ONSEMI NCP2820FCT1G

NCP2820
2.65 W Filterless Class−D
Audio Power Amplifier
Features
• Optimized PWM Output Stage: Filterless Capability
• Efficiency up to 90%
•
•
•
•
•
•
•
Low 2.5 mA Typical Quiescent Current
Large Output Power Capability: 1.4 W with 8.0 Load (CSP) and
THD + N < 1%
Wide Supply Voltage Range: 2.5−5.5 V Operating Voltage
High Performance, THD+N of 0.03% @ Vp = 5.0 V,
RL = 8.0 , Pout = 100 mW
Excellent PSRR (−65 dB): No Need for Voltage Regulation
Surface Mounted Package 9−Pin Flip−Chip CSPand UDFN8
Fully Differential Design. Eliminates Two Input Coupling Capacitors
Very Fast Turn On/Off Times with Advanced Rising and Falling
Gain Technique
External Gain Configuration Capability
Internally Generated 250 kHz Switching Frequency
Short Circuit Protection Circuitry
“Pop and Click” Noise Protection Circuitry
•
•
•
•
• Pb−Free Packages are Available
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MARKING
DIAGRAMS
9−PIN
FLIP−CHIP CSP
1
FC SUFFIX
CASE 499AL
8
C1
1
ZB MG
1
8 PIN UDFN 2x2.2
MU SUFFIX
CASE 506AV
A
Y
WW
M
G
= Assembly Location
= Year
= Work Week
= Date Code
= Pb−Free Package
ORDERING INFORMATION
See detailed ordering and shipping information on page 20 of
this data sheet.
Cs
Audio
Input
from
DAC
VP
Ri
INP
Ri
INM
Input from
Microcontroller
Applications
•
•
•
•
A3
A1
1
MAQG
AYWW
The NCP2820 is a cost−effective mono Class−D audio power
amplifier capable of delivering 2.65 W of continuous average power
to 4.0 from a 5.0 V supply in a Bridge Tied Load (BTL)
configuration. Under the same conditions, the output power stage can
provide 1.4 W to a 8.0 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 tranducers. With more
than 90% efficiency and very low shutdown current, it increases the
lifetime of your battery and drastically lowers the junction
temperature.
The NCP2820 processes analog inputs with a pulse width
modulation technique that lowers output noise and THD when
compared to a conventional sigma−delta modulator. The device allows
independent gain while summing signals from various audio sources.
Thus, in cellular handsets, the earpiece, the loudspeaker and even the
melody ringer can be driven with a single NCP2820. Due to its low
42V noise floor, A−weighted, a clean listening is guaranteed no
matter the load sensitivity.
OUTM
OUTP
SD
GND
Cellular Phone
Portable Electronic Devices
PDAs and Smart Phones
Portable Computer
Cs
Ri
1.6 mm
Ri
3.7 mm
© Semiconductor Components Industries, LLC, 2006
November, 2006 − Rev. 5
1
Publication Order Number:
NCP2820/D
NCP2820
PIN CONNECTIONS
UDFN8
9−Pin Flip−Chip CSP
A1
A2
A3
SD
1
8
OUTM
INP
GND
OUTM
VP
2
7
GND
B1
B2
B3
VP
VP
INP
3
6
GND
VP
C1
C2
C3
INM
4
5
OUTP
INM
SD
(Top View)
(Top View)
OUTP
BATTERY
Cs
Vp
Rf
INM
OUTP
RAMP
GENERATOR
Data
Processor
Negative
Differential
Input
Ri
CMOS
Output
Stage
OUTM
Rf
INP
300 k
Positive
Differential
Input
RL = 8 Ri
Shutdown
Control
GND
SD
Vih
Vil
Figure 1. Typical Application
PIN DESCRIPTION
Pin No.
CSP
UDFN8
Symbol
Type
A1
3
INP
I
Positive Differential Input.
A2
7
GND
I
Analog Ground.
A3
8
OUTM
O
Negative BTL Output.
B1
2
Vp
I
Analog Positive Supply. Range: 2.5 V – 5.5 V.
B2
6
Vp
I
Power Analog Positive Supply. Range: 2.5 V – 5.5 V.
B3
7
GND
I
Analog Ground.
C1
4
INM
I
Negative Differential Input.
C2
1
SD
I
The device enters in Shutdown Mode when a low level is applied on this pin. An internal
300 k resistor will force the device in shutdown mode if no signal is applied to this pin. It
also helps to save space and cost.
C3
5
OUTP
O
Positive BTL Output.
Description
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2
NCP2820
MAXIMUM RATINGS
Symbol
Rating
Vp
Supply Voltage
Vin
Input Voltage
Iout
Max Output Current (Note 1)
Pd
Power Dissipation (Note 2)
TA
Operating Ambient Temperature
TJ
Max Junction Temperature
Tstg
Storage Temperature Range
RJA
Thermal Resistance Junction−to−Air
−
−
ESD Protection
Human Body Model (HBM) (Note 4)
Machine Model (MM) (Note 5)
−
Latchup Current @ TA = 85°C (Note 6)
MSL
Active Mode
Shutdown Mode
9−Pin Flip−Chip
UDFN8
9−Pin Flip−Chip
UDFN8
Moisture Sensitivity (Note 7)
Max
Unit
6.0
7.0
V
−0.3 to VCC +0.3
V
1.5
A
Internally Limited
−
−40 to +85
°C
150
°C
−65 to +150
°C
90 (Note 3)
50
°C/W
> 2000
> 200
V
$70
$100
mA
Level 1
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. The device is protected by a current breaker structure. See “Current Breaker Circuit” in the Description Information section for more
information.
