TMC5161 DATASHEET (Rev. 1.01 / 2018-NOV-20)
75
Internal low-side
driver enable
1
0
Internal high-side
driver enable
1
0
VS
VS-VBM
S2G level
No-short
area
Short to GND
detected
LS short
detection
(S2VS)
Output
floating
BMx
(coil output
voltage)
HS short
detection
(S2G)
S2VS level
VBM
No-short
area
0V
tSD
tSD
tSD
1
0
Driver disable
inactive
Short detected
Internal Error Flag
short
delay
detection
active
inactive
detection active
Short to VS monitor phase
Short to GND monitor phase
short
delay
short
delay
inactive
inactive
Figure 11.1 Short detection
As the low-side short detection includes the sense resistor, it can be set to a high sensitivity and
provides good precision of current detection. This way, it will safely cover most overcurrent
conditions, i.e. when the motor stalls, or is abruptly stopped in stealthChop mode.
Hint
Once a short condition is safely detected, the corresponding driver bridge (A or B) becomes switched
off, and the s2ga or s2gb flag, respectively s2vsa or s2vsb becomes set.
To restart the motor, disable and re-enable the driver.
Attention
Short protection cannot protect the system and the power stages for all possible short events, as a
short event is rather undefined and a complex network of external components may be involved.
Therefore, short circuits should basically be avoided.
Hint
Set low-side short protection (S2VS) to sensitively detect an overcurrent condition (at 150 to 200% of
nominal peak current). Especially with low resistive motors an overcurrent can easily be triggered by
false settings, or motor stall when using stealthChop. Therefore a sensitive short to VS setting will
protect the power stage.
Attention
High-side short detection (S2G) sensitivity may increase at voltages above 52V. Therefore a higher
setting (level +3 counts) is required if motor supply voltage can overshoot up to 55V
High-side short detection may falsely trigger if motor supply voltage overshoots 55V.
www.trinamic.com
TRINAMIC [ TRINAMIC MOTION CONTROL GMBH & CO. KG. ]
