TA8126S PDF даташит
Спецификация TA8126S изготовлена «Toshiba Semiconductor» и имеет функцию, называемую «DC/DC CONVERTER FOR ELECTRIC TUNING». |
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Детали детали
Номер произв | TA8126S |
Описание | DC/DC CONVERTER FOR ELECTRIC TUNING |
Производители | Toshiba Semiconductor |
логотип |
11 Pages
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TA8126S / F
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA8126S,TA8126F
DC / DC Converter For Electric Tuning (3V USE)
The TA8126S,TA8126F are DC /DC converter ICs, which are
designed for biasing varactor diodes of tuner system. Those items
are especially suitable for supplying high voltage (about 15V /
30V) for electric tuning (FM / TV / UHF / AM) system of
headphone stereos, radio cassette recorders, or other equipments.
Features
· Excellent regulatory capability of output voltage against
fluctuation of supply voltage, and of ambient temperature.
· Excellent spurious radiation by oscillation of sine wave.
· Output voltage can be switched over to 15V or 30V
by one−make switch, and is applicable to 10V, too.
· Few external parts.
· Low supply current (at non−load,VCC = 3V, Ta = 25°C)
ICCQ1 = 2.4mA (typ., VO = 15V mode)
ICCQ2 = 3.0mA (typ., VO = 30V mode)
· Operating supply voltage range (Ta = 25°C)
VCC1 (opr) = 1.8~10V, (VO = 15V mode)
VCC2 (opr) = 2.0~10V, (VO = 30V mode)
Block Diagram
Weight
SIP9−P−2.54C: 0.72g (typ.)
SSOP10−P−225−1.00: 0.09g (typ.)
1 2002-10-30
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Block Diagram
TA8126S / F
Terminal Explanation
Terminal Voltage: Typical Terminal Voltage with Test Cirucuit (VCC = 3V, Ta = 25°C)
Pin No. S / F
Pin Name
1/ 6 NC
Contents
―
Equivalent
―
Terminal
Voltage
(V)
―
2/7
4/9
FB
OSC
・Hartley type oscillator
fOSC = 2p
1
L3 C2
・Controlling oscillation
current at the terminal
of FB
1.4
3.0
3/8
5 / 10
6/1
7/2
8/3
9/4
VCC
GND
DET
VO
―
―
・Boosted output
(voltage double rectifier)
VO = 15V / 30V
SW1
SW2
・Output voltage mode
Switchover
ON: VO = 15V
OFF: VO = 30V
― 3.0
―0
―
―
―
―
- / 5 NC
―
――
2 2002-10-30
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Application Note
1. These ICs have the output voltage by means of
boosting the oscillation voltage, derived from
hartley type oscillator circuit and of voltage-double
rectifier with C3, D1, and D2.
(1) Designing of oscillation frequency
fOSC≒ 2F
1
L3 C2
(2) Coil turns can be designed as following:
VOSC (p-p) = 2 (VCC (min) -VCE1 (sat))
n = n3 ≒
VO
n2 VOSC (p-p)
TA8126S / F
(Note) VCC (min) : Minimum of supply voltage designed by a equipment
VCE1 (sat): Saturation voltage of Q1
n : Coil turns ratio (L2, L3)
VO : Output voltage (VO≒30V)
The turn of L1 is designed, so as to make the terminal of FB be about 200~300mVp-p through C1. The turn of
L1 should be small, and the capacitance of C1 and Q0 of coil should be large, for the oscillation start at turnig
power-on.
(3) Allowance is advisable for coil design of n, Q0. However, spurious radiation can be reduced, in case that the
output current and n of coil don't make large.
2. In case that spurious radiation due to the oscillation is large, it is
recommended to provide LC filter on the power supply line as shown in Fig.2.
As for this value, select the optimum one depending on the kind of set.
3 2002-10-30
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Номер в каталоге | Описание | Производители |
TA8126 | DC/DC CONVERTER FOR ELECTRIC TUNING (3V USE) | Toshiba Semiconductor |
TA8126F | DC/DC CONVERTER FOR ELECTRIC TUNING | Toshiba Semiconductor |
TA8126S | DC/DC CONVERTER FOR ELECTRIC TUNING | Toshiba Semiconductor |
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