2. The thermal shutdown is set to 160°C (typical) avoiding irreversible damage to the device due to power dissipation.
3. For the 9−Pin Flip−Chip CSP package, the RJA is highly dependent of the PCB Heatsink area. For example, RJA can equal 195°C/W with
50 mm2 total area and also 135°C/W with 500 mm2. When using ground and power planes, the value is around 90°C/W, as specified in table.
4. Human Body Model: 100 pF discharged through a 1.5 k resistor following specification JESD22/A114. On 9−Pin Flip−Chip, B2 Pin (VP)
is qualified at 1500 V.
5. Machine Model: 200 pF discharged through all pins following specification JESD22/A115.
6. Latchup Testing per JEDEC Standard JESD78.
7. Moisture Sensitivity Level (MSL): 1 per IPC/JEDEC standard: J−STD−020A.
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3
NCP2820
ELECTRICAL CHARACTERISTICS (Limits apply for TA = +25°C unless otherwise noted) (NCP2820FCT1G and NCP2820FCT2G)
Characteristic
Symbol
Conditions
Min
Typ
Max
Unit
Operating Supply Voltage
Vp
TA = −40°C to +85°C
2.5
−
5.5
V
Supply Quiescent Current
Idd
Vp = 3.6 V, RL = 8.0 Vp = 5.5 V, No Load
Vp from 2.5 V to 5.5 V, No Load
TA = −40°C to +85°C
−
−
2.15
2.61
−
−
mA
−
−
4.6
Shutdown Current
Isd
Vp = 4.2 V
TA = +25°C
TA = +85°C
−
−
0.42
0.45
0.8
−
Vp = 5.5 V
TA = +25°C
TA = +85°C
−
−
0.8
0.9
1.5
−
1.2
−
−
A
A
Shutdown Voltage High
Vsdih
Shutdown Voltage Low
Vsdil
−
−
0.4
V
Switching Frequency
Fsw
Vp from 2.5 V to 5.5 V
TA = −40°C to +85°C
190
250
310
kHz
G
RL = 8.0 285 k
Ri
300 k
Ri
315 k
Ri
V
V
Output Impedance in Shutdown Mode
ZSD
−
300
−
Resistance from SD to GND
Rs
−
−
300
−
k
Output Offset Voltage
Vos
Vp = 5.5 V
−
6.0
−
mV
Turn On Time
Ton
Vp from 2.5 V to 5.5 V
−
9.0
−
ms
Turn Off Time
Toff
Vp from 2.5 V to 5.5 V
−
5.0
−
ms
Thermal Shutdown Temperature
Tsd
−
−
160
−
Output Noise Voltage
Vn
Vp = 3.6 V, f = 20 Hz to 20 kHz
no weighting filter
with A weighting filter
−
−
65
42
−
−
RL = 8.0 , f = 1.0 kHz, THD+N < 1%
Vp = 2.5 V
Vp = 3.0 V
Vp = 3.6 V
Vp = 4.2 V
Vp = 5.0 V
−
−
−
−
−
0.32
0.48
0.7
0.97
1.38
−
−
−
−
−
RL = 8.0 , f = 1.0 kHz, THD+N < 10%
Vp = 2.5 V
Vp = 3.0 V
Vp = 3.6 V
Vp = 4.2 V
Vp = 5.0 V
−
−
−
−
−
0.4
0.59
0.87
1.19
1.7
−
−
−
−
−
RL = 4.0 , f = 1.0 kHz, THD+N < 1%
Vp = 2.5 V
Vp = 3.0 V
Vp = 3.6 V
Vp = 4.2 V
Vp = 5.0 V
−
−
−
−
−
0.49
0.72
1.06
1.62
2.12
−
−
−
−
−
RL = 4.0 , f = 1.0 kHz, THD+N < 10%
Vp = 2.5 V
Vp = 3.0 V
Vp = 3.6 V
Vp = 4.2 V
Vp = 5.0 V
−
−
−
−
−
0.6
0.9
1.33
2.0
2.63
−
−
−
−
−
Gain
RMS Output Power
Po
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4
V
°C
Vrms
W
W
W
W
NCP2820
ELECTRICAL CHARACTERISTICS (Limits apply for TA = +25°C unless otherwise noted) (NCP2820FCT1G and NCP2820FCT2G)
Characteristic
Efficiency
Total Harmonic Distortion + Noise
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Symbol
Conditions
Min
Typ
Max
−
RL = 8.0 , f = 1.0 kHz
Vp = 5.0 V, Pout = 1.2 W
Vp = 3.6 V, Pout = 0.6 W
−
−
91
90
−
−
RL = 4.0 , f = 1.0 kHz
Vp = 5.0 V, Pout = 2.0 W
Vp = 3.6 V, Pout = 1.0 W
−
−
82
81
−
−
−
0.05
−
−
0.09
−
−
−62
−
−
−
−56
−57
−
−
THD+N
CMRR
PSRR
Vp = 5.0 V, RL = 8.0 ,
f = 1.0 kHz, Pout = 0.25 W
Vp = 3.6 V, RL = 8.0 ,
f = 1.0 kHz, Pout = 0.25 W
Vp from 2.5 V to 5.5 V
Vic = 0.5 V to Vp − 0.8 V
Vp = 3.6 V, Vic = 1.0 Vpp
f = 217 Hz
f = 1.0 kHz
