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PBL3776-1

Dual Controller IC for High Current Stepper Motor Applications

Ericsson  

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

PBL3776/1

VBB2

T2BU

T2AU

T2AL

T2BL

24-pin plastic DIP package, narrow

1

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