NJM3773 New Japan Radio, NJM3773 Datasheet
NJM3773
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NJM3773 Summary of contents
Page 1
... GENERAL DESCRIPTION The NJM3773 is a switch-mode (chopper), constant-current driver with two channels: one for each winding of a two-phase stepper motor. The NJM3773 is also equipped with a Disable input to simplify half-stepping operation. The circuit is well suited for microstepping applications together with an external micro controller. The current control inputs are low current, high impedance inputs, which allows the use of unbuffered DAC or external high resistive resistor divider network ...
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... Dis when Phase is HIGH when Phase is HIGH NJM3773 NJM3773FM2 GND when Phase is HIGH ground when Phase is HIGH and V should be connected together. ...
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... To prevent erroneous switching due to switching transients at turn-on, the NJM3773 includes a digital filter. The clock oscillator provides a blanking pulse which is used for digital filtering of the voltage transient across the current sensing resistor during turn-on. ...
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... I M Logic — 17 GND Pin no. refers to DIP package NJM3773 Symbol Min -0 -0 -850 -55 stg ...
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... Symbol Conditions Rth DIP package. J-GND Rth DIP package. Note 2. J-A Rth PLCC package. J-GND Rth PLCC package. Note 2. J-A Rth EMP package J-GND Rth EMP package J-A 2 PCB copper area with free air convection 23.0 kHz. NJM3773 Min Typ - 2 mA 160 - 1.1 2 ...
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... GND ( Figure 7. Microstepping system where a microcontroller including DACs provides analog current control voltages as well as digital signals to the NJM3773. . The peak current through the sensing resistor (and the motor winding) can be should be selected for maximum motor current. Be should not to exceed the S and C), the control range may be increased to 0 ...
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... EMP –100% –140% I MA2 140% 100% 35 28-pin –100% PLCC –140% Figure 9. Stepping modes NJM3773 . S and C at the RC-pin The value limited kohm. The T T into pin logic LOW gives a current flow Full step mode ...
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... It is not possible to use a motor that is rated for the same voltage as the actual supply voltage. Only rated current needs to be considered. Typical motors to be used together with the NJM3773 have a voltage rating while the supply voltage usually ranges from ...
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... Modifying the current levels must be done by bringing the reference voltage up (or down) from its nominal value correspondingly. This can be done by using DACs or simple resistor divider networks. The NJM3773 is designed to handle about 1.4 times higher current in one channel on mode, for example 2 x 500 mA in the full-step position, and 1 x 700 mA in the half-step position ...