SLA7052M

Driver Supply Voltage, V_BB ................. 46 V
Load Supply Voltage, V_M ................... 46 V
Output Current, IO ........................... 3.0 A*
Logic Supply Voltage, V_DD ................ 7.0 V
Logic Input Voltage Range,
V_I .............................. -0.3 V to V_DD+ 0.3 V
Sense Voltage, V_S ........................ ±2.0 V†
Reference Input Voltage Range,
V_REF .......................... -0.3 V to V_DD+ 0.3 V
Package Power Dissipation,
PD ............................................ See Graph
Junction Temperature, T_J ............ +150°C
Operating Temperature Range,
T_A ................................. -20°C to +85°C
Storage Temperature Range,
T_S ............................... -30°C to +150°C
* Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set ofconditions, do not exceed the specified current rating or junction temperature.
† Internal filtering provides protection against transients during the first 1 µs of the current-sense pulse.

Combining SLA7052M low-power CMOS logic with high-current, high-voltage power FET outputs, the SLA7052M translator/driver provides complete control and drive for a two-phase unipolar stepper motor with internal fixed off time, pulse-width modulation (PWM) control of the output current in a power multi-chip module (PMCM™).

The SLA7052M CMOS logic section provides the sequencing logic, direction, full/half-step control, synchronous/asynchronous PWM operation, and a "sleep" function. The minimum CLOCK input is an ideal fit for applications where a complex µP is unavailable or overburdened. TTL or LSTTL may require the use of appropriate pull-up resistors to ensure a proper input-logic high. For PWM current control, the maximum output current is determined by the user's selection of a reference voltage and sensing resistor. The NMOS outputs are capable of sinking up to 3 A and withstanding 46 V in the off state. Ground-clamp and flyback diodes provide protection against inductive transients. Special power-up sequencing is not required.

Full-step (2 phase) and half-step operation are externally selectable. Two-phase drive energizes two adjacent phases in each detent position (AB-BC-CD-DA). This SLA7052M sequence mode offers an improved torquespeed product, greater detent torque, and is less susceptable to motor resonance. Half-step excitation alternates between the one-phase and two-phase modes (A-AB-B-BC-C-CD D-DA), providing an eight-step sequence.

The SLA7052M is supplied in an 18-pin single in-line power-tab package with leads formed for vertical mounting (suffix LF871) or horizontal mounting (suffix LF872). The tab is at ground potential and needs no insulation. For high-current or high-frequency applications, external heat sinking may be required. This device is rated for continuous operation between -20°C and +85°C.