NCP2820AFCT2G_技术文档

NCP2820

2.65 W Filterless Class−D

Audio Power Amplifier

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

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MARKING

DIAGRAMS

A3

A1

1

9−PIN FLIP−CHIP CSP

1

FC SUFFIX

CASE 499AL

C1

8

1

ZB MG

1

42ꢁ ꢂV noise floor, A−weighted, a clean listening is guaranteed no

matter the load sensitivity.

8 PIN UDFN 2x2.2

MU SUFFIX

Features

CASE 506AV

• Optimized PWM Output Stage: Filterless Capability

• Efficiency up to 90%

A

Y

= Assembly Location

= Year

Low 2.5 mA Typical Quiescent Current

• Large Output Power Capability: 1.4 W with 8.0 ꢀ Load (CSP) and

THD + N < 1%

WW = Work Week

M

G

= Date Code

= Pb−Free Package

• Wide Supply Voltage Range: 2.5−5.5 V Operating Voltage

• High Performance, THD+N of 0.03% @ V = 5.0 V,

p

R = 8.0 ꢀ, P = 100 mW

L

out

• 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

ORDERING INFORMATION

See detailed ordering and shipping information on page 20 of

this data sheet.

• Very Fast Turn On/Off Times with Advanced Rising and Falling

Cs

Gain Technique

• External Gain Configuration Capability

• Internally Generated 250 kHz Switching Frequency

VP

Audio

Input

from

R

i

INP

INM

OUTM

OUTP

• Short Circuit Protection Circuitry

DAC

• “Pop and Click” Noise Protection Circuitry

• Pb−Free Packages are Available

SD

Input from

Microcontroller

Applications

• Cellular Phone

GND

• Portable Electronic Devices

• PDAs and Smart Phones

• Portable Computer

Cs

R

i

1.6 mm

3.7 mm

1

Publication Order Number:

November, 2006 − Rev. 5

NCP2820/D

NCP2820

PIN CONNECTIONS

9−Pin Flip−Chip CSP

UDFN8

OUTM

GND

1

2

3

4

8

7

6

5

SD

VP

A1

A2

A3

INP

GND

OUTM

B1

VP

B2

VP

B3

GND

C3

INP

INM

VP

OUTP

C1

C2

(Top View)

INM

SD

OUTP

(Top View)

BATTERY

Cs

V

p

R

i

f

INM

OUTP

RAMP

GENERATOR

Data

Processor

CMOS

Output

Stage

Negative

Differential

Input

OUTM

R

f

i

INP

300 kꢀ

Shutdown

Control

Positive

Differential

Input

GND

SD

V

ih

V

il

Figure 1. Typical Application

PIN DESCRIPTION

Pin No.

CSP

A1

A2

A3

B1

B2

B3

C1

C2

UDFN8

Symbol

INP

Type

Description

3

7

8

2

6

7

4

1

I

Positive Differential Input.

Analog Ground.

GND

OUTM

O

I

Negative BTL Output.

V

p

V

p

Analog Positive Supply. Range: 2.5 V – 5.5 V.

I

Power Analog Positive Supply. Range: 2.5 V – 5.5 V.

Analog Ground.

GND

INM

SD

I

Negative Differential Input.

I

The device enters in Shutdown Mode when a low level is applied on this pin. An internal

300 kꢀ 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.

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2

NCP2820

MAXIMUM RATINGS

Symbol

Rating

Max

Unit

V

p

Supply Voltage

Active Mode

Shutdown Mode

6.0

7.0

V

Input Voltage

−0.3 to V +0.3

V

A

in

CC

I

Max Output Current (Note 1)

Power Dissipation (Note 2)

Operating Ambient Temperature

Max Junction Temperature

Storage Temperature Range

1.5

Internally Limited

−40 to +85

150

out

P

−

d

T

A

°C

°C/W

T

J

T

stg

−65 to +150

R

Thermal Resistance Junction−to−Air

9−Pin Flip−Chip

90 (Note 3)

50

ꢃ

JA

UDFN8

ESD Protection

−

> 2000

> 200

V

Human Body Model (HBM) (Note 4)

Machine Model (MM) (Note 5)

