NJM37770E2

NJM37770 STEPPER MOTOR DRIVER ■ GENERAL DESCRIPTION NJM37770 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 NJM37770 is a high power version and pincompatible with the NJM37717 and also NJM37770 is a high voltage version with NJM3770A. Two NJM37770 and a small number of external components form a complete control and drive unit stepper motor systems. ■ FEATURES ● Half-step and full-step operation ● Switched mode bipolar constant current drive ■ PACKAGE OUTLINE NJM37770E2 ( SOP20-E2 ) ● Wide range of current control ● Wide voltage range ● Thermal overload protection ● Packages 5 to 1500mA 10 to 60 V SOP20-E2 JEDEC 300mil ■ BLOCK DIAGRAM Figure 1. Block diagram Ver.2012-06-29 -1- NJM37770 ■ PIN CONFIGURATION Figure 2. Pin configuration ■ PIN DESCRIPTION SOP 1 2 3,18 4-7 14-17 8 9 10 11 12 13 19 20 Symbol MB T VMM GND VCC I1 Phase I0 C VR MA E Description Motor output B, Motor current flows from MA to MB when Phase is high. Clock oscillator. Timing pin connect a 56 kΩ resistor and a 820 pF in parallel between T and Ground. Motor supply voltage, 10 to 40 V. Pin 3 and pin 18 should be wired together. Ground and negative supply. Note these pins are used for heatsinking. Make sure that all ground pins are soldered onto a suitable large copper ground plane for efficient heat sinking. Logic voltage supply normally +5 V. Logic input. It controls, t...