TDA7572 STMicroelectronics, TDA7572 Datasheet - Page 39

• Manufacturer Part Number: TDA7572
• Description: IC AMP PWM 200W BRIDGE 64HIQUAD
• Manufacturer: STMicroelectronics
• Type: Class Dr

Specifications of TDA7572

• Output Type: 1-Channel (Mono)
• Voltage - Supply: 8 V ~ 58 V
• Features: Digital Inputs, I²C, I²S, Mute, Short-Circuit and Thermal Protection, Standby
• Mounting Type: Surface Mount
• Package / Case: 64-HiQUAD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Max Output Power X Channels @ Load: -

TDA7572
6.2.2
ATTACK[1:0]: Sets the maximum Attack rate of the gain compressor according to the table
below:
Table 30.
Setting in NOI
I
ADDR1/CompEnable - pin 54 -> Gain compression effort selection
Table 31.
Soft-mute function, without pre-limiter
Well-behaved over-modulation protection and current-limiting allow this IC to not require a
pre-limiter before the modulator. This allows the amplifier to always take advantage of the
available supply voltage. A limited output voltage can be done in a crude manner by using
AOUT's max output swing, and counting on its clipping signal to drive the compressor.
A soft mute/unmute is incorporated at AOUT. It works by slowly muxing AOUT from the input
signal to SVR. In this way, dc offsets occurring in any upstream stages are kept inaudible.
The mux slew time is determined by the voltage slew rate at the MUTE_L pin (pin 10), which
is asserted low. Mute can by driven either be by external means, or controlled by I2C
command.
The MUTE bit, present in the input control register (D0, InputControl register), controls
muting by discharging or charging the MUTE_L pin. The default value for this bit for NOI2C
mode is 0 that lead to a charging of mute cap. Abrupt muting is available by use of the
MuteSpeed bit. When MuteSpeed is asserted, MUTE_L is rapidly charged and discharged
by a small resistance (approximately 500 ohms). In the pictures below are reported the two
application circuits and the internal circuitry of mute correspondent to.
Figure 3.
2
CDATA/AttackSel - pin 51 -> Attack/release rate selection
Attack [1:0]
INPUT PIN/VALUE
00
01
10
11
Pin 51
Pin 54
Sets the maximum attack rate of the gain compressor
Attack/release rate and gain compression effort selection
Mute by external command
2
CBUS mode:
External
Mute
Clock counts
2
2
2
2
6
7
8
9
GainTable[1:0]=”00”
Release[1:0] = “10”
Attack[1:0] = “10”
Mute_L
DGND
Nominal time at 400KHz clock
100µA
Input stage and gain compressor
AC00015
1.28ms
160µs
320µs
640µs
GainTable[1:0]=”01”
Release[1:0] = “11”
Attack[1:0] = “11”
VDIG
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