−

Latchup Current @ T = 85°C (Note 6)

9−Pin Flip−Chip

$70

mA

A

UDFN8

$100

MSL

Moisture Sensitivity (Note 7)

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 R

is highly dependent of the PCB Heatsink area. For example, R

can equal 195°C/W with

JA

ꢃ

JA

2

50 mm total area and also 135°C/W with 500 mm . 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 kꢀ resistor following specification JESD22/A114. On 9−Pin Flip−Chip, B2 Pin (V )

P

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 T = +25°C unless otherwise noted) (NCP2820FCT1G and NCP2820FCT2G)

A

Characteristic

Operating Supply Voltage

Supply Quiescent Current

Symbol

Conditions

T = −40°C to +85°C

Min

Typ

Max

Unit

V

p

2.5

−

5.5

A

I

dd

V = 3.6 V, R = 8.0 ꢀ

−

2.15

2.61

−

mA

p

L

V = 5.5 V, No Load

p

V from 2.5 V to 5.5 V, No Load

p

T = −40°C to +85°C

A

−

4.6

Shutdown Current

I

sd

V = 4.2 V

ꢂ A

p

T = +25°C

−

0.42

0.45

0.8

−

A

T = +85°C

A

V = 5.5 V

p

T = +25°C

T = +85°C

A

−

0.8

0.9

1.5

−

A

Shutdown Voltage High

Shutdown Voltage Low

Switching Frequency

V

ꢄ

1.2

−

V

sdih

V

0.4

310

sdil

F

V from 2.5 V to 5.5 V

190

250

kHz

sw

p

T = −40°C to +85°C

A

Gain

G

R = 8.0 ꢀ

L

285 kꢀ 300 kꢀ 315 kꢀ

V

R

i

Output Impedance in Shutdown Mode

Resistance from SD to GND

Output Offset Voltage

Z

ꢄ

−

300

6.0

9.0

5.0

160

−

ꢀ

kꢀ

SD

Rs

Vos

Ton

Toff

Tsd

Vn

−

V = 5.5 V

mV

ms

p

Turn On Time

V from 2.5 V to 5.5 V

p

Turn Off Time

V from 2.5 V to 5.5 V

ms

p

Thermal Shutdown Temperature

Output Noise Voltage

−

°C

V = 3.6 V, f = 20 Hz to 20 kHz

ꢂ Vrms

p

no weighting filter

with A weighting filter

−

65

42

−

RMS Output Power

Po

W

R = 8.0 ꢀ, f = 1.0 kHz, THD+N < 1%

L

V = 2.5 V

−

0.32

0.48

0.7

0.97

1.38

−

p

V = 3.0 V

p

V = 3.6 V

p

V = 4.2 V

p

V = 5.0 V

p

R = 8.0 ꢀ, f = 1.0 kHz, THD+N < 10%

L

V = 2.5 V

−

0.4

0.59

0.87

1.19

1.7

−

p

V = 3.0 V

p

V = 3.6 V

p

V = 4.2 V

p

V = 5.0 V

p

R = 4.0 ꢀ, f = 1.0 kHz, THD+N < 1%

L

V = 2.5 V

−

0.49

0.72

1.06

1.62

2.12

−

p

V = 3.0 V

p

V = 3.6 V

p

V = 4.2 V

p

V = 5.0 V

p

R = 4.0 ꢀ, f = 1.0 kHz, THD+N < 10%

L

V = 2.5 V

−

0.6

0.9

1.33

2.0

2.63

−

p

V = 3.0 V

p

V = 3.6 V

p

V = 4.2 V

p

V = 5.0 V

p

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4

NCP2820

ELECTRICAL CHARACTERISTICS (Limits apply for T = +25°C unless otherwise noted) (NCP2820FCT1G and NCP2820FCT2G)

