• Description: Dual-stepping Motor Driver Ic For Oa Equipment Using Pwm Chopper Type
• Manufacturer: TOSHIBA Semiconductor CORPORATION

MIXED DECAY Mode Waveforms
NF is the point where the output current reaches the set current value. RNF is the timing for monitoring the set
current.
In Mixed Decay and Fast Decay modes, where the condition RNF (set current monitor signal) < (output current)
applies, Charge mode is cancelled at the next chopping cycle (charge cancel circuit). Therefore, at the next chopping
cycle, the IC enters Slow + Fast modes (Slow D Fast at MDT).
DECAY MODE 0
DECAY MODE 1
DECAY MODE 2
DECAY MODE 3
CR pin
input
waveform
SLOW
DECAY
MODE
37.5%
MIXED
DECAY
MODE
75%
MIXED
DECAY
MODE
FAST
DECAY
MODE
100%
Charge
Charge
Charge
NF
NF
NF
87.5%
Charge
MDT
75%
NF
62.5%
(concept of mixed decay mode)
Fast
Fast
Slow
25
Slow
f
50%
chop
Set current value
37.5%
MDT
25%
Fast
Set current value
Set current value
Set current value
12.5%
TB62202AFG
2005-04-04
0
Monitoring
set current
value
Monitoring
set current
value
Monitoring
set current
value
RNF
RNF
RNF