NJM3770A 데이터 시트보기 (PDF) - Japan Radio Corporation

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NJM3770A

STEPPER MOTOR DRIVER

Japan Radio Corporation  

NJM3770A

Heatsinking

The junction temperature of the chip highly effects the lifetime of the circuit. In high-current applications, the

heatsinking must be carefully considered.

The Rthj-a of the NJM3770A can be reduced by soldering the ground pins to a suitable copper ground plane on

the printed circuit board (see figure 8) or by applying an external heatsink type V7 or V8, see figure 10.

The diagram in figure 15 shows the maximum permissible power dissipation versus the ambient temperature in

°C, for heatsinks of the type V7, V8, or a 20 cm2 copper area respectively. Any external heatsink or printed circuit

board copper must be connected to electrical ground.

For motor currents higher than approx 600 mA, some form of heatsinking is recommended to assure optimal

reliability.

The diagrams in figures 14 and 15 can be used to determine the required heatsinking of the circuit. In some

systems, forced-air cooling may be available to reduce the temperature rise of the circuit.

33,5 mm

18,5 mm

38.0 mm

38.0 mm

Figure 10. Heatsinks, Staver, type V7 and V8

by Columbia-Staver UK

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