AN8480NSB データシートの表示（PDF） - Panasonic Corporation

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AN8480NSB

3-phase full-wave motor driver IC

Panasonic Corporation 

AN8480NSB

I Application Notes (continued)

• Theory of thermal resistance

A chip temperature or the fin temperature can be understood in the same way as Ohm's Law.

Tj

Rj-c

Rf

Rc-a

Ta

Tj : Chip temperature

Ta : Ambient temperature

P P : Electric power generated by IC

Rj-c : Thermal resistance between a chip and a package

Rc-a: Thermal resistance between a package and a surface of a heat sink or free air

Rf : Thermal resistance between a package and surface of a heat sink

Tj = Ta + P × (Rj-c + Rc-a // Rf)

Make sure that Tj does not exceed 150°C.

If it exceeds 150°C, you can suppress the rise of a chip temperature by adding a heat sink which is equivalent to

Rf in the above figure.

Tj = Ta + P × (Rj-c + Rc-a // Rf)

A package surface and the fin are available for a temperature measurement. But the fin part is recommendable for

measurement because a package surface measurement does not always promise you a consistent measuring result.

I Application Circuit Example

H1+ 2

H1− 3

H2+ 5 Hall

amp.

H2− 6 matrix

Direction

changeover

H3+ 8

H3− 9

VH 7

Detection

Hall

bias

Direction

detection

ER

Logic

EP = ER × EA

Upper side

distribution Amp.

Lower side Amp.

distribution

Servo

torque

EC 18

command

ECR

17

EA

Absolute

value

Start/stop

VTL

Thermal

protection

circuit

Brake

circuit

VM = 12 V

21 VM

22 CS1

RCS = 0.5 Ω

28 A1

27 A2

26 A3

1 PG

FG 12 FG

comparator

FG signal

High: Start

Medium: FG is on.

Low: Stop

VCC = 5 V

0.1 µF

Low: TSD on

Low: Short brake High: TSD off

High: Reverce rotation brake

6

SDD00006BEB

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