stk672-050-e ON Semiconductor, stk672-050-e Datasheet - Page 7

• Manufacturer Part Number: stk672-050-e
• Description: Thick-film Hybrid Ic Unipolar Constant-current Chopper External Excitation Pwm Circuit With Built-in Microstepping Controller Stepping Motor Driver Sine Wave Drive Output Current 3.0a No Heat Sink*
• Manufacturer: ON Semiconductor

Printed Circuit Board Design Recommendations
This hybrid IC has two grounds, the PG pins (pins 3 and 4) and the SG pin (pin 22). These are connected internally in
the hybrid IC.
Two power supplies are required: a motor drive supply and a 5V supply for the hybrid IC itself. If the ground
connections for these supplies are not good, the motor current waveforms may become unstable, motor noise may
increase, and vibration levels may increase. Use appropriate wiring for these grounds. Here we present two methods for
implementing these ground connections.
If the grounds for the motor drive supply and the hybrid IC 5V supply are connected in the immediate vicinity of the
power supplies:
• If PG and SG are shorted at the power supply, connect only the PG line to pins 3 and 4 on the hybrid IC. Also, be sure
• The current waveforms will be more stable if the Vref ground is connected to pin 22.
• For initial values, use 470μF or over for C1 and 10μF or over for C2.
If the grounds for the motor drive supply and the hybrid IC 5V supply are separated:
• Insert a capacitor (C1) of 100μF or over as close as possible to the hybrid IC. The capacitor ground line must be as
that no problems occur due to voltage drops due to common impedances. In the specifications, this must be V CC 2
±5%.
short as possible.
The capacitor C2 may be included if necessary. Its ground line should also be as short as possible.
Locate C1 as close to the hybrid IC as possible, and the capacitor ground line must be as short as possible.
Separation
supply
supply
power
power
supply
supply
Motor
power
power
Motor
drive
drive
5V
5V
PG
SG
PG
SG
+
--
+
--
+
--
+
--
470μF or over
470μF or over
C1
C1
Oscillator
Oscillator
circuit
(CLK)
circuit
(CLK)
STK672-050-E
+
+
Stepping motor
Stepping motor
+
+
3
4
7
8
3
4
7
8
STK672-050-E
STK672-050-E
PG
V CC 2
Vref
PG
V CC 2
Vref
22
22
SG
SG
14
14
CLK
CLK
ITF02396
ITF02397
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