Datasheet

TMC5130A DATASHEET (Rev. 1.14 / 2017-MAY-15) 14
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Attention
In case VSA is supplied by a different voltage source, make sure that VSA does not exceed VS by
more than one diode drop upon power up or power down.
3.2 Reduced Number of Components
5V Voltage
regulator
+V
M
5VOUT
VSA
4.7µ
VCC
100n
Optional use lower
voltage down to 6V
Figure 3.2 Reduced number of filtering components
The standard application circuit uses RC filtering to de-couple the output of the internal linear
regulator from high frequency ripple caused by digital circuitry supplied by the VCC input. For cost
sensitive applications, the RC-Filtering on VCC can be eliminated. This leads to more noise on 5VOUT
caused by operation of the charge pump and the internal digital circuitry. There is a slight impact on
microstep vibration and chopper noise performance.
3.3 Internal RDSon Sensing
For cost critical or space limited applications, sense resistors can be omitted. For internal current
sensing, a reference current set by a tiny external resistor programs the output current. For calculation
of the reference resistor, refer chapter 11.
Full Bridge A
Full Bridge B
stepper
motor
N
S
OA1
OA2
OB1
OB2
Driver
BRB
BRA
DAC Reference
AIN_IREF
IREF
AIN_IREF
5VOUT
R
REF
Figure 3.3 RDSon based sensing eliminates high current sense resistors