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PDF ft2820 Data sheet ( Hoja de datos )
| Número de pieza | ft2820 | |
| Descripción | 4W Dual-Pump Class-G Audio Power Amplifier | |
| Fabricantes | Fangtek | |
| Logotipo |  |
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ft2820
4W Dual-PumpTM Class-G Audio Power Amplifier
GENERAL DESCRIPTION
The ft2820 is a 4W boosted Class-G audio power
amplifier based upon a proprietary Dual-PumpTM
topology with automatic level control (ALC). It
operates from 3V to 5.5V supply. When operating
with a 4.2V supply voltage, it is capable of driving a
4Ω speaker load at a continuous average output of
4W with 10% THD+N. Its high efficiency, up to 82%,
helps extend battery life for portable device
applications.
In ft2820, the power supply rail for the amplifier’s
output stage is internally boosted and regulated at
6V by an adaptive charge pump based upon the
Dual-PumpTM topology, thus allowing for a much
louder audio output than a stand-alone one directly
connected to the battery. It makes ft2820 an ideal
audio solution for portable devices that are powered
by a single-cell lithium battery while requiring higher
audio loudness.
The ft2820 features ALC on the audio output signals,
which detects the output clipping caused by the
over-level input signal and automatically adjusts the
voltage gain of the amplifier to eliminate the clipping
while maintaining the maximally-allowed dynamic
range of the audio output signals. The ALC also
eliminates the output clipping due to low battery
supply voltage.
FEATURES
Proprietary Dual-PumpTM topology
Filterless Class-G operation with an integrated
charge pump
Automatic level control to eliminate output
clipping
Integrated lowpass filter for out-of-band noise
rejection
Maximum output power: 4W
(VDD=4.2V, RL=4Ω, THD+N=10%, ALC Off)
Constant output power: 3.3W
(VDD=4.2V, RL=4Ω, THD+N=0.5%, ALC On)
High power efficiency up to 82%
Low THD+N: 0.05%
(VDD=3.6V, f=1kHz, RL=4Ω, Po=1W)
ALC dynamic range: 10.5dB
Low quiescent current: 2.7mA @ VDD=3.6V
High PSRR: 75dB @ 217Hz
Two gain settings: 24.1/27.6dB
One-wire pulse control to set operating mode
and voltage gain
Auto-recovering short-circuit protection
Available in TSSOP-20L package
APPLICATIONS
Portable Speakers
MID
Mobile Phones
APPLICATION CIRCUIT
L
VDD
Cs
10uF
C F1 2.2uF C F2 2.2uF
Cs
1uF
H
CVDD CP1 CN1 CP2 CN2
AVDD
PVOUT
PVDD
ft2820
EN
PGND
Cin 470nF
Cin 470nF
INP VOP
VON
INN
GND(AGND/CGND)
COUT
10uF 100uF
SEP, 2013
Figure 1: Typical Application Circuit Diagram
www.fangtek.com.cn
1
1 page  
ft2820
ELECTRICAL CHARACTERISTICS
VDD=3.6V, Mode 1, CAVDD=1µ F, CCVDD=10µ F, CF1=CF2 =2.2µ F, COUT=10µ F//100uF, f=1kHz,
CIN=470nF, RL=4Ω+33µ H, TA=25°C, unless otherwise specified.
