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Ericsson

PBL3774-1 Datasheet Preview

PBL3774-1 Datasheet

Dual Stepper Motor Driver

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February 1999
PBL 3774/1
Dual Stepper Motor Driver
Description
The PBL 3774/1 is a switch-mode (chopper), constant-current driver IC with two chan-
nels, one for each winding of a two-phase stepper motor. The circuit is similar to
Ericsson´s PBL 3771/1 and PBL 3772/1. While all Dual stepper motor drivers are
optimized for microstepping applications, the PBL 3774/1 is equipped with a TTL level
compatible Disable input to simplify half-stepping operation.
The circuit is well suited for microstepping applications together with the matching
dual DAC (Digital-to-Analog Converter) PBM 3960/1. A complete driver system
consists of these two ICs, a few passive components and a microprocessor for
generation of the proper control and data codes required for microstepping.
In full/halfstepping applications, Ericsson Component’s PBD 3517/1 can be used as
a phase generator (translator) to derive the necessary signals for the PBL 3774/1.
The PBL 3774/1 contains a clock oscillator, which is common for both driver
channels, a set of comparators and flip-flops implementing the switching control, and
two output H-bridges.
Voltage supply requirements are +5 V for logic and +10 to +45 V for the motor.
The close match between the two driver channels guarantees consistent output
current ratios and motor positioning accuracy.
Key Features
• Dual chopper driver in a single
package.
• Operation at -40 °C.
• 1000 mA continuous output current
per channel.
• Low power dissipation, 2.6 W at
2 x 750 mA output current.
• Close matching between channels for
high microstepping accuracy.
• Specially matched to the Dual DAC
PBM 3960.
• Plastic 22-pin batwing DIP package
or 28-pin power PLCC package with
lead-frame for heatsinking through
PC board copper.
Phase 1
PBL 3774/1
Dis1 VR1
C1
VCC
V
CC
+
E1
RQ
S
Logic
+
RC
Logic
+ SQ
R
Phase 2
Dis 2 VR2
C2
GND
Figure 1. Block diagram.
E2
M A1
M B1
VMM1
VMM2
M B2
M A2
28-pin PLCC package
22-pin plastic DIL package
1




Ericsson

PBL3774-1 Datasheet Preview

PBL3774-1 Datasheet

Dual Stepper Motor Driver

No Preview Available !

PBL 3774/1
Maximum Ratings
Parameter
Pin no. [DIL-package]
Voltage
Logic supply
Motor supply
Logic inputs
Comparator inputs
Reference inputs
22
9, 14
4, 7, 16, 19
2, 21
3, 20
Current
Motor output current
Logic inputs
Analog inputs
8, 11, 12, 15
4, 7, 16, 19
2, 3, 20, 21
Temperature
Operating Junction temperature
Storage temperature
Power Dissipation (Package Data)
Power dissipation at TBW = +25°C, DIP and PLCC package
Power dissipation at TBW = +125°C, DIP package
Power dissipation at TBW = +125°C, PLCC package
Recommended Operating Conditions
Parameter
Logic supply voltage
Motor supply voltage
Motor output current
Operating Junction temperature
Rise and fall time, logic inputs
Oscillator timing resistor
Symbol
Min
Max
Unit
VCC 0
7
VMM
0
45
VI -0.3 6
VC
-0.3
VCC
VR -0.3 7.5
V
V
V
V
V
IM
-1200
+1200
mA
II -10
mA
IA -10
mA
TJ
-40
+150
°C
T
S
-55
+150
°C
PD 5 W
PD 2.2 W
PD 2.6 W
Symbol
VCC
VMM
I
M
TJ
tr, tf
RT
Min
4.75
10
-1000
- 20
2
Typ
5
15
Max
5.25
40
+1000
+125
2
20
Unit
V
V
mA
°C
µs
k
Phase 1
Dis1 VR1
PBL 3774/1
19 16 20
ICC VCC 22
V
CC
C1
21
+
E1
13
RQ
S
Logic
15 kW
RT
I RC RC 1
VCC
3 300 pF
CT
VI
V
VIH VA
V
IL R
I I I IH I IL
IR IA
+
Logic
+ SQ
R
47 3
Phase 2
Dis 2 VR2
VCH
V
C
2 5, 6, 17, 18
C2 GND
IC
IA
1 kW
820 pF
CC
RC
10
E2
VE
RS
15 M A1
12 M B1
14 VMM1
9 VMM2
11 M B2
8 M A2
I MM
I M I OL
VM
V
MA
VMM
| V MA – VMB |
50 %
t on
t off
V
CH
VE
td
t
fs=
1
ton + toff
D=
ton
ton + toff
t
Figure 2. Definition of symbols.
2
Figure 3. Definition of terms.


Part Number PBL3774-1
Description Dual Stepper Motor Driver
Maker Ericsson
Total Page 8 Pages
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