High Performance Stepper Motor Drive Circuit
February 1999
PBL 3770A High Performance Stepper Motor Drive Circuit
Description
PBL 3770A is a bipolar monolithic circ...
Description
February 1999
PBL 3770A High Performance Stepper Motor Drive Circuit
Description
PBL 3770A is a bipolar monolithic circuit intended to control and drive the current in one winding of a stepper motor. It is a high power version of PBL 3717 and special care has been taken to optimize the power handling capability without suffering in reliability. The circuit consists of a LS-TTL compatible logic input stage, a current sensor, a monostable multivibrator and a high power H-bridge output stage. The circuit is pin-compatible with the PBL 3717 industry-standard driver. Two PBL 3770A and a small number of external components form a complete control and drive unit for LS-TTL or microprocessor-controlled stepper motor systems.
Key Features
Half-step and full-step operation. Switched mode bipolar constant current drive Wide range of current control 5 -1800 mA. Wide voltage range 10 - 45 V. Designed for unstabilized motor supply voltage. Current levels can be selected in steps or varied continuously. Thermal overload protection.
VCC
Schmitt Trigger Time Delay
VMM
VMM
Phase I
1
1
≥1
≥1
P
B
L B A P 70 37
MA I0 V
R
MB
&
+ – + – + – GND
&
&
&
≥1
≥1
L
Monostable t off = 0.69 RT CT Current Sensor
37
PBL 3770A
C T E
16-pin plastic batwing DIP 28-pin plastic PLCC package 20-pin SO
Figure 1. Block diagram.
1
P
B
L
37
Output Stage
70
A
70
A
PBL 3770A
Maximum Ratings
Parameter Pin no. [DIL package] Symbol Min Max Unit
Voltage Logic supply Motor sup...
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