Datasheet

TMC5130A DATASHEET (Rev. 1.11 / 2015-OCT-08) 14

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3.2 Reduced Number of Components

5V Voltage

regulator

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, it may be desired to eliminate the sense resistors.

Further, this slightly reduces power dissipation, because the effective resistance of the driver bridge is

reduced. In this application, 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

OA1

OA2

OB1

OB2

Driver

BRB

BRA

DAC Reference

AIN_IREF

IREF

AIN_IREF

5VOUT

REF

Figure 3.3 RDSon based sensing eliminates high current sense resistors