ETC BM0120

BM0120
20W AUDIO CLASS D+
GENERAL DESCRIPTION
The BM0120 is one channel audio amplifier module, using unique close loop and feed forward
compensation techniques (CLFFC—IP belong BM) to achieve better THD+N from 20Hz to 20KHz. The
module can deliver output power up to 35W (RMS) @4ohm load. The module has mute function with
logic high or low control.
The voltage gain can be adjusted in the module via fix feedback resistor, the input signal is flexible.
No other external components from input to output, and connect to speaker directly. Friendly analog
input interface. Very high efficiency , do not need Heat-sink under 20W(RMS)
The BM0120 integrated mute circuit inside , it very suits for application in LCD TV , PDP TV , Projection TV and
Car audio .
APPLICATIONS
Car audio -------2/4 channels
PDP -------------2.1 channel
Projection TV -----2.1 channel
LCD TV--------2 channel
DVD player
Features
Wide VDD input range of +9V ~ +26V
Reduce system cost with no heat sink and save power
Class D+ and CLFFC IP inside
Excellent bass frequency without big bypass DC capacitor inside
Internal thermal protection
Connect to any passive 4 or 8 ohm speaker
No mute on/off noise
THD+N : <[email protected] / 1KHz
SNR : 80db
Cross noise with other channels : 80db
Output power (RMS) is depend on the VDD and load (THD<10%)
b=46mm
@ 4ohm /+24V
@ 4ohm /+18V
@ 4ohm /+12V
@ 8ohm /+24V
Pin1 = Audio input
Pin2 = A-GND
Pin3 = GND
Pin4 = +5V
Pin5 = Mute control
Pin6 = VDD (+9V ~ +25V)
Pin7 =GND
Pin8 = Out –
Pin9 = Out+
6
7
8
9
46mm*31mm
1
2
3
4
5
Very slim size :
a=31mm
30W
20W
13W
15W
Gap between pin1 and a is 2.8mm
Gap between pin1 and pin9 is 40.36mm
Gap between pin1(6) and pin2(7) is 2.54mm
Bookly Micro Electronic Limited Co
BM0120
20W AUDIO CLASS D+
External application circuit:
Power supply (+5V and VDD)
VDD
+9V ~ +28V
+5V
3
2
1
0.47uF
220uF/35V
DGND
Note1:
keep +5V power up same as VDD or +5V earlier.
+5V
Mute="1"
5
Audio input
VDD
4
1
6
8
2
3
AGND
GND
7
9
SPEAKER
4/8 ohm
GND
Note2:
Mute = 1 , un-Mute = 0 or open
Audio input capacitor has been filled in this module, external couple
capacitor is not necessary.
Bookly Micro Electronic Limited Co
BM0120
20W AUDIO CLASS D+
C h am p io n m ic ro
A -A T H D + N vs F R E Q U E N C Y
0 9 /2 6 /0 2 1 1 :3 1 :0 9
2.2
2
1.8
1.6
1.4
1.2
%
1
0.8
0.6
0.4
0.2
0
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
C M8 6 8 5 Ja ck
O u tp u t 1 W . 1 2 V. 8 O h m . L 1 5 u . C 0 .2 2 u
8 9 5 8 C a p 1 u ju s t b e s id e P in 1 ,3 . Ad d S K 1 2 . 8 6 8 5 1 u rig h t b e s id e IC . 1 2 V E C c h a n g e 1 0 0 0 u b e s id e 8 9 5 8 .
ja c k 6 .a t2 c
when application in over 25W , a small heat-sink is expected
Bookly Micro Electronic Limited Co