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. 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