UC3770A UC3770B High Performance Stepper Motor Drive Circuit FEATURES DESCRIPTION • Full-Step, Half-Step and Micro-Step TheUC3770AandUC3770Barehigh-performancefullbridgedriv- Capability. ers that offer higher current and lower saturation voltage than the UC3717 and the UC3770. Included in these devices are LS-TTL • Bipolar Output Current up to 2A. compatible logic inputs, current sense, monostable, thermal shut- • Wide Range of Motor Supply Voltage: down, and a power H-bridge output stage. Two UC3770As or 10–50V UC3770Bs and a few external components form a complete micro- • Low Saturation Voltage processor-controllable stepper motor power system. Unlike the UC3717, the UC3770A and the UC3770B require exter- • Wide Range of Current Control: 5mA–2A. nal high-side clamp diodes. The UC3770A and UC3770B are • Current Levels Selected in Steps or Varied identical in all regards except for the current sense thresholds. Continuously. Thresholds for the UC3770A are identical to those of the older UC3717 permitting drop-in replacement in applications where • Thermal Protection and Soft Intervention. high-side diodes are not required.Thresholds fortheUC3770B are tailored for half stepping applications where 50%, 71%, and 100% current levels are desirable. The UC3770A and UC3770B are specified for operation from 0°C to 70°C ambient. BLOCK DIAGRAM UDG-92039-1 SLUS403A - FEBRUARY 2000

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+150°C Note 1:All voltages are with respect toGnd(DILPins 4, 5, 12, 13);all currents are positive into, negative out of the specified terminal. Note 2:ConsultUnitrodeIntegrated Circuitsdatabookfor thermal limitations and considerations of packages. CONNECTION DIAGRAMS PACKAGE PIN FUNCTION DIL-16(Top View) PLCC-28(Top View) FUNCTION PIN J Or N Package Q Package Gnd 1-3 VM 4 N/C 5 AOUT 6 N/C 7 Emitters 8 Gnd 9 BOUT 10 Timing 11 VM 12 Gnd 13-17 VCC 18 I1 19 Phase 20 I0 21 N/C 22 Current 23 VR 24 N/C 25-27 Gnd 28 ELECTRICAL CHARACTERISTICS:(All tests apply withVM= 36V,VCC= 5V,VR= 5V, No Load, and 0°C<TA<70°C, unless otherwise stated, TA=TJ.) UC3770A UC3770B PARAMETER TEST CONDITIONS MIN TYP MAX MIN TYP MAX UNITS Supply VoltageVM(Pins 3, 14) 10 45 10 45 V Logic Supply VoltageVCC(Pin 6) 4.75 5 5.3 4.75 5 5.3 V Logic Supply Current ICC(Pin 6) IO= I1= H, IM= 0 15 25 15 25 mA IO= I1= L, IM= 0 18 28 18 28 mA IO= I1= H, IM= 1.3A 33 40 33 40 mA Thermal Shutdown Temperature +170 +170 °C Logic Threshold (Pins 7, 8, 9) 0.8 2.0 0.8 2.0 V Input Current Low (Pin 8) VI= 0.4V -100 -100 µA Input Current Low (Pins 7, 9) VI= 0.4V -400 -400 µA Input Current High (Pins 7, 8, 9) VI= 2.4V 10 10 µA ComparatorThreshold (Pin 10) VR= 5V, I0= L, I1= L 400 415 430 400 415 430 mV VR= 5V, I0= H, I1= L 240 255 265 290 300 315 mV VR= 5V, I0= L, I1= H 70 80 90 195 210 225 mV ComparatorInput Current (Pin 10) ±20 ±20 µA Off Time RT= 56k, CT= 820pF 25 30 35 25 30 35 ms 2

UC3770A UC3770B ELECTRICAL CHARACTERISTICS (cont.):(All tests apply withVM= 36V,VCC= 5V,VR= 5V, No Load, and 0°C<TA<70°C, unless otherwise stated, TA=TJ.) UC3770A UC3770B PARAMETER TEST CONDITIONS MIN TYP MAX MIN TYP MAX UNITS Turn Off Delay 2 2 ms Sink Driver Saturation Voltage IM= 1.0A 0.8 0.8 V IM= 1.3A 1.3 1.3 V Source Driver Saturation Voltage IM= 1.0A 1.3 1.3 V IM= 1.3A 1.6 1.6 V Output Leakage Current VM= 45V 100 100 µA T =+25°C T =+25°C A A V 1.8 5.0 – H 1.6 4.5 G A HI 1.4 –m 4.0 SAT 1.2 ICC 3.5 E VC 1.0 3.0 0.8 2.5 0.6 0.2 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 OUTPUTCURRENT–A OUTPUTCURRENT–A Figure 1.Typical source saturation voltages vs.load Figure 3.Typical supply current vs.load current. current 5 T =+25°C A W) ( 4 V 1.4 N – O W 1.2 TI 3 O A L 1.0 P AT SI 2 S 0.8 S VCE 0.6 DI 1 R 0.4 E 0 W 0.2 O 0 0.5 1 1.5 2 P 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 OUTPUTCURRENT(A) OUTPUTCURRENT–A Figure 2.Typical sink saturation voltages vs.load Figure 4.Typical power dissipation vs.output current current. UNITRODECORPORATION 7 CONTINENTALBLVD.(cid:127) MERRIMACK, NH 03054 TEL.603-424-2410 (cid:127) FAX 603-424-3460 3

PACKAGE OPTION ADDENDUM www.ti.com 6-Feb-2020 PACKAGING INFORMATION Orderable Device Status Package Type Package Pins Package Eco Plan Lead/Ball Finish MSL Peak Temp Op Temp (°C) Device Marking Samples (1) Drawing Qty (2) (6) (3) (4/5) UC3770AN ACTIVE PDIP N 16 25 Green (RoHS NIPDAU N / A for Pkg Type 0 to 70 UC3770AN & no Sb/Br) UC3770ANG4 ACTIVE PDIP N 16 25 Green (RoHS NIPDAU N / A for Pkg Type 0 to 70 UC3770AN & no Sb/Br) UC3770BN ACTIVE PDIP N 16 25 Green (RoHS NIPDAU N / A for Pkg Type 0 to 70 UC3770BN & no Sb/Br) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based flame retardants must also meet the <=1000ppm threshold requirement. (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. Addendum-Page 1

PACKAGE OPTION ADDENDUM www.ti.com 6-Feb-2020 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. Addendum-Page 2

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