NJM3770A

NJM3770A STEPPER MOTOR DRIVER s GENERAL DESCRIPTION NJM3770A is a stepper motor driver, which consists of a LS-TTL compatible logic input stage, a current sensor, a monostable multivibrator and a high power H-bridge output stage. The NJM3770A is a high power version and pincompatible with the NJM3717.Two NJM3770A and a small number of external components form a complete control and drive unit stepper motor systems. s PACKAGE OUTLINE NJM3770AD3 NJM3770AE2 s EATURES Half-step and full-step operation Switched mode bipolar constant current drive Wide range of current control 5 -1800 mA Wide voltage range 10 - 45 V Thermal overload protection Packages DIP16 (Batwing) / PLCC28 / EMP20 NJM3770AFM2 s BLOCK DIAGRAM VCC Schmitt Trigger Time Delay VMM VMM Phase I 1 1 ≥1 ≥1 MA I0 V R MB & + – + – + – GND & & & ≥1 ≥1 Output Stage Monostable t off = 0.69 RT CT Current Sensor NJM3770A C T E Figure 1. Block diagram NJM3770A s PIN CONFIGURATIONS 3 GND 2 GND 1 GND 28 GND 4 V MM MB 1 T 2 VMM 3 GND 4 GND 5 GND 6 GND 7 20 19 18 17 E MA VMM GND GND GND GND VR C MB 1 T 2 VMM 3 GND 4 GND 5 VCC 6 I1 7 Phase 8 16 E 15 M A 14 VMM N/C 5 MA 6 27 N/C 26 N/C 25 N/C 24 V R NJM 3770AE2 16 15 14 13 12 11 NJM 3770AD3 13 GND 12 GND 11 V R 10 C 9 I0 N/C 7 E 8 GND 9 M B 10 T 11 NJM 3770AFM2 23 C 22 N/C 21 I 0 20 Phase 19 I1 VCC 8 I1 9 Phase 10 V MM 12 GND 13 GND 14 GND 15 GND 16 GND 17 I0 Figure 2. Pin configurations s PIN DESCRIPTION EMP DIP ...