TDA9511 datasheet(4/5 Pages) STMICROELECTRONICS

4 / 5 page

LOAD

OUT

Figure 2 : Typical Evaluation Schematic

TYPICAL APPLICATION

The TDA9511 consists of :

- A differential amplifier with active load,

- A DMOS output buffer,

- Abandgapvoltage reference(Pin 3 for filtering only).

PC board lay-out

The best performances are obtained with a care-

fully designed HF PC-Board, especially for the

output and input capacitors.

The feedback resistor RF must have a low parasitic

capacitor (CF < 0.3pF).

This parasitic capacitor CF must be compensated

by a capacitor R3 (roughly 20

⋅ CF) connected in

parallel with the input resistor R1.

The full bandwidth of the device is only obtained

with well matched compensation otherwise the

application will have either an integrator response

with a low bandwidth or a differentiator response

with too much ringing.

A diode DP (see Figure 2) has to be connected for

flashover protection.

Power dissipation

The power dissipation consists of a static part and

a dynamic part. The static dissipation varies with

the output voltage and the feedback resistor. The

dynamic power dissipation increases with the pixel

frequency.

For a signal frequency of 40MHz and 40VPP output

signal, the typical power dissipation is about 3.0W,

for VDD = 110V.

In first approximation, the dynamic dissipation is :

PD =VDD *CLOAD *

∆VOUT *f

and the total dissipation is :

P= VDD *CLOAD *

∆VOUT *f + VDD *IDD

+VCC *ICC -(VDD -VOUT

_____

)

VOUT

_____

RFEEDBACK

with f = pixel frequency

P = 110V x 10pF x 40V x 40MHz + 110V x 7mA

+12 x 20mA - 60

2V/20k

Ω = 2.95W

Recommended values :

R1 = 1k

Ω, R2 = 1.8kΩ,RF = 20kΩ,RP = 200Ω,

C4 > 10nF, C3 = 10 to 12pF for CF # 0.5pF.

R3 # 150

Ω.

TDA9511

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