NCP2820 Series 2.65 W Filterless Class-D Audio Power Amplifier http://onsemi.com MARKING DIAGRAMS 1 9-PIN FLIP-CHIP CSP FC SUFFIX CASE 499AL C1 xx A Y WW G = AQ for NCP2820 = BD for NCP2820A = Assembly Location = Year = Work Week = Pb-Free Package 8 Features 1 1 •Optimized PWM Output Stage: Filterless Capability •Efficiency up to 90% Low 2.5 mA Typical Quiescent Current •Large Output Power Capability: 1.4 W with 8.0 Load (CSP) and THD + N < 1% •Ultra Fast Start-up Time: 1 ms for NCP2820A Version •High Performance, THD+N of 0.03% @ Vp = 5.0 V, RL = 8.0 , Pout = 100 mW •Excellent PSRR (-65 dB): No Need for Voltage Regulation •Surface Mounted Package 9-Pin Flip-Chip CSPand UDFN8 •Fully Differential Design. Eliminates Two Input Coupling Capacitors •Very Fast Turn On/Off Times with Advanced Rising and Falling Gain Technique •External Gain Configuration Capability •Internally Generated 250 kHz Switching Frequency •“Pop and Click” Noise Protection Circuitry •Pb-Free Packages are Available A3 A1 MxxG AYWW The NCP2820 is a cost-effective mono Class-D audio power amplifier capable of delivering 2.65 W of continuous average power to 4.0 from a 5.0 V supply in a Bridge Tied Load (BTL) configuration. Under the same conditions, the output power stage can provide 1.4 W to a 8.0 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 tranducers. With more than 90% efficiency and very low shutdown current, it increases the lifetime of your battery and drastically lowers the junction temperature. The NCP2820 processes analog inputs with a pulse width modulation technique that lowers output noise and THD when compared to a conventional sigma-delta modulator. The device allows independent gain while summing signals from various audio sources. Thus, in cellular handsets, the earpiece, the loudspeaker and even the melody ringer can be driven with a single NCP2820. Due to its low 42V noise floor, A-weighted, a clean listening is guaranteed no matter the load sensitivity. With zero pop and click noise performance NCP2820A turns on within 1 ms versus 9 ms for NCP2820 version. ZB MG 8 PIN UDFN 2x2.2 MU SUFFIX CASE 506AV ZB M G = Specific Device Code = Date Code = Pb-Free Package ORDERING INFORMATION See detailed ordering and shipping information on page 20 of this data sheet. Cs Audio Input from DAC VP Ri INP Ri INM OUTM OUTP Input from Microcontroller SD Applications •Cellular Phone •Portable Electronic Devices •PDAs and Smart Phones •Portable Computer GND Cs Ri 1.6 mm Ri 3.7 mm © Semiconductor Components Industries, LLC, 2007 September, 2007 - Rev. 6 1 Publication Order Number: NCP2820/D NCP2820 Series PIN CONNECTIONS UDFN8 9-Pin Flip-Chip CSP A1 A2 A3 SD 1 8 OUTM INP GND OUTM VP 2 7 GND B1 B2 B3 INP 3 6 VP VP VP GND INM C1 C2 C3 4 5 OUTP INM SD (Top View) (Top View) OUTP