PT5120 Stepping Motor Driver IC DESCRIPTION FEATURES The PT5120 is a PWM constant-current type stepping motor driver IC designed for sinusoidal-input micro-step control of stepping motors. The PT5120 can be used in applications that require 2-phase, 1-2-phase, W1-2-phase and 2W1-2 phase excitation modes. The PT5120 is capable of forward and reverse driving of a 2-phase bipolar stepping motor using only a clock signal. APPLICATIONS DSLR Interchangeable Lens Motor power supply voltage: VM = 15 V (max) Control power supply voltage: VCC = 2.7 to 6 V Output current: Iout ≤ 0.8 A (max) Output ON-resistance: Ron = 1.5 Ω (upper and lower sum@VM = 7 V) Decoder that enables microstep control with the clock signal Selectable phase excitation modes (2, 1-2, W1-2 and 2W1-2) Internal pull-down resistors on inputs: 200 KΩ (typ.) Output monitor pin (MO) Thermal shutdown (TSD) and under voltage lockout (UVLO) circuits Small surface-mount package (TSSOP20 173mil: 0.65 mm lead pitch) BLOCK DIAGRAM GND STBY Vcc 15 2 1 MO 16 STANBY UVLO (2V) M1 4 M2 5 Pre Drive + - H-Bridge A 13 AO1 11 AO2 12 RFA PWM Timer u step Decoder CW/CCW 7 CK 20 RESET 14 ENABLE 19 DCY 18 2 1-2 W1-2 2w1-2 Phase TSD B.G TQ OSC Vref 2 switches 0.125V,0.5V 17 3 Pre Drive + - H-Bridge B 6 VM 10 BO1 8 BO2 9 RFB PWM Timer OSC Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan PT5120 ORDER INFORMATION Valid Part Number Package Type Top Code PT5120-TX TSSOP 20, 173mil PT5120-TX PIN CONFIGURATION V1.1 2 September 2014 PT5120 PIN DESCRIPTION Pin Name VCC I/O Power Supply STBY I OSC I M1 I M2 I VM Power Supply CW/CCW I BO2 O RFB O BO1 O AO2 O RFA O AO1 O RESET I GND GND MO O TQ I Description Pin No. Power supply pin for logic block 1 Standby input, See the Input Signals and Operating Modes table. Connection pin for an external capacitor used for internal oscillation Excitation mode setting input 1, See the Excitation Mode Settings table. Excitation mode setting input 2, See the Excitation Mode Settings table. 2 3 4 5 Power supply pin for output 6 Rotation direction select input, See the Input Signals and Operating Modes table. B-phase output 2, Connect BO2 to a motor coil pin. Connection pin for a B-phase output current detection resistor B-phase output 1, Connect BO1 to a motor coil pin. A-phase output 2, Connect AO2 to a motor coil pin. Connection pin for an A-phase output current detection resistor A-phase output 1 Connect AO1 to a motor coil pin. Reset input See the Input Signal and Operating Modes table. Ground 7 8 9 10 11 12 13 14 15 Monitor output, Initial state: MO = Low (open drain, pulled up by an external resistor) Vref setting input See the Vref Voltage Setting table. 16 17 Decay setting input, DCY I ENABLE I CK I V1.1 See the Fast-Decay Time Inserted During the Current Decay Period table. Enable input, See the Input Signal and Operating Modes table. Clock input 3 18 19 20 September 2014 PT5120 IMPORTANT NOTICE Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No circuit patent licenses are implied. Princeton Technology Corp. 2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan Tel: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw V1.1 29 September 2014