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PDF NCP2821 Data sheet ( Hoja de datos )
| Número de pieza | NCP2821 | |
| Descripción | 2.65W Filterless | |
| Fabricantes | ON Semiconductor | |
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NCP2821
2.65 W Filterless with
Selectable Gain Class−D
Audio Amplifier
NCP2821 is a cost effective mono audio power amplifier designed
for portable communication device applications such as mobile
phones. The internal gain setting between 6 dB and 12 dB will also
save external gain setting resistors. To achieve a typical audio mono
application, you only need an external capacitor for filtering the power
supply. The NCP2821 processes analog inputs with a PWM technique
that lowers significantly output noise and THD.
This part is capable of delivering 2.65 W of continuous average
power to a 4.0 W BTL load from a 5.0 V power supply. Operating on a
single 3 V supply, the output power stage can provide 500 mW to an
8.0 W BTL load with less than 1% THD+N. For cellular handsets or
PDAs it offers space and cost savings because no output filter is
required when using inductive transducers. Its improved Class−D
technology makes it suitable for portable devices. With 90%
efficiency and very low shutdown current, it increases widely the
lifetime of your battery compared to a ClassAB solution. It also
minimizes the junction temperature.
It fully rejects “pop & click” noises with a fast start−up time of 9 ms.
Added to a −65 dB PSRR, the NCP2821 audio power amplifier is
specifically designed to provide high quality output power from low
supply voltage, requiring only 1 external capacitor.
Features
• Optimized PWM Output Stage: Filterless Capability
• Selectable Gain of 6 dB or 12 dB: No Need for External Gain Setting
Resistors
• Efficiency up to 90% and Low Quiescent Current
Maximum Battery Life and Minimum Heat
• High Output Power Capability: 1.4 W with 8.0 W Load
• Wide Supply Voltage Range: 2.5−5.5 V Operating Voltage
• High Performance, THD+N of 0.05%
• Excellent PSRR (−65 dB): No Need for Voltage Regulation
• Surface Mounted Package 9−Pin Flip−Chip CSP
• Fully Differential Capability: No Need for Input Coupling Capacitor
• Very Fast Turn On Time: 9.0 ms (typ)
• “Pop and Click” Noise Protection Circuitry
Applications
• Cellular Phone
• Personal Computer
• PDAs
• Portable Electronic Devices
http://onsemi.com
MARKING
DIAGRAM
9−PIN FLIP−CHIP CSP MAUG
FC SUFFIX
AYWW
1 CASE 499AL
A1
MAU = Device Code
A = Assembly Location
Y = Year
WW = Work Week
G = Pb−Free Package
PIN CONNECTIONS
9−Pin Flip−Chip CSP
A1 A2 A3
INP GS OUTM
B1 B2 B3
VP VP GND
C1 C2 C3
INM SD OUTP
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information on page 18 of
this data sheet.
Audio
Input
from
DAC
Input from
Micro
controller
VP
INP
INM
GS
SD
1 mF
OUTM
OUTP
GND
Cs
1.6 mm
© Semiconductor Components Industries, LLC, 2006
February, 2006 − Rev. 0
1
2.7 mm
Solution Size
Publication Order Number:
NCP2821/D
1 page  
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NCP2821
ELECTRICAL CHARACTERISTICS (Limits apply for TA = +25°C unless otherwise noted)
Characteristic
Symbol
Conditions
Total Harmonic Distortion + Noise
THD+N
Vp = 5.0 V, RL = 8 W,
f = 1 kHz, Pout = 0.25 W
Vp = 3.6 V, RL = 8 W,
f = 1 kHz, Pout = 0.25 W
Efficiency
h RL = 8 W, f = 1 kHz
Vp = 5 V, Pout = 1.2 W
Vp = 3.6 V, Pout = 600 mW
RL = 4 W, f = 1 kHz
Vp = 5 V, Pout = 2 W
Vp = 3.6 V, Pout = 600 mW
Common Mode Rejection Ratio
CMRR
Vp = 2.5 V to 5.5 V, G = 6 dB
Vic = 0.5 V to Vp − 0.8 V
Vp = 3.6 V, Vic = 1 Vpp
G = 6 dB, f = 1 kHz
G = 12 dB, f = 1 kHz
Power Supply Rejection Ratio
PSRR
Vpripple_pk−pk = 200 mV, RL = 8 W,
Inputs AC grounded, Vp = 3.6 V
f = 217 Hz
f = 1 kHz
Min
−
−
−
−
−
−
−
Typ Max
0.05 −
0.09 −
91 −
90 −
82 −
81 −
−62
−59
−53
−63 −
−63 −
Unit
%
%
%
dB
dB
Audio Input
Signal
+
−
Ci
Ci
Ri
Ri
Power
Supply
+
−
NCP2821
INP OUTM
INM OUTP
VP GND
4.7 mF
Load
30 kHz
Low Pass
Filter
+
Measurement
Input
−
Figure 2. Test Setup for Graphs
NOTES:
1. Unless otherwise noted, Ci = 100 nF and Ri= 150 kW. Thus, the gain setting is 2 V/V and the cutoff frequency of the
input high pass filter is set to 10 Hz. Input capacitors are shorted for CMRR measurements.
2. To closely reproduce a real application case, all measurements are performed using the following loads:
RL = 8 W means Load = 15 mH + 8 W + 15 mH
RL = 4 W means Load = 15 mH + 4 W + 15 mH
Very low DCR 15 mH inductors (50 mW) have been used for the following graphs. Thus, the electrical load
measurements are performed on the resistor (8 W or 4 W) in differential mode.
3. For Efficiency measurements, the optional 30 kHz filter is used. An RC low−pass filter is selected with
(100 W, 47 nF) on each PWM output.
http://onsemi.com
5
5 Page 
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11
10
9
8
7
6
2.5
TA = +85°C
TA = +25°C
TA = −40°C
3.5 4.5
POWER SUPPLY (V)
Figure 33. Turn on Time
NCP2821
8
7
TA = +25°C
6 TA = −40°C
TA = +85°C
5
4
5.5 2.5
3.5 4.5
POWER SUPPLY (V)
Figure 34. Turn off Time
5.5
Turn on time
Output
differential
voltage
Output
differential
voltage
Shutdown signal
0 2 4 6 8 10 12 14 16 18 20
(ms)
Figure 35. Turn on sequence
Vp = 3.6 V, RL = 8 W
Turn off
time
Shutdown
signal
0 1 2 3 4 5 6 7 8 9 10
(ms)
Figure 36. Turn off sequence
Vp = 3.6 V, RL = 8 W
http://onsemi.com
11
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| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet NCP2821.PDF ] | |
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