BATTERY Cs Vp Ri Rf INM OUTP Data Processor Negative Differential Input Ri CMOS Output Stage OUTM Rf INP RL = 8 RAMP GENERATOR 300 k Positive Differential Input Shutdown Control GND SD Vih Vil Figure 1. Typical Application PIN DESCRIPTION Pin No. CSP UDFN8 Symbol Type A1 3 INP I Positive Differential Input. A2 7 GND I Analog Ground. A3 8 OUTM O Negative BTL Output. B1 2 Vp I Analog Positive Supply. Range: 2.5 V – 5.5 V. B2 6 Vp I Power Analog Positive Supply. Range: 2.5 V – 5.5 V. B3 7 GND I Analog Ground. C1 4 INM I Negative Differential Input. C2 1 SD I The device enters in Shutdown Mode when a low level is applied on this pin. An internal 300 k resistor will force the device in shutdown mode if no signal is applied to this pin. It also helps to save space and cost. C3 5 OUTP O Positive BTL Output. Description http://onsemi.com 2 NCP2820 Series MAXIMUM RATINGS Symbol Rating Vp Supply Voltage Vin Input Voltage Iout Max Output Current (Note 1) Pd Power Dissipation (Note 2) TA Operating Ambient Temperature TJ Max Junction Temperature Tstg Storage Temperature Range RJA Thermal Resistance Junction-to-Air - ESD Protection Human Body Model (HBM) (Note 4) Machine Model (MM) (Note 5) - Latchup Current @ TA = 85°C (Note 6) MSL Active Mode Shutdown Mode 9-Pin Flip-Chip UDFN8 9-Pin Flip-Chip UDFN8 Moisture Sensitivity (Note 7) Max Unit 6.0 7.0 V -0.3 to VCC +0.3 V 1.5 A Internally Limited - -40 to +85 °C 150 °C -65 to +150 °C 90 (Note 3) 50 °C/W > 2000 > 200 V $70 $100 mA Level 1 Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. The device is protected by a current breaker structure. See “Current Breaker Circuit” in the Description Information section for more information. 2. The thermal shutdown is set to 160°C (typical) avoiding irreversible damage to the device due to power dissipation. 3. For the 9-Pin Flip-Chip CSP package, the RJA is highly dependent of the PCB Heatsink area. For example, RJA can equal 195°C/W with 50 mm2 total area and also 135°C/W with 500 mm2. When using ground and power planes, the value is around 90°C/W, as specified in table. 4. Human Body Model: 100 pF discharged through a 1.5 k resistor following specification JESD22/A114. On 9-Pin Flip-Chip, B2 Pin (VP) is qualified at 1500 V. 5. Machine Model: 200 pF discharged through all pins following specification JESD22/A115. 6. Latchup Testing per JEDEC Standard JESD78. 