SYMBOL
VDD
VUVLOUP
VUVLODN
IDD
ISD
VIN
VIL
TOTSD
THYS
PARAMETER
Supply Voltage
Power-Up Threshold Voltage
Power-Off Threshold Voltage
Supply Quiescent Current
Inputs AC-Grounded
Shutdown Current
EN High Input Voltage
EN Low Input Voltage
Over-Temperature Threshold
Over-Temperature Hysteresis
η Power Efficiency
CHARGE PUMP
PVOUT
Charge Pump Output Voltage
IOUT
Max. Output Current
TPRECH
Pre-charge time
TSS Soft-start Time
fPUMP
Charge Pump Frequency
CLASS-G AMPLIFIER
PO, MAX
Maximum Output Power
Load=8Ω+33µH
(Mode 3, ALC Off)
Maximum Output Power
Load=4Ω+33µH
(Mode 3, ALC Off)
PO, ALC
Constant Output Power
Load=8Ω+33µH
(Mode 1 & 2, ALC On)
(CMoondseta1nt&O2u,tpAuLtCPOowne) r
Load=4Ω+33µH
(Mode 1 & 2, ALC On)
AV Overall Voltage Gain
TEST CONDITIONS
AVDD, CVDD
VDD from Low to High
VDD from High to Low
EN High, VDD=3.6V
EN High, VDD=5.0V
VDD = 3.0V to 5.5V, EN Low
PO=0.5W
PO=2.0W
IPVDD=100mA
VDD=4.2V
COUT=10µF//100uF
Vin from 0.1VRMS to 0.3VRMS
THD+N=10%, VDD=4.2V
THD+N=10%, VDD=3.6V
THD+N=1%, VDD=4.2V
THD+N=1%, VDD=3.6V
THD+N=10%, VDD=4.2V
THD+N=10%, VDD=3.6V
THD+N=1%, VDD=4.2V
THD+N=1%, VDD=3.6V
Vin=300mVRMS, VDD=4.2V
Vin=300mVRMS, VDD=3.6V
Vin=300mVRMS, VDD=4.2V
Vin=300mVRMS, VDD=3.6V
Mode 1 (ALC On)
Mode 2 (ALC On)
Mode 3 (ALC Off)
MIN TYP MAX UNIT
3.0 5.5 V
2.2 V
2.0 V
2.7 5 mA
3.0 6 mA
0.1 1 µA
1.2 V
0.4 V
160 °C
20 °C
82 %
72 %
5.7 6.0 6.3
V
1.0 A
3 ms
500 µs
1 MHz
2.6
2.4
2.1
2.0
W
4.0
3.5
3.4
3.0
2.0
1.9
W
3.3
2.9
27.6
24.1 dB
24.1
SEP, 2013
http://www.fangtek.com.cn
5
5 Page 
TYPICAL PERFORMANCE CHARACTERISTICS (Cont’d)
ft2820
THD+N vs. Output Power
100
VDD=3.6V, RL=8Ω+33µH, Mode 3
10 VDD=4.2V, RL=8Ω+33µH, Mode 3
1
0.1
0.01
10
100 1000
Output Power (mW)
Figure 21: THD+N vs. Output Power
THD+N vs. Output Power
100
VDD=3.6V, RL=4Ω+33µH, Mode 3
10 VDD=4.2V, RL=4Ω+33µH, Mode 3
1
0.1
10000
0.01
10
100 1000
Output Power (mW)
Figure 22: THD+N vs. Output Power
10000
THD+N vs. Output Power
100
VDD=3.6V, RL=8Ω+33µH, Mode 1
VDD=4.2V, RL=8Ω+33µH, Mode 1
10
1
0.1
0.01
10
100 1000
Input Voltage (mVrms)
Figure 23: THD+N vs. Input Voltage
10000
THD+N vs. Output Power
100
VDD=3.6V, RL=4Ω+33µH, Mode 1
VDD=4.2V, RL=4Ω+33µH, Mode 1
10
1
0.1
0.01
10
100 1000
Input Voltage (mVrms)
Figure 24: THD+N vs. Input Voltage
10000
THD+N vs. Output Power
100
VDD=3.6V, RL=8Ω+33µH, Mode 2
VDD=4.2V, RL=8Ω+33µH, Mode 2
10
1
0.1
0.01
10
100 1000
Input Voltage (mVrms)
Figure 25: THD+N vs. Input Voltage
THD+N vs. Output Power
100
VDD=3.6V, RL=4Ω+33µH, Mode 2
VDD=4.2V, RL=4Ω+33µH, Mode 2
10
1
0.1
10000
0.01
10
100 1000
Input Voltage (mVrms)
Figure 26: THD+N vs. Input Voltage
10000
SEP, 2013
http://www.fangtek.com.cn
11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet ft2820.PDF ] | |
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