NJM3770AD3原理图各脚功能电路原理芯片引脚定义引脚图及功能-中国IC网-芯三七

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产品型号NJM3770AD3的概述

NJM3770AD3 概述 NJM3770AD3是一款高性能的电压比较器，由日本的Nihon Dempa Kogyo Co., Ltd（日本电波工业株式会社）制造。该芯片广泛应用于各种电子设备中，尤以信号处理和电源管理领域为主，其设计旨在实现快速的电压比较和高精度的电压监测。 NJM3770AD3 的详细参数 NJM3770AD3的主要特点包括： - 演算速度：该芯片的响应时间极快，通常在数微秒的范围内，能够支持高速的信号处理需求。 - 输入电压范围：NJM3770AD3在一个广泛的输入电压范围内能够正常工作，可接受的输入电压范围通常为-0.3V至+30V。 - 输出类型：该芯片采用开集电极输出，适合与多种类型的负载一起使用，包括LED和继电器等。 - 供电电压：NJM3770AD3的供电电压范围从4.5V到30V，包括常见的单电源和双电源配置。 - 温度范围：NJM3770AD3能够...

产品型号NJM3770AD3的Datasheet PDF文件预览

NJM3770A

STEPPER MOTOR DRIVER

■ GENERAL DESCRIPTION

■ PACKAGE OUTLINE

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 pin-

compatible with the NJM3717.Two NJM3770A and a small

number of external components form a complete control

and drive unit stepper motor systems.

NJM3770AD3

NJM3770AE2

■ 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

NJM3770AFM2

• Thermal overload protection

• Packages DIP16 (Batwing) / PLCC28 / EMP20

■ BLOCK DIAGRAM

Schmitt

Trigger

Time

Delay

Phase

≥1

–

Output Stage

–

Monostable

t_off= 0.69 • R_T• C_T

–

GND

Current Sensor

NJM3770A

Figure 1. Block diagram

NJM3770A

■ PIN CONFIGURATIONS

M_B

M_A

N/C

25 N/C

GND

NJM

3770AD3

N/C

GND

13 GND

12 GND

NJM

3770AE2

NJM

3770AFM2

22 N/C

20 Phase

GND

Phase

Figure 2. Pin configurations

■ PIN DESCRIPTION

EMP

DIP

PLCC

Symbol

M_B

Description

Motor output B, Motor current flows from M_Ato M_Bwhen Phase is high.

Clock oscillator. Timing pin connect a 56 kΩ resistor and a 820 pF in

parallel between T and Ground.

3,14

12,4

V_MM

Motor supply voltage, 10 to 40 V. Pin 3(12) and pin 14(4) should be wired to

gether.

4-7,

4,5,

1-3,9,

GND

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.

14-18

12,13

13-17,28

V_CC

I₁

Logic voltage supply normally +5 V.

Logic input. It controls, together with the I0 input, the current level in the output

stage.

The controllable levels are fixed to 100, 60, 20, 0%.

Phase

I₀

Controls the direction of the motor current of M_Aand M_Boutputs.

Motor current flows from M_Ato M_Bwhen the phase input is high.

Logic input. It controls, together with the I₁input, the current level in the output

stage.

The controllable levels are fixed to 100, 60, 20, 0%.

Comparator input. This input senses the instantaneous voltage across the

sensing resistor, filtered through a RC Network.

V_R

Reference voltage. Controls the threshold voltage of the comparator and hence

the output current. Input resistance: typically 6.8 kΩ ± 20%.

M_A

Motor output A, Motor current flows from M_Ato M_Bwhen Phase is high.

Common emitter. Connect the Sense resistor between this pin and ground.

NJM3770A

■ FUNCTIONAL DESCRIPTION

The NJM3770A is intended to drive a bipolar constant current through one winding of a 2-phase stepper motor.

Current control is achieved through switched-mode regulation, see figure 3 and 4.

Three different current levels and zero current can be selected by the input logic.

The circuit contains the following functional blocks:

• Input logic

• Current sense

• Single-pulse generator

• Output stage

Input logic

Phase input

The phase input determines the direction of the current in the motor winding. High input forces the current from

terminal M_Ato M_Band low input from terminal M_Bto M_A. A Schmitt trigger provides noise immunity and a delay

circuit eliminates the risk of cross conduction in the output stage during a phase shift.

Half- and full-step operation is possible.

