TA7712P/PG/F/FG
TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT
SILICON MONOLITHIC
TA7712P/PG,TA7712F/FG
3 PHASE BI−DIRECTIONAL FOR MOTOR CONTROL IC
FEATURES
FG is not required.
(System for obtaining rotation signal through position
sensing)
Start / stop, CW / CCW and brake functions are provided.
Gain of position sensing circuit is high, and hysteresis is
provided.
Rotation signal output is provided. (Frequency signal of three
times the position sensing output (hall sensor output) can be
obtained.)
External transistor type.
TA7712F/FG
TA7712P/PG
The TA7712PG/FG:
The TA7712PG/FG is a Pb-free product.
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
DIP20−P−300−2.54A : 2.25 g (Typ.)
SSOP24−P−300−1.00 : 0.32 g (Typ.)
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TA7712P/PG/F/FG
BLOCK DIAGRAM
TA7712P/PG / TA7712F/FG
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2006-3-2
TA7712P/PG/F/FG
PIN FUNCTION
PIN No.
P/PG
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
F/FG
1
2
3
5
6
7
8
10
11
12
13
14
―
17
18
19
20
22
23
24
SYMBOL
La
La
Lb
Lb
Lc
Lc
+
−
+
−
FUNCTION DESCRIPTION
a−phase upper drive output terminal
a−phase lower drive output terminal
b−phase upper drive output terminal
b−phase lower drive output terminal
c−phase upper drive output terminal
c−phase lower drive output terminal
GND terminal
START / STOP switch terminal
Forward rotation / Reverse rotation switch terminal
Break terminal
FG signal output terminal
C, R connection terminal
Non connection
c−phase Hall Amp. negative
c−phase Hall Amp. positive input terminal
b−phase Hall Amp. negative input terminal
b−phase Hall Amp. positive input terminal
a−phase Hall Amp. negative input terminal
a−phase Hall Amp. positive input terminal
Power supply input terminal
+
−
GND
START / STOP
CW / CCW
BRAKE
FG
OUT
T
FG
N. C.
Hc
Hc
−
+
−
+
Hb
Hb
Ha
Ha
−
+
V
CC
F/FG:
(4), (9), (15), (16), (21) pin: non connection
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TA7712P/PG/F/FG
TIMING CHART
Forward rotation (
Position sensing signal advances Ha
→
Hb
→
Hc
.)
Reverse rotation (
Position sensing signal advances Ha
→
Hc
→
Hb.
)
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TA7712P/PG/F/FG
APPLICATION OF TA7712P/PG, TA7712F/FG
Like a video disk player, TA7712P/PG, TA7712F/FG is provided with the stopping function which in a short time,
stops the motor having a large inertia, and makes the quick disk−change possible.
To make the frequency generator (FG) unnecessary which was formerly required for fetching the rotation signal,
the signal from the position sensing input is ORed and is output to FG output pin (pin (11) / (13)).
Therefore, for FG output, three position sensing outputs (Ha, Hb, Hc) are ORed, and the rotation speed signal of
the frequency of six times that of one output can be fetched resulting in making it possible to obtain a sufficient
controlling characteristic with the F / V (Frequency−Voltage) conversion method of mono−stable type. The
difference from TA7713P/PG is that the stop function is automated in TA7713P/PG, however, it is operated by the
external signal in TA7712P/PG.
Description is made on the application of TA7713P/PG in the following.
(1) Operation of FG output (pin (11) / (13)) and TFG (pin (12) / (14))
In Fig.1, Q1 and Q2 are the monostable multi−vibrator to which gate (Q2 base) the signal from each position
sensing input of Ha, Hb and Hc is input after ORed and shaped in waveform by FF.
The pulse width of MMV made by Q1 and Q2 is determined by R
2
and C
2
to be connected to T
FG
(pin (12) /
(14)), and the square wave having the pulse width to be determined by C
2
and R
2
is output.
Of course, this frequency is proportional to the rotation signal and this frequency is six times the frequency of
each position sensing. (6 per 1 electrical rotation)
F / V conversion operation is made through connecting FG
0
output to LPF for integration. However, if R
2
is
made variable, the conversion gain can be controlled.
Fig. 1
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2006-3-2
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