A

Characteristic

Symbol

Conditions

Min

Typ

Max

Unit

Efficiency

−

%

R = 8.0 ꢀ, f = 1.0 kHz

L

V = 5.0 V, P = 1.2 W

−

91

90

−

p

out

V = 3.6 V, P = 0.6 W

p

out

R = 4.0 ꢀ, f = 1.0 kHz

L

V = 5.0 V, P = 2.0 W

−

82

81

−

p

out

V = 3.6 V, P = 1.0 W

p

out

Total Harmonic Distortion + Noise

Common Mode Rejection Ratio

THD+N

CMRR

V = 5.0 V, R = 8.0 ꢀ,

%

p

L

f = 1.0 kHz, P = 0.25 W

−

0.05

0.09

−

out

V = 3.6 V, R = 8.0 ꢀ,

p

L

f = 1.0 kHz, P = 0.25 W

out

V from 2.5 V to 5.5 V

p

dB

V

ic

= 0.5 V to V − 0.8 V

−

−62

−

p

V = 3.6 V, V = 1.0 V

p

ic

pp

f = 217 Hz

f = 1.0 kHz

−

−56

−57

−

Power Supply Rejection Ratio

PSRR

V

= 200 mV, R = 8.0 ꢀ,

dB

p_ripple_pk−pk

L

Inputs AC Grounded

V = 3.6 V

p

f = 217 kHz

f = 1.0 kHz

−

−62

−65

−

ELECTRICAL CHARACTERISTICS (Limits apply for T = +25°C unless otherwise noted) (NCP2820MUTBG)

A

Characteristic

Operating Supply Voltage

Supply Quiescent Current

Symbol

Conditions

T = −40°C to +85°C

Min

Typ

Max

Unit

V

p

2.5

−

5.5

A

I

dd

V = 3.6 V, R = 8.0 ꢀ

−

2.15

2.61

−

mA

p

L

V = 5.5 V, No Load

p

V from 2.5 V to 5.5 V, No Load

p

T = −40°C to +85°C

A

−

3.8

Shutdown Current

I

sd

V = 4.2 V

ꢂ A

p

T = +25°C

−

0.42

0.45

0.8

2.0

A

T = +85°C

A

V = 5.5 V

p

T = +25°C

T = +85°C

A

−

0.8

0.9

1.5

−

A

Shutdown Voltage High

Shutdown Voltage Low

Switching Frequency

V

ꢄ

1.2

−

V

sdih

V

0.4

300

sdil

F

V from 2.5 V to 5.5 V

180

240

kHz

sw

p

T = −40°C to +85°C

A

Gain

G

R = 8.0 ꢀ

L

285 kꢀ 300 kꢀ 315 kꢀ

V

R

i

Output Impedance in Shutdown Mode

Resistance from SD to GND

Output Offset Voltage

Z

ꢄ

−

20

300

6.0

1.0

160

−

kꢀ

SD

Rs

Vos

Ton

Toff

Tsd

Vn

−

V = 5.5 V

mV

ꢂ s

p

Turn On Time

V from 2.5 V to 5.5 V

p

Turn Off Time

V from 2.5 V to 5.5 V

ꢂ

s

p

Thermal Shutdown Temperature

Output Noise Voltage

−

°C

V = 3.6 V, f = 20 Hz to 20 kHz

ꢂ

V

r

m

s

p

no weighting filter

with A weighting filter

−

65

42

−

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5

NCP2820

ELECTRICAL CHARACTERISTICS (Limits apply for T = +25°C unless otherwise noted) (NCP2820MUTBG)

