STV8172A 데이터 시트보기 (PDF) - STMicroelectronics

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STV8172A

Vertical deflection booster for 3 App TV/monitor applications with 70 V flyback generator

STMicroelectronics 

STV8172A

Application Hints

4.2 AC-Coupled Applications

In AC-coupled applications (See Figure 6), only one supply (VS) is needed. The vertical position of

the scanning cannot be adjusted with input bias (for that purpose, usually some current is injected

or sunk with a resistor in the low side of the yoke).

Figure 6: AC-coupled Application

0 470µF 0 0 0 0 0 0 0 0 00.1µF

CF (47 to 100µF)

+Vs Output

Voltage

6

3

2

Flyback

Power

Amplifier

Generator

Output

Current

Ip

7+

00000

5

VM

R3

1-

Thermal

Safety

1.5Ω Rd(*)

Yoke

Ly

Vm

0 040 0 0

00000

0 0 0 0 R5

Cs R4

CL

(*) recommended:

5----0L----µy---s-- < Rd < 2----0L----µy---s--

R2

R1

00000

4.2.1

Application Hints

Gain is defined as in the previous case:

Ip = V-----M------2–-----V----m--- × R-----1---R--×--2---R----3--

Choose R1 then either R2 or R3. For good output centering, V7 must fulfill the following equation:

-R-V----2----S4-------+-–----RV----7-5- = V-----7-----–----V----R------M----3--------+2----------V--------m-------- + R-V----72--

or

V7

×

⎛

⎝

R---1--3--

+ R---1--2-- + -R----4-----+1-----R-----5- ⎠⎞ =

⎛

⎜

⎝

-2---(---R----4-V----+S-----R-----5----)

+

-V---2-M----×--+---R--V--3---m---⎠⎟⎞

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