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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
z Wide Range of Operating Voltage : VCC (opr.) Min. = 6~27 V
z High Current Capability: IO Max = 1.5 A (PEAK) z LS−TTL Compatible Control Inputs (IN A, IN B) z Few External Components Required. z 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.)
1 2006-3-2
BLOCK DIAGRAM
TA7289P/F/FG
TA7289P / TA7289F/FG
Note: Pin (1), (4), (6), (8), (11), (13) of TA7289F/FG are all NC (Non−connection)
2 2006-3-2
PIN FUNCTION
PIN No. P F/FG 1 20 22 33 45 57 69 7 10 8 12 9 14 10 15 11 16 12 17 13 18 14 19 FIN FIN
PIN SYMBOL
Vref IN B
IN A
COSC NF
OUT B
VI OUT A
GND
VCC 20 21 22 23
GND
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
Note: Pin (1), (4), (6), (8), (11), (13) of TA7289F/FG are all NC (Non−connection)
FUNCTION
IN A
IN B
OUT A
OUT B
MODE
L
L
OFF
OFF
STOP
H L H L CW / CCW
L H L H CCW / CW
H
H
OFF
OFF
STOP
TA7289P/F/FG
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 Tj = 25°C.
TA7289P / TA7289F/FG
Fig. 1 3
2006-3-2
D / A AND Vref CIRCUIT
TA7289P/F/FG
TA7289P / TA7289F/FG
Fig. 2
IDO of current mode DAC output is proportional to multipled voltage of Vref (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
4
2006-3-2
TA7289P/F/FG
Sawtooth OSC circuit consists of Q1 through Q4 and R1 through R3. R1 and R2 are voltage divider of 5 V build−in regulator. Q1 is turned “off” when V4 is less than the voltage of 2.5 V + VBE Q4 + VBE Q3 approximately equal to 3.8 V. V4 is increased by C1 charging of I4. Q1 and Q2 are turned “ON” when V4 becomes V4 − H level. L.