A

Characteristic

RMS Output Power

Symbol

Conditions

Min

Typ

Max

Unit

Po

W

R = 8.0 ꢀ, f = 1.0 kHz, THD+N < 1%

L

V = 2.5 V

−

0.22

0.33

0.45

0.67

0.92

−

p

V = 3.0 V

p

V = 3.6 V

p

V = 4.2 V

p

V = 5.0 V

p

R = 8.0 ꢀ, f = 1.0 kHz, THD+N < 10%

W

%

L

V = 2.5 V

−

0.36

0.53

0.76

1.07

1.49

−

p

V = 3.0 V

p

V = 3.6 V

p

V = 4.2 V

p

V = 5.0 V

p

R = 4.0 ꢀ, f = 1.0 kHz, THD+N < 1%

L

V = 2.5 V

−

0.24

0.38

0.57

0.83

1.2

−

p

V = 3.0 V

p

V = 3.6 V

p

V = 4.2 V

p

V = 5.0 V

p

R = 4.0 ꢀ, f = 1.0 kHz, THD+N < 10%

L

V = 2.5 V

−

0.52

0.8

1.125

1.58

2.19

−

p

V = 3.0 V

p

V = 3.6 V

p

V = 4.2 V

p

V = 5.0 V

p

Efficiency

−

R = 8.0 ꢀ, f = 1.0 kHz

L

V = 5.0 V, P = 1.2 W

−

87

−

p

out

V = 3.6 V, P = 0.6 W

p

out

R = 4.0 ꢀ, f = 1.0 kHz

L

V = 5.0 V, P = 2.0 W

−

79

78

−

p

out

V = 3.6 V, P = 1.0 W

p

out

Total Harmonic Distortion + Noise

Common Mode Rejection Ratio

THD+N

CMRR

V = 5.0 V, R = 8.0 ꢀ,

%

p

L

f = 1.0 kHz, P = 0.25 W

−

0.05

0.06

−

out

V = 3.6 V, R = 8.0 ꢀ,

p

L

f = 1.0 kHz, P = 0.25 W

out

V from 2.5 V to 5.5 V

p

dB

V

ic

= 0.5 V to V − 0.8 V

−

−62

−

p

V = 3.6 V, V = 1.0 V

p

ic

pp

f = 217 Hz

f = 1.0 kHz

−

−56

−57

−

Power Supply Rejection Ratio

PSRR

V

= 200 mV, R = 8.0 ꢀ,

dB

p_ripple_pk−pk

L

Inputs AC Grounded

V = 3.6 V

p

f = 217 kHz

f = 1.0 kHz

−

−62

−65

−

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6

NCP2820

C

R

i

+

INP

OUTM

30 kHz

Low Pass

Filter

Audio Input

Signal

Measurement

Input

Load

−

INM

OUTP

GND

VP

4.7 ꢂ F

+

Power

Supply

−

Figure 2. Test Setup for Graphs

NOTES:

1. Unless otherwise noted, C = 100 nF and R = 150 kꢀ. Thus, the gain setting is 2 V/V and the cutoff frequency of the

i

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:

R = 8 ꢀ means Load = 15 ꢂ H + 8 ꢀ + 15 ꢂ H

L

R = 4 ꢀ means Load = 15 ꢂ H + 4 ꢀ + 15 ꢂ H

L

Very low DCR 15 ꢂ H inductors (50 mꢀ) 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

90

80

70

60

50

40

100

90

80

70

60

NCP2820 CSP

Class AB

NCP2820 ꢂ DFN

V = 5 V

R = 8 ꢀ

L

p

50

40

30

20

10

0

Class AB

V = 5 V

R = 8 ꢀ

L

p

30

20

NCP2820

0

0.2

0.4

0.6

0.8

(W)

1.0

1.2

1.4

0

0.2

0.4

0.6

(W)

0.8

1

P

out

P

out

Figure 3. Efficiency vs. P_out

Figure 4. Die Temperature vs. P_out

V_p= 5 V, R_L= 8 ꢀ, f = 1 kHz

V_p= 5 V, R_L= 8 ꢀ, f = 1 kHz @ T_A= +25°C

60

55

50

45

40

35

30

25

20

100

90

80

70

60

50

40

30

20

10

0

NCP2820 CSP

NCP2820 ꢂ DFN

Class AB

V = 3.6 V

R = 8 ꢀ

L

p

Class AB

V = 3.6 V

R = 8 ꢀ

L

p

NCP2820

0

0.1

0.2

0.3

0.4

(W)

0.5

0.6

0.7

0

0.1

0.2

0.3

P

0.4

(W)

0.5

0.6

0.7

P

out

Figure 5. Efficiency vs. P _out

Figure 8. Die Temperature vs. P _out

V_p= 3.6 V, R_L= 8 ꢀ, f = 1 kHz

V_p= 3.6 V, R_L= 8 ꢀ, f = 1 kHz @ T_A= +25°C

90

80

70

60

50

40

30

20

10

0

160

140

120

100

80

NCP2820 CSP

NCP2820 ꢂ DFN

Class AB

V = 5 V

R = 4 ꢀ

L

p

Class AB

60

V = 5 V

R = 4 ꢀ

p

40

NCP2820

L

20

0

0.5

1

1.5

2

0

0.5

1.0

(W)

