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TA7289P Fiches technique(PDF) 5 Page - Toshiba Semiconductor

No de pièce TA7289P
Description  PWM STEPPING MOTOR DRIVER
Download  19 Pages
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Fabricant  TOSHIBA [Toshiba Semiconductor]
Site Internet  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

TA7289P Fiches technique(HTML) 5 Page - Toshiba Semiconductor

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TA7289P/F/FG
2006-3-2
5
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.
Lower level of V4 (V4 − L) is equal to VBE Q4 + VBE Q3 + VSAT Q1 approximately equal to 1.5 V.
V4 is calculated by following equation.
V4 = 5·(1 − e −
3
1·R
C
1
·t) .................................................(1)
Assuming that V4 = 1.5 V (t = t1) and=3.8 V (t = t2).
C1 is external capacitance connected to Pin (4) (or (5)) and R3 is on−chip 20 kΩ resistor.
Therefore, OSC frequency is calculated as follows.
t1 = −C1·R3·1n (1 −
5
1.5
) ................................................(2)
t2 = −C1·R3·1n (1 −
5
3.8
)................................................(3)
fOSC =
2
1 t
t
1
))
5
3.8
(1
·1n
R
)
5
1.5
(1
·1n
R
(
·
C
1
3
3
1
=
=
F)
is
C
of
(Unit
(kHz)
C
21.4
1
1
1
µ
ABSOLUTE MAXIMUM RATINGS (Ta = 25°C)
CHARACTERISTIC
SYMBOL
RATING
UNIT
VCC
30
Supply Voltage
Vref
30
VIN
7
Reference Voltage
VI
2
V
TA7289P
1.5
TA7289F/FG
IO (MAX.)
0.8
TA7289P
0.7
Output Current
TA7289F/FG
IO (AVE.)
0.3
A
TA7289P
2.3
Power Dissipation
TA7289F/FG
PD (Note)
1.0
W
Operating Temperature
Topr
−30~85
°C
Storage Temperature
Tstg
−55~150
°C
Note:
NO HEAT SINK


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