TA7289P/F/FG
TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT
SILICON MONOLITHIC
TA7289P,TA7289F/FG
PWM STEPPING MOTOR DRIVER
The TA7289P, TA7289F/FG are PWM solenoid driver designed
especially for use high efficiency stepping motor control.
It consist of 1.5A peak current drive capable output full bridge
driver, oscillation circuit for PWM switching, 4bit D−A for output
current control and TTL compatible input circuit.
FEATURES
Wide Range of Operating Voltage
: V
CC (opr.)
Min. = 6~27 V
High Current Capability: I
O
Max = 1.5 A (PEAK)
LS−TTL Compatible Control Inputs (IN A, IN B)
Few External Components Required.
Build−in 4bit DAC.
TA7289F/FG
The TA7289FG is a Pb-free product.
The TA7289P is Sn plated product including Pb.
The following conditions apply to solderability:
*Solderability
1. Use of Sn-37Pb solder bath
*solder bath temperature = 230°C
*dipping time = 5 seconds
*number of times = once
*use of R-type flux
2. Use of Sn-3.0Ag-0.5Cu solder bath
*solder bath temperature = 245°C
*dipping time = 5 seconds
*the number of times = once
*use of R-type flux
Weight
HDIP14−P−500−2.54A : 3.00g (Typ.)
HSOP20−P−450−1.00 : 0.79g (Typ.)
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2006-3-2
TA7289P/F/FG
BLOCK DIAGRAM
TA7289P / TA7289F/FG
Note:
Pin (1), (4), (6), (8), (11), (13) of TA7289F/FG are all NC (Non−connection)
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2006-3-2
TA7289P/F/FG
PIN FUNCTION
PIN No.
P
1
2
3
4
5
6
7
8
9
10
11
12
13
14
FIN
F/FG
20
2
3
5
7
9
10
12
14
15
16
17
18
19
FIN
PIN
SYMBOL
V
ref
IN B
IN A
C
OSC
NF
OUT B
V
I
OUT A
GND
V
CC
2
2
2
2
0
1
2
3
FUNCTIONAL DESCRIPTION
NF voltage supply input terminal
Signal input terminal
Signal input terminal
Function
Internal oscillation frequency input terminal
Output current detection terminal
Output B terminal
Comparator input terminal
Output A terminal
GND terminal
Power voltage supply terminal
D / A input terminal
D / A input terminal
D / A input terminal
D / A input terminal
GND terminal
GND
Note:
Pin (1), (4), (6), (8), (11), (13) of TA7289F/FG are all NC (Non−connection)
FUNCTION
IN A
L
H
L
H
IN B
L
L
H
H
OUT A
OFF
H
L
OFF
OUT B
OFF
L
H
OFF
STOP
CW / CCW
CCW / CW
STOP
MODE
INPUT CIRCUIT
(IN A, IN B)
Input circuit is shown in Fig.1 IN A and IN B are TTL compatible “Low Active” type and have a hysteresis of 0.8
V Typ at T
j
= 25°C.
TA7289P / TA7289F/FG
Fig. 1
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2006-3-2
TA7289P/F/FG
D / A AND Vref CIRCUIT
TA7289P / TA7289F/FG
Fig. 2
I
DO
of current mode DAC output is proportional to multipled voltage of V
ref
(PIN (1) (or (20))) and DAC inputs.
DAC inputs are all “low active” type and required input current of 300 µA MIN for each input terminal.
OSC AND COMPARATOR
TA7289P / TA7289F/FG
Fig. 3
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2006-3-2
TA7289P/F/FG
Sawtooth OSC circuit consists of Q
1
through Q
4
and R
1
through R
3
.
R
1
and R
2
are voltage divider of 5 V build−in regulator.
Q
1
is turned “off” when V
4
is less than the voltage of 2.5 V + V
BE
Q
4
+ V
BE
Q
3
approximately equal to 3.8 V. V
4
is increased by C
1
charging of I
4
. Q
1
and Q
2
are turned “ON” when V
4
becomes V
4
−
H level.
Lower level of V
4
(V
4
−
L) is equal to V
BE
Q
4
+ V
BE
Q
3
+ V
SAT
Q
1
approximately equal to 1.5 V.
V
4
is calculated by following equation.
V
4
= 5·(1
−
e
−
1
·t) .................................................(1)
C
1
·R
3
Assuming that V
4
= 1.5 V (t = t
1
) and=3.8 V (t = t
2
).
C
1
is external capacitance connected to Pin (4) (or (5)) and R
3
is on−chip 20 kΩ resistor.
Therefore, OSC frequency is calculated as follows.
t
1
=
−C
1
·R
3
·1n (1
−
1.5
) ................................................(2)
5
3.8
) ................................................(3)
5
t
2
=
−C
1
·R
3
·1n (1
−
f
OSC
=
1
t
1
−
t
2
=
1
1.5
3.8
C
1
· ( R
3
·1n (1
−
)
−
R
3
·1n (1
−
))
5
5
=
1
(kHz) (Unit of C
1
is
µ
F)
21.4 C
1
ABSOLUTE MAXIMUM RATINGS
(Ta = 25°C)
CHARACTERISTIC
Supply Voltage
SYMBOL
V
CC
V
ref
V
IN
V
I
TA7289P
Output Current
TA7289F/FG
TA7289P
TA7289F/FG
Power Dissipation
Operating Temperature
Storage Temperature
TA7289P
TA7289F/FG
I
O (MAX.)
RATING
30
30
7
2
1.5
0.8
0.7
0.3
2.3
1.0
−30~85
−55~150
W
°C
°C
A
V
UNIT
Reference Voltage
I
O (AVE.)
PD (Note)
T
opr
T
stg
Note:
NO HEAT SINK
5
2006-3-2
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