NJM3771
General
Phase inputs
A logic HIGH on a Phase input gives positive current flowing out from M
A
into M
B
. A logic LOW gives a current in
the opposite direction.
Slow/fast current decay
A logic HIGH on the CD input gives slow current decay, a logic LOW gives fast current decay.
Heat sinking
Soldering the four center pins onto a free PCB copper area of 20 cm
2
(approx. 1.8" x 1.8", copper foil thickness =
35
µm)
permits the circuit to operate with a maximum of 320 mA output current, both channels driving, at ambient
temperatures up to +70°C. Consult figures 9 and 14 in order to determine the necessary copper area for heat
sinking if higher currents are required.
Thermal shutdown
The circuit is equipped with a thermal shutdown function that reduces the output current at chip temperatures
above +160°C.
Thermal resistance [°C/W]
80
70
60
22-pin
DIP
24-pin EMP
50
40
30
20
5
10
15
20
25
30
35
28-pin
PLCC
PCB copper foil area [cm
2
]
PLCC package
DIP package
Figure 9. Thermal Resistance vs. PC Board copper area and suggested layout
NJRC [ NEW JAPAN RADIO ]
