STK673-010 Просмотр технического описания (PDF) - SANYO -> Panasonic

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производитель

STK673-010

3-Phase Stepping Motor Driver (sine wave drive) Output Current 2.4A

SANYO -> Panasonic 

STK673-010

clock signals. Refer to Timing Chart for exemplary opera-

tions.

[Enable]

High input renders a normal operation and Low input forc-

ibly renders a gate signal of MOSFETs Low, thereby cut-

ting a motor current. Once again High input renders a

current to conduct in the motor. The timing of the current

does not synchronize with the clock.

Since Low input of Enable forcibly cuts the motor current,

it can be used to cut a V-phase or W-phase while Clock is

maintained in a Low level state after the RESET operation.

Figure 2. Input timings of RESET signal, Enable signal and Clock signal

[Vref (Setting motor current peak value)]

A peak value of a motor current Io is determined by R01,

R02, VCC2 (5V) and the following set equation (I).

Set equation of peak value of motor current Io

where

Io peak = Vref ÷ K......(I)

Vref ≤ 0.5 × VCC2 K = 0.63 (V/A)

Vref = VCC2 × Rox ÷(R01 + Rox)

Rox = (R02 × 4.0 kΩ) ÷ (R02 + 4.0 kΩ)

• R02 is preferably set to be 100Ω in order to minimize

the effect of the internal impedance (4.0kΩ ±30%) of

STK637-010

• K in the above-mentioned set equation varies within

±5 to ±10% depending on the inductance L and resis-

tance value R of the used motor. Check the peak

value setting of Io upon actual setting.

* Refer to Figure 4 for an example of Vref-Io character-

istics

(2) Allowable Operating Ranges of Motor Current

Set the peak value of the motor current Io so as to lie

within a region below the curve shown in Figure 5 on page

14.

When the operation substrate temperature Tc is set to

105°C, Io max should be 2.4 A or lower and a Hold opera-

tion should be conducted where Io max is 2.0 A or lower.

For operation where Tc = 50°C, Io max should be 4.0 A or

lower and a Hold operation should be conducted where Io

max is 3.3 A or lower.

(3) Heat Radiation Design

Heat radiation design for reducing the operation substrate

temperature of the hybrid IC is effective in enhancing the

quality of the hybrid IC.

The size of a heat sink varies depending on the average

power loss Pd in the hybrid IC. As shown in Figure 6 on

page 14, Pd increases in accordance with the increase of

the output current.

Since the starting current and the stationary current coexist

in an actual motor operation, Pd cannot be obtained only

from the data shown in Figure 6. Therefore, Pd is obtained

assuming that the timing of the actual motor operation is a

repeated operation shown in the following Figure 3.

No. 5708—8/16

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