External recirculation

diodes

200 mA/div

1 ms/div

Motor Current

100µs/div

Time

Fast Current Decay

Slow Current Decay

Figure 4. Motor current (I_M),

Vertical : 200 mA/div,

Horizontal: 1 ms/div,

Figure 3. Output stage with current paths

for fast and slow current decay.

expanded part 100 µs/div.

NJM3770A

Current level selection.

The status of I₀and I₁inputs determines the current level in the motor winding. Three fixed current levels can be

selected according to the table below.

Motor current

I₀I₁

High level

100%

Medium level 60%

Low level

20%

Zero current

The specific values of the different current levels are determined by the reference voltage V_Rtogether with the

value of the sensing resistor R_S.

The peak motor current can be calculated as follows:

i_m= (V_R• 0.080) / R_S[A], at 100% level

The motor current can also be continuously varied by modulating the voltage reference input.

Current sensor

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

current levels. The motor current is sensed as a voltage drop across the current sensing resistor, R_S, 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_Tand C_T.

t_off= 0.69 • R_T• C_T

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 two diodes, connected in an H-bridge. Note that the upper recircula-

tion diodes are connected to the circuit externally. 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 3 and 4.

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

• t ) / L

i_m= (V_MM/ R) • (1 - e^-(R

R = Winding resistance

L = Winding inductance

t = time

)

(see figure 3, arrow 1)

The motor current appears across the external sensing resistor, R_S, as an analog voltage. This voltage is fed

through a low-pass filter, R_CC_C, 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 appropri-

ate upper protection diode back through the source transistor (see figure 3, 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 turns on and the motor current starts to increase

again, The cycle is repeated until the current is turned off via the logic inputs.When both I₁and I₀are high, all four

transistors in the output H-bridge are turned off, which means that inductive current recirculates through two opposite

free-wheeling diodes (see figure 3, arrow 3). this method of turning off the current results in a faster current decay

than if only one transistor was turned off and will therefore improve speed performance in half-stepping mode.

NJM3770A

■ ABSOLUTE MAXIMUM RATINGS

Parameter

Pin no. [DIP package]

Symbol

Min

Max

Unit

Voltage

Logic supply

V_CC

V_MM

V_I

Motor supply

3, 14

7,8,9

Logic inputs

-0.3

Comparator input

Reference input

Current

V_C

V_CC

V_R

Motor output current

Logic inputs

1, 15

7,8,9

10,11

I_M

I_I

-1800

-10

+1800

Analog inputs

Temperature

Operating junction temperature

Storage temperature

I_A

-10

T_j

-40

-55

+150

°C

T_s

■ RECOMMENDED OPERATING CONDITIONS

Parameter

Symbol

Min

Typ

Max

Unit

Logic supply voltage

Motor supply voltage

Motor output current

Junction temperature

Rise time logic inputs

Fall time logic inputs

V_CC

V_MM

I_M

4.75

5.25

-1500

-20

+1500

+125

°C

µs

T_J

t_r

t_f

– V

Normalized

[18]

Schmitt

Trigger

Time

Delay

Phase

≥1

off

1/2

Output Stage

–

Monostable

t_off0.69 • R_T• C_T

–

4, 5,

12, 13

GND

Current Sensor

NJM3770A

Pin no. refers

to DIP-package

820 pF

0.5

820 pF

f =

D =

+ t

off

Figure 6. Definition of terms

Figure 5. Definition of symbols

NJM3770A

■ ELECTRICAL CHARACTERISTICS

Electrical characteristics over recommended operating conditions. C_T= 820 pF, R_T= 56 kohm

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

General

Supply current

I_CC

V_MM= 20 to 40 V, I₀= I₁= HIGH.

V_MM= 20 to 40 V, I₀= I₁= LOW,

f_s= 23 kHz

Total power dissipation

P_D

f_s= 28 kHz, I_M= 1.0A, V_MM= 36 V

Note 2, 4.

f_s= 24 kHz, I_M= 1.0A, V_MM= 12 V

Note 2, 4.

f_s= 28 kHz, I_M= 1.3A, V_MM= 36 V

Note 3, 4.

f_s= 28 kHz, I_M= 1.5A, V_MM= 36 V

Note 3, 4.

1.9

1.7

2.7

3.5

2.3

2.1

3.2

Turn-off delay

Thermal shutdown junction temperature

t_d

T_a= +25°C, dV_C/dt ≥ 50 mV/µs.