7. Moisture Sensitivity Level (MSL): 1 per IPC/JEDEC standard: J-STD-020A. http://onsemi.com 3 NCP2820 Series ELECTRICAL CHARACTERISTICS (Limits apply for TA = +25°C unless otherwise noted) (NCP2820FCT1G and NCP2820FCT2G) Characteristic Symbol Conditions Min Typ Max Unit Operating Supply Voltage Vp TA = -40°C to +85°C 2.5 - 5.5 V Supply Quiescent Current Idd Vp = 3.6 V, RL = 8.0 Vp = 5.5 V, No Load Vp from 2.5 V to 5.5 V, No Load TA = -40°C to +85°C - 2.15 2.61 - mA - - 4.6 Shutdown Current Isd Vp = 4.2 V TA = +25°C TA = +85°C - 0.42 0.45 0.8 - Vp = 5.5 V TA = +25°C TA = +85°C - 0.8 0.9 1.5 - 1.2 - - A A Shutdown Voltage High Vsdih Shutdown Voltage Low Vsdil - - 0.4 V Switching Frequency Fsw Vp from 2.5 V to 5.5 V TA = -40°C to +85°C 190 250 310 kHz G RL = 8.0 285 k Ri 300 k Ri 315 k Ri V V Output Impedance in Shutdown Mode ZSD - 300 - Resistance from SD to GND Rs - - 300 - k Gain Output Offset Voltage V Vos Vp = 5.5 V - 6.0 - mV Turn On Time NCP2820 NCP2820A Ton Vp from 2.5 V to 5.5 V - 9.0 1.0 3.0 ms Turn Off Time NCP2820 NCP2820A Toff Vp from 2.5 V to 5.5 V - 5.0 0.5 - ms Thermal Shutdown Temperature Tsd - - 160 - °C Output Noise Voltage Vn Vp = 3.6 V, f = 20 Hz to 20 kHz no weighting filter with A weighting filter - 65 42 - RL = 8.0 , f = 1.0 kHz, THD+N < 1% Vp = 2.5 V Vp = 3.0 V Vp = 3.6 V Vp = 4.2 V Vp = 5.0 V - 0.32 0.48 0.7 0.97 1.38 - RL = 8.0 , f = 1.0 kHz, THD+N < 10% Vp = 2.5 V Vp = 3.0 V Vp = 3.6 V Vp = 4.2 V Vp = 5.0 V - 0.4 0.59 0.87 1.19 1.7 - RL = 4.0 , f = 1.0 kHz, THD+N < 1% Vp = 2.5 V Vp = 3.0 V Vp = 3.6 V Vp = 4.2 V Vp = 5.0 V - 0.49 0.72 1.06 1.62 2.12 - RL = 4.0 , f = 1.0 kHz, THD+N < 10% Vp = 2.5 V Vp = 3.0 V Vp = 3.6 V Vp = 4.2 V Vp = 5.0 V - 0.6 0.9 1.33 2.0 2.63 - RMS Output Power Po http://onsemi.com 4 Vrms W W W W NCP2820 Series ELECTRICAL CHARACTERISTICS (Limits apply for TA = +25°C unless otherwise noted) (NCP2820FCT1G and NCP2820FCT2G) Characteristic Efficiency Total Harmonic Distortion + Noise Common Mode Rejection Ratio Power Supply Rejection Ratio Symbol Conditions Min Typ Max - RL = 8.0 , f = 1.0 kHz Vp = 5.0 V, Pout = 1.2 W Vp = 3.6 V, Pout = 0.6 W - 91 90 - RL = 4.0 , f = 1.0 kHz Vp = 5.0 V, Pout = 2.0 W Vp = 3.6 V, Pout = 1.0 W - 82 81 - - 0.05 - - 0.09 - - -62 - - -56 -57 - THD+N CMRR PSRR Vp = 5.0 V, RL = 8.0 , f = 1.0 kHz, Pout = 0.25 W Vp = 3.6 V, RL = 8.0 , f = 1.0 kHz, Pout = 0.25 W Vp from 2.5 V to 5.5 V Vic = 0.5 V to Vp - 0.8 V Vp = 3.6 V, Vic = 1.0 Vpp f = 217 Hz f = 1.0 kHz Vp_ripple_pk-pk = 200 mV, RL = 8.0 , Inputs AC Grounded Vp = 3.6 V f = 217 kHz f = 1.0 kHz Unit % % dB dB - -62 -65 - ELECTRICAL CHARACTERISTICS (Limits apply for TA = +25°C unless otherwise noted) (NCP2820MUTBG) Characteristic Symbol Conditions Min Typ Max Unit Operating Supply Voltage Vp TA = -40°C to +85°C 2.5 - 5.5 V Supply Quiescent Current Idd Vp = 3.6 V, RL = 8.0 Vp = 5.5 V, No Load Vp from 2.5 V to 5.5 V, No Load TA = -40°C to +85°C - 2.15 2.61 - mA - - 3.8 Vp = 4.2 V TA = +25°C TA = +85°C - 0.42 0.45 0.8 2.0 Vp = 5.5 V TA = +25°C TA = +85°C - 0.8 0.9 1.5 - 1.2 - - Shutdown Current Isd A A Shutdown Voltage High Vsdih Shutdown Voltage Low Vsdil - - 0.4 V Switching Frequency Fsw Vp from 2.5 V to 5.5 V TA = -40°C to +85°C 180 240 300 