STK672-210 查看數據表（PDF） - SANYO -> Panasonic
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STK672-210
SANYO -> Panasonic
STK672-210 Datasheet PDF : 8 Pages
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STK672-210
t1: The time until the winding current reaches its rated current (IOH)
t2: The time in the constant-current control (PWM) region
t3: The time from the point a phase signal is cut until the back EMF current is dissipated.
t1 = (–L/(R + 0.77) ln (1 – ((R + 0.77)/VCC1) × IOH)
t3 = (–L/R) ln ((VCC1 + 0.77)/(IOH × R + VCC1 + 0.77)
VCC1: Motor supply voltage (V)
L: Motor inductance (H)
R: Motor winding resistance (Ω)
IOH: Set motor output current wave height (A)
The constant-current control time t2, and the time T (= t1 + t2 + t3) that the phase signal is on in each excitation mode
are as follows.
2 phase excitation mode: t2 = (2/Clock) – (t1 + t3)
1-2 phase excitation mode: t2 = (3/Clock) – t1
Determine the values for Vsat and Vdf by substitution using the graphs for Vsat vs IOH and Vdf vs IOH for the set
current value for IOH. Then judge whether or not a heat sink is required from the determined average power dissipation
for the STK672-210 by comparison with the ∆Tc vs. Pd graph.
Note that it is necessary to check the temperature rise in the actual application system case, since the STK672-210
substrate temperature Tc changes with the air convection conditions around the STK672-210 when a heat sink without
fins is used.
Vsat — IO
3.5
3.0
2.5
2.0
1.5
Tc=105°C25°C
1.0
0.5
0
0
0.45
0.5
1.0
1.5
2.0
2.5
Output current, IO — A
Vref — IOH
ITF02291
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2
Motor current, IOH — A
ITF02293
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
1000
7
5
3
2
Vdf — If
Tc=25°C
105°C
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2
Output current, If — A
IIH — Tc
ITF02292
IIH
100
7
5
3
2
10
7
5
3
2
1.0
IIL
0
20
40
60
80
100
120
Substrate temperature, Tc — °C ITF02294
No.7464-7/8
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