TAS2120 datasheet(30/63 Pages) TI

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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 6-5. Limiter with dynamic supply headroom

When SUPPLY_HEADROOM_LIM_MODE is set low, the limiter begins reducing gain when the output signal

level is greater than the limiter threshold. The limiter can be configured to track selected supply below a

programmable inflection point with a minimum threshold value. Figure 6-6below shows the limiter configured to

limit to a constant level regardless of the selected supply level. To achieve this behavior, set the limiter maximum

threshold to the desired level using LIM_TH_MAX[23:0]. Set the limiter inflection point using LIM_INF_PT[23:0]

below the minimum allowable supply setting. The limiter minimum threshold register LIM_TH_MIN[23:0] does not

impact limiter behavior in this use case.

VSUP (V)

BOP_TH

Brown

Out

LIM_TH_MAX

Figure 6-6. Limiter with Fixed Threshold

Figure 6-7 shows how to configure the limiter to track selected supply below a threshold without a minimum

threshold. Set the LIM_TH_MAX[23:0] register to the desired threshold and LIM_INF_PT[23:0] register to

the desired inflection point where the limiter begins to reduce the threshold with the selected supply. The

LIM_SLOPE[23:0] register bits can be used to change the slope of the limiter tracking the supply voltage in V/V.

For example, a slope value of 1 V/V reduces the limiter threshold 1 V for every 1 V of drop in the supply voltage.

Program the LIM_TH_MIN[23:0] below the minimum of the selected supply to prevent the limiter from having a

minimum threshold reduction when tracking the selected supply.

TAS2120

SLASFC6 – AUGUST 2024

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