kHz G RL = 8.0 285 k Ri 300 k Ri 315 k Ri V V ZSD - 20 - k Gain Output Impedance in Shutdown Mode V Resistance from SD to GND Rs - - 300 - k Output Offset Voltage Vos Vp = 5.5 V - 6.0 - mV Turn On Time Ton Vp from 2.5 V to 5.5 V - 1.0 - s Turn Off Time Toff Vp from 2.5 V to 5.5 V - 1.0 - s Thermal Shutdown Temperature Tsd - - 160 - °C Output Noise Voltage Vn Vp = 3.6 V, f = 20 Hz to 20 kHz no weighting filter with A weighting filter - 65 42 - http://onsemi.com 5 Vrms NCP2820 Series ELECTRICAL CHARACTERISTICS (Limits apply for TA = +25°C unless otherwise noted) (NCP2820MUTBG) Characteristic RMS Output Power Efficiency Total Harmonic Distortion + Noise Common Mode Rejection Ratio Power Supply Rejection Ratio Symbol Conditions Min Typ Max Po RL = 8.0 , f = 1.0 kHz, THD+N < 1% Vp = 2.5 V Vp = 3.0 V Vp = 3.6 V Vp = 4.2 V Vp = 5.0 V - 0.22 0.33 0.45 0.67 0.92 - RL = 8.0 , f = 1.0 kHz, THD+N < 10% Vp = 2.5 V Vp = 3.0 V Vp = 3.6 V Vp = 4.2 V Vp = 5.0 V - 0.36 0.53 0.76 1.07 1.49 - RL = 4.0 , f = 1.0 kHz, THD+N < 1% Vp = 2.5 V Vp = 3.0 V Vp = 3.6 V Vp = 4.2 V Vp = 5.0 V - 0.24 0.38 0.57 0.83 1.2 - RL = 4.0 , f = 1.0 kHz, THD+N < 10% Vp = 2.5 V Vp = 3.0 V Vp = 3.6 V Vp = 4.2 V Vp = 5.0 V - 0.52 0.8 1.125 1.58 2.19 - RL = 8.0 , f = 1.0 kHz Vp = 5.0 V, Pout = 1.2 W Vp = 3.6 V, Pout = 0.6 W - 87 87 - RL = 4.0 , f = 1.0 kHz Vp = 5.0 V, Pout = 2.0 W Vp = 3.6 V, Pout = 1.0 W - 79 78 - - 0.05 - - 0.06 - - -62 - - -56 -57 - - THD+N CMRR PSRR Vp = 5.0 V, RL = 8.0 , f = 1.0 kHz, Pout = 0.25 W Vp = 3.6 V, RL = 8.0 , f = 1.0 kHz, Pout = 0.25 W Vp from 2.5 V to 5.5 V Vic = 0.5 V to Vp - 0.8 V Vp = 3.6 V, Vic = 1.0 Vpp f = 217 Hz f = 1.0 kHz Vp_ripple_pk-pk = 200 mV, RL = 8.0 , Inputs AC Grounded Vp = 3.6 V f = 217 kHz f = 1.0 kHz http://onsemi.com 6 Unit W W W W % % dB dB - -62 -65 - NCP2820 Series Ci + Audio Input Signal NCP2820 Ri INP Ci - + OUTM Load Ri INM Measurement Input - OUTP VP 30 kHz Low Pass Filter GND 4.7 F + Power Supply - Figure 2. Test Setup for Graphs NOTES: 1. Unless otherwise noted, Ci = 100 nF and Ri= 150 k. Thus, the gain setting is 2 V/V and the cutoff frequency of the input high pass filter is set to 10 Hz. Input capacitors are shorted for CMRR measurements. 2. To closely reproduce a real application case, all measurements are performed using the following loads: RL = 8 means Load = 15 H + 8 + 15 H RL = 4 means Load = 15 H + 4 + 15 H Very low DCR 15 H inductors (50 m) have been used for the following graphs. Thus, the electrical load measurements are performed on the resistor (8 or 4 ) in differential mode. 3. For Efficiency measurements, the optional 30 kHz filter is used. An RC low-pass filter is selected with (100 , 47 nF) on each PWM output. http://onsemi.com 7 NCP2820 Series TYPICAL CHARACTERISTICS 100 100 NCP2820 CSP EFFICIENCY (%) 80 90 