STA533WF STMicroelectronics, STA533WF Datasheet - Page 9

• Manufacturer Part Number: STA533WF
• Description: AMP, AUDIO, POWER, QUAD, POWERSO36
• Manufacturer: STMicroelectronics

Specifications of STA533WF

• No. Of Channels: 4
• Output Power: 40W
• Supply Voltage Range: 5V To 18V
• Load Impedance: 8ohm
• Operating Temperature Range: 0°C To +70°C
• Amplifier Case Style: PowerSSO
• No. Of Pins: 36
• Svhc: No SVHC
• Rohs Compliant: Yes

STA533WF
Supply decoupling capacitors
To meet the performance figures given in this datasheet the STA533WF power supply must
be adequately filtered.
For this purpose capacitors connected from pins VCC1 to GND1 and from VCC2 to GND2
must be placed as close as possible to the related IC pins.
For reliability and optimum performance the following capacitors are suggested:
Pin GNDREG is used to filter the internal reference voltage V
connected to other ground pins, it is an internally generated supply.
Pin VCCSIG is used to filter the internal reference voltage V
connected to other supply pins, it is an internally generated supply.
Output filter
A passive 2nd-order filter is used on the STA533WF power outputs to reconstruct an analog
audio signal. The system performance can be significantly affected by the output filter
design and choice of passive components.
Filter designs for 4-Ω and 8-Ω loads are shown in the applications circuits below.
Applications circuits
Figure 6
speakers with 10% THD when V
Figure 7
at 10% THD when V
STA308+STA533WF+STA50X demo board.
For both applications circuits a PWM modulator is required as driver.
100-nF ceramic capacitor with lead length less than 2 mm, connected to the ground
plane and as close as possible to the GND pin
1-uF X7R (low ESR) capacitors.
below shows a typical full-bridge circuit for supplying 20 W + 20 W into 8-Ω
below shows a single-BTL configuration capable of supplying 40 W into a 4-Ω load
CC
= 19 V. This result was obtained with peak power for <1 s using the
Doc ID 17658 Rev 1
CC
= 18 V.
SS
DD
; This pin must not be
; This pin must not be
Applications information
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