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STK672-340-E Scheda tecnica(PDF) 4 Page - Sanyo Semicon Device

Il numero della parte STK672-340-E
Spiegazioni elettronici  Thick-Film Hybrid IC Unipolar Fixed-Current Chopper (External-Excited PWM) Scheme and Built-in Phase Signal Distribution IC Two-Phase Stepping Motor Driver (Square Wave Drive) Output Current 2.2A
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Produttore elettronici  SANYO [Sanyo Semicon Device]
Homepage  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

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STK672-340-E
No.A1254-4/13
Sample Application Circuit
• To minimize noise in the 5V system, locate the ground side of capacitor CO2 in the above circuit as close as possible
to pin 1 of the IC. Also, if at all possible, the ground used for Vref must not be common to the P.GND pattern, but
must be directly wired from pin 1.
• Insert resistor RO3 (47 to 100Ω) so that the discharge energy from capacitor CO4 is not directly applied to the CMOS
IC in this hybrid device. If the diode D1 has Vf characteristics with Vf less than or equal to 0.6V (when If = 0.1A),
this will be smaller than the CMOS IC input pin diode Vf. If this is the case RO3 may be replaced with a short
without problem.
• Apply 2.5V High level input to pins 8, 9, 10, 11, and 12.
• Since the input pins do not have built-in pull-up resistors, when the open-collector type pins 8, 9, 10, 11, and 12 are
used as inputs, a 10 to 47k
Ω pull-up resistor (to VDD) must be used.
• To prevent incorrect operation due to chopping noise, we recommend inserting 470 to 1000pF capacitors between pin
1 and each of the pins 8, 9, 10, and 12.
(With the open-collector type IC, we also recommend inserting a 470 to 1000pF capacitor between pin 11 (RESETB)
and pin 1 when pin 11 is used as an input.)
• The following circuit (for a lowered current of over 0.2A) is recommended if the application needs to temporarily
lower the motor current. Here, a value of close to 100k
Ω must be used for resistor RO1 to make the transistor output
saturation voltage as low as possible.
5V
RO1
RO2
RO3
Vref
5V
RO1
RO2
RO3
Vref
ITF02172
ITF02171
VDD=5V
CLOCK
MODE
CWB
5V
5V
RESETB
6
9
8
10
11
7
ENABLE
12
D1
RO3
RO4
20k
Ω
CO4
10
μF
RO1
Vref
RO2
0.1
μF
CO1
CO3
+
+
+
10
μF
5
A
4
AB
3
B
2
BB
1
GND
STK672-340-E
CO2
At least 100
μF
VCC
24V
P.GND
ITF02170
2-phase stepping motor


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