MPS EV7740DN-01B Manuale utente

EV7740DN-01B

15W Stereo Class D

Single Ended Audio Amplifier

EV7740DN-01B Rev. 1.0 www.MonolithicPower.com 1

10/19/2011 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

The Future of Analog IC Technology

DESCRIPTION

The EV7740DN-01B is the evaluation board for

the MP7740, a stereo 15W Class D Audio

Amplifier. It is one of MPS’ products of fully

integrated audio amplifiers which dramatically

reduce solution size by integrating the following:

250mpower MOSFETs

Startup / Shutdown pop elimination

Short circuit protection circuits

The MP7740 utilizes a single ended output

structure capable of delivering 15W into 4

speakers. MPS Class D Audio Amplifiers exhibit

the high fidelity of a Class A/B amplifier at high

efficiency. The circuit is based on the MPS’

AAMTM proprietary variable frequency topology

that delivers excellent linearity, fast response

time and operates on a single power supply.

ELECTRICAL SPECIFICATIONS

Parameter Symbol Value Units

Supply Voltage VDD 24 V

FEATURES

•15W Output at VDD = 24V into a 4load

•THD+N = 0.05% at 1W, 8, 1KHz

•90% Efficiency at 15W and VDD=24V with

4load

•Low Noise (103V Typical)

•9.5V to 36V Operation from a Single Supply

APPLICATIONS

•Flat Panel TV

•Portable Docking Stations

•Surround Sound DVD Systems

•Televisions

•Multimedia Computers

•Home Stereo Systems

“MPS” and “The Future of Analog IC Technology” are Registered Trademarks

of Monolithic Power Systems, Inc.

AAM (Analog Adaptive Modulation) is a Trademark of Monolithic Power

Systems, Inc.

EV7740 EVALUATION BOARD

Dimensions (2.4”X x 3.5”Y x 1.2”Z)

Board Number MPS IC Number

EV7740DN-01B MP7740

THD+N vs. P

OUT

=24V

Freq=1kHz,A-wtd

THD+N (%)

0.01

0.02

0.05

0.1

0.2

0.5

60m 200m 1 5 20

OUT

(W)

EV7740DN-01B – 15W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER

EV7740DN-01B Rev. 1.0 www.MonolithicPower.com 2

10/19/2011 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

EVALUATION BOARD SCHEMATIC

EV7740DN-01B – 15W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER

EV7740DN-01B Rev. 1.0 www.MonolithicPower.com 3

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EV7740DN-01B BILL OF MATERIALS

