PBL 3771/1
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 12 and 13 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.
Operating temperature.
The max re-
commended operating temperature is
125°C. This gives an estimated lifelength
of about 5 years at continous drive, A
change of
±10°
would increase/decrease
the lifelength of the circuit with about 5
years.
V
d
(V)
T
j
= 25°C
1.0
.8
1.2
1.0
.8
V
CE Sat
(V)
T
j
= 125°C
T
j
= 25°C
.6
.4
.2
.6
T
j
= 125°C
.4
.2
0
0
.10
.20
.30
.40
.50
.60
0
.10
.20
.30
.40
.50
.60
I
M
(A)
I
M
(A)
Figure 8. Typical upper diode voltage
drop vs. recirculating current.
Figure 9. Typical source saturation
voltage vs. output current.
V
d
(V)
T
j
= 25°C
1.0
.8
V
CE Sat
(V)
1.0
.8
T
j
= 25°C
T
j
= 125°C
.6
.6
T
j
= 125°C
.4
.2
.4
.2
00
.10
.20
.30
.40
.50
.60
0
.10
.20
.30
.40
.50
.60
I
M
(A)
I
M
(A)
Figure 10. Typical lower diode voltage
drop vs. recirculating current.
P
D
(W)
Figure 11 Typical sink saturation voltage
vs. output current.
3.0
V
MM
= 36V
2.0
V
MM
= 14V
1.0
00
.10
.20
.30
.40
.50
.60
Max allow power dis
I
M
(A)
Figure 12. Power dissipation vs. motor current, both channels driven, T
a
= 25°C.
7
ERICSSON [ ERICSSON ]
