NJM3770A 데이터 시트보기 (PDF) - Japan Radio Corporation

부품명

상세내역

제조사

NJM3770A

STEPPER MOTOR DRIVER

Japan Radio Corporation  

NJM3770A

Analog control

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

R

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.

Thermal resistance [°C/W]

90

80

70

60

50

40

30

5

10 15 20 25 30 35

PCB copper foil area [cm2]

PLCC package

DIP package

16-pin

DIP

20-pin

EMP

28-pin

PLCC

Figure 8. Copper foil used as a heatsink

I 0A

I 1A

Ph A

Ph

B

I

0B

I

1B

I

MA

100%

60%

–20%

–60%

–100%

I

MB

100%

60%

20%

–60%

–100%

Full step position

Half step position

Stand by mode

at 20 %

Half step mode at 100 %

Figure 9. Principal operating sequence.

Full step mode at 60 %

Share Link: