pbl3775so ETC-unknow, pbl3775so Datasheet - Page 8

• Manufacturer Part Number: pbl3775so
• Description: Dual Stepper Motor Driver
• Manufacturer: ETC-unknow

PBL 3775/1
Specifications subject to change without notice.
1522-PBL 3775/1 Uen Rev. F
© Ericsson Components AB 1999
Figure 14. Typical thermal resistance vs. PC Board copper area and suggested layout.
Information given in this data sheet is believed to be
accurate and reliable. However no responsibility is
assumed for the consequences of its use nor for any
infringement of patents or other rights of third parties
which may result from its use. No license is granted by
implication or otherwise under any patent or patent rights
of Ericsson Components. These products are sold only
according to Ericsson Components' general conditions of
sale, unless otherwise confirmed in writing.
Ericsson Components AB
SE-164 81 Kista-Stockholm, Sweden
Telephone: [phone]
8
Figure 15. Stepping modes.
80
70
60
50
40
30
20
Phase
Phase
Thermal resistance [ C/W]
Dis
Dis
–100%
–140%
–100%
–140%
V
140%
100%
V
140%
100%
I
140%
100%
I
140%
100%
MA1
MA2
PLCC package
DIP package
R1
R2
1
2
1
2
5
PCB copper foil area [cm ]
10
Full step mode
15
20
25
2
30
35
Half step mode
Modified half step mode
28-pin
PLCC
16-pin
20-pin
DIP
SO
Ordering Information
Package
DIP Tube
PLCC Tube
PLCC Tape & Reel
SO Tube
SO Tape & Reel
Half-step mode. In the half-step mode,
the current in one winding is brought to
zero before a complete current reversal
is made. The motor will then have taken
two half steps equalling one full step in
rotary movement. The cycle is repeated,
but on the other phase. A total of eight
states are sequenced until the initial
state is reached again.
potential resonance problems. Resonan-
ces appear as a sudden loss of torque at
one or more distinct stepping rates and
must be avoided so as not to loose
control of the motor´s shaft position.
mode is the reduced torque in the half
step positions, in which current flows
through one winding only. The torque in
this position is approximately 70 % of the
full step position torque.
Modified half-step mode.The torque
variations in half step mode will be elimi-
nated if the current is increased about
1.4 times in the halfstep position. A
constant torque will further reduce
resonances and mechanical noise,
resulting in better performance, life
expectancy and reliability of the mecha-
nical system.
done by bringing the reference voltage
up (or down) from its nominal value
correspondingly. This can be done by
using DACs or simple resistor divider
networks. The PBL 3775/1 is designed
to handle about 1.4 times higher current
in one channel on mode, for example 2
x 500 mA in the full-step position, and 1
x 700 mA in the half-step position.
Half-step mode can overcome
One disadvantage with the half-step
Modifying the current levels must be
PBL 3775/1QNS
PBL 3775/1QNT
PBL 3775/1SOS
PBL 3775/1SOT
PBL 3775/1NS
Part No.