4 Component Description
Figure 4-1. Render With Components Labelled
Table 4-1. Component Reference
Connector/Component
Function
J1
Main poer supply connector
J3
Motor connection
J4
Signal header test points
J6
Header for launchpad connection
VREF
Potentiometer for VREF Adjustment
3.3 V
3.3-V LDO Test point
IN1 PWM
Potentiometer for VREF Adjustment
GND
Main ground
Explanation of Components:
1. Pot1 controls the PWM signal that goes into IN1, by turning it clockwise you increase the duty cycle from 0%
to 100%.
2. Pot 2 controls the PWM signal that goes into IN2, by turning it clockwise you increase the duty cycle from
0% to 100%.
3. The potentiometer labelled VREF controls the setting for VREF. When turning it clockwise it increases
gradually until it reaches its limit adjusting VREF for 3.3 V
a. VREF is responsible for current regulation threshold, by lowering the value in VREF turning it
counterclockwise you will lower the current regulation threshold.
4. IN1 and IN2 test points will display the PWM signals coming from the microcontroller. Be sure to refer to the
stickers in the board to correctly identify IN1 and IN2 test points.
5. Vsense/Ipropi test point provides a voltage that is dependent on the current going through the load for
current regulation.
a. Said curent, and current regulation can be calculated by the equations in the current sensing and current
regulation section.
Component Description
SLVUC78 – NOVEMBER 2021
DRV8251/AEVM User's Guide
5
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