Vp_ripple_pk−pk = 200 mV, RL = 8.0 ,
Inputs AC Grounded
Vp = 3.6 V
f = 217 kHz
f = 1.0 kHz
Unit
%
%
dB
dB
−
−
−62
−65
−
−
ELECTRICAL CHARACTERISTICS (Limits apply for TA = +25°C unless otherwise noted) (NCP2820MUTBG)
Characteristic
Symbol
Conditions
Min
Typ
Max
Unit
Operating Supply Voltage
Vp
TA = −40°C to +85°C
2.5
−
5.5
V
Supply Quiescent Current
Idd
Vp = 3.6 V, RL = 8.0 Vp = 5.5 V, No Load
Vp from 2.5 V to 5.5 V, No Load
TA = −40°C to +85°C
−
−
2.15
2.61
−
−
mA
−
−
3.8
Vp = 4.2 V
TA = +25°C
TA = +85°C
−
−
0.42
0.45
0.8
2.0
Vp = 5.5 V
TA = +25°C
TA = +85°C
−
−
0.8
0.9
1.5
−
1.2
−
−
Shutdown Current
Isd
A
A
Shutdown Voltage High
Vsdih
Shutdown Voltage Low
Vsdil
−
−
0.4
V
Switching Frequency
Fsw
Vp from 2.5 V to 5.5 V
TA = −40°C to +85°C
180
240
300
kHz
G
RL = 8.0 285 k
Ri
300 k
Ri
315 k
Ri
V
V
ZSD
−
20
−
k
Gain
Output Impedance in Shutdown Mode
V
Resistance from SD to GND
Rs
−
−
300
−
k
Output Offset Voltage
Vos
Vp = 5.5 V
−
6.0
−
mV
Turn On Time
Ton
Vp from 2.5 V to 5.5 V
−
1.0
−
s
Turn Off Time
Toff
Vp from 2.5 V to 5.5 V
−
1.0
−
s
Thermal Shutdown Temperature
Tsd
−
−
160
−
°C
Output Noise Voltage
Vn
Vp = 3.6 V, f = 20 Hz to 20 kHz
no weighting filter
with A weighting filter
−
−
65
42
−
−
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5
Vrms
NCP2820
ELECTRICAL CHARACTERISTICS (Limits apply for TA = +25°C unless otherwise noted) (NCP2820MUTBG)
Characteristic
RMS Output Power
Efficiency
Total Harmonic Distortion + Noise
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Symbol
Conditions
Min
Typ
Max
Po
RL = 8.0 , f = 1.0 kHz, THD+N < 1%
Vp = 2.5 V
Vp = 3.0 V
Vp = 3.6 V
Vp = 4.2 V
Vp = 5.0 V
−
−
−
−
−
0.22
0.33
0.45
0.67
0.92
−
−
−
−
−
RL = 8.0 , f = 1.0 kHz, THD+N < 10%
Vp = 2.5 V
Vp = 3.0 V
Vp = 3.6 V
Vp = 4.2 V
Vp = 5.0 V
−
−
−
−
−
0.36
0.53
0.76
1.07
1.49
−
−
−
−
−
RL = 4.0 , f = 1.0 kHz, THD+N < 1%
Vp = 2.5 V
Vp = 3.0 V
Vp = 3.6 V
Vp = 4.2 V
Vp = 5.0 V
−
−
−
−
−
0.24
0.38
0.57
0.83
1.2
−
−
−
−
−
RL = 4.0 , f = 1.0 kHz, THD+N < 10%
Vp = 2.5 V
Vp = 3.0 V
Vp = 3.6 V
Vp = 4.2 V
Vp = 5.0 V
−
−
−
−
−
0.52
0.8
1.125
1.58
2.19
−
−
−
−
−
RL = 8.0 , f = 1.0 kHz
Vp = 5.0 V, Pout = 1.2 W
Vp = 3.6 V, Pout = 0.6 W
−
−
87
87
−
−
RL = 4.0 , f = 1.0 kHz
Vp = 5.0 V, Pout = 2.0 W
Vp = 3.6 V, Pout = 1.0 W
−
−
79
78
−
−
−
0.05
−
−
0.06
−
−
−62
−
−
−
−56
−57
−
−
−
THD+N
CMRR
PSRR
Vp = 5.0 V, RL = 8.0 ,
f = 1.0 kHz, Pout = 0.25 W
Vp = 3.6 V, RL = 8.0 ,
f = 1.0 kHz, Pout = 0.25 W
Vp from 2.5 V to 5.5 V
Vic = 0.5 V to Vp − 0.8 V
Vp = 3.6 V, Vic = 1.0 Vpp
f = 217 Hz
f = 1.0 kHz
Vp_ripple_pk−pk = 200 mV, RL = 8.0 ,
Inputs AC Grounded
Vp = 3.6 V
f = 217 kHz
f = 1.0 kHz
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6
Unit
W
W
W
W
%
%
dB
dB
−
−
−62
−65
−
−
NCP2820
Ci
+
Audio Input
Signal
−
NCP2820
Ri
INP
Ci
Ri
OUTM
Load
INM
OUTP
VP
30 kHz
Low Pass
Filter
+
Measurement
Input
−
GND
4.7 F
Power
Supply
+
−
Figure 2. Test Setup for Graphs
NOTES:
1. Unless otherwise noted, Ci = 100 nF and Ri= 150 k. 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 means Load = 15 H + 8 + 15 H
RL = 4 means Load = 15 H + 4 + 15 H
Very low DCR 15 H inductors (50 m) have been used for the following graphs. Thus, the electrical load
measurements are performed on the resistor (8 or 4 ) in differential mode.
