NJM3517E2 Ver la hoja de datos (PDF) - Japan Radio Corporation

Número de pieza

componentes Descripción

Fabricante

NJM3517E2

STEPPER MOTOR CONTROLLER / DRIVER

Japan Radio Corporation  

NJM3517

RExt

i

R

VZ

Figure 12. Diode turn-off circuit

Figure 13. Resistance turn-off circuit

Figure 14. Zener diode turn-off circuit

V1

0V

CS V2

Power supply

Figure 15. Power return turn-off circuit

Figure 16. Power return turn-off circuit

for bi-level

s INPUT AND OUTPUT SIGNALS FOR DIFFERENT DRIVE MODES

The pulse diagrams, figures 7 through 10, show the necessary input signals and the resulting output signals for

each drive mode.

On the left side are the input and output signals, the next column shows the state of each signal at the cursor

position marked “C.”

STEP is shown with a 50% duty cycle, but can, of course, be with any duty cycle, as long as pulse time (tp) is

within specifications.

PA and PB are displayed with low level, showing current sinking.

L and L are displayed with high level, showing current sourcing.

A

B

s USER HINTS

1. Never disconnect ICs or PC-boards when power is supplied.

2. If second supply is not used, disconnect and leave open VSS, LA, LB, and RC. Preferably replace the VMM supply

diodes (D1, D2) with a straight connection.

3. Remember that excessive voltages might be generated by the motor, even though clamping diodes are used.

4. Choice of motor. Choose a motor that is rated for the current you need to establish desired torque. A high

supply voltage will gain better stepping performance. If the motor is not specified for the VMM voltage, a current

limiting resistor will be necessary to connect in series with center tap. This changes the L/R time constant.

5. Never use L or L for continuous output at high currents. L and L on-time can be altered by changing the RC

A

B

A

B

net. An alternative is to trigger the mono-flip-flop by taking a STEP and then externally pulling the RC pin

(12Pin) low (0V) for the desired on-time.

6. Avoid VMM and VSS power supplies with serial diodes (without filter capacitor) and/or common ground with VCC.

The common place for ground should be as close as possible to the IC’s ground pin (pin 3).

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