1.5

2.0

P

(W)

P

out

Figure 6. Efficiency vs. P_out

Figure 7. Die Temperature vs. P_out

V_p= 5 V, R_L= 4 ꢀ, f = 1 kHz

V_p= 5 V, R_L= 4 ꢀ, f = 1 kHz @ T_A= +25°C

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NCP2820

TYPICAL CHARACTERISTICS

100

90

80

70

60

50

90

80

70

60

50

40

30

20

10

0

NCP2820 CSP

NCP2820 ꢂ DFN

Class AB

V = 3.6 V

R = 4 ꢀ

L

p

Class AB

40

30

20

V = 3.6 V

R = 4 ꢀ

L

p

NCP2820

0

0.2

0.4

0.6

(W)

0.8

1

1.2

0

0.2

0.4

0.6

(W)

0.8

1.0

P

out

Figure 10. Die Temperature vs. P_out

V_p= 3.6 V, R_L= 4 ꢀ, f = 1 kHz @ T_A= +25°C

Figure 9. Efficiency vs. P_out

V_p= 3.6 V, R_L= 4 ꢀ, f = 1 kHz

10

1.0

10

1.0

V = 5.0 V

V = 4.2 V

p

R = 8 ꢀ

L

f = 1 kHz

NCP2820 ꢂ DFN

0.1

NCP2820 CSP

0.01

0

0.2

0.4

0.6

0.8

1.0

(W)

1.2

1.4

1.6

0

0.2

0.4

0.6

(W)

0.8

1.0

1.2

P

out

P

out

Figure 12. THD+N vs. P_out

V_p= 4.2 V, R_L= 8 ꢀ, f = 1 kHz

Figure 11. THD+N vs. P_out

V_p= 5 V, R_L= 8 ꢀ, f = 1 kHz

10

1.0

10

1.0

V = 3.6 V

V = 3 V

p

R = 8 ꢀ

L

f = 1 kHz

NCP2820 ꢂ DFN

0.1

NCP2820 CSP

0.01

0

0.2

0.4

0.6

0.8

0

0.1

0.2

0.3

(W)

0.4

0.5

0.6

P

out

(W)

P

out

Figure 14. THD+N vs. P_out

V_p= 3 V, R_L= 8 ꢀ, f = 1 kHz

Figure 13. THD+N vs. P_out

V_p= 3.6 V, R_L= 8 ꢀ, f = 1 kHz

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9

NCP2820

TYPICAL CHARACTERISTICS

10

1.0

10

V = 2.5 V

p

V = 5 V

p

R = 8 ꢀ

L

R = 4 ꢀ

L

f = 1 kHz

1.0

0.1

NCP2820 ꢂ DFN

0.1

NCP2820 CSP

0.01

0

0.1

0.2

(W)

0.3

0.4

2.0

1.0

0

0.5

1.0

1.5

(W)

2.0

2.5

1.4

0.6

P

out

P

out

Figure 15. THD+N vs. Pout

V_p= 2.5 V, R_L= 8 ꢀ, f = 1 kHz

Figure 16. THD+N vs. Pout

V_p= 5 V, R_L= 4 ꢀ, f = 1 kHz

10

1.0

10

1.0

V = 4.2 V

R = 4 ꢀ

f = 1 kHz

V = 3.6 V

p

R = 4 ꢀ

f = 1 kHz

p

L

0.1

0.01

0.5

1.0

(W)

1.5

0

0.2

0.4

0.6

P

0.8

1.0

1.2

P

(W)

out

Figure 17. THD+N vs. Pout

V_p= 4.2 V, R_L= 4 ꢀ, f = 1 kHz

Figure 18. THD+N vs. Pout

V_p= 3.6 V, R_L= 4 ꢀ, f = 1 kHz

10

V = 3 V

R = 4 ꢀ

f = 1 kHz

V = 2.5 V

p

R = 4 ꢀ

f = 1 kHz

p

L

1.0

0.1

1.0

0.1

0

0.2

0.4

0.6

0.8

0.1

0.2

0.3

0.4

0.5

P

out

(W)

P

out

(W)