3. For Efficiency measurements, the optional 30 kHz filter is used. An RC low−pass filter is selected with
(100 , 47 nF) on each PWM output.
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NCP2820
TYPICAL CHARACTERISTICS
100
100
NCP2820 CSP
EFFICIENCY (%)
80
90
DIE TEMPERATURE (°C)
90
NCP2820 DFN
70
60
50
40
Class AB
30
Vp = 5 V
RL = 8 20
10
80
70
50
40
20
0.2
0.4
0.6
Pout (W)
0.8
Vp = 5 V
RL = 8 60
30
0
0
Class AB
1
NCP2820
0
0.6
0.8
1.0
1.2
1.4
Figure 4. Die Temperature vs. Pout
Vp = 5 V, RL = 8 , f = 1 kHz @ TA = +25°C
60
100
NCP2820 CSP
80
55
DIE TEMPERATURE (°C)
90
EFFICIENCY (%)
0.4
Pout (W)
Figure 3. Efficiency vs. Pout
Vp = 5 V, RL = 8 , f = 1 kHz
NCP2820 DFN
70
60
50
40
Class AB
30
20
Vp = 3.6 V
RL = 8 10
50
45
0.1
0.2
0.3
0.4
Pout (W)
0.5
0.6
Vp = 3.6 V
RL = 8 40
35
30
20
0
Class AB
25
0
0.7
NCP2820
0
DIE TEMPERATURE (°C)
NCP2820 DFN
60
50
40
Class AB
30
20
Vp = 5 V
RL = 4 10
0.5
0.4
1
1.5
140
0.5
0.6
0.7
Class AB
120
100
Vp = 5 V
RL = 4 80
60
40
0
0
0.3
160
NCP2820 CSP
70
0.2
Figure 8. Die Temperature vs. P out
Vp = 3.6 V, RL = 8 , f = 1 kHz @ TA = +25°C
90
80
0.1
Pout (W)
Figure 5. Efficiency vs. P out
Vp = 3.6 V, RL = 8 , f = 1 kHz
EFFICIENCY %
0.2
20
2
NCP2820
0
Pout (W)
Figure 6. Efficiency vs. Pout
Vp = 5 V, RL = 4 , f = 1 kHz
0.5
1.0
Pout (W)
1.5
Figure 7. Die Temperature vs. Pout
Vp = 5 V, RL = 4 , f = 1 kHz @ TA = +25°C
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2.0
NCP2820
TYPICAL CHARACTERISTICS
100
90
NCP2820 CSP
80
DIE TEMPERATURE (°C)
70
EFFICIENCY %
90
NCP2820 DFN
60
50
40
Class AB
30
Vp = 3.6 V
RL = 4 20
10
0
0
0.2
0.4
0.6
0.8
1
Class AB
80
70
Vp = 3.6 V
RL = 4 60
50
40
NCP2820
30
20
1.2
0
0.2
10
THD+N (%)
Vp = 5.0 V
RL = 8 f = 1 kHz
1.0
NCP2820 DFN
0.1
1.0
Vp = 4.2 V
RL = 8 f = 1 kHz
NCP2820 DFN
0.1
NCP2820 CSP
NCP2820 CSP
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0.01
0
1.6
0.2
0.4
Pout (W)
0.8
1.0
1.2
Figure 12. THD+N vs. Pout
Vp = 4.2 V, RL = 8 , f = 1 kHz
10
10
Vp = 3.6 V
RL = 8 f = 1 kHz
1.0
THD+N (%)
THD+N (%)
0.6
Pout (W)
Figure 11. THD+N vs. Pout
Vp = 5 V, RL = 8 , f = 1 kHz
NCP2820 DFN
0.1
0.01
1.0
Figure 10. Die Temperature vs. Pout
Vp = 3.6 V, RL = 4 , f = 1 kHz @ TA = +25°C
10
0.01
0.8
Pout (W)
Figure 9. Efficiency vs. Pout
Vp = 3.6 V, RL = 4 , f = 1 kHz
THD+N (%)
0.6
0.4
Pout (W)
NCP2820 CSP
0
0.2
0.4
0.6
1.0
NCP2820 DFN
0.1
0.01
0
0.8
Vp = 3 V
RL = 8 f = 1 kHz
Pout (W)
NCP2820 CSP
0.1
0.2
0.3
0.4
Pout (W)
Figure 14. THD+N vs. Pout
Vp = 3 V, RL = 8 , f = 1 kHz
Figure 13. THD+N vs. Pout
Vp = 3.6 V, RL = 8 , f = 1 kHz
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9
0.5
0.6
NCP2820
TYPICAL CHARACTERISTICS
10
10
Vp = 5 V
RL = 4 f = 1 kHz
1.0
THD+N (%)
THD+N (%)
Vp = 2.5 V
RL = 8 f = 1 kHz
NCP2820 DFN
0.1
0.01
0
NCP2820 CSP
0.1
0.2
0.3
0.5
1.0
Figure 16. THD+N vs. Pout
Vp = 5 V, RL = 4 , f = 1 kHz
2.5
10
Vp = 4.2 V
RL = 4 f = 1 kHz
0.5
1.0
1.5
1.0
0.1
0.01
0
2.0
Vp = 3.6 V
RL = 4 f = 1 kHz
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Pout (W)
Figure 17. THD+N vs. Pout
Vp = 4.2 V, RL = 4 , f = 1 kHz
Figure 18. THD+N vs. Pout
Vp = 3.6 V, RL = 4 , f = 1 kHz
10
10
Vp = 2.5 V
RL = 4 f = 1 kHz
THD+N (%)
Vp = 3 V
RL = 4 f = 1 kHz
THD+N (%)
2.0
Figure 15. THD+N vs. Pout
Vp = 2.5 V, RL = 8 , f = 1 kHz
Pout (W)
1.0
0.1
0
1.5
Pout (W)
THD+N (%)
THD+N (%)
0
Pout (W)
0.1
0.01
0
0.1
0.01
0.4
