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參數(shù)資料
型號(hào): 935224770557
廠商: NXP SEMICONDUCTORS
元件分類: 消費(fèi)家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝: PLASTIC, SOT-319, QFP-64
文件頁數(shù): 46/75頁
文件大小: 522K
代理商: 935224770557
1997 Jul 01
50
Philips Semiconductors
Preliminary specication
I2C-bus controlled economy PAL/NTSC
and NTSC TV-processors
TDA837x family
East-West output stage
In order to obtain correct tracking of the vertical and horizontal EHT correction, the E-W output stage should be
dimensioned as illustrated in Fig.19.
Resistor Rew determines the gain of the E-W output stage. Resistor Rc determines the reference current for both the
vertical sawtooth generator and the geometry processor. The preferred value of Rc is 39 k which results in a reference
current of 100
A (Vref = 3.9 V).
The value of Rew must be:
Example: With Vref = 3.9 V; Rc =39k and Vscan = 120 V then Rew ≈ 68 k.
Control ranges of geometry control parameters
Typical case curves; Rc =39k, CSAW = 100 nF.
Figures 20 to 23 are valid for all types. Figures 24 to 27 are valid for TDA8375 and TDA8377.
R
ew
R
c
V
scan
18
V
ref
×
-----------------------
×
=
Fig.19 East-West output stage.
handbook, full pagewidth
TDA8375
TDA8377
52
51
45
DIODE
MODULATOR
MGK300
100 nF
(5%)
Csaw
39 k
(2%)
Rc
Rew
Vref
VEW
Vsupply
E-W
OUTPUT
STAGE
HORIZONTAL
DEFLECTION
STAGE
E-W drive
Vscan
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