TDA9533 STMicroelectronics, TDA9533 Datasheet - Page 8

• Manufacturer Part Number: TDA9533
• Manufacturer: STMicroelectronics

Specifications of TDA9533

• Single Supply Voltage (typ): Not RequiredV
• Single Supply Voltage (min): Not RequiredV
• Single Supply Voltage (max): Not RequiredV
• Mounting: Through Hole
• Lead Free Status / RoHS Status: Supplier Unconfirmed

TDA9533
6.3 - Amplifier gain and cut-off adjustment
A very simplified schematic of each TDA9533
channel is shown in Figure 3.
The feedback net of each channel is integrated
with a built-in voltage gain of 19.3 (40k/2k).
The cut-off level of each channel is controlled by
the cut-off input. Vref is adjustable from 1 to 6V ac-
cording to the formula:
Figure 3. Simplified Schematic of one channell
8/16
Vref
Cut-off
=
IN
10 V
---- --------------- --------------- -- -
–
1.5
Cut
–
off
2k
Vref
The total gain of the amplifier related to V
14. Consequently we have:
V
Caution: If not used, the cut-off inputs have to be
set to DC voltage. The value of this DC voltage is
chosen to reach the optimum value of cut-off out-
put (see Figure 7).
40k
OUT
= 140 - (14 x V
GND
V
DD
Cut-off
) - (19.3 x V
OUT
IN
)
Cut-off
is