TEA5101B 데이터 시트보기 (PDF) - STMicroelectronics

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TEA5101B

RGB HIGH VOLTAGE VIDEO AMPLIFIER

STMicroelectronics 

TEA5101B

APPLICATION INFORMATION

PC BOARD LAYOUT

The best performances of the high voltage video

amplifier will be obtained only with a carefully desi-

gned PC board. Output to input capacitances are

of particular importance.

For a single amplifier, the input-output capaci-

tance, in parallel with the relatively high feedback

resis-tance, creates a pole in the closed-loop trans-

fer function. A low parasitic capacitance (0.3pF)

feedbackresistor and HF isolated printed wires are

necessary. Further more, capacitive coupling from

the output of an amplifier toward the input of an-

other one may induce excessive crosstalk.

POWER DISSIPATION

The power dissipation consists of a static part and

a dynamic part. The static dissipation varies with

the output voltage. With VDD = 200V, Pstat = 2.6W

typ(3.5W max) at VOUT = 100V, 1.5W typ at 150V

and 3W typ at 50V (with R feedback = 39kΩ).

VOUT first value (100V) will be the reference.

The dynamic dissipation depends on the signal

spectrum and the load capacitance.

- Dynamic power with a typical picture with 150 Vpp

modulation is typically 1W.

- For a sine wave, dynamic dissipation peramplifier

is Pd = F x Cl x Vopp x Vdd x 0.8.

The load capacitance CL includes CRT and board

capacitance (10pF), and amplifier output capaci-

tance (8pF) : total CL value is about 20pF. For a

5MHZ, 50 Vpp sine wave and a 20pF load capaci-

tance, the maximum dynamic power is 2.5W.

- Generally, the maximum dynamic power is

reached with a white noise (tuner noise).

- Typical value is about 2W.

Total dissipation is typically 3.6W (2.6W + 1W).

With a maximum static dissipation of 3.5W, total

dissipation is :

- 4.5W with a typical picture (UER pattern)

- 5.5W with white noise

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