PBL3776-1 Ericsson, PBL3776-1 Datasheet

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PBL3776-1

Manufacturer Part Number
PBL3776-1
Description
Dual Controller IC for High Current Stepper Motor Applications
Manufacturer
Ericsson
Datasheet
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.
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.
current ratios and motor positioning accuracy.
Figure 1. Block diagram.
V
RC
CC
The PBL 3776/1 contains a clock oscillator, which is common for both driver
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
PBL 3776/1
V
CC
+
Phase 2
Phase 1
Dis 2
Dis 1
Dual Controller IC for High Current
V
V
R2
R1
C 2
C 1
+
+
SGND 1
SGND 2
S
R
R
S
Stepper Motor Applications
Q
Q
Logic
Logic
Pwr GND 1
Pwr GND 2
1
T
T
T
T
V
V
T
T
T
T
1BL
1AL
1AU
1BU
2BU
2AU
BB1
BB2
2AL
2BL
Key Features
• Suitable to drive any external Mos Fet
• 0 C to +85 C operation.
• Few external components.
• Crossconduction prevented by time
• Close matching between channels for
• Digital filter on chip eliminates
• Plastic 24-pin "narrow" DIP package.
24-pin plastic DIP package, narrow
or bipolar power transistor.
delay.
high positioning accuracy.
external
filtering components.
PBL 3776/1
February 1999
1

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PBL3776-1 Summary of contents

Page 1

... 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 ...

Page 2

PBL 3776/1 Maximum Ratings Parameter Voltage Logic supply Output supply Logic inputs Analog inputs Current Output current t=1mS Logic inputs Analog inputs Temperature Junction temperature Storage temperature Recommended Operating Conditions Parameter Logic supply voltage Supply voltage Output emitter voltage Output ...

Page 3

Electrical Characteristics Electrical characteristics over recommended operating conditions, unless otherwise noted Parameter Symbol fig. General Supply current I CC Supply current I CC Total power dissipation P D Thermal shutdown junction temperature Turn-off delay t d Logic Inputs ...

Page 4

... Vcc Logic voltage supply, nominally + Dis Disable input for channel 2. When HIGH, all four output transistors are turned off, which results rapidly decreasing output current to zero. 15 Phase Controls the direction of channel 2 outputs T2AL, T2AU, T2BL and T2BU. ...

Page 5

... 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. ...

Page 6

... H-bridge when changing the Phase input. See truth table fig. 7. Dis (Disable) inputs A logic HIGH on the Dis inputs will turn off all four transistors of the outputs, which results in a rapidly decreasing output current to zero. See truth table fig 7. V (Reference) inputs ...

Page 7

Decouple the supply voltages close to the PBL 3776/1 circuit. Use a ceramic capacitor in parallel with an electrolytic type for both V and V . Route ...

Page 8

... 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. ...

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