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| UC3770A UC3770B High Performance Stepper Motor Drive Circuit FEATURES * * * * * * * Full-Step, Half-Step and Micro-Step Capability. Bipolar Output Current up to 2A. Wide Range of Motor Supply Voltage: 10-50V Low Saturation Voltage Wide Range of Current Control: 5mA-2A. Current Levels Selected in Steps or Varied Continuously. Thermal Protection and Soft Intervention. DESCRIPTION The UC3770A and UC3770B are high-performance full bridge drivers that offer higher current and lower saturation voltage than the UC3717 and the UC3770. Included in these devices are LS-TTL compatible logic inputs, current sense, monostable, thermal shutdown, and a power H-bridge output stage. Two UC3770As or UC3770Bs and a few external components form a complete microprocessor-controllable stepper motor power system. Unlike the UC3717, the UC3770A and the UC3770B require external high-side clamp diodes. The UC3770A and UC3770B are identical in all regards except for the current sense thresholds. Thresholds for the UC3770A are identical to those of the older UC3717 permitting drop-in replacement in applications where high-side diodes are not required. Thresholds for the UC3770B are tailored for half stepping applications where 50%, 71%, and 100% current levels are desirable. The UC3770A and UC3770B are specified for operation from 0C to 70C ambient. BLOCK DIAGRAM UDG-92039-1 SLUS403A - FEBRUARY 2000 Powered by ICminer.com Electronic-Library Service CopyRight 2003 UC3770A UC3770B ABSOLUTE MAXIMUM RATINGS Logic Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V Output Supply Voltage, VMM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50V Logic Input Voltage (Pins 7, 8, 9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6V Analog Input Voltage (Pin 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC Reference Input Voltage (Pin 11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V Logic Input Current (Pins 7, 8, 9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10mA Analog Input Current (Pins 10, 11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10mA Output Current (Pins 1, 15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2A Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150C Note 1: All voltages are with respect to Gnd (DIL Pins 4, 5, 12, 13); all currents are positive into, negative out of the specified terminal. Note 2: Consult Unitrode Integrated Circuits databook for thermal limitations and considerations of packages. CONNECTION DIAGRAMS DIL-16 (Top View) J Or N Package PLCC-28 (Top View) Q Package PACKAGE PIN FUNCTION FUNCTION PIN Gnd VM N/C AOUT N/C Emitters Gnd BOUT Timing VM Gnd VCC I1 Phase I0 N/C Current VR N/C Gnd 1-3 4 5 6 7 8 9 10 11 12 13-17 18 19 20 21 22 23 24 25-27 28 ELECTRICAL CHARACTERISTICS: (All tests apply with VM = 36V, VCC = 5V, VR = 5V, No Load, and 0C Powered by ICminer.com Electronic-Library Service CopyRight 2003 UC3770A UC3770B ELECTRICAL CHARACTERISTICS (cont.): (All tests apply with VM = 36V, VCC = 5V, VR = 5V, No Load, and 0C TA = +25C 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 OUTPUT CURRENT - A Figure 1. Typical source saturation voltages vs. load current Figure 3. Typical supply current vs. load current. POWER DISSIPATION (W) TA = +25C VCE SAT LOW - V 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 OUTPUT CURRENT - A 5 4 3 2 1 0 0 0.5 1 1.5 2 OUTPUT CURRENT (A) Figure 2. Typical sink saturation voltages vs. load current Figure 4. Typical power dissipation vs. output current. UNITRODE CORPORATION 7 CONTINENTAL BLVD. * MERRIMACK, NH 03054 TEL. 603-424-2410 * FAX 603-424-3460 3 Powered by ICminer.com Electronic-Library Service CopyRight 2003 |
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