2.5

µs

°C

170

Logic Inputs

Logic HIGH input voltage

Logic LOW input voltage

Logic HIGH input current

Logic LOW input current

V_IH

V_IL

I_IH

2.0

0.8

µA

V_I= 2.4 V

V_I= 0.4 V

I_IL

-0.4

Analog Inputs

Comparator threshold voltage

Input current

V_CH

V_CM

V_CL

I_C

V_R= 5.0 V, I₀= I₁= LOW

V_R= 5.0 V, I₀= HIGH, I₁= LOW

V_R= 5.0 V, I₀= LOW, I₁= HIGH

400

240

415

250

430

265

µA

-20

Motor Outputs

Lower transistor saturation voltage

I_M= 1.0A

I_M= 1.3A

I_M= 1.0A

I_M= 1.3A

I_M= 1.0A

I_M= 1.3A

I₀= I₁= HIGH, T_a= +25°C

0.5

0.8

1.3

1.5

1.1

1.3

0.8

1.3

1.6

1.8

1.3

1.6

100

Lower diode forward voltage drop

Upper transistor saturation voltage

Output leakage current

µA

Monostable

Cut off time

t_off

V_MM= 10 V, t_on≥ 5 µs

µs

■ THERMAL CHARACTERISTICS

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

Thermal resistance

Rth_J-GNDDIP package.

Rth_J-A

Rth_J-GNDPLCC package.

Rth_J-A

Rth_J-GNDEMP package.

Rth_J-A

°C/W

DIP package. Note 2.

PLCC package. Note 2.

EMP package.

Notes

1. All voltages are with respect to ground. Currents are positive into, negative out of specified terminal

2. All ground pins soldered onto a 20 cm²PCB copper area with free air convection Ta=+25°C

3. DIP package with external heatsink (Staver V7) and minimal copper area. Typical Rth_J-A= 27.5°C/W. T_a= +25°C

4. Not covered by final test program

NJM3770A

■ APPLICATIONS INFORMATION

Motor selection

Some stepper motors are not designed for continuous operation at maximum current. As the circuit drives a

constant current through the motor, its temperature can increase, both at low- and high-speed operation.

Some stepper motors have such high core losses that they are not suited for switched-mode operation.

Interference

As the circuit operates with switched-mode current regulation, interference-generation problems can arise in some

applications. A good measure is then to decouple the circuit with a 0.1 µF ceramic capacitor, located near the

package across the power line V_MMand ground.

Also make sure that the V_Refinput is sufficiently decoupled. An electrolytic capacitor should be used in the +5 V

rail, close to the circuit.

The ground leads between R_S, C_Cand circuit GND should be kept as short as possible. This applies also to the

leads connecting R_Sand R_Cto pin 16 and pin 10 respectively.

In order to minimize electromagnetic interference, it is recommended to route M_Aand M_Bleads in parallel on the

printed circuit board directly to the terminal connector. The motor wires should be twisted in pairs, each phase

separately, when installing the motor system.

Unused inputs

Unused inputs should be connected to proper voltage levels in order to obtain the highest possible noise immunity.

Ramping

A stepper motor is a synchronous motor and does not change its speed due to load variations. This means that the

torque of the motor must be large enough to match the combined inertia of the motor and load for all operation

modes. At speed changes, the requires torque increases by the square, and the required power by the cube of the

speed change. Ramping, i.e., controlled acceleration or deceleration must then be considered to avoid motor pull-

out.

V_CC, V_MM

The supply voltages, V_CCand V_MM, can be turned on or off in any order. Normal dv/dt values are assumed.

Before a driver circuit board is removed from its system, all supply voltages must be turned off to avoid destruc-

tive transients being generated by the motor.

Switching frequency

The motor inductance, together with the pulse time, t_off, determines the switching frequency of the current regulator.

The choice of motor may then require other values on the R_T, C_Tcomponents than those recommended in figure 3,

to obtain a switching frequency above the audible range. Switching frequencies above 40 kHz are not recom-

mended because the current regulation can be affected.

(+5V)

STEPPER

MOTOR

3,14

Phase

NJM3770A

GND

4, 5

12, 13

56 k

820pF

0.5

820pF

(+5V)

3,14

Phase

NJM3770A

GND

4, 5

12, 13

Diodes are

56 k

UF 4001 or

BYV27

820pF

100

≤

820pF

0.5

Figure 7. Typical stepper motor driver application with NJM3770A

NJM3770A

Analog control

As the current levels can be continuously controlled by modulating the V_Rinput, limited microstepping can be

achieved.

