Samsung ML-2851ND/XAZ Service Manual page 29

Motor Driving
The main motor driving circuits is on the BLDC Motor Ass y Unit. Main Controller has the interfacing circuits. There is
motor driver IC on the motor control board of Motor Ass y Unit.
The exit motor driving circuits is formed when the driver IC is selected. The AN44060A Motor Driver IC is used in this
case. The resistance Rs value for sensing and voltage value for the V reference can be changed by motor driving volt-
age value. The motor driving voltage is calculated with the following formula.
IN 0, 2 IN 1, 3
L L
H L
L H
H H
The motor driving circuit is formed when the Driver IC is selected. The A3977 Motor Driver IC is used in this case. The
resistance Rs value for sensing and voltage value for the V reference can be changed by motor driving voltage value.
The motor driving voltage is calculated with the following formula.
I = Vref / Rs, wherein Vref is (R1 5V) / (R1+R2).
Service Manual
Product spec and feature
Output Current
Vref / (10*Rs) = Iout
Vref / (15*Rs) = Iout * 2/3
Vref / (30*Rs) = Iout * 1/3
0
2-20
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