ta7291af TOSHIBA Semiconductor CORPORATION, ta7291af Datasheet - Page 9

• Manufacturer Part Number: ta7291af
• Description: Full-bridge Driver For Dc Motors Driver For Controlling The Forward And Reverse Rotations
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Notes
Protection Features
·
·
·
Overcurrent Protection Circuit
Thermal Shutdown Circuit
Output high voltage
· V
The overcurrent protection circuit detects a current flowing through the upper power transistor. If the
current exceeds a predetermined value (about 2.5 A), the circuit turns all the power transistors off.
However, it does not always prevent overcurrent. If an output pin is shorted or grounded, the IC might be
destroyed before operation of the overcurrent protection circuit. So, be sure to connect a resistor or fuse to
the power supply (V
If the chip temperature exceeds a predetermined limit (about 170°C), the thermal shutdown circuit turns
all the power transistors off.
At power on, V
simultaneously or after V
A logic high on the V
circuit as shown in the figure.
When a voltage greater than or equal to V
is applied to the pin, the circuit is active. When a
voltage less than or equal to V
the pin or the pin is grounded, the circuit is
inactive.
When the pin is high, the input current I
into the input circuit. So, be careful about the
output impedance of the first stage.
The input hysteresis is 0.7 V (typ.). At power on
(V
· Operation based on the V
Power On/Off
Input Circuit
Output Circuit
CC
The V
of V
the voltage is applied to the base A of Q2 (power
transistor 2). As a result, the voltage which is
reduced by the value of V
V
V
The V
In this case, connect it via a protection resistor
(3 kW or more) to the V
might cause oscillation.
V
OUT
OUT
ref
ref
), set both input pins IN1 and IN2 to low.
BE
pin
must be £ V
pin.
ref
ref
(small signal) in the V
= V
voltage is increased by twice the value
pin must not be left open when unused.
ref
CC
+ 2V
must be applied simultaneously or before V
S
.
S
BE
IN
) line. (See “Application Circuit.”)
ÙV
pin activates the input
S
S
BE (
.
pin. Otherwise, it
BE
ref
IN
(Q2) appears on the
Q
voltage
ref
2) ~ -
(low) is applied to
circuit. Then,
V
ref
IN
+ 0.7 V
IN
flows
(high)
9
V
IN
TA7291AP/TA7291AS (J)/TA7291AF
6/1/9
or
S
. At power off, V
V
TA7291AP/TA7291AS (J)/TA7291AF
IN
5/9/7
circuit
V
1 kW
ref
Q
1
A
TA7291AP/AS(J)/AF
1/5/1
CC
5 kW
Q
2
must be removed
V
CC
standby
1/5/1
8/6/15
2/7/4
4/8/5
2003-02-14
or
10/3/13
V
V
ref
OUT