10
1.0
1.0
0.2
0.4
0.6
0.8
1.0
1.0
0.1
0
Pout (W)
0.1
0.2
0.3
0.4
0.5
Pout (W)
Figure 20. THD+N vs. Power Out
Vp = 2.5 V, RL = 4 , f = 1 kHz
Figure 19. THD+N vs. Power Out
Vp = 3 V, RL = 4 , f = 1 kHz
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0.6
NCP2820
TYPICAL CHARACTERISTICS
2.0
3.0
RL = 8 f = 1 kHz
NCP2820 DFN
THD+N = 10%
2.0
NCP2820 CSP
THD+N = 10%
1.0
Pout (W)
Pout (W)
1.5
RL = 4 f = 1 kHz
2.5
THD+N = 10%
1.5
THD+N = 1%
1.0
0.5
NCP2820 CSP
THD+N = 1%
3.0
3.5
4.0
4.5
0.5
0
2.5
5.0
1.0
Vp = 2.5 V
Vp = 3.6 V
0.1
0.1
100
Vp = 5 V
1000
10000
100000
0.01
10
100
1000
10000
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 23. THD+N vs. Frequency
RL = 8 , Pout = 250 mW @ f = 1 kHz
Figure 24. THD+N vs. Frequency
RL = 4 , Pout = 250 mW @ f = 1 kHz
−20
−20
−30
−30
−40
−40
PSSR (dB)
PSSR (dB)
5.0
Vp = 3.6 V
Vp = 2.5 V
Vp = 5 V
Vp = 5 V
Inputs to GND
RL = 8 −70
100
1000
10000
Vp = 3.6 V
Inputs to GND
RL = 4 −70
100000
100000
Vp = 5 V
−50
−60
Vp = 3.6 V
−80
10
4.5
Figure 22. Output Power vs. Power Supply
RL = 4 @ f = 1 kHz
1.0
−60
4.0
Figure 21. Output Power vs. Power Supply
RL = 8 @ f = 1 kHz
10
−50
3.5
POWER SUPPLY (V)
10
0.01
10
3.0
POWER SUPPLY (V)
THD+N (%)
THD+N (%)
0
2.5
NCP2820 DFN
THD+N = 3%
−80
10
100
1000
10000
100000
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 25. PSRR vs. Frequency
Inputs Grounded, RL = 8 , Vripple = 200 mvpkpk
Figure 26. PSRR vs. Frequency
Inputs grounded, RL = 4 , Vripple = 200 mVpkpk
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NCP2820
−20
3.5
−30
3.0
QUIESCENT CURRENT (mA)
CMMR (dB)
TYPICAL CHARACTERISTICS
−40
−50
−60
Vp = 3.6 V
RL = 8 −70
−80
10
100
1000
10000
100000
2.5
2.0
Thermal Shutdown
Vp = 3.6 V
RL = 8 1.5
1.0
0.5
0
120
130
FREQUENCY (Hz)
160
Figure 28. Thermal Shutdown vs. Temperature
Vp = 5 V, RL = 8 ,
900
2.8
800
RL = 8 SHUTDOWN CURRENT (nA)
SHUTDOWN CURRENT (nA)
150
TEMPERATURE (°C)
Figure 27. PSRR vs. Frequency
Vp = 3.6 V, RL = 8 , Vic = 200 mvpkpk
700
600
500
400
300
200
100
0
2.5
3.5
4.5
2.6
RL = 8 2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
2.5
5.5
3.5
4.5
5.5
POWER SUPPLY (V)
POWER SUPPLY (V)
Figure 29. Shutdown Current vs. Power Supply
RL = 8 Figure 30. Quiescent Current vs. Power Supply
RL = 8 1000
1000
Vp = 5 V
RL = 8 100
NOISE (Vrms)
Vp = 3.6 V
RL = 8 NOISE (Vrms)
140
No Weighting
100
No Weighting
With A Weighting
10
10
100
With A Weighting
1000
10000
10
10
FREQUENCY (Hz)
100
1000
10000
FREQUENCY (Hz)
Figure 31. Noise Floor, Inputs AC Grounded
with 1 F Vp = 3.6 V
Figure 32. Noise Floor, Inputs AC Grounded
with 1 F Vp = 5 V
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NCP2820
8
11
9
TURN OFF TIME (mS)
TURN ON TIME (mS)
TA = +85°C
10
TA = +25°C
TA = −40°C
8
7
6
2.5
3.5
4.5
7
TA = +25°C
TA = −40°C
6
5
TA = +85°C
4
2.5
5.5
3.5
4.5
POWER SUPPLY (V)
POWER SUPPLY (V)
Figure 33. Turn on Time
Figure 34. Turn off Time
5.5
DESCRIPTION INFORMATION
Detailed Description
The basic structure of the NCP2820 is composed of one
analog pre−amplifier, a pulse width modulator and an
H−bridge CMOS power stage. The first stage is externally
configurable with gain−setting resistor Ri and the internal
fixed feedback resistor Rf (the closed−loop gain is fixed by
the ratios of these resistors) and the other stage is fixed. The
load is driven differentially through two output stages.
