BA6871 Rohm, BA6871 Datasheet - Page 10

• Manufacturer Part Number: BA6871
• Description: 3-phase motor driver
• Manufacturer: Rohm

FOperation notes
The BA6871BS has two thermal shutdown circuits
(TSD1 and TSD2) to protect the IC. The typical shutdown
temperatures 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 30) 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
FElectrical characteristic curves
682
Motor driver ICs
pin (pin 2) and the output ground pin (31 pin) drops to less
than 3 . The motor power supply current (I
en by
where
I
V
R
R
In your application, make sure to connect between the
motor power supply and pin 2 a circuit breaker that oper-
ates at currents less than I
M
M
M
31P
is the motor supply current
I
M
is the motor supply voltage,
is the motor power supply output resistance,
is the pin-31 resistance.
=
R
M
)R
V
M
31P
[V]
)3 [ ]
M
.
BA6871BS
M
) is then giv-