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PBL3776-1 Datasheet

  • PBL3776-1

  • Dual Controller IC for High Current Stepper Motor Applicatio...

  • 8頁

  • ERICSSON

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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麓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
鈥?Suitable to drive any external Mos Fet
or bipolar power transistor.
鈥?0擄C to +85擄C operation.
鈥?Few external components.
鈥?Crossconduction prevented by time
delay.
鈥?Close matching between channels for
high positioning accuracy.
鈥?Digital filter on chip eliminates
external
filtering components.
鈥?Plastic 24-pin "narrow" DIP package.
Phase 1
Dis 1 V
R1
C1
SGND 1
Pwr GND 1
1
PBL 3776/1
鈥?/div>
T
1BL
R
S
Q
T
1AL
T
1BU
T
1AU
Logic
V
CC
V
CC
+
+
鈥?/div>
V
BB2
T
2BU
Logic
RC
+
鈥?/div>
T
2AU
T
2AL
T
2BL
S
R
Q
24-pin plastic DIP package, narrow
Phase 2
Dis 2 V
R2
C2
SGND 2
Pwr GND 2
Figure 1. Block diagram.
1
P
B
V
BB1
L
37
76
/1

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