Figure 20. THD+N vs. Power Out

Figure 19. THD+N vs. Power Out

V_p= 2.5 V, R_L= 4 ꢀ, f = 1 kHz

V_p= 3 V, R_L= 4 ꢀ, f = 1 kHz

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10

NCP2820

TYPICAL CHARACTERISTICS

2.0

1.5

1.0

0.5

0

3.0

R = 8 ꢀ

f = 1 kHz

R = 4 ꢀ

f = 1 kHz

L

2.5

2.0

1.5

1.0

0.5

0

NCP2820 ꢂ DFN

THD+N = 10%

NCP2820 CSP

THD+N = 10%

THD+N = 1%

NCP2820 ꢂ DFN

THD+N = 3%

NCP2820 CSP

THD+N = 1%

2.5

3.0

3.5

4.0

4.5

5.0

2.5

3.0

3.5

4.0

4.5

5.0

POWER SUPPLY (V)

Figure 21. Output Power vs. Power Supply

Figure 22. Output Power vs. Power Supply

R_L= 8 ꢀ @ f = 1 kHz

R_L= 4 ꢀ @ f = 1 kHz

10

1.0

10

1.0

V = 3.6 V

p

V = 2.5 V

p

V = 2.5 V

p

V = 3.6 V

p

0.1

V = 5 V

p

V = 5 V

p

0.01

10

100

1000

FREQUENCY (Hz)

10000

100000

10

100

1000

10000

100000

FREQUENCY (Hz)

Figure 23. THD+N vs. Frequency

Figure 24. THD+N vs. Frequency

R_L= 8 ꢀ, P_out= 250 mW @ f = 1 kHz

R_L= 4 ꢀ, P_out= 250 mW @ f = 1 kHz

−20

−30

−40

−50

−60

−70

−80

−20

−30

−40

−50

−60

−70

−80

V = 5 V

p

V = 3.6 V

p

Inputs to GND

R = 8 ꢀ

Inputs to GND

R = 4 ꢀ

L

10

100

1000

10000

100000

10

100

1000

10000

100000

FREQUENCY (Hz)

Figure 25. PSRR vs. Frequency

Inputs Grounded, R_L= 8 ꢀ, Vripple = 200 mvpkpk

Figure 26. PSRR vs. Frequency

Inputs grounded, R_L= 4 ꢀ, Vripple = 200 mVpkpk

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11

NCP2820

TYPICAL CHARACTERISTICS

−20

−30

−40

−50

−60

−70

−80

3.5

3.0

2.5

2.0

1.5

1.0

Thermal Shutdown

V = 3.6 V

p

R = 8 ꢀ

L

V = 3.6 V

R = 8 ꢀ

L

p

0.5

0

10

100

1000

10000

100000

120

130

140

TEMPERATURE (°C)

150

160

FREQUENCY (Hz)

Figure 27. PSRR vs. Frequency

Figure 28. Thermal Shutdown vs. Temperature

V_p= 3.6 V, R_L= 8 ꢀ, Vic = 200 mvpkpk

V_p= 5 V, R_L= 8 ꢀ,

900

800

700

600

500

400

300

200

100

0

2.8

2.6

2.4

2.2

2.0

1.8

1.6

1.4

1.2

1.0

R = 8 ꢀ

L

R = 8 ꢀ

L

2.5

3.5

4.5

5.5

2.5

3.5

4.5

5.5

POWER SUPPLY (V)

Figure 29. Shutdown Current vs. Power Supply

Figure 30. Quiescent Current vs. Power Supply

R_L= 8 ꢀ

1000

100

10

1000

100

10

V = 3.6 V

R = 8 ꢀ

L

V = 5 V

p

R = 8 ꢀ

L

p

No Weighting

With A Weighting

10

100

1000

10000

10

100

1000

10000

FREQUENCY (Hz)

Figure 31. Noise Floor, Inputs AC Grounded

Figure 32. Noise Floor, Inputs AC Grounded

with 1 ꢂF V_p= 3.6 V

with 1 ꢂ F V_p= 5 V

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12

NCP2820

8

11

10

9

T = +85°C

A

7

T = +25°C

A

T = +25°C

A

T = −40°C

A

T = −40°C

A

6

5

8

7

6

T = +85°C

A

4

2.5

3.5

4.5

5.5

2.5

3.5

4.5

5.5

POWER SUPPLY (V)

Figure 34. Turn off Time

Figure 33. Turn on Time

DESCRIPTION INFORMATION

Detailed Description

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.

