NJM37770 Просмотр технического описания (PDF) - Japan Radio Corporation

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NJM37770

STEPPER MOTOR DRIVER

Japan Radio Corporation  

NJM37770

Analog control

As the current levels can be continuously controlled by modulating the VR input, limited microstepping can be

achieved.

Sensor resistor

The RS resistor should be of a noninductive type power resistor. A 0.5 ohm resistor, tolerance ≤ 1%, is a good

choice for 800 mA max motor current at VR = 5V.

The peak motor current, im , can be calculated by using the formula:

im = (VR • 0.080) / RS [A], at 100% level

External recirculation diodes

Recirculation diodes must be connected across each motor terminal and the supply voltage, VMM. The anodes shall

be connected to the motor terminals and the cathodes to the VMM voltage. Ultra-fast recovery diodes should be

used for maximum performance and reliability.

Figure 8. Copper foil used as a heatsink

Figure 9. Principal operating sequence.

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