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| 型號(hào)： | TA8126S |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PSIP9 |
| 封裝： | SIP-9 |
| 文件頁數(shù)： | 5/11頁 |
| 文件大小： | 752K |
| 代理商： | TA8126S |
TA8126S / F
2002-10-30
3
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≒
2
C
3
L
2
1
F
(2) Coil turns can be designed as following:
VOSC (p-p) = 2 (VCC (min) -VCE1 (sat))
n =
2
n
3
n
≒
p)
(p
OSC
V
O
V
-
(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.
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