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PBL3717A-PBL-3717A-PBL3717A.
STEPPER MOTOR DRIVER
BL3717AApril 1993
STEPPER MOTOR DRIVER FULL STEP - HALF STEP - QUARTER STEP
OPERATING MODE. BIPOLAR OUTPUT CURRENT UP TO 1 A. FROM 10 V UP TO 46 V MOTOR SUPPLY
VOLTAGE. LOW SATURATION VOLTAGE WITH INTE-
GRATED BOOTSTRAP. BUILT IN FAST PROTECTION DIODES. EXTERNALLY SELECTABLE CURRENT
LEVEL. OUTPUT CURRENT LEVEL DIGITALLY OR
ANALOGUE CONTROLLED. THERMAL PROTECTION WITH SOFT INTER-
VENTION
DESCRIPTIONThe PBL3717A is a monolithic IC which controls and
drives one phase of a bipolar stepper motor with
chopper control of the phase current. Current levels
may be selected in three steps by means of two logic
inputs which select one of three current compara-
tors. When both of these inputs are high the device
is disabled. A separate logic input controls the direc-
tion of current flow.
A monostable, programmed by an external RC net-
work, sets the current decay time.
The power section is a full H-bridge driver with four
internal clamp diodes for current recirculation. An
external connection to the lower emitters is available
for the insertion of a sensing resistor. Two
PBL3717As and few external components form a
complete stepper motor drive subsystem.
The raccomended operating ambient temperature
ranges is from 0 to 70 °C.
The PBL3717A is supplied in a 12 + 2 + 2 lead Pow-
erdip package.
PIN CONNECTION (top view)1/11
PIN FUNCTIONS
TRUTH TABLE
PBL3717A2/11
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
PBL3717A3/11
ELECTRICAL CHARACTERISTICS(refer to the test circuit VS = 36V, VSS = 5V, Tamb = 25o C unless otherwise specified)
LOGIC INPUTS
COMPARATORS
SOURCE DIODE-TRANSISTOR PAIR
SINK DIODE-TRANSISTOR PAIR
PBL3717A4/11
Figure 1 : Test and Application Circuit
Figure 2 : Waveforms with MA Regulating (phase = 0)
PBL3717A5/11
