LB1987 データシートの表示（PDF） - SANYO -> Panasonic

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LB1987

Three-Phase Brushless Motor Driver for VCR Capstan Motors

SANYO -> Panasonic 

LB1987, 1987D, 1987M, 1987H

Control and Current Limiting Functions

Control characteristics

CVVCLTLITLMILRM=REE=5FF:V5:oVOpePnEN

Current limiting characteristics

VCVCCTCTTLLLTRRL=EEF=5F:V5:oOVpePnEN

GGmm11==00.6.655AA/V/Vtytypp

GGmm22==11..5500AA/V/Vttyypp

Slope = 0.50 A/V typ

0

1

2

3

4

5

VCTL

22..3355 VVttyypp 33..1155VVttyp

0

1

2

3

4

5

220000 mmVVttyypp

VLIM

Pin Functions

Pin

Function

UIN+

UIN–

U phase Hall element input.

Logic H refers to the state where IN+ > IN–

VIN+

VIN–

V phase Hall element input.

Logic H refers to the state where IN+ > IN–

Equivalent circuit diagram

(+) inputs

200 Ω

(–) inputs

100 µA

200 Ω

WIN+

WIN–

W phase Hall element input.

Logic H refers to the state where IN+ > IN–

A12207

UOUT

VOUT

WOUT

U phase output.

V phase output.

W phase output.

(These pins include internal spark killer diodes.)

VS

Output block power supply.

Rf(POWER)

Rf(SENSE)

Output current detection.

Current feedback is applied to the control block by inserting the resistor Rf

between these pins and ground. Also, both the lower side saturation

prevention circuit and the torque ripple correction circuit operate according to

the voltage on this pin. In particular, since this voltage sets the

oversaturation prevention level, the lower side oversaturation prevention

operation can be degraded if the value of this resistor is set too low.

Note that the PWR pin and the SENSE pin must be connected together.

Rf(POWER)

Vs

OUT for

each phase

200 Ω

VCC

150 µA

Lower side oversaturation

prevention circuit input

block

VCC

10 µA

200 kΩ

Rf(SENSE)

A12208

Speed control.

CTL

This circuit implements constant current drive based on current feedback

from the Rf pin.

Gm = 0.58 A/V typ at Rf = 0.5 Ω

CTL

Current limiter function control.

LIM

The output current can be modified linearly by the voltage on this pin.

Slope = 0.5 A/V typ at Rf = 0.5 Ω

200 Ω

CTLREF

(LB1987/D)

VCC

100 µA

VCC

VCC

200 Ω

CTLREF

200 µA

max

LIM

200 Ω

A12209

Continued on next page.

No. 6109-4/17

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