Sensor resistor

The R_Sresistor should be of a noninductive type power resistor. A 0.5 ohm resistor, tolerance ≤ 1%, is a good

choice for 800 mA max motor current at V_R= 5V.

The peak motor current, i_m, can be calculated by using the formula:

i_m= (V_R• 0.080) / R_S[A], at 100% level

External recirculation diodes

Recirculation diodes must be connected across each motor terminal and the supply voltage, V_MM. The anodes shall

be connected to the motor terminals and the cathodes to the V_MMvoltage. Ultra-fast recovery diodes should be

used for maximum performance and reliability.

I _0A

I _1A

Ph_A

Thermal resistance [°C/W]

Ph_B

I _0B

16-pin

DIP

I _1B

I _MA

100%

60%

–20%

–60%

–100%

20-pin

EMP

I _MB

100%

60%

20%

–60%

–100%

PCB copper foil area [cm²]

PLCC package

DIP package

Full step position

Half step position

28-pin

PLCC

Stand by mode

at 20 %

Half step mode at 100 %

Full step mode at 60 %

Figure 8. Copper foil used as a heatsink

Figure 9. Principal operating sequence.

NJM3770A

Heatsinking

The junction temperature of the chip highly effects the lifetime of the circuit. In high-current applications, the

heatsinking must be carefully considered.

The Rth_j-aof the NJM3770A can be reduced by soldering the ground pins to a suitable copper ground plane on

the printed circuit board (see figure 8) or by applying an external heatsink type V7 or V8, see figure 10.

The diagram in figure 15 shows the maximum permissible power dissipation versus the ambient temperature in

°C, for heatsinks of the type V7, V8, or a 20 cm²copper area respectively. Any external heatsink or printed circuit

board copper must be connected to electrical ground.

For motor currents higher than approx 600 mA, some form of heatsinking is recommended to assure optimal

reliability.

The diagrams in figures 14 and 15 can be used to determine the required heatsinking of the circuit. In some

systems, forced-air cooling may be available to reduce the temperature rise of the circuit.

Figure 10. Heatsinks, Staver, type V7 and V8

by Columbia-Staver UK

NJM3770A

■ TYPICAL CHARACTERISTICS

V_Sat(V)

V_F(V)

V_Sat(V)

1.8

1.6

1.4

1.2

1.0

1.6

1.4

1.2

1.0

1.6

1.4

1.2

T = 25°C

T = 125°C

T = 125

°C

T = 25°C

1.0

T = 125°C

T = 25°C

.40

.80

I_M(A)

1.2

1.6

.40

.80

I_M(A)

1.2

1.6

.40

.80

I_M(A)

1.2

1.6

Figure 11. Typical source saturation

vs. output current

Figure 12. Typical lower diode

voltage drop vs. recirculating current

Figure 13. Typical sink saturation

vs. output current

P_D(W)

V_MM= 36 V

3.0

2.5

2.0

With Staver V8 (37.5

4.0

PCB heatsink (40

3.0

C/W)

1.5

1.0

2.0

1.0

C/W)

MM = 12 V

.50

1.0

1.5

100

150

I_M(A)

T_Amb(°C)

Figure 14. Typical power dissipation

vs. motor current

Figure 15. Allowable power dissipation

vs. ambient temperature

The specifications on this databook are only

given for information , without any guarantee

as regards either mistakes or omissions.

The application circuits in this databook are

described only to show representative

usages of the product and not intended for

the guarantee or permission of any right

including the industrial rights.

NJM3770AD3相关文章

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NJM3770AD3产品参数

型号:	NJM3770AD3
生命周期：	Obsolete
零件包装代码：	DIP
包装说明：	DIP,
针数：	16
Reach Compliance Code：	compliant
ECCN代码：	EAR99
HTS代码：	8542.39.00.01
风险等级：	7.81
模拟集成电路 - 其他类型：	STEPPER MOTOR CONTROLLER
JESD-30 代码：	R-PDIP-T16
JESD-609代码：	e6
长度：	19 mm
功能数量：	1
端子数量：	16
封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP
封装形状：	RECTANGULAR
封装形式：	IN-LINE
认证状态：	Not Qualified
座面最大高度：	4.7 mm
最大供电电压 (Vsup)：	5.25 V
最小供电电压 (Vsup)：	4.75 V
标称供电电压 (Vsup)：	5 V
表面贴装：	NO
端子面层：	TIN BISMUTH
端子形式：	THROUGH-HOLE
端子节距：	2.54 mm
端子位置：	DUAL
宽度：	7.62 mm
Base Number Matches：	1

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