The differential PWM output signal is a digital image of
the analog audio input signal. The human ear is a band pass
filter regarding acoustic waveforms, the typical values of
which are 20 Hz and 20 kHz. Thus, the user will hear only
the amplified audio input signal within the frequency range.
The switching frequency and its harmonics are fully filtered.
The inductive parasitic element of the loudspeaker helps to
guarantee a superior distortion value.
The device has the same behavior when it is turned−off by
a logic low on the shutdown pin. No power is delivered to the
load 5 ms after a falling edge on the shutdown pin. Due to
the fast turn on and off times, the shutdown signal can be
used as a mute signal as well.
Power Amplifier
Current Breaker Circuit
Turn On and Turn Off Transitions in Case of UDFN8
In case of UDFN8 package, the audio signal is established
instantaneously after the rising edge on the shutdown pin.
The audio is also suddenly cut once a low level is sent to the
amplifier. This way to turn on and off the device in a very fast
way also prevents from “pop & click” noise.
Shutdown Function
The device enters shutdown mode when the shutdown
signal is low. During the shutdown mode, the DC quiescent
current of the circuit does not exceed 1.5 A.
The maximum output power of the circuit corresponds to
an average current in the load of 820 mA.
In order to limit the excessive power dissipation in the
load if a short−circuit occurs, a current breaker cell shuts
down the output stage. The current in the four output MOS
transistors are real−time controlled, and if one current
exceeds the threshold set to 1.5 A, the MOS transistor is
opened and the current is reduced to zero. As soon as the
short−circuit is removed, the circuit is able to deliver the
expected output power.
This patented structure protects the NCP2820. Since it
completely turns off the load, it minimizes the risk of the
chip overheating which could occur if a soft current limiting
circuit was used.
The output PMOS and NMOS transistors of the amplifier
have been designed to deliver the output power of the
specifications without clipping. The channel resistance
(Ron) of the NMOS and PMOS transistors is typically 0.4.
Turn On and Turn Off Transitions in Case of 9 Pin
Flip−Chip Package
In order to eliminate “pop and click” noises during
transition, the output power in the load must not be
established or cutoff suddenly. When a logic high is applied
to the shutdown pin, the internal biasing voltage rises
quickly and, 4 ms later, once the output DC level is around
the common mode voltage, the gain is established slowly
(5.0 ms). This method to turn on the device is optimized in
terms of rejection of “pop and click” noises. Thus, the total
turn on time to get full power to the load is 9 ms (typical).
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NCP2820
APPLICATION INFORMATION
NCP2820 PWM Modulation Scheme
is applied, OUTP duty cycle is greater than 50% and OUTM
is less than 50%. With this configuration, the current through
the load is 0 A most of the switching period and thus power
losses in the load are lowered.
The NCP2820 uses a PWM modulation scheme with each
output switching from 0 to the supply voltage. If Vin = 0 V
outputs OUTM and OUTP are in phase and no current is
flowing through the differential load. When a positive signal
OUTP
OUTM
+Vp
0V
−Vp
Load Current
0A
Figure 35. Output Voltage and Current Waveforms into an Inductive Loudspeaker
DC Output Positive Voltage Configuration
Voltage Gain
An optional filter can be used for filtering high frequency
signal before the speaker. In this case, the circuit consists of
two inductors (15 H) and two capacitors (2.2 F)
(Figure 36). The size of the inductors is linked to the output
power requested by the application. A simplified version of
this filter requires a 1 F capacitor in parallel with the load,
instead of two 2.2 F connected to ground (Figure 37).
Cellular phones and portable electronic devices are great
applications for Filterless Class−D as the track length
between the amplifier and the speaker is short, thus, there is
usually no need for an EMI filter. However, to lower radiated
emissions as much as possible when used in filterless mode,
a ferrite filter can often be used. Select a ferrite bead with the
high impedance around 100 MHz and a very low DCR value
in the audio frequency range is the best choice. The
MPZ1608S221A1 from TDK is a good choice. The package
size is 0603.
