Datenblatt-pdf.com


STK672-600 Schematic ( PDF Datasheet ) - ON Semiconductor

Teilenummer STK672-600
Beschreibung 2-phase Stepping Motor Driver
Hersteller ON Semiconductor
Logo ON Semiconductor Logo 




Gesamt 19 Seiten
STK672-600 Datasheet, Funktion
Ordering number : ENA0755A
STK672-600
Thick-Film Hybrid IC
2-phase Stepping Motor Driver
http://onsemi.com
Overview
The STK672-600 is a hybrid IC for use as a unipolar, 2-phase stepping motor driver with PWM current control.
Applications
Office photocopiers, printers, etc.
Features
The motor speed can be controlled by the frequency of an external clock signal.
2-phase excitation or 1-2 phase excitation is selected according to switching the state of the MODE1 pin (low or high).
The excitation mode is set at the rising edge of the clock signal when the MODE2 pin is high, or at the rising edge or
falling edge when the MODE2 pin is low.
The phase is maintained even if the excitation mode is switched in the middle of operation.
The direction of rotation can be changed by applying a high or low signal to the CWB pin used to select the direction
of rotation.
Supports schmitt input for 2.5V high level input.
Incorporating a current detection resistor (0.141Ω: resistor tolerance ±2%), motor current can be set using two
external resistors.
Equipped with an ENABLE pin that, during clock input, allows motor output to be cut-off and resumed later while
maintaining the same excitation timing.
Semiconductor Components Industries, LLC, 2013
June, 2013
62911HKPC 018-08-0102/71608HKIM No. A0755-1/19






STK672-600 Datasheet, Funktion
STK672-600
5V
R01
Vref
R3 R02
5V
R01
Vref
R3
R02
Motor current peak value IOH setting
IOH
0
When R02 is open
IOH= [Vref×1k/1k+3.9k)] ÷Rs= (Vref÷4.9) ÷Rs
The values 1k and 3.9k represent internal driver resistance values, while Rs represents the internal driver current
detection resistance.
Vref= (4.9k÷ (4.9k+R01)) ×5V (or 3.3V) =IOH×4.9×Rs
The value 4.9k represents the series resistance value of the internal driver values of 1k and 3.9k.
If R02 is connected
IOH= [Vref×1k/ (1k+3.9k)] ÷Rs= (Vref÷4.9) ÷Rs
The values 1k and 3.9k represent the internal driver resistance values, while Rs represents the internal driver current
detection resistance.
Vref= (R0x÷ (R01+R0x)) ×5V (or 3.3V) =IOH×4.9×Rs
= [(4.9k×R02) ÷ ((4.9k×R02) +R01× (4.9k+R02))] ×5V(or 3.3V)
R0x= (4.9k×R02) ÷ (4.9k+R02)
Rs represents the current detection resistance inside the HIC, while the value 4.9k in the formula above represents the
internal resistance value of the Vref pin.
Rs=0.141Ω when using the STK672-600
Rs=0.089Ω when using the STK672-610
Input Pin Functions
Pin Name
Pin No.
Function
Input Conditions When Operating
CLOCK
12 Reference clock for motor phase current switching
Operates on the rising edge of the signal (MODE2=H)
MODE1
10 Excitation mode selection
Low: 2-phase excitation
High: 1-2 phase excitation
MODE2
17
High: Rising edge
Low: Rising and falling edge
CWB
13 Motor direction switching
Low: CW (forward)
High: CCW (reverse)
RESETB
14 System reset and A, AB, B, and BB outputs cutoff.
A reset is applied by a low level
Applications must apply a reset signal for at least 10μs when
ENABLE
VDD is first applied.
15 The A, AB, B, and BB outputs are turned off, and after
The A, AB, B, and BB outputs are turned off by a low-
operation is restored by returning the ENABLE pin to the high level input.
level, operation continues with the same excitation timing as
before the low-level input.
(1) A simple reset function is formed from D1, CO4, RO3, and RO4 in this application circuit. With the CLOCK input
held low, when the 5V supply voltage is brought up a reset is applied if the motor output phases A and BB are
driven. If the 5V supply voltage rise time is slow (over 50ms), the motor output phases A and BB may not be driven.
Increase the value of the capacitor CO2 and check circuit operation again.
(2) See the timing chart for the concrete details on circuit operation.
No. A0755-6/19

6 Page









STK672-600 pdf, datenblatt
STK672-600
2. Calculating STK672-600 HIC Internal Power Loss
The average internal power loss in each excitation mode of the STK672-600 can be calculated from the following
formulas.
Each excitation mode
2-phase excitation mode
2PdAVex= (Vsat+Vdf) ×0.5×CLOCK×IOH×t2+0.5×CLOCK×IOH× (Vsat×t1+Vdf×t3)
1-2 Phase excitation mode
1-2PdAVex= (Vsat+Vdf) ×0.25×CLOCK×IOH×t2+0.25×CLOCK×IOH× (Vsat×t1+Vdf×t3)
Motor hold mode
HoldPdAVex= (Vsat+Vdf) ×IOH
Vsat: Combined voltage represented by the Ron voltage drop+shunt resistor
Vdf: Combined voltage represented by the MOSFET body diode+shunt resistor
CLOCK: Input CLOCK (CLOCK pin signal frequency)
t1, t2, and t3 represent the waveforms shown in the figure below.
t1: Time required for the winding current to reach the set current (IOH)
t2: Time in the constant current control (PWM) region
t3: Time from end of phase input signal until inverse current regeneration is complete
IOH
0A
t1 t2
t3
Motor COM Current Waveform Model
t1= (-L/(R+0.42)) In (1-((R+0.42)/VCC) ×IOH)
t3= (-L/R) In ((VCC+0.42)/(IOH×R+VCC+0.42))
VCC: Motor supply voltage (V)
L: Motor inductance (H)
R: Motor winding resistance (Ω)
IOH: Motor set output current crest value (A)
Relationship of CLOCK, t1, t2, and t3 in each excitation mode
2-phase excitation mode: t2= (2/CLOCK) - (t1+t3)
1-2 phase excitation mode: t2= (3/CLOCK) -t1
For Vsat and Vdf, be sure to substitute values from the graphs of Vsat vs. IOH and Vdf vs. IOH while the set current
value is IOH.
Then, determine whether a heat sink is required by comparing with the graph of ΔTc vs. Pd based on the average HIC
power loss calculated.
When designing a heat sink, refer to the section “Thermal design” found on the next page. The average HIC power
loss, PdAV, described above does not have the avalanche’s loss. To include the avalanche’s loss, be sure to add
Equation (2), “STK676-6** Allowable Avalanche Energy Value” to PdAV above. When using this IC without a fin
always check for temperature increases in the set, because the HIC substrate temperature, Tc, varies due to effects of
convection around the HIC.
No. A0755-12/19

12 Page





SeitenGesamt 19 Seiten
PDF Download[ STK672-600 Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
STK672-6002-phase Stepping Motor DriverON Semiconductor
ON Semiconductor

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche