NJM37770 New Japan Radio Co., Ltd., NJM37770 Datasheet - Page 9

• Manufacturer Part Number: NJM37770
• Description: STEPPER MOTOR DRIVER
• Manufacturer: New Japan Radio Co., Ltd.

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 printed circuit board (see figure 8) or by applying an external heatsink type V7 or V8, see figure 10.
°C, for heatsinks of the type V7, V8, or a 20 cm
board copper must be connected to electrical ground.
reliability.
systems, forced-air cooling may be available to reduce the temperature rise of the circuit.
The Rth
The diagram in figure 15 shows the maximum permissible power dissipation versus the ambient temperature in
For motor currents higher than approx 600 mA, some form of heatsinking is recommended to assure optimal
The diagrams in figures 14 and 15 can be used to determine the required heatsinking of the circuit. In some
j-a
of the NJM37770 can be reduced by soldering the ground pins to a suitable copper ground plane on
Figure 10. Heatsinks, Staver, type V7 and V8
by Columbia-Staver UK
2
copper area respectively. Any external heatsink or printed circuit
NJM37770