The first stage is an analog amplifier. The second stage is
a comparator: the output of the first stage is compared with
a periodic ramp signal. The output comparator gives a pulse
width modulation signal (PWM). The third and last stage is
the direct conversion of the PWM signal with MOS
transistors H−bridge into a powerful output signal with low
impedance capability.
With an 8 load, the total gain of the device is typically
set to:
300 k
Ri
Input Capacitor Selection (Cin)
The input coupling capacitor blocks the DC voltage at the
amplifier input terminal. This capacitor creates a high−pass
filter with Rin, the cut−off frequency is given by
Fc +
2
1
Ri
Ci
.
Optimum Equivalent Capacitance at Output Stage
When using an input resistor set to 150 k, the gain
configuration is 2 V/V. In such a case, the input capacitor
selection can be from 10 nF to 1 F with cutoff frequency
values between 1 Hz and 100 Hz. The NCP2820 also
includes a built in low pass filtering function. It’s cut off
frequency is set to 20 kHz.
If the optional filter described in the above section isn’t
selected. Cellular phones and wireless portable devices
design normally put several Radio Frequency filtering
capacitors and ESD protection devices between Filter less
Class D outputs and loudspeaker. Those devices are usually
connected between amplifier output and ground. In order to
achieve the best sound quality, the optimum value of total
equivalent capacitance between each output terminal to the
ground should be less than or equal to 150 pF. This total
equivalent capacitance consists of the radio frequency
filtering capacitors and ESD protection device equivalent
parasitic capacitance.
Optional Output Filter
This filter is optional due to the capability of the speaker
to filter by itself the high frequency signal. Nevertheless, the
high frequency is not audible and filtered by the human ear.
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NCP2820
15 H
15 H
OUTM
RL = 8 2.2 F
1.0 F
RL = 8 OUTM
OUTP
2.2 F
OUTP
15 H
15 H
Figure 36. Advanced Optional Audio Output Filter
Figure 37. Optional Audio Output Filter
RL = 8 OUTM
FERRITE
CHIP BEADS
OUTP
Figure 38. Optional EMI Ferrite Bead Filter
Cs
VP
Ri
Differential
Audio Input
from DAC
INP
Ri
OUTM
INM
OUTP
SD
Input from
Microcontroller
GND
Figure 39. NCP2820 Application Schematic with Fully Differential Input Configuration
Cs
Differential
Audio Input
from DAC
Input from
Microcontroller
Ri
Ri
VP
INP
OUTM
INM
OUTP
SD
FERRITE
CHIP BEADS
GND
Figure 40. NCP2820 Application Schematic with Fully Differential Input Configuration and
Ferrite Chip Beads as an Output EMI Filter
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15
NCP2820
Cs
Ci
VP
Ri
Differential
Audio Input
from DAC
INP
Ri
OUTM
INM
Ci
OUTP
SD
Input from
Microcontroller
FERRITE
CHIP BEADS
GND
Figure 41. NCP2820 Application Schematic with Differential Input Configuration and
High Pass Filtering Function
Cs
Ci
Single−Ended Audio Input
from DAC
VP
Ri
INP
Ri
OUTM
INM
Ci
OUTP
SD
Input from
Microcontroller
GND
Figure 42. NCP2820 Application Schematic with Single Ended Input Configuration
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NCP2820
Vp
J1
C3*
C4*
4.7 F
U1
J7
R1
INP
100 nF 150 k
Rf
OUTM
A1
A3
RAMP
GENERATOR
C2
R2
INM
100 nF
150 k
C1
Data
Processor
J3
CMOS
Output
Stage
RL = 8 C1
J2
B1, B2
Vp
OUTP
Rf
C3
300 k
J8
SD
Shutdown
Control
GND
A2, B3
C2
Vp
*J6 not Mounted
*C3 not Mounted in case of 9 Pin Flip−Chip Evaluation Board
*C4 not Defined in case of UDFN8 Evaluation Board.
J5
J6*
CL = NCP2820 ON
J4
J5
CL = NCP2820 OFF
Figure 43. Schematic of the Demonstration Board of the 9−pin Flip Chip CSP Device
Figure 44. Silkscreen Layer of the 9 Pin Flip−Chip Evaluation Board
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NCP2820
Figure 45. Silkscreen Layer of the UDFN8 Evaluation Board
PCB Layout Information
A 1.0 F low ESR ceramic capacitor can also be used with
slightly degraded performances on the THD+N from 0.06%
up to 0.2%.
In a two layers application, if both Vp pins are connected
on the top layer, a single 4.7 F decoupling capacitor will
optimize the THD+N level.
The NCP2820 power audio amplifier can operate from
2.5 V until 5.5 V power supply. With less than 2% THD+N,
it delivers 500 mW rms output power to a 8.0 load at
Vp =3.0 V and 1.0 W rms output power at Vp = 4.0 V.
NCP2820 is suitable for low cost solution. In a very small
package it gives all the advantages of a Class−D audio
amplifier. The required application board is focused on low
cost solution too. Due to its fully differential capability, the
audio signal can only be provided by an input resistor. If a
low pass filtering function is required, then an input
coupling capacitor is needed. The values of these
components determine the voltage gain and the bandwidth
frequency. The battery positive supply voltage requires a
good decoupling capacitor versus the expected distortion.
