NCP2811AMTTXGEVB
http://onsemi.com
4
Table 1. BILL OF MATERIALS
Item
Part Description
Ref.
PCB
Footprint
Manufacturer
Manufacturer Reference
1
NCP2811 Audio
Amplifier
ON Semiconductor
NCP2811
2
SMD Resistor 10K
W
R1, R2, R3, R4
0603
Panasonic
ERJ
−
3GEY103V
3
Ceramic Capacitor
1
m
F 6.3 V X5R
C1, C2, C3, C4, C5
0603
Murata
GRM185R60J105KA01
4
Stereo Connector
U2
CUI Inc.
SJ1
−
3515N
5
Jumper Header
Vertical Mount, 2
positions, 100mils
J16
100 mils
Tyco Electronics / AMP
5
−
826629
−
0
6
I/O Connector, 2
positions
J8, J19, J15
200 mils
Phoenix Contact
1757242
7
Jumper Connector
J18, J20
400 mils
Harwin
D3082
−
B01
8
Not Mounted
R5, J9, J10, J6,
J17,C6, C7
9
Shorted
R6, R7
0603
NCP2811A OR NCP2811B CONFIGURATION
V.1 NCP2811A
Connect J11, J12. Put 10kohms on R1, R2, R3, R4. Disconnect J7, J14.
V.1 NCP2811B
Connect J7, J14. Disconnect J11, J12, R1, R2, R3, R4.
NCP2811 TEST PROCEDURE
Output Power:
1. Set Vp = 3.6 V to power supply connector (J16).
2. Set an 16
W
load (resistance) on the output connectors (J8 and J17).
3. With the function generator, set a single ended signal at 1 kHz and 0.5 Vrms input signal on the left and right inputs.
Apply this signal J5 and J13 connectors.
a. On the NCP2811A, as R1 = R2 = R3 = R4 = 10k, OUTL_C and OUTR_C will see 0.5 Vrms. Place an
oscilloscope probe on each output. You should get 0.5 Vrms output signal with a “perfect sine wave”. That is to
say no clipping at the minima and maxima of the sine wave.
b. On the NCP2811B, the gain is internally set to -1.5 V/V, OUTL_C and OUTR_C will see 0.75 Vrms. Place an
oscilloscope probe on each output. You should get 0.75 Vrms output signal with a “perfect sine wave”. That is
to say no clipping at the minima and maxima of the sine wave.
Quiescent Current:
Check the quiescent current. Place an 16
W
load on each output (J8, J17); no input signal. Vp set to 3.6 V and J6 closed. You
should measure around 6 mA.
