STV8172A 查看數據表（PDF） - STMicroelectronics

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STV8172A

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

STMicroelectronics 

Application Hints

STV8172A

CS performs an integration of the parabolic signal on CL, therefore the amount of S correction is set

by the combination of CL and Cs.

4.3 Application with Differential-output Drivers

Certain driver ICs provide the ramp signal in differential form, as two current sources i+ and i− with

opposite variations.

Figure 7: Using a Differential-output Driver

0 470µF 0 0 0 0 0 0 0 0 00.1µF

CF (47 to 100µF)

+Vs Output

Voltage

Differential output

driver IC

ip

+

icm

0R7 0 0 0 0

icm

-ip -

6

Power

Amplifier

7+

1-

3

2

Flyback

Generator

Output

Current

Ip

Thermal

Safety

5

1.5Ω Rd(*)

Yoke

Ly

4

-VEE

470µF00 00 00 00 00 00 00 00 00 00 0.1µF

R2

(*) recommended:

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

0000000000 R1

Let us set some definitions:

● icm is the common-mode current: icm = 12-- (i+ + i-)

● at peak of signal, i+ = icm + ip and i− = icm - ip, therefore the peak differential signal is ip - (-

ip) = 2 ip, and the peak-peak differential signal, 4ip.

The application is described in Figure 7 with DC yoke coupling. The calculations still rely on the fact

that V1 remains equal to V7.

8/14

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