ETC BA20370

2W Stereo Class-D Audio
Power Amplifier
BA20370
Brief Data Sheet
Preliminary Version
Rev.1.0, 2005.11.24
Biforst Technology Inc.
BA20370
____
2W Stereo Class-D Audio Power Amplifier
2W Stereo Class-D Audio Power Amplifier
BA20370
GENERAL DESCRIPTION
The BA20370 is a 5V class-D amplifier from Biforst Technology. BA20370 provides dc volume
control, lower supply current, high efficiency & few external components for driving speaker directly.
BA20370 also integrates Anti-Pop, Output Short & Over-Heat Protection Circuitry to increase device
reliability. The functionality makes this device ideal for LCD projectors, LCD monitors, powered
speakers & other applications that demand more battery life.
FEATURE
2W Per Channel Into 4-Ω Speakers (THD+N = [email protected])
Operation Voltage From 3.3 To 5.5V
Integrated Anti-Pop Circuitry
Integrated Output Short Protection Circuitry
Integrated Over-Heat Protection Circuitry
Provide DC Volume Control
Preliminary Version
Operate Voltage vs Output Power
2.40
Output Power Per Channel (W)
2.20
2.00
1.80
1.60
1.40
THD 1%-4Ohm
1.20
THD 10%-4Ohm
1.00
THD 1%-8Ohm
0.80
THD 10%-8Ohm
0.60
0.40
0.20
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4.0
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
6.0
0.00
Operate Voltage (V)
Chip List:
Chip Name
2W Stereo Class-D Audio Power Amplifier
IC No.
BA20370
Chip Package
HSOP 28 Pin
_________________________________________________________________________________________________
Biforst Technology, Inc., reserves the right to change product or specifications without notice.
Page 2 of 4
BA20370
____
2W Stereo Class-D Audio Power Amplifier
PIN ASSIGNMENTS
1
28
PVDD_A
PVDD_A
2
27
PVDD_A
ROUT_P_0
3
26
LOUT_P_0
ROUT_P_1
4
25
LOUT_P_1
ROUT_N_0
5
24
LOUT_N_0
ROUT_N_1
6
23
LOUT_N_1
PVSS_A
7
22
PVSS_A
PVSS_A
A
A
PVSS_A
BA20370
PVDD_A
VDD
8
21
VDD
RINP
9
20
LINP
RINN
10
19
LINN
C_BYPASS
11
18
OSC_R
SHUTDOWN_B
12
17
VOLUME
VSS
13
16
OSC_C
VSS
14
15
VSS
PIN LIST & DESCRIPTION
Pin No.
Pin
1
PVDD_A
2
PVDD_A
3
ROUT_P_0
4
5
6
I/O Pad Function
Type
Power
5V power supply for right channel output
Preliminary Version
ROUT_P_1
ROUT_N_0
ROUT_N_1
Output
Right channel positive output
Output
Right channel negative output
Power
5V ground
7
PVSS_A
A
PVSS_A
8
VDD
Power
5V power supply
9
RINP
Input
Right channel positive differential audio input
10
RINN
Input
11
C_BYPASS
Input
Right channel negative differential audio input
Connect a 1-uF capacitor from C_BYPASS to ground for internal bias
reference
Shunt down control for BA2037, Logic low is placed on this terminal for
12
SHUTDOWN_B
Input
shunt down mode, Logic high is placed on this terminal for normal
operation
13
VSS
14
VSS
15
VSS
16
OSC_C
Power
5V ground
Input
with OSC_C. For proper operation, connect a 220-pF capacitor from
A capacitor connected to this terminal sets the oscillation in conjunction
OSC_C to ground
17
VOLUME
Input
18
OSC_R
Input
DC volume control for setting the gain on the internal amplifier. The dc
voltage range is 0 to VDD
A resistor connected to this terminal sets the oscillation in conjunction
with OSC_R. For proper operation, connect a 120-kΩ resistor from
OSC_R to ground
_________________________________________________________________________________________________
Biforst Technology, Inc., reserves the right to change product or specifications without notice.
Page 3 of 4
BA20370
Pin No.
____
Pin
2W Stereo Class-D Audio Power Amplifier
I/O Pad Function
Type
19
LINN
Input
Left channel negative differential audio input
20
LINP
Input
Left channel positive differential audio input
21
VDD
Power
5V power supply
22
PVSS_A
Power
5V ground
23
LOUT_N_1
24
LOUT_N_0
Output
Left channel negative output
25
LOUT_P_1
26
LOUT_P_0
Output
Left channel positive output
27
PVDD_A
28
PVDD_A
Power
5V power supply for left channel output
PACKAGE DIMENSION
HSOP28
Preliminary Version
CONTACT INFORMATION
Biforst Technology Inc.
8F-3, No.26, Tai Yuen St., Jubei City, Hsin-Chu, Taiwan, R.O.C.
Tel: 886-3-552-6521; Fax: 886-3-552-6558; Email: [email protected]
Version History
Version
Date
1.0
2005.11.24
Page
Description
First Release
_________________________________________________________________________________________________
Biforst Technology, Inc., reserves the right to change product or specifications without notice.
Page 4 of 4