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PDF PBL37761 Data sheet ( Hoja de datos )

Número de pieza PBL37761
Descripción Dual Controller IC for High Current Stepper Motor Applications
Fabricantes Ericsson 
Logotipo Ericsson Logotipo



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February 1999
PBL 3776/1
Dual Controller IC for High Current
Stepper Motor Applications
Description
The PBL 3776/1 is a switch-mode (chopper), constant-current controller IC intended
for controlling external transistors in a high current stepper motor application.The IC
has two channels one for each winding of a two-phase stepper motor. The circuit is
similar to Ericsson´s PBL 3775/1. PBL 3776/1 is equipped with a Disable input to
simplify half-stepping operation.
The PBL 3776/1 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 sections each containing four outputs, two source and two sink, intended
to drive an external H-bridge.
Voltage supply requirements are +5 V for logic and +10 to +45 V for the outputs.
The close match between the two driver channels guarantees consistent output
current ratios and motor positioning accuracy.
Key Features
• Suitable to drive any external Mos Fet
or bipolar power transistor.
• 0°C to +85°C operation.
• Few external components.
• Crossconduction prevented by time
delay.
• Close matching between channels for
high positioning accuracy.
• Digital filter on chip eliminates
external
filtering components.
• Plastic 24-pin "narrow" DIP package.
Phase 1
Dis 1 VR1
C1 SGND 1
Pwr GND 1
1
PBL 3776/1
VCC
V
CC
+ RQ
S
Logic
+
RC
Logic
+ SQ
R
Phase 2
Dis2 VR2
C2
SGND 2
Figure 1. Block diagram.
Pwr GND 2
T1BL
T1AL
T1AU
T1BU
VBB1
VBB2
T2BU
T2AU
T2AL
T2BL
24-pin plastic DIP package, narrow
1

1 page




PBL37761 pdf
PBL 3776/1
Functional Description
Each channel of the PBL 3776/1
consists of the following sections:
• An output section with four output
transistors, two sourcing and two
sinking, intended to drive the four
transistors in an external H-bridge.
Each transistor is capable of driving
up to 200 mA continuous current.
• A logic section that controls the
output transistors.
• An S-R flip-flop, and a comparator.
The clock-oscillator is common to
both channels.
Constant current control is achieved
by switching the output current to the
windings. This is done by sensing the
peak current through the winding via a
current-sensing resistor RS, effectively
connected in series with the motor
winding. As the current increases, a
voltage develops across the sensing
resistor, which is fed back to the
comparator. At the predetermined level,
defined by the voltage at the reference
input VR, the comparator resets the flip-
flop, which turns off the sourcing output
transistor in the circuit. Consequently the
correspond-ing lower external transistor,
in the H-bridge, is turned off. The turn-off
of one channel is independent of the
other channel. The current decreases
until the clock oscillator triggers the flip-
flops of both channels simultaneously,
which turns on the output transistors
again, and the cycle is repeated.
To prevent erroneous switching due to
switching transients at turn-on, the PBL
3776/1 includes a digital filter. The clock
oscillator provides a blanking pulse
which is used for digital filtering of the
voltage transient across the current
sensing resistor during turn-on. Due to
the high output drive capability, this
transient might exceed the max. allowed
voltage on the C inputs and damage the
circuit. A resistor is placed in the
feedback loop in order to prevent this
transient from damaging the circuit.
The current paths during turn-on, turn-
off and phase shift are shown in figure 6.
Applications Information
Output current
The maximum peak output, sink/source,
current is 500 mA. But due to the power
handling capacity of the package this
current can only be used for a short
period of time (1mS). Recommended
max continuous output current is 200
mA/output transistor. This is practical
when driving MOS FET power
transistors, since a high peak output
current capability will rapidly charge/
discharge the gate capacitance, while
the continuous current usage is very
small.
Current control
The regulated output current level to the
motor winding is determined by the
voltage at the reference input and the
value of the sensing resistor, RS. The
peak current through the sensing
resistor (and the motor winding) can be
expressed as:
IM,peak = 0.1·VR / RS [A]
With a recommended value of 0.1 ohm
for the sense resistor RS, a 5 V referen-
ce voltage will produce an output current
of approximately 5 A. RS should be
selected for maximum motor current.
Chopping frequency, winding inductance
and supply voltage also affect the
current, but to much less extent.
+5 V
Phase 1 Dis1 VR1
10 11 8
PBL
3776/1
VCC 13
V CC
C1 SGND 1
97
+ RQ
S
Rt
12 k
RC 12
Ct
4700 pF
+
SQ
+R
15 14
17
Phase 2 Dis 2 VR2
16
C2
18
SGND 2
Pwr GND 1
1
2 T1BL
4 T1AL
5 T1AU
3 T1BU
6 VBB1
19 V BB2
22 T2BU
20 T2AU
21 T2AL
23 T2BL
24
Pwr GND2
PHASE CH 2
DISABLE CH 2
REFERENCE VOLTAGE CH 2
1000pF
Vmm
R1
270
R2
390
Q1
IRF9Z34
R3
270
R4
390
Q2
IRF9Z34
R5
390
R6
270
R8
1k
Q3
IRFZ34
R7
390
R8
270
Q4
IRFZ34
+
Rs
0.11
Figure 5. Typical 5 A stepper motor driver application with PBL 3776/1. One channel shown.
5

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