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 R and the internal

i

fixed feedback resistor R (the closed−loop gain is fixed by

f

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.

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.

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 ꢂ A.

Current Breaker Circuit

Power Amplifier

The maximum output power of the circuit corresponds to

an average current in the load of 820 mA.

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

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.

(R ) of the NMOS and PMOS transistors is typically 0.4

ꢁ

ꢀ.

on

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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13

NCP2820

APPLICATION INFORMATION

NCP2820 PWM Modulation Scheme

The NCP2820 uses a PWM modulation scheme with each

output switching from 0 to the supply voltage. If V = 0 V

outputs OUTM and OUTP are in phase and no current is

flowing through the differential load. When a positive signal

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.

in

OUTP

OUTM

+Vp

0 V

−Vp

Load Current

0 A

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 ꢂ H) and two capacitors (2.2 ꢂ 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 ꢂ F capacitor in parallel with the load,

instead of two 2.2 ꢂ 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 kꢀ

R

i

Input Capacitor Selection (C_in)

The input coupling capacitor blocks the DC voltage at the

amplifier input terminal. This capacitor creates a high−pass

filter with R , the cut−off frequency is given by

in

1

Fc +

.

2 ꢅ R C

i

Optimum Equivalent Capacitance at Output Stage

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.

When using an input resistor set to 150 kꢀ, the gain

configuration is 2 V/V. In such a case, the input capacitor

selection can be from 10 nF to 1 ꢂ 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.

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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14

NCP2820

15 ꢂ H

2.2 ꢂ F

OUTM

15 ꢂ H

OUTM

OUTP

1.0 ꢂ F

15 ꢂ H

2.2 ꢂ F

15 ꢂ H

OUTP

Figure 36. Advanced Optional Audio Output Filter

Figure 37. Optional Audio Output Filter

OUTM

FERRITE

CHIP BEADS

OUTP

Figure 38. Optional EMI Ferrite Bead Filter

Cs

VP

R

i

INP

INM

Differential

Audio Input

from DAC

OUTM

OUTP

SD

Input from

Microcontroller

GND

Figure 39. NCP2820 Application Schematic with Fully Differential Input Configuration

Cs

VP

R

i

INP

INM

Differential

Audio Input

from DAC

OUTM

OUTP

FERRITE

CHIP BEADS

SD

Input from

Microcontroller

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

C

i

VP

R

i

INP

Differential

Audio Input

from DAC

OUTM

OUTP

INM

SD

FERRITE

CHIP BEADS

Input from

Microcontroller

GND

Figure 41. NCP2820 Application Schematic with Differential Input Configuration and

High Pass Filtering Function

Cs

C

i

VP

R

i

INP

INM

OUTM

OUTP

Single−Ended Audio Input

from DAC

SD

Input from

Microcontroller

GND

Figure 42. NCP2820 Application Schematic with Single Ended Input Configuration

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16

NCP2820

V

p

J1

C4*

4.7 ꢂ F

C3*

U1

B1, B2

J7

V

p

C1

R

f

R1

INP

A1

OUTM

A3

150 kꢀ

100 nF

J2

RAMP

GENERATOR

J3

Data

CMOS

Processor

Output

Stage

C2

OUTP

C3

R

f

R2

INM

C1

100 nF

150 kꢀ

300 kꢀ

J8

Shutdown

Control

GND

A2, B3

C2

SD

V

p

*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

J4

J6*

C = NCP2820 ON

L

J5

C = NCP2820 OFF

L

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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17

NCP2820

Figure 45. Silkscreen Layer of the UDFN8 Evaluation Board

PCB Layout Information

A 1.0 ꢂ F low ESR ceramic capacitor can also be used with

slightly degraded performances on the THD+N from 0.06%

up to 0.2%.

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 ꢂ F filtering ceramic capacitor

on the bottom face will give optimized performance.

