NCP2823BGEVB

NCP2823AGEVB, NCP2823BGEVB NCP2823 Series Evaluation Board User's Manual http://onsemi.com EVAL BOARD USER’S MANUAL Overview The NCP2823A/B are cost effective mono audio power amplifiers designed for portable electronic devices. NCP2823A is optimized for 8 W operation and NCP2823B can operate with speaker impedance down to 4.0 W. For Instance, NCP2823B is capable of delivering 3 W of continuous average power to a 4.0 W from a 5.0 V supply in a Bridge Tied Load (BTL) configuration. Under the same conditions, NCP2823A can provide 1.5 W to an 8.0 W 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 transducers. With more than 95% efficiency and very low shutdown current, it increases the lifetime of your battery and drastically lowers the junction temperature. The intent of the evaluation boards is to illustrate typical operation of the NCP2823 device for laboratory characterization. The NCP2823 Series Evaluation Board schematic is depicted in Figure 3. Figure 1. NCP2823AGEVB Board Picture © Semiconductor Components Industries, LLC, 2012 April, 2012 − Rev. 2 Figure 2. NCP2823BGEVB Board Picture 1 Publication Order Number: EVBUM2108/D NCP2823AGEVB, NCP2823BGEVB BOARD SCHEMATIC J 30 FILTER VD D C3 J5 150k EN C2 1 J 10 J 31 100n C2 R2 C1 150k B2 1 100n A1 INP OU TP out p A3 1 L1 2 NM C9 out pf NM INM A2 1 2 OU TM C3 out n 1 J 17 L2 out nf 2 NM C8 NM N C P2823 0 PROBE CONNECTION 2 1 1 1 2 J7 POWER SUPPLY 0 J2 out n J6 J 13 0 2 1 1 J4 GN D 1 2 C7 100uF J1 1 2 3 2 1 J 25 ENABLE 1 2 out p J 32 VD D J 11 SPEAKER CONNECTION 2 1 0 EN PGN D R1 B3 J9 C1 PVD D U1 1 B1 2 1 J8 J 12 0 NM AVD D BOARD FIXATION HOLES 1 2 0 4. 7uF C4 AGN D 0 1 2 1 J 29 1 J 28 1 1 J 27 J 20 1 2 3 4 5 VD D J 26 EN 0 1 0 J3 0 Tit le Size A D ate: N C P2823EVB D oc um ent N um ber N C P2823EVB TLS−P−001−A−1109−R D Thurs day , J anuary 07, 2010 Sheet R ev A 1 of 1 Figure 3. NCP2823 Series Evaluation Board Schematic OPERATION Performances of EVB Solution The operating power supply of the NCP2823 is from 2.5 to 5.5 V. The absolute maximum input voltage is 7.0 V. A power supply set to 3.6 V and current limit set to at least 1.5 A must be connected to J11 connector to powering the NCP2823 Series Evaluation Board. Also to compensate for parasitic inductance of wires between the power supply and the evaluation board it is highly recommended to connect a 470 mF electrolytic capacitor to bypass J11 terminal. Like this the device can be evaluate under powering condition very similar that battery power supplies. To be as close as possible with final handset application, the design of this power conversion solution used small size footprints where possible. Changing components may positively or negatively impact the evaluation board performance, illustrated in Figure 4 to 9. For more information please refer to the NCP2823 datasheet. http://onsemi.com 2 NCP2823AGEVB, NCP2823BGEVB Table 1. BOARD CONNECTIONS INPUT POWER Symbol Descriptions J11−1 This is the positive connection for power supply. The leads (positive + ground) to the input supply should be twisted and kept as short as possible. J11−2 This is the return connection for the power supply (Ground signal) J4 Ground clip AUDIO Descriptions Symbol J9 Positive Audio input J10 Negative Audio input J17−2 Positive Audio output J17−1 Negative Audio output SWITCHES SETUP Switch Descriptions Symbol J1 Enable J5 Short input capacitor on positive input J6 Short input capacitor on negative input J7 Connect the positive audio input to Gnd J8 Connect the negative audio input to Gnd J31 Short filter on positive output J32 Short filter on negative output J25 Connect negative output to Probe connection (J26) J20 Connect Positive output to Probe connection (J26) TEST POINT Switch Descriptions Symbol J3 This test point is directly connected to the GND J2 This test point is directly connected to the Vdd pin J9 This test point is connected to the positive audio input J10 This test point is connected to the negative audio input J12 This test point is connected to the positive audio output J13 This test point is connected to the negative audio output J26 Probe connection http://onsemi.com 3 NCP2823AGEVB, NCP2823BGEVB TYPICAL OPERATING CHARACTERISTICS THD+ N vs Pout @ 255C V p=2.5V V p=2.7V V p=3V V p=3.6V THD+ N vs Pout @ 255C V p=4.2V V p=5V V p=2.5V V p=5.5V V p=3V V p=3.6V V p=4.2V V p=5V V p=5.5V 100 100 10 THD (% ) 10 THD (%) V p=2.7V 1 1 0.1 0.1 0.01 10 100 1000 0.01 10000 10 100 Pout (mW) Figure 4. THD vs. POUT, RI = 8 W, f = 1 kHz V p=2.7V V p=3V V p=3.6V 