Audio Amplifier. XA9221 Datasheet

XA9221 Datasheet PDF


Part Number

XA9221

Description

2 x 20W Stereo Class-D Audio Amplifier

Manufacture

X-Audio

Total Page 19 Pages
Datasheet
Download XA9221 Datasheet



XA9221
XA9221
2x20W Stereo Class-D Audio Amplifier with Power Limit
Features
Single supply voltage
4.5V ~ 26V for loudspeaker driver
Built-in LDO output 5V for others
Loudspeaker power from 24V supply
BTL Mode: 20W/CH into 8@<1% THD+N
PBTL Mode: 40W/CH into 4@<10% THD+N
Loudspeaker power from 12V supply
BTL Mode: 10W/CH into 8@10% THD+N
88% efficient Class-D operation eliminates need
for heat sink
Differential inputs
Four selectable, fixed gain settings
Internal oscillator
Short-Circuit protection with auto recovery option
Under-Voltage detection
Over-Voltage protection
Pop noise and click noise reduction
Adjustable power limit function for speaker
protection
Output DC detection for speaker protection
Filter-Free operation
Over temperature protection with auto recovery
Superior EMC performance
Applications
TV audio
Boom-Box
Powered speaker
Monitors
Consumer Audio Equipment
Description
The XA9221 is a high efficiency stereo class-D
audio amplifier with adjustable power limit function.
The loudspeaker driver operates from 4.5V~26V
supply voltage and analog circuit operates at 5V
supply voltage. It can deliver 20W/CH output power
into 8loudspeaker within 1% THD+N at 24V
supply voltage and without external heat sink when
playing music.
XA9221 provides parallel BTL (Mono)
application, and it can deliver 40W into 4
loudspeaker at 24V supply voltage. The adjustable
power limit function allows user to set a voltage rail
lower than half of 5V to limit the amount of current
through the speaker.
Output DC detection prevents speaker damage
from long-time current stress. XA9221 provides
superior EMC performance for filter-free application.
The output short circuit and over temperature
protection include auto-recovery feature.
Simplified Application Circuit
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XA9221
XA9221
2x20W Stereo Class-D Audio Amplifier with Power Limit
Pin Assignments
Pin Description
NAME
SD
FAULT
LINP
LINN
GAIN0
GAIN1
AVCC
AGND
GVDD
PLIMIT
RINN
RINP
TEST
PBTL
E-TSSOP
-28L
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TYP
DESCRIPTION
Shutdown signal for IC (low = disabled, high = operational). Voltage compliance
I
to AVCC.
Open drain output used to display short circuit or dc detect fault. Voltage
compliant to AVCC. Short circuit faults can be set to auto-recovery by
O
connecting FAULTB pin to SD pin. Otherwise, both short circuit faults and dc
detect faults must be reset by cycling AVCC.
I Positive audio input for left channel. Biased at 2.5V.
I Negative audio input for left channel. Biased at 2.5V.
I Gain select least significant bit. Voltage compliance to AVCC.
I Gain select most significant bit. Voltage compliance to AVCC.
P Analog supply.
P Analog signal ground. Connect to the thermal pad.
O 5V regulated output, also used as supply for PLIMIT function.
Power limit level adjustment. Connect a resistor divider from GVDD to GND to
I set power limit. Give V(PLIMIT) <2.4V to set power limit level. Connect to GVDD
(>2.4V) or GND to disable power limit function.
I Negative audio input for right channel. Biased at 2.5V.
I Positive audio input for right channel. Biased at 2.5V.
I Test mode pin.
Parallel BTL mode switch, high for parallel BTL output. Voltage compliance to
I
AVCC.
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