PBL3772-1 데이터 시트보기 (PDF) - Ericsson
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PBL3772-1 Datasheet PDF : 8 Pages
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PBL 3772/1
a voltage rating of 1 to 6 V, while the
supply voltage usually ranges from 12
to 40 V.
Low inductance, especially in
combination with a high supply voltage,
enables high stepping rates. However,
to give the same torque capability at low
speed, a reduced number of turns in the
winding must be compensated by a
higher current. A compromise has to be
made.
Choose a motor with the lowest
possible winding resistance that still
gives the required torque, and use as
high supply voltage as possible, without
exceeding the maximum recommended
40 V. Check that the chopping duty
cycle does not exceed 50% at maximum
current.
General
Phase inputs. A logic HIGH on a Phase
input gives a current flowing from pin MA
into pin M . A logic LOW gives a current
B
flow in the opposite direction. A time
delay prevents cross conduction in the
H-bridge when changing the Phase
input.
Heat sinking. Soldering the batwing
ground leads onto a copper ground
plane of 20 cm2 (approx. 1.8" x 1.8"),
copper foil thickness 35 µm, permits the
circuit to operate with 750 mA output
current, both channels driving, at
ambient temperatures up to 70°C.
Consult figures 8, 9, 10 and 14 in order
to determine the necessary copper
ground plane area for heat sinking at
higher current levels.
Thermal shutdown. The circuit is
equipped with a thermal shutdown
function that turns the output off at chip
temperatures above 160°C. Normal
operation is resumed when the tempera-
ture has decreased about 20°C.
Operating temperature. The max
recommended 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
about 5 years.
PD (W)
3.0
2.5
PBL 3772
Two channels on.
R = 0.68 ohm.
2.0
1.5
1.0
.5
00
Two channels on.
RB = 0.47 ohm.
One channel on.
RB = 0.47 ohm.
V MM = 12 V
.20 .40 .60 .80 1.0 1.2
I M (A)
Figure 8. Power dissipation vs. motor
current.Ta = 25°C.
Maximum allowable power dissipation [W]
6
5
4
3
Ambient temperature
2
1
0
-25 0
25 50 75 100 125 150
Temperature [°C]
PLCC package
DIP package
All ground pins soldered onto a
20 cm2 PCB copper area with
free air convection.
Figure 10. Maximum allowable power
dissipation vs. temperature.
Vd (V)
PBL 3772
1.2
1.0
.8
.6
.4
.2 0
.20 .40 .60 .80 1.0 1.2
I M (A)
Figure 12. Typical lower diode voltage
drop vs. recirculating current.
PD (W)
3.0
PBL 3772
2.5
VMM = 36 V
2.0
1.5
V MM = 12 V
1.0
.5
RB = 0.68 Ω
00
.20 .40 .60 .80 1.0 1.2
I M (A)
Figure 9. Power dissipation vs. motor
current, both channels on.Ta = 25°C.
VCE Sat, lt (V)
1.2
PBL 3772
1.0
.8
.6
TJ =125°C
TJ =25°C
.4
.2
0 .20 .40 .60 .80 1.0 1.2
I M (A)
Figure 11. Typical lower transistor
saturation voltage vs. output current.
VCE Sat, ut (V)
1.2
1.0
.8
.6
.4
.2
PBL 3772
R B = 0.47 Ω
R B = 0.68 Ω
0 .20 .40 .60 .80 1.0 1.2
I M (A)
Figure 13. Typical upper transistor
saturation voltage vs. output current.
7
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