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BA6438 Scheda tecnica(PDF) 6 Page - Rohm

Il numero della parte BA6438
Spiegazioni elettronici  3-phase motor driver
Download  8 Pages
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Produttore elettronici  ROHM [Rohm]
Homepage  http://www.rohm.com
Logo ROHM - Rohm

BA6438 Scheda tecnica(HTML) 6 Page - Rohm

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BA6438S
Motor driver ICs
!Application example
10
9
8
7
6
5
4
2
1
3
23
24
19
11
H1+
Hall
Hall
Hall
0.033
µF
Torque control
signal
0.033
µF
0.1
µF
0.1
µF
ATC
Motor direction
control signal
VCC
EC
ECR
AGC
Short-circuit
detection
TSD
Signal power
supply
VCC
VM
A1
A2
REG
Motor power supply
20
22
18
21
470PF
Switching
regulator
Oscil-
lator
Output
saturation
detector
OSC
VS
14
13
15
12
16
17
GND
TL
CS
PCI
Motor
direction
detection
PCV
Ripple
cancellation
H3
H3+
H2
H2+
H1
Hall amp
VCC
Output
saturation
prevention
Motor direction
setting
A3
ED / S
PCH
0.5
Fig. 8
!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 3
Ω. 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 .


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