CS3717A

Features:

· Full/Half /Quarter Step Operation
· Output Current Up to 1 A
· Motor Supply Voltage 10V to 46V
· Integrated Bootstrap Lowers Saturation Voltage
· Built In Protection Diodes
· Externally Selectable Current Level
· Digital or Analog Control of Output Current Level
· Thermal Overload Protection
· Minimum External Components


Pinout




Specifications

Power Supply Voltage (VDDA, VDDB) ....................................................... 50V
Logic Supply Voltage (VCC).........................................................................7V
Logic Input Voltage (IN0, IN1, DIRECTION)..............................................   .6V
Comparator Input.................................................................................... VCC
Reference Input Voltage........................................................................... 15V
Output Current (DC Operation)............................................................... 1.2A
Storage Temperature .......................................................... .-55 to +150
Operating Junction Temperature.............................................-40 to +150
Lead Temperature Soldering
    Wave Solder(through hole styles only) ...........     .10 sec. max, 260¡C peak


Description

The CS3717A 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 comparators. When both of these inputs are high the device is disabled. A separate logic input controls the direction of current flow. A monostable, programmed by an external RC network, 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 CS3717AÕs and several external components form a complete stepper motor drive subsystem.

CS3717A recommended operating ambient temperature range is from 0 to 70¡C.

The CS3717A is supplied in a 16 lead PDIP.