In a two layers application, if both V pins are connected

p

on the top layer, a single 4.7 ꢂ 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

V =3.0 V and 1.0 W rms output power at V = 4.0 V.

p

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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

Item

Part Description

NCP2820 Audio Amplifier

SMD Resistor 150 kꢀ

Ref

U1

Manufacturer

Part Number

NCP2820

1

2

3

4

5

6

R1, R2

C1, C2

C3, C4

J7, J8

J2

0603

Vishay−Draloric

TDK

CRCW0603

Ceramic Capacitor 100 nF, 50 V, X7R

Ceramic Capacitor 4.7 ꢂ F, 6.3 V, X5R

PCB Footprint

C1608X7R1H104KT

C1608X5R0J475MT

TDK

I/O connector. It can be plugged by

Phoenix Contact

Weidmuller

MC−1,5/3−G

MC−1,5/3−ST−3,81

7

I/O connector. It can be plugged by

BLZ5.08/2 (Weidmuller Reference)

J1, J3

SL5.08/2/90B

8

9

Jumper Connector, 400 mils

J4

J5

Harwin

D3082−B01

5−826629−0

Jumper Header Vertical Mount

3*1, 2.54 mm.

Tyco Electronics / AMP

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19

NCP2820

ORDERING INFORMATION

Device

Marking

MAQ

Package

Shipping†

NCP2820FCT1

9−Pin Flip−Chip CSP

3000 / Tape & Reel

NCP2820FCT1G

MAQG

9−Pin Flip−Chip CSP

(Pb−Free)

3000 / Tape & Reel

T1 Orientation

NCP2820FCT2G

NCP2820MUTBG

MAQG

ZBMG

9−Pin Flip−Chip CSP

(Pb−Free)

3000 / Tape & Reel

T2 Orientation

8 PIN UDFN 2x2.2

3000 / Tape & Reel

(Pb−Free)

†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

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20

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−

4 X

D

0.10

C

−B−

MILLIMETERS

DIM

A

A1 0.210

A2 0.330

MIN

0.540

MAX

0.660

0.270

0.390

E

D

E

b

1.450 BSC

0.290 0.340

0.500 BSC

TOP VIEW

A

e

0.10

0.05

−C−

C

D1

E1

1.000 BSC

C

A2

SEATING

PLANE

A1

SIDE VIEW

D1

e

C

B

A

E1

e

9 X

b

1

2

3

0.05 C A B

0.03 C

BOTTOM VIEW

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21

NCP2820

PACKAGE DIMENSIONS

8 PIN UDFN, 2x2.2, 0.5P

CASE 506AV−01

ISSUE B

NOTES:

A

B

E

1. DIMENSIONING AND TOLERANCING PER

ASME Y14.5M, 1994.

D

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.

PIN ONE

REFERENCE

MILLIMETERS

2X

DIM MIN

0.45

A1 0.00

NOM MAX

A

0.50

0.03

0.55

0.05

0.10

C

TOP VIEW

A3

b

D

0.127 REF

2X

0.10

C

0.20

0.25

2.00 BSC

1.50

0.30

A

(A3)

D2 1.40

1.60

0.90

E

2.20 BSC

0.80

0.10

0.08

C

E2 0.70

e

K

L

0.50 BSC

−−−

0.40

8X

0.20

0.35

−−−

0.45

SEATING

PLANE

SIDE VIEW

D2

C

A1

e

SOLDERING FOOTPRINT*

2.15

8X L

8X

0.48

4

1

8X

0.25

1

E2

0.50

PITCH

1.60

8X K

8

5

8X b

0.10

0.05

C

A B

BOTTOM VIEW

NOTE 3

0.80

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:

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

ON Semiconductor Website: www.onsemi.com

Order Literature: http://www.onsemi.com/orderlit

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: orderlit@onsemi.com

For additional information, please contact your local

Sales Representative

NCP2820/D

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22


型号：	NCP2820AFCT2G
厂家：	ONSEMI
描述：	音频功率放大器，D 级，2.65 W，无滤波器，单声道放大器功率放大器消费电路音频放大器视频放大器
文件：	总22页 (文件大小：288K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

NCP2820AFCT2G [ONSEMI]

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