STK672-732AN-E
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7
[Setting the motor current]
The motor current, I
OH
, is set using the Pin 19 voltage, Vref, of the IPM.
Equations related to I
OH
and Vref are given below.
Vref (RO2 (RO2+RO1)) V
DD
(5 V) ········································· (1)
I
OH
(Vref 4.9) Rs ······························································· (2)
The value of 4.9 in Equation (2) above represents the Vref voltage as divided by a circuit inside the control IC.
Rs : 0.141 (Current detection resistor inside the IPM)
IOH
0
[Smoke Emission Precuations]
If Pin 18 (S.G terminal) is attached to the board without using solder, overcurrent may flow into the MOSFET at V
CC
ON
(24 V ON), causing the STK672-732AN-E to emit smoke because 5 V circuits cannot be controlled.
In addition, as long as one of the output Pins, 1, 3, 5, or 7, is open, inductance energy stored in the
motor results in electrical stress on the driver, possibly resulting in the emission of smoke.
Input Pin Functions
Pin Name Pin No. Function Input Conditions When Operating
ΦA 13 Phase signal input of 5pin (phase A output).
Low active(with a function to prevent
simultaneous ON of ΦA and ΦAB ,or ΦB and
ΦBB.
ΦAB 17 Phase signal input of 7pin (phase AB output).
ΦB 12 Phase signal input of 3pin (phase B output).
ΦBB 10 Phase signal input of 1pin (phase BB output).
RESETB 14
System reset
Initial state of A and BB phase excitation in the
timing charts is set by switching from low to high.
A reset is applied by a low level
ENABLE 15
The A, AB, B, and BB outputs are turned off, and
after operation is restored by returning the ENABLE
pin to the high level, operation continues with the
same excitation timing as before the low-level input.
The A, AB, B, and BB outputs are turned off by a
low-level input.
Output Pin Functions
Pin Name Pin No. Function Input Conditions When Operating
FAULT 16
Monitor pin used when over-current detection or
overheat detection function is activated.
Low level is output when detected.
Note : See the timing chart for the concrete details on circuit operation.
