BA6438 데이터 시트보기 (PDF) - ROHM Semiconductor

부품명

상세내역

일치하는 목록

BA6438

3-phase motor driver

ROHM Semiconductor 

Motor driver ICs

!Application example

Motor direction

control signal

Motor

direction

detection

11 ED / S

Motor direction

setting

VCC 19

Signal power

supply

24 VM

H1+ Hall amp

Hall 10

9

H1−

H2+

Hall 8

7

H2−

H3+

Hall 6

5

H3−

4

PCH

AGC

TSD

23 A1

3 A2

1 A3

ATC

2

0.5Ω

0.033

VCC

µF EC

17

Short-circuit Switching

detection regulator

REG

13

14

VS

16

ECR

Ripple

cancellation

Output

saturation

prevention

12 GND

TL CS PCV PCI

20 22

18 21

Oscil- Output

lator saturation

detector

15 OSC

0.1µF

VCC

Torque control

signal

0.033

µF

0.1µF

470PF

Fig. 8

BA6438S

Motor power supply

!Operation notes

The BA6438S has two thermal shutdown circuits (TSD1

and TSD2) to protect the IC. The typical shutdown tem-

peratures are 175°C for TSD1 and 215°C for TSD 2.

When the TSD1 is activated at an elevated chip tempera-

ture, the output pins (pins 1, 3, and 23) are set to the open

state. TSD1 is functional against excessive power dis-

sipation, output short-circuiting, and other irregularities in

the output current, but does not work against overheating

caused by high internal currents due to externally caused

IC damage or pin-to-pin short-circuiting.

When TSD2 is activated at a higher chip temperature, the

high-and low-side output transistors are turned on, and

the internal resistance between the motor power supply

pin (pin 24) and the output ground pin (pin 2) drops to less

than 3Ω. The motor power supply current (IM) is then giv-

en by

IM=

VM[V]

RM+R2P+3[Ω]

where

IM is the motor supply current,

VM is the motor supply voltage,

RM is the motor power supply output resistance,

R2P is the pin-2 resistance.

In your application, make sure to connect between the

motor power supply and pin 24 a circuit breaker that

operates at currents less than IM .

Share Link: