ACS32201 datasheet(33/65 Pages) IDT

33 / 65 page

IDT CONFIDENTIAL

V0.6 07/11

ACS32201

LOW-POWER, HIGH-FIDELITY, CLASS-D AMPLIFIER

Figure 13. Constant Output Power nominal and high/low

3.14.2.2. Under Voltage Lock Out

When the PVDD supply becomes low, the BTL amplifier may be disabled to help prevent undesir-

able amplifier operation (overheat) or system level problems (battery under-voltage.)

The same circuit that monitors the PVDD supply to help maintain a constant output power is used to

monitor the PVDD supply for a critical under-voltage situation. If the sense circuit consistently returns

a 0 code then the PVDD supply is less than the minimum required for proper operation. To prevent

accidental shutdown due to a noisy supply at the minimum operating range, the output of the PVDD

sense circuit will be averaged for at least 200ms.

3.14.2.3. Registers

•

Constant Output Power 1

Bit

Label

Type

Default

Description

R34 (22h)

Constant Output

Power 1

COPAtten

1 = Constant Output Power function will use attenuate

the BTL output if the PVDD sense circuit returns a code

higher than the target value.

6COPGain

1 = Constant Output Power function will use attenuate

the BTL output if the PVDD sense circuit returns a code

higher than the target value.

HDeltaEn

1 = If the PVDD code value has changed more than 4

counts since the last gain adjustment, the output will be

reduced rapidly then slowly returned to the target level.

4:0

COPTarget[4:0]

5-bit target for the Constant Output Power function.

Table 38. Constant Output Power 1 Register

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.1

1.2

3.1

4.1

5.1

Off

Nom

Low

ACS32201 Datasheet(PDF) 33 Page - Integrated Device Technology

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