NJM3517D2 데이터 시트보기 (PDF) - Japan Radio Corporation

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NJM3517D2

STEPPER MOTOR CONTROLLER / DRIVER

Japan Radio Corporation  

NJM3517

s PURPOSE OF EXTERNAL COMPONENTS

For figures 3 and 4. Note that “Larger than …” is normally the vice versa of

“Smaller than … .”

Component Purpose

Value

Larger than value Smaller than value

D1, D2

Passes low power to

motor and prevents

high power from

shorting through low

power supply

If = 1A

1N4001, UF4001

Increases price

Decreases max

current capability

D3 … D6

Inductive current

supressor

If = 1A

Increases price

Decreases current

turn-off capability

trr = 100nS

e.g.

BYV27

UF4001

RGPP10G

RGPP30D

Slows down turn-

off time. Voltage

at anode might

exceed voltage

breakdown

Speeds up turn-

off time.

R1

R2, R3

R4 … R7

Base drive current

limitter

R = 20ohm

( ) P = R1

Vmm 2

R1 + R2

Base discharge resistor R = 240ohm

( ) P = R1

Vmm 2

R1 + R2

( ) External transistor base

driver

R

=

Vmm-

Vbe- Vce

Vbe

I4 - R12

P > (I4)2• R4

Check hfe.

Slows down Q1’s Speeds up Q1’s

turn-on and Q4’s turn-on and Q4’s

turn-off time.

turn-off time.

Slows down Q1’s Speeds up Q1’s

turn-off and Q4’s turn-off and Q4’s

turn-on time.

turn-on time.

Decreases ext. Increases ext.

transistor IC max. transistor IC max.

Lowers 3517

Increases 3517

power dissipation. power dissipation.

R8, R9

ØA, ØB pull-up

resistors

R = 5kohm @ pull-up

voltage = 5V.

(VCC)2

P=

R

Increases noise

sensitivity, worse

logic-level

definition

Increases noise

immunity, better

logic-level

definition.

Less stress on ØA, Stress on ØA, ØB

ØB output

output

transistors

transistors.

R10, R11

Limit max. motor

Vmm-VMotor-VCESat Decreases motor

current. Resistors may R =

be omitted. (Check

IMotor max

current.

Increases motor

current.

motor specifications

first.)

R12 … R15 External transistor base

discharge.

Vbe

R=

= 15 Ω

I12

P > Vbe• I12

Slows down

Speeds up

external transistor external transistor

turn-off time.

turn-off time.

Lowers 3517

Increases 3517

power dissipation power dissipation

RT, CT

C1, C2

C3 … C5

Q1, Q2

Q3, Q4

Q5 … Q8

Sets LA and LB on time R = 47kohm, C = 10nf

when triggered by

STEP.

P < 250mW

Increases on time. Decreases on time.

Stores the doubling

voltage.

C = 100µ F

VC ≥ 45V

Increases effective Decreases

on-time during

effective on-time

voltage doubling during voltage

doubling.

Filtering of supply-

C ≥ 10 µ F

voltage ripple and take-

up of energy feedback

from D3 … D6

Increases price,

better filtering,

decreases risk of

IC breakdown

Decreases price,

more compact

solution.

VRated>Vmm ,Vss or Vcc Increases price

Risk for capacitor

breakdown.

Activation transistor of IC as motor requires.

voltage doubling.

Increases price.

Decreases max Im

during voltage

doubling.

Charging of voltage

doubling capacitor

( ) IC=

(Vmm- Vf -VCE ) • C1

1

-

fStep

0.55

•

RT •

CT

Motor current drive

transistor.

IC as motor requires.

PNP power trans.

Increases max

Decreases max

current capability. current capability.

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