10000 Figure 5. THD vs. POUT, RI = 4 W, f = 1 kHz Effi ci e ncy vs vs Pout @ 255C V p=2.5V 1000 Pout (mW) THD vs Fre que ncy @ Pout= 250mW V p=4.2V V p=5V V p=5V V p=5.5V V p=3.6V V p=2.5V 1 100 90 80 70 0.1 THD(%) (% ) 60 50 40 0.01 30 20 10 0.001 0 0 500 1000 1500 10 2000 100 1000 10000 100000 Fr eq( Hz ) Pout (mW) Figure 6. Efficiency vs. POUT, RI = 8 W, f = 1 kHz Figure 7. THD vs. Frequency, RI = 8 W, POUT = 250 mW THD vs Fre que ncy @ Pout= 1W PSRR vs. Fre q I nput gnd (100nF) V p=5V 0 1 − 10 − 20 V p=2.5V V p=3.6V − 30 THD(% ) PSRR (dB) 0.1 V p=4.2V − 40 − 50 − 60 0.01 − 70 − 80 − 90 0.001 10 100 1000 10000 10 100000 100 1000 10000 f r eq ( Hz) Fr eq( Hz ) Figure 9. PSRR vs. Frequency Figure 8. THD vs. Frequency, RI = 8 W, POUT = 1 W http://onsemi.com 4 100000 NCP2823AGEVB, NCP2823BGEVB PCB LAYOUT As with all Class D amplifier, care must has been observed to place the components on the PCB and layout the critical nodes. The evaluation board is made of 4 PCB layers where first internal layer is a GND. Figure 10, Figure 12 and Figure 13 show the layout of the NCP2823 Series evaluation board. For more specific layout guidelines please refer to the NCP2823 datasheet. Figure 10. Assembly Layer TOP Figure 11. Assembly Layer BOTTOM http://onsemi.com 5 NCP2823AGEVB, NCP2823BGEVB Figure 12. Top Layer Routing Figure 13. Bottom Layer Routing http://onsemi.com 6 NCP2823AGEVB, NCP2823BGEVB Table 2. BILL OF MATERIALS Qty Ref Des. Description Size Manufacturer Part Number 1 U1 NCP2823 CSP−9 1.45 x 1.45 mm ON Semiconductor NCP2823 2 C1, C2 Capacitor, Ceramic 100 nF 0603 KEMET C0603C104K5RAC 2 C4 Capacitor, Ceramic 4.7 mF 6.3 V 0603 KEMET C0603C475K9PAC 2 R1, R2 Resistor 150k 1% 0603 Std Any supplier possible 2 J11, J17 Mal. SL5.08/2/90B plus Fem. BLZ 5.08/2 Weidmuller SL5.08/2/90 + BLZ 5.08/2 3 J1 Header 3 pin, 100 mil spacing 0.100 x 2 Std Std 2 J7, J8 Header 2 pin, 100 mil spacing 0.100 x 2 Std Std 1 J7 GND Connection Std Std 9 J2, J3, J9, J10, J12, J13 Test Point Std Std 2 J31, J32 Soldering point must be connected 1 PCB PCB 2.0 in x 2.0 in x 1.0 mm, 4 Layers Any TLS−P−001−A−1109−RD NOTE: Component J20, J25, J26, L1, L2, C8 and C9 are not mounted on this demokit. ASSEMBLY TEST PROCEDURE Wake up test A power supply set to 3.6 V and current limit set to at least 1.5 A must be connected to J15 connector to powering the NCP2823 Series evaluation board. Also to compensate for parasitic inductance of wires between the power supply and the evaluation board it is highly recommended to connect a 470 mF electrolytic capacitor to bypass J11 terminal. Like this the device can be evaluate under powering condition very similar that battery power supplies. These tests are provided in order to guarantee a good assembly of the NCP2823 on its dedicated board, it do not consist in parametric test which is already done at chip level. Switches setup for wire mode test: Symbol J1 Tests: 4. Set the switches in the configuration 5. Power the board with a 3.6 V power supply limited at 1.5 A and bypassed by a 470 mF electrolytic capacitor. 6. Measure DC Output voltage on J12 on J13 and GND. DC Voltage must be equal to 1.8 V 7. Measure DC input voltage on J5−2 on J6−2 and GND. DC Voltage must be equal to 1.26 V Switches setup for shutdown test: J1 Must be connected to VDD (high side) *All other switches must be kept floating SHUTDOWN TEST Symbol Switch Description Switch Description Must be connected to ground (low side) SUMMARY *All other switches must be kept floating Tests: 1. Set the switches in the configuration 2. Power the board with a 3.6 V power supply limited at 1.5A and bypassed by a 470 mF electrolytic capacitor. 3. Measure the current on the power supply (must be inferior to 1 mA) Test Measurement Shutdown test I Supply Wake up test VOUTP, VOUTN VJ9, VJ10 Switch Description I < 1 mA VDC = 1.8 V VDC = 1.26 V NOTE: For each board a Test Result Table must be fully completed (see the next page) http://onsemi.com 7 NCP2823AGEVB, NCP2823BGEVB TEST RESULT TABLE NCP2823 Assembly Test Date Operator Name Board Serial Number Test No. Test Name Results 1 Shutdown mode test I Supply 2 Wake up test VoutP, VoutN 1.8 VJ9, VJ10 1.26 http://onsemi.com 8 Value onsemi, , and other names, marks, and brands are registered and/or common law trademarks of Semiconductor Components Industries, LLC dba “onsemi” or its affiliates and/or subsidiaries in the United States and/or other countries. onsemi owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. 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