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PDF MD4123 Data sheet ( Hoja de datos )
| Número de pieza | MD4123 | |
| Descripción | 3W Filterless Mono Class-D Audio Power Amplifier | |
| Fabricantes | MegaPower Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MD4123 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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MD4123
3W Filterless Mono Class-D Audio Power Amplifier
General Description
The MD4123 is a 3W high efficiency filterless
mono class-D audio power amplifier in a SOP8
package,it has high PSRR and differential input
that eliminate noise and RF rectification.
The MD4123 features like 90% efficiency and
small PCB area make the MD4123 class-D
amplifier ideal for cellular handsets. A low noise,
filterless PWM architecture eliminates the output
filter, reducing external component count,
system cost, and simplifying design.
The MD4123 features short circuit protection
and OTP(over temperature protection) thermal
shutdown and UVLO(under voltage lockout).
The MD4123 is available in SOP-8 package.
Block Diagram
Features
PO at 10% THD+N, VDD = 5V
RL = 4 Ω 3.0W (typ)
RL = 8 Ω 1.8W (typ)
PO at 1% THD+N, VDD = 5V
RL = 4 Ω 2.5W (typ)
RL = 8 Ω 1.45W (typ)
Superior Low Noise
Filterless and Low EMI
Less external components required
High efficiency up to 90%
Thermal and over current Protections
RoHS compliant and 100% lead(Pb)-free
Applications
Mobile Phones
PDA,GPS
Portable Electrolic Devices
Desktop Speaker
IN-
IN+
SD
_
+
_
+
Biases&
References
Circuit
PWM
Modulator
Gate
Drive
Ramp
Generator
Shutdown
Buffer
Gate
Drive
Startup
Protection
Logic
Protection
Detect
Circuit
VDD
Vo-
Vo+
GND
www.megapower.com.cn
1
Apr. 2012 Rev.1.0
1 page  
MD4123
3W Filterless Mono Class-D Audio Power Amplifier
Electrical Characteristics
TA= 25°C ,VDD= 5V, G ain= 2V/V,RL= L(33 μ H)+ R + L(33 μH), unless otherw ise noted.
Symbol
VOS
PSRR
CMRR
IIH
IIL
I(Q)
I(SD)
rDS(ON)
f(SW)
Parameter
Output offset voltage
(measured differentially)
Power supply rejection ratio
Common mode rejection
ratio
High-level input current
Low-le vel input current
Quiescent current
Shutdown current
Static Drain-source On-state
Resistance
Output impedance in
SHUTDOWN
Switching frequency
Test Conditions
VI=0V, AV=2V/V, VDD=2.7V to
5.5V
VDD=2.7V to 5.5V
VDD=2.7V to 5.5V
VDD=5.5V, VI=5.5V
VDD=5.5V, VI=-0.3V
VDD=5.5V, no load
VDD=3.6V, no load
V ( S H O U T D O W N)= 0 . 3 5 V,
VDD=2.7V to 5.5V
VDD=3.6V
VDD=5.5V
V ( S H O U T D O W N)= 0 . 3 5 V
VDD=2.7V to 5.5V
Min
Gain
VDD=2.7V to 5.5V
Resistance from shutdown to
GND
Typ Max
1 25
-75 -55
-65 -50
50
5
3.8 5
3.0
0.1 2
400
350
2
250
300kΩ
RI
300
Unit
mV
dB
dB
uA
uA
mA
uA
mΩ
kΩ
kHz
V
V
kΩ
www.megapower.com.cn
5
Apr. 2012 Rev.1.0
5 Page 
MD4123
3W Filterless Mono Class-D Audio Power Amplifier
Test Connection
Signal Generator
VA2230A
Power Supply
+-
VDD
+Out
Input
-Out
GND
Dummy
Load
Low Pass
Filter
Audio
Analyzer
VA2230A
Notes
1. A 33-µH inductor was placed in series with the load resistor to emulate a small speaker for
efficiency measurements.
2. The 30-kHz low-pass filter is required even if the analyzer has an internal low-pass filter.
www.megapower.com.cn
11
Apr. 2012 Rev.1.0
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MD4123.PDF ] | |
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