TDA9535L 查看數據表（PDF） - STMicroelectronics

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TDA9535L

9.5 NS TRIPLE-CHANNEL HIGH VOLTAGE VIDEO AMPLIFIER WITH VERY LOW STD-BY POWER CONSUMPTION

STMicroelectronics 

TDA9535L

6.3 - Amplifier gain and cut-off adjustment

A very simplified schematic of each TDA9535L

channel is shown in Figure 3.

The feedback net of each channel is integrated

with a built-in voltage gain of 19.8 (40k/2k).

Figure 3. Simplified schematic of one channel

2k

IN

VREF

The output voltage VOUT is given by the following

formula:

VOUT = (VG+1) x VREF - (VG x VIN)

for VG = 19.8 and VREF = 5.7V, we have

VOUT = 118.6 - 19.8 x VIN

VDD

40k

-

+

OUT

GND

7 ARCING PROTECTION

As the amplifier outputs are connected to the CRT

cathodes, special attention must be given to pro-

tect them against possible arcing inside the CRT.

The arcing network that we recommend (see

Figure 4) provides efficient protection without de-

teriorating the amplifier video performances.

Protection must be considered when starting the

design of the video CRT board. It should always

be implemented before starting to adjust the dy-

namic video response of the system.

The total resistance value between the amplifier

and the CRT cathode (R10+R11) should not be

less than 300 Ω.

Spark gap diodes are strongly recommended for

protection against arcing.

Figure 4. Arcing protection network (one channel)

High Voltage (90-110V)

R19

33Ω

C12 (*)

100nF/250V

C24

4.7µF/150V

VDD

D12

FDH400

C18

100nF

TDA9535L

TDA9536 OUT

R10

150Ω/0.5W

L1

0.39µH

R11

150Ω/0.5W

F1

Spark gap

R29

GND

10Ω

(*): To be connected as close as possible to the device.

7/16

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