Demonstration Note for NCP2991 - 1.35W Audio Power Amplifier with Selectable Fast Turn On Time

NCP2991DEMO/D
Demonstration Note for
NCP2991 - 1.35 Watt Audio
Power Amplifier with
Selectable Fast Turn On
Time
http://onsemi.com
DEMONSTRATION NOTE
Goal of Document
The purpose of the document is to explain how to use the
NCP2991 demoboard usermanual.
Applicable & Reference Documents
NCP2991/D: NCP2991 Datasheet
J13
HEADER 2
2
START_MODE
POWER SUPPLY
1
2
J3
BNC H
INM
BYP
VO2
J17
A1
INM ST_MODE
B1
OUTA
VM_P
C1
BYP
INP
C2
OUTB
VP
SD
NCP2991
J4
BNC H
VO1
2 J14
HEADER 2
1
VP
C4
1mF
R1
100nF
B2
A2
A3
B3
C3
R5
100nF
24k
1
J16
HEADER 2 2
SHD
2
2
J7
1
1
J12
HEADER 1
1
VP
2 J8
HEADER 2
1
JMP
2
J15
1
JMP
1
R6
24k
1
J6
HEADER 2
R3
150k
J18
HEADER 2_1
C5
VO1
C3
1mF
VO1
INP
VP
SHD
2
HEADER 1
1
J11
VP
HEADER 1
1 VO2
1
J5
J10
2 VO1
HEADER 1
OUTPUT
INM
START_MODE
1
TP1 VP
24k
24k
J9
VO2
R2
C1
BYP
1
J2
HEADER 2 2
TP2 VP TP3 VP
VP
R4
150k
J1
1
J20
HEADER 2_1
2 1
BYP
INP
INP
BYP
2
J19
HEADER 2_1
Figure 1. Demoboard Schematic
© Semiconductor Components Industries, LLC, 2008
October, 2008 − Rev. 0
1
Publication Order Number:
NCP2991DEMO/D
NCP2991DEMO/D
Figure 2. Demoboard Layout − Top View
Figure 3. Demoboard Layout − Bottom View
http://onsemi.com
2
NCP2991DEMO/D
Table 1. Bill of Materials
Item
Part Description
Ref.
PCB
Footprint
Manufacturer
Manufacturer
Reference
ON Semiconductor
NCP2991
1
NCP2991 Audio Amplifier
2
SMD Resistor 24 KW
R1, R2,
R5, R6
0805
Panasonic
ERJ6GEY203V
3
SMD Resistor 150 KW
R3, R4
0805
Panasonic
ERJ6GEY203V
4
Ceramic Capacitor 100 nF 16 V X5R
C1, C5
0805
Murata
GRM21BR71E104KA01
5
Ceramic Capacitor 1 mF 16 V X5R
C3, C4
0805
Murata
GRM216R61C105KA88
6
Jumper Header Vertical Mount,
2 positions, 100 mils
J2, J6,
J8, J13,
J14, J16
100 mils
Tyco Electronics / AMP
58266290
7
I/O Connector, 2 positions
J1, J5
200 mils
Phoenix Contact
1757242
8
Jumper Connector
J7, J15
400 mils
Harwin
D3082B01
9
Not Mounted
J3, J4
Single−ended or Differential Configuration
Figure 4. Single−ended Configuration
Connect J20, disconnect J18 and J19 to use the demoboard in Singleended configuration.
http://onsemi.com
3
NCP2991DEMO/D
Figure 5. Differential Configuration
Connect J18 and J19, disconnect J20 to use the demoboard in Differential configuration.
Test Procedure
Output Power:
4. Place 2 oscilloscope probes on the output
(differential measurement). You should get 1 Vrms
output signal with a “perfect sine wave”. That is to
say no clipping at the minima and maxima of the
sine wave.
1. Set Vp = 5 V to power supply connector (J1).
2. Set an 8 W load (resistance) on the output
connector (J5).
3. With the function generator, set a single ended
signal at 1 kHz and 0.5 Vrms input signal on the
negative input. Apply this signal either on J2 or J3
connector. As R1 = R2 = 24 k, VO1 will see
0.5 Vrms. As VO1 signal is inverted by the second
amplifier, VO2 will also see 0.5 Vrms with 180°
delay. Thus, the load between VO1 and VO2 will
see 1 Vrms.
Quiescent Current:
Check the quiescent current. Place an 8 W load, no input
signal. Vp set to 5 V and J6 closed. You should measure
around 1.9 mA.
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
http://onsemi.com
4
ON Semiconductor Website: www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative
NCP2991DEMO/D
Similar pages