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TAS2020 Datasheet(PDF) 23 Page - Texas Instruments

Part # TAS2020
Description  TAS2020 3.2W Mono Digital Input Class-D Speaker Amp with 5.5V PVDD Support
PDF  79 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

TAS2020 Datasheet(HTML) 23 Page - Texas Instruments

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LIMITER ATTACK/
RELEASE
Signal Level < Limiter threshold
BOP ATTACK/
RELEASE
LIM_MAX_ATN
ATTNUATION
APPLIED
BOP
ATTN
+
BOP ACTIVE PHASE (BOP_GAIN
0dB)
PAUSE LIMITER UPDATES
Supply Voltage < BOP threshold
Figure 6-2. Limiter and Brown out gain attenuation
6.4.2.4.1 Voltage Limiter and Clipping protection
The limiter can be configured to reduce the output signal based on fixed signal threshold level, or it can
attenuate signal based on a dynamic threshold which tracks the selected supply voltage. The register bit
SUPPLY_HEADROOM_LIM_MODE enables the dynamic supply tracking and can be used to limit the clipping
distortion when the supply voltage is varying in the system.
Table 6-19. Limiter dynamic supply headroom
tracking mode
SUPPLY_HEADROOM_LIM_MO
DE
Configuration
0(default)
Disabled
1
Enabled. Limiter threshold is
dynamically changed based as
a fixed percentage of monitored
supply voltage.
When SUPPLY_HEADROOM_LIM_MODE is set high, the limiter sets the threshold as a fixed percentage
of the monitored supply voltage. The limiter begins reducing gain when the output signal level is greater
than the threshold configured. For eg, if voltage limiting is desired to be 10% below the supply voltage, then
LIM_SLOPE[23:0] is configured as 0.9 and the threshold is calculated as monitored supply voltage multiplied by
1.1. Similarly if the LIM_SLOPE[23:0] is configured at > 1.0, the limiter threshold is set at higher than the supply
voltage, and a small amount of controlled clipping occurs.
VSUP (V)
BOP_TH
Brown
Out
LIM_SLOPE = 1.0
Lim. Th. = Supply Voltage
LIM_SLOPE = 0.x
Lim. Th. = Supply Voltage*LIM_SLOPE
LIM_SLOPE = 1.x
Lim. Th. = Supply Voltage*LIM_SLOPE
Figure 6-3. Limiter with dynamic supply headroom
www.ti.com
TAS2020
SLASFD4A – AUGUST 2024 – REVISED JULY 2026
Copyright © 2026 Texas Instruments Incorporated
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