Qty Ref Value Description Package Manufacturer Manufacturer P/N

1 C1 2200uF Electrolytic Capacitor, 50V Radial Rubycon

2 C2,C3 2.2uF Electrolytic Capacitor, 50V Radial Rubycon

2 C4,C5 10uF Electrolytic Capacitor, 50V Radial Rubycon

1 C6 5.6nF

Ceramic Capacitor,

50V, X7R 0603 muRata GRM188R71H562KA01

1 C7 4.7nF

Ceramic Capacitor,

50V,X7R 0603 muRata GRM188R71H472KA01

2 C8,C9 NS Not Stuffed

2 C10,C11 22pF

Ceramic Capacitor,

50V,C0G 0603 muRata GRM1885C1H220JA01D

2 C12, C13 0.47uF

Ceramic Capacitor,

16V,X7R 0603 muRata GRM188R71C474KA88D

2 C14,C15 2.2uF

Ceramic Capacitor,

50V,X7R 1206 muRata GRM31CR71H225KA88L

2 C16, C17 390pF

Ceramic Capacitor,

50V,C0G 0603 muRata GRM1885C1H3901JA01

2 C18, C19 0.47uF FILM,50V Radial any

2 C20,C21 1000uF Electrolytic Capacitor, 50V Radial Rubycon

4 C22,C23,

C24,C25 0.1uF Ceramic Capacitor,

50V,X7R 0603 muRata GRM188R71H104KA93D

2 D1, D2, Optional

Diode Schottky,

40V, 3A SMA Diodes B340LA

2 D3, D4 NS Not Stuffed

2 FB1, FB2 Ferrite Bead, 6A 1206 LION PB321611-320

1 SW1 DPDT Slide Switch

2 CN2,CN3 Phono Jack, Female

1 CN1 Banana Jack Connector

1 TP1 Test Point/EXT.EN

1 SP1 Speaker Connector

2 L1, L2 10uH Inductor, 3.61A Radial Toko 10RHBP-#A671HN-100L

2 R1,R2 NS Not Stuffed

4 R3, R4,

R19,R20, 10kFilm Resistor, 1% 0603 Yageo RC0603FR-0710KL

R5,R6,

R7,R8,

100kFilm Resistor, 1% 0603 Yageo RC0603FR-07100KL

2 R10,R18 30.1kFilm Resistor, 1% 0603 Yageo RC0603FR-0730K1L

2 R11, R12 82.5kFilm Resistor, 1% 0603 Yageo RC0603FR-0782K5L

1 R13 200kFilm Resistor, 5% 0603 Yageo RC0603JR-07200KL

4 R14, R15,

R16, R17 10Film Resistor, 1% 0603 Yageo RC0603FR-0710RL

2 R21,R22 10kFilm Resistor, 5% 0603 Yageo RC0603FR-0711RL

2 U1,U2 Class D Audio Amplifier SOIC8E MPS MP7740DN

EV7740DN-01B – 15W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER

EV7740DN-01B Rev. 1.0 www.MonolithicPower.com 4

10/19/2011 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

PRINTED CIRCUIT BOARD LAYOUT

Figure 1—Top Silk Layer Figure 2—Top Layer

Figure 3—Bottom Silk Layer Figure 4—Bottom Layer

MPS

MP7740 Demo Board

EV7740DN-01B

IN1 IN2 For VDD=12V

Remove R18

OUT1 OUT2

VDD

EXT

ENABLE

Figure 5—EV7740DN-01B Connection Diagram

EV7740DN-01B – 15W STEREO CLASS D SINGLE ENDED AUDIO AMPLIFIER

NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.

Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS

products into any application. MPS will not assume any legal responsibility for any said applications.

EV7740DN-01B Rev. 1.0 www.MonolithicPower.com 5

10/19/2011 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

QUICK START GUIDE

1. This board set up from the factory for 24V operation. To use with 36V power supply, adjust the

components as specified in the 36V Operation Modifications section below. To use with 12V

power supply, adjust the components as specified in the 12V Operation Modifications section

below. For more information, consult the MP7740 datasheet.

2. Power Requirements

a. Power supply: 9.5V to 36V, 3A maximum.

b. 0V to 1.5VRMS (max) audio signal source.

c. Speaker: 4to 8(for 12 V and 24V operation). 6to 8(for 36V operation)

3. Setup Condition for 24V Operation

a. Adjust the power supply to 24V (do not turn on).

b. Connect the outputs to the external speakers.

c. Connect the power supply to the VDD terminals.

d. Set the enable switch to the DISABLE position.

e. Connect the audio input signal source to the amplifier inputs (IN1, IN2).

f. Turn on the power supply to apply power to the board.

4. 36V Operation Modifications

a. Change C6 to 8.2nF and C7 to 6.8nF components.

b. Adjust the power supply to 36V (do not turn on).

c. Select 6to 8speaker.

d. Do as step b~f specified in Section 3.

5. 12V Operation Modifications

a. Change C6 to 3.3nF and C7 to 2.2nF components.

b. Remove R18 from the demo board.

c. Adjust the power supply to 12V (do not turn on).

d. Do as step b~f specified in Section 3.

6. Music Turn-On Sequence

Set the enable switch to the ENABLE position.

7. Music Turn-Off Sequence

a. Set the enable switch to the DISABLE position.

b. Turn off power supply.

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