DIE TEMPERATURE (°C) 90 NCP2820 DFN 70 60 50 40 Class AB 30 Vp = 5 V RL = 8 20 10 80 Class AB 70 Vp = 5 V RL = 8 60 50 40 30 0 NCP2820 20 0 0.2 0.4 0.6 Pout (W) 0.8 0 1 0.6 0.8 1.0 1.2 1.4 Figure 4. Die Temperature vs. Pout Vp = 5 V, RL = 8 , f = 1 kHz @ TA = +25°C 60 100 NCP2820 CSP 80 55 DIE TEMPERATURE (°C) 90 EFFICIENCY (%) 0.4 Pout (W) Figure 3. Efficiency vs. Pout Vp = 5 V, RL = 8 , f = 1 kHz NCP2820 DFN 70 60 50 40 Class AB 30 20 Vp = 3.6 V RL = 8 10 50 Class AB 45 Vp = 3.6 V RL = 8 40 35 30 25 NCP2820 20 0 0 0.1 0.2 0.3 0.4 Pout (W) 0.5 0.6 0 0.7 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Pout (W) Figure 8. Die Temperature vs. P out Vp = 3.6 V, RL = 8 , f = 1 kHz @ TA = +25°C Figure 5. Efficiency vs. P out Vp = 3.6 V, RL = 8 , f = 1 kHz 90 160 NCP2820 CSP 80 140 DIE TEMPERATURE (°C) NCP2820 DFN 70 EFFICIENCY % 0.2 60 50 40 Class AB 30 20 Vp = 5 V RL = 4 10 0.5 1 1.5 120 100 Vp = 5 V RL = 4 80 60 40 0 0 Class AB NCP2820 20 2 0 Pout (W) Figure 6. Efficiency vs. Pout Vp = 5 V, RL = 4 , f = 1 kHz 0.5 1.0 Pout (W) 1.5 Figure 7. Die Temperature vs. Pout Vp = 5 V, RL = 4 , f = 1 kHz @ TA = +25°C http://onsemi.com 8 2.0 NCP2820 Series TYPICAL CHARACTERISTICS 100 90 NCP2820 CSP 80 DIE TEMPERATURE (°C) 70 EFFICIENCY % 90 NCP2820 DFN 60 50 40 Class AB 30 Vp = 3.6 V RL = 4 20 10 Class AB 80 70 Vp = 3.6 V RL = 4 60 50 40 NCP2820 30 0 20 0 0.2 0.4 0.6 0.8 1 0 1.2 0.2 0.8 1.0 Pout (W) Figure 10. Die Temperature vs. Pout Vp = 3.6 V, RL = 4 , f = 1 kHz @ TA = +25°C Figure 9. Efficiency vs. Pout Vp = 3.6 V, RL = 4 , f = 1 kHz 10 10 Vp = 5.0 V RL = 8 f = 1 kHz 1.0 THD+N (%) THD+N (%) 0.6 0.4 Pout (W) NCP2820 DFN 1.0 Vp = 4.2 V RL = 8 f = 1 kHz NCP2820 DFN 0.1 0.1 NCP2820 CSP NCP2820 CSP 0.01 0 0.01 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0.2 0.4 Pout (W) 0.8 1.0 1.2 Pout (W) Figure 12. THD+N vs. Pout Vp = 4.2 V, RL = 8 , f = 1 kHz Figure 11. THD+N vs. Pout Vp = 5 V, RL = 8 , f = 1 kHz 10 10 Vp = 3.6 V RL = 8 f = 1 kHz 1.0 THD+N (%) THD+N (%) 0.6 NCP2820 DFN 0.1 1.0 Vp = 3 V RL = 8 f = 1 kHz NCP2820 DFN 0.1 NCP2820 CSP NCP2820 CSP 0.01 0 0.2 0.4 0.6 0.01 0 0.8 Pout (W) 0.1 0.2 0.3 0.4 Pout (W) Figure 14. THD+N vs. Pout Vp = 3 V, RL = 8 , f = 1 kHz Figure 13. THD+N vs. Pout Vp = 3.6 V, RL = 8 , f = 1 kHz http://onsemi.com 9 0.5 0.6 NCP2820 Series TYPICAL CHARACTERISTICS 10 10 Vp = 5 V RL = 4 f = 1 kHz 1.0 THD+N (%) THD+N (%) Vp = 2.5 V RL = 8 f = 1 kHz NCP2820 DFN 0.1 0.01 0 NCP2820 CSP 0.1 0.2 0.3 0.5 1.0 Figure 16. THD+N vs. Pout Vp = 5 V, RL = 4 , f = 1 kHz 2.5 10 Vp = 4.2 V RL = 4 f = 1 kHz 1.0 Vp = 3.6 V RL = 4 f = 1 kHz 0.1 0.5 1.0 1.5 0.01 0 2.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 Pout (W) Figure 17. THD+N vs. Pout Vp = 4.2 V, RL = 4 , f = 1 kHz Figure 18. THD+N vs. Pout Vp = 3.6 V, RL = 4 , f = 1 kHz 10 10 Vp = 2.5 