NJM37717E3 datasheet, PDF - EEWORLD Datasheet

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NJM37717E3: DescriptionIC motor driver par 24emp; Categorysemiconductor Power management; File Size192KB，10 Pages; ManufacturerNew JRC; Websitehttps://www.njr.com

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NJM37717E3 Overview

IC motor driver par 24emp

NJM37717E3 Parametric

Parameter Name	Attribute value
Datasheets
NJM37717
Product Photos
EMP24-E3 PKG
Standard Package	25
Category	Integrated Circuits (ICs)
Family	PMIC - Motor, Bridge Drivers
Packaging	Tube
Motor Type - Steppe	Bipol
Motor Type - AC, DC	-
Functi	Driver - Fully Integrated, Control and Power Stage
Output Configurati	Full H-Bridge, (1) Single
Interface	Parallel
Applications	General Purpose
Current - Outpu	1A
Voltage - Supply	4.75 V ~ 5.25 V
Voltage - Load	10 V ~ 56 V
Operating Temperature	-20°C ~ 125°C
Mounting Type	Surface Mou
Package / Case	24-EMP
Supplier Device Package	24-EMP

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NJM37717

STEPPER MOTOR DRIVER

GENERAL DESCRIPTION

NJM37717 is a stepper motor diver, which consists of a LS-TTL

compatible logic input stage, a current sensor, a monostable

multivibrator and a high power H-bridge output stage with built-in

protection diodes.

NJM37717 is a high voltage version and pin compatible with

NJM3717. The output current is up to 1200mA. Two NJM37717

and a small number of external components from a complete

control and drive unit for stepper moter system.

PACKAGE OUTLINE

FEATURES

• Half-step and full-step modes

• Switched mode bipolar constant current drive

• Wide range of current control

• Wide voltage range 10 - 60 V

• Thermal overload protection

• Packages

DIP16

5 - 1200 mA

BLOCK DIAGRAM

Figure 1. Block diagram

NJM37717

Current sensor

The current sensor contains a reference voltage divider and three comparators for measuring each of the select-

able current levels. The motor current is sensed as a voltage drop across the current sensing resistor, R

, and

compared with one of the voltage references from the divider. When the two voltages are equal, the comparator

triggers the single-pulse generator. Only one comparator at a time is activated by the input logic.

Single-pulse generator

The pulse generator is a monostable multivibrator triggered on the positive edge of the comparator output. The

multivibrator output is high during the pulse time, t

off

, which is determined by the timing components R

and C

off

= 0.69 • R

• C

The single pulse switches off the power feed to the motor winding, causing the winding to decrease during t

off

.If a

new trigger signal should occur during t

off

, it is ignored.

Output stage

The output stage contains four transistors and four diodes, connected in an H-bridge. The two sinking transistors

are used to switch the power supplied to the motor winding, thus driving a constant current through the winding.

See figures 4 and 5.

Overload protection

The circuit is equipped with a thermal shut-down function, which will limit the junction temperature. The output

current will be reduced if the maximum permissible junction temperature is exceeded. It should be noted, however,

that it is not short circuit protected.

Operation

When a voltage V

is applied across the motor winding, the current rise follows the equation:

= (V

/ R) • (1 - e

-(R • t ) / L

)

R = Winding resistance

L = Winding inductance

t = time

(see figure 5, arrow 1)

The motor current appears across the external sensing resistor, R

, as an analog voltage. This voltage is fed

through a low-pass filter, R

, to the voltage comparator input (pin 10). At the moment the sensed voltage rises

above the comparator threshold voltage, the monostable is triggered and its output turns off the conducting sink

transistor.

The polarity across the motor winding reverses and the current is forced to circulate through the appropriate

upper protection diode back through the source transistor (see figure 5, arrow 2).

After the monostable has timed out, the current has decayed and the analog voltage across the sensing resistor is

below the comparator threshold level.

The sinking transistor then closes and the motor current starts to increase again, The cycle is repeated until the

current is turned off via the logic inputs.

By reversing the logic level of the phase input (pin 8), both active transistors are turned off and the opposite pair

turned on after a slight delay. When this happens, the current must first decay to zero before it can reverse. This

current decay is steeper because the motor current is now forced to circulate back through the power supply and

the appropriate sinking transistor protection diode. This causes higher reverse voltage build-up across the winding

which results in a faster current decay (see figure 5, arrow 3).

For best speed performance of the stepper motor at half-step mode operation, the phase logic level should be

changed at the same time the current-inhibiting signal is applied (see figure 6).

NJM37717E3 Related Products

	NJM37717E3	NJM37717D2
Description	IC motor driver par 24emp	IC motor driver par 16dip
Standard Package	25	25
Category	Integrated Circuits (ICs)	Integrated Circuits (ICs)
Family	PMIC - Motor, Bridge Drivers	PMIC - Motor, Bridge Drivers
Packaging	Tube	Tube
Motor Type - Steppe	Bipol	Bipol
Functi	Driver - Fully Integrated, Control and Power Stage	Driver - Fully Integrated, Control and Power Stage
Output Configurati	Full H-Bridge, (1) Single	Full H-Bridge, (1) Single
Interface	Parallel	Parallel
Applications	General Purpose	General Purpose
Current - Outpu	1A	1A
Voltage - Supply	4.75 V ~ 5.25 V	4.75 V ~ 5.25 V
Voltage - Load	10 V ~ 56 V	10 V ~ 56 V
Operating Temperature	-20°C ~ 125°C	-20°C ~ 125°C
Mounting Type	Surface Mou	Through Hole
Package / Case	24-EMP	16-DIP (0.325", 8.25mm)
Supplier Device Package	24-EMP	16-DIP

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