When the board is using Ground and Power planes with
at least 4 layers, a single 4.7 F filtering ceramic capacitor
on the bottom face will give optimized performance.
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18
NCP2820
Note
Figure 46. Top Layer of Two Layers Board Dedicated to the 9−Pin Flip−Chip Package
Note: This track between Vp pins is only needed when a 2 layers board is used. In case of a typical
4 or more layers, the use of laser vias in pad will optimize the THD+N floor. The demonstration
board delivered by ON Semiconductor is a 4 Layers with Top, Ground, Power Supply and Bottom.
Bill of Materials
PCB
Footprint
Manufacturer
Part Number
R1, R2
0603
Vishay−Draloric
CRCW0603
Ceramic Capacitor 100 nF, 50 V, X7R
C1, C2
0603
TDK
C1608X7R1H104KT
4
Ceramic Capacitor 4.7 F, 6.3 V, X5R
C3, C4
0603
TDK
C1608X5R0J475MT
5
PCB Footprint
J7, J8
6
I/O connector. It can be plugged by
MC−1,5/3−ST−3,81
J2
Phoenix Contact
MC−1,5/3−G
7
I/O connector. It can be plugged by
BLZ5.08/2 (Weidmuller Reference)
J1, J3
Weidmuller
SL5.08/2/90B
8
Jumper Connector, 400 mils
J4
Harwin
D3082−B01
9
Jumper Header Vertical Mount
3*1, 2.54 mm.
J5
Tyco Electronics / AMP
5−826629−0
Item
Part Description
Ref
1
NCP2820 Audio Amplifier
U1
2
SMD Resistor 150 k
3
NCP2820
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19
NCP2820
ORDERING INFORMATION
Device
Marking
Package
Shipping†
NCP2820FCT1
MAQ
9−Pin Flip−Chip CSP
3000 / Tape & Reel
NCP2820FCT1G
MAQG
9−Pin Flip−Chip CSP
(Pb−Free)
3000 / Tape & Reel
T1 Orientation
NCP2820FCT2G
MAQG
9−Pin Flip−Chip CSP
(Pb−Free)
3000 / Tape & Reel
T2 Orientation
NCP2820MUTBG
ZBMG
8 PIN UDFN 2x2.2
(Pb−Free)
3000 / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
T1 Orientation
T2 Orientation
Pin 1 (Upper Right)
Pin 1 (Upper Left)
Die orientation in tape with bumps down
Die orientation in tape with bumps down
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NCP2820
PACKAGE DIMENSIONS
9 PIN FLIP−CHIP
CASE 499AL−01
ISSUE O
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. COPLANARITY APPLIES TO SPHERICAL
CROWNS OF SOLDER BALLS.
−A−
4X
D
0.10 C
−B−
DIM
A
A1
A2
D
E
b
e
D1
E1
E
TOP VIEW
A
0.10 C
0.05 C
−C−
A2
A1
SIDE VIEW
SEATING
PLANE
D1
e
C
B
e
A
9X
b
1
2
E1
3
0.05 C A B
0.03 C
BOTTOM VIEW
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MILLIMETERS
MIN
MAX
0.540
0.660
0.210
0.270
0.330
0.390
1.450 BSC
1.450 BSC
0.290
0.340
0.500 BSC
1.000 BSC
1.000 BSC
NCP2820
PACKAGE DIMENSIONS
8 PIN UDFN, 2x2.2, 0.5P
CASE 506AV−01
ISSUE B
PIN ONE
REFERENCE
2X
0.10 C
ÉÉ
ÉÉ
ÉÉ
E
DIM
A
A1
A3
b
D
D2
E
E2
e
K
L
TOP VIEW
0.10 C
2X
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. DIMENSION b APPLIES TO PLATED TERMINAL
AND IS MEASURED BETWEEN 0.25 AND
0.30 mm FROM TERMINAL.
4. COPLANARITY APPLIES TO THE EXPOSED
PAD AS WELL AS THE TERMINALS.
A B
D
(A3)
A
0.10 C
8X
0.08 C
SEATING
PLANE
SIDE VIEW
C
A1
SOLDERING FOOTPRINT*
D2
8X
L
4
1
2.15
e
1
E2
8X
K
8
5
MILLIMETERS
MIN
NOM MAX
0.45
0.50
0.55
0.00
0.03
0.05
0.127 REF
0.20
0.25
0.30
2.00 BSC
1.40
1.50
1.60
2.20 BSC
0.70
0.80
0.90
0.50 BSC
0.20
−−−
−−−
0.35
0.40
0.45
1.60
8X b
BOTTOM VIEW
0.10 C A B
0.05 C
NOTE 3
ÇÇ
ÇÇ
ÇÇ
ÇÇ
ÇÇ
ÇÇ
ÇÇÇ
ÇÇÇ
ÇÇÇ
ÇÇÇ
ÇÇÇ
ÇÇÇ
8X
0.48
0.80
8X
0.25
0.50
PITCH
DIMENSIONS: MILLIMETERS
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada
Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada
Email: [email protected]
N. American Technical Support: 800−282−9855 Toll Free
USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: 421 33 790 2910
Japan Customer Focus Center
Phone: 81−3−5773−3850
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22
ON Semiconductor Website: www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative
NCP2820/D