MPS EV7747DQ-00A User manual
EV7747DQ-00A
2x20W Stereo Single Ended Class D
Audio Amplifier Evaluation Board
EV7747DQ-00A Rev. 1.0 www.MonolithicPower.com 1
1/5/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The EV7747DQ-00A is the evaluation board for
the MP7747, a 20W mono Class D Audio
Amplifier. It is one of MPS’ products of fully
integrated audio amplifiers which dramatically
reduce solution size by integrating the following:
•250mpower MOSFETs
•Startup / Shutdown pop elimination
•Short circuit protection circuits
The MP7747 utilizes a single ended output
structure capable of delivering 20W 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 9.5~36 V
FEATURES
•2 x 20W Output at VDD = 24V into a 4load
•THD+N = 0.02% at 1W, 8, 1kHz
•91% Efficiency at 20W and VDD=24V with
4load
•Low Noise (103µV 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.
A
AM (Analog Adaptive Modulation) is a Trademark of Monolithic Power
Systems, Inc.
EV7747DQ-00A EVALUATION BOARD
(L x W x H) 3.5” x 2.5” x 1.2”
9.0cm x 6.3cm x 3.0cm
Board Number MPS IC Number
EV7747DQ-00A MP7747DQ
THD+N vs. P
OUT
V
DD
=24V, Freq=1kHz
0.01
20
0.02
0.05
0.1
0.2
0.5
10
5
2
1
THD + N (%)
60m 35100m 1 10
P
OUT
(W)
EV7747DQ-00A –2X20W STEREO SINGLE ENDED CLASS D AUDIO AMPLIFIER EVALUATION BOARD
EV7747DQ-00A Rev. 1.0 www.MonolithicPower.com 2
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© 2011 MPS. All Rights Reserved.
EVALUATION BOARD SCHEMATIC
1
2, 3, 4
CN2
NS
R1
12
2.2uF
C2
10K
R3 5.6nF
C6
12
10uF
C4
10K
R19
0.1uF
C24
1uF
C12
VCC
34.8K
R7
10K
R8
1N4148WS
12
D3
VCC1
2.2uF
C14
BZT52C6V2S
12
D1
10
R14
390pF
C16
10uH
13RHBP-A7502HY-100M
L1
0.47uF
C18
12
1000uF/50V
C20
VCC1
10K
R21
9.53K
R25
0.1uF
C22
OUT1
Left-Speaker
82.5K
R5
22pF
C10
1
2, 3, 4
CN3
NS
R2
12
2.2uF
C3
10K
R4
12
10uF
C5
10K
R20
0.1uF
C25
1uF
C13
VCC
34.8K
R11
10K
R12
1N4148WS
12
D4
VCC2
2.2uF
C15
BZT52C6V2S
12
D2
10
R15
390pF
C17
10uH
13RHBP-A7502HY-100M
L2
0.47uF
C19
12
1000uF/50V
C21
VCC2
10K
R22
9.53K
R26
0.1uF
C23
OUT2
Right-Speaker
82.5K
R6
22pF
C11
CN1
VCC
12
2200uF
C1
VCC
100K
R9
25.5K
R10
25.5K
R18
25
34
16
SW1
200K
R13
EN
EN
EN
EXT.ENABLE
GND
DISABLE/EXT.ENABLE
ENABLE SWITCH
ENABLE
NS
C9
NS
C8
20K
R24
20K
R23
VCC2
VCC1
4.7nF
C7
2.2uF
C27
2.2uF
C26
10
R16
10
R17
FB1
FB2
NIN
2
Timer
3
AGND
4
SW 9
BS 8
VDD 7
PIN
1
EN
5
PGND 10
UVP 6
MP7747
U1
NIN
2
Timer
3
AGND
4
SW 9
BS 8
VDD 7
PIN
1
EN
5
PGND 10
UVP 6
MP7747
U2
EV7747DQ-00A –2X20W STEREO SINGLE ENDED CLASS D AUDIO AMPLIFIER EVALUATION BOARD
EV7747DQ-00A Rev. 1.0 www.MonolithicPower.com 3
1/5/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
EV7747DQ-00A BILL OF MATERIALS
Qty Ref Value Description Package Manufacturer Manufacturer P/N
1 C1 2200µF
Electrolytic Capacitor;
50V DIP Rubycon
2 C2, C3 2.2µF
Electrolytic Capacitor;
50V DIP Rubycon
2 C4, C5 10µF
Electrolytic Capacitor;
50V DIP Rubycon
1 C6 5.6nF
Ceramic Capacitor; 50V;
X7R; 0603 0603 muRata
GRM188R71H562KA
01
1 C7 4.7nF
Ceramic Capacitor; 50V;
X7R; 0603 0603 muRata
GRM188R71H472KA
01D
2 C8, C9 NS 0603
2 C10, C11 22pF
Ceramic Capacitor; 50V;
C0G; 0603 0603 TDK C1608C0G1H220J
2 C12, C13 1µF
Ceramic Capacitor; 16V;
X7R; 0805 0805 muRata
GRM21BR71C105KA
01
2 C14, C15 2.2µF
Ceramic Capacitor; 50V;
X7R; 1206 1206 muRata
GRM31CR71H225K
A88L
2 C16, C17 390pF
Ceramic Capacitor; 50V;
C0G; 0603 0603 muRata
GRM1885C1H391JA
01D
2 C18, C19 0.47µF CBB Capacitor; 50V DIP Panasonic
2 C20, C21 1000µF
Electrolytic Capacitor;
50V DIP Rubycon
2 C22, C23 0.1µF
Ceramic Capacitor; 50V;
X7R; 0603 0603 muRata
GRM188R71H104KA
93D
2 C24, C25 0.1µF
Ceramic Capacitor; 16V;
X7R; 0603 0603 muRata
GRM188R71C104KA
01D
2 C26, C27 2.2µF
Ceramic Capacitor; 10V;
X7R; 0603 0603 muRata
GRM188R71A225KE
15
2 D1, D2
BZT52
C6V2S
Zener Diode; 6.2V;
5mA/200mW SOD-323 Diodes BZT52C6V2S-7-F
2 D3, D4
1N414
8WS Diode; 75V; 0.15A SOD-323 Diodes 1N4148WS-7-F
2 FB1, FB2 Magnetic Bead 1206 LION PB321611-320
2 L1, L2 10µH
Inductor; 10µH; 18m;
3.61A DIP TOKO
13RHBP-A7502HY-
100M
2 R1, R2 NS 0603
8
R3, R4,
R8, R12,
R19, R20,
R21,R22
10kFilm Resistor; 1% 0603 Royalohm 0603F1002T5E
2 R5, R6 82.5kFilm Resistor; 1% 0603 Yageo RC0603FR-0782K5L
2 R7, R11 34.8kFilm Resistor; 1% 0603 Yageo RC0603FR-0734K8L
1 R9 100kFilm Resistor; 1% 0603 Royalohm 0603F1003T5E
2 R10, R18 25.5kFilm Resistor; 1% 0603 Yageo RC0603FR-0725K5L
1 R13 200kFilm Resistor; 5% 0603 Yageo RC0603JR-07200KL
2 R14, R15 10Film Resistor; 1% 0603 Yageo RC0603FR-0710RL
2 R16, R17 10Film Resistor; 1% 1206 Yageo RC1206FR-0710RL
EV7747DQ-00A –2X20W STEREO SINGLE ENDED CLASS D AUDIO AMPLIFIER EVALUATION BOARD
EV7747DQ-00A Rev. 1.0 www.MonolithicPower.com 4
1/5/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
EV7747DQ-00A BILL OF MATERIALS (
Continued
)
Qty Ref Value Description Package Manufacturer Manufacturer P/N
2 R23, R24 20kFilm Resistor; 1% 0603 Yageo RC0603FR-0720KL
2 R25, R26 9.53kFilm Resistor; 1% 0603 Yageo RC0603FR-079K53L
1 SW1 DPDT Slide Switch DIP Any
1 CN1
Connector; Red and
Black Any
2 CN2, CN3 RCA Connector DIP Any
2 OUT1,
OUT2 Connector DIP Any
2 U1, U2 Class D Audio Amplifier QFN10 MPS MP7747DQ
EV7747DQ-00A –2X20W STEREO SINGLE ENDED CLASS D AUDIO AMPLIFIER EVALUATION BOARD
EV7747DQ-00A Rev. 1.0 www.MonolithicPower.com 5
1/5/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
PRINTED CIRCUIT BOARD LAYOUT
Figure 1—Top Silk Layer Figure 2—Top Layer
Figure 3—Bottom Silk Layer (Mirror) Figure 4—Bottom Layer (Mirror)
EV7747DQ-00A –2X20W STEREO SINGLE ENDED CLASS D AUDIO AMPLIFIER EVALUATION BOARD
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.
EV7747DQ-00A Rev. 1.0 www.MonolithicPower.com 6
1/5/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
QUICK START GUIDE
This board is set up from the factory for 24V operation. To use with 36V (12V) power supply, adjust the
components as specified in the 36V (12V) Operation Modifications section below. For more information,
consult the MP7747 datasheet.
Figure 5—EV7747DQ-00A Connection Diagram
1. Power Requirements
a. Power supply: 9.5V to 36V, 4.5A maximum.
b. 0V to 1.5VRMS (max) audio signal source.
c. Speaker: typically 4to 8;
2. 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 (CN2, CN3).
f. Turn on the power supply.
3. 36V Operation Modifications
a. Change C6 to 8.2nF and C7 to 6.8nF.
b. Change R7 & R11 to 64.9k to set 30V VDD shutdown voltage.
c. Adjust the power supply to 36V (do not turn on).
d. Do as step b~f specified in Section 2.
4. 12V Operation Modifications
a. Change C6 to 3.3nF and C7 to 2.2nF.
b. Change R7 & R11 to 15kto set 10V VDD shutdown voltage.
c. Remove R18 to make sure EN signal is high enough @ 12V VDD.
d. Adjust the power supply to 12V (do not turn on).
e. Do as step b~f specified in Section 2.
5. Music Turn-On Sequence
Set the enable switch to the ENABLE position.
6. Music Turn-Off Sequence
a. Set the enable switch to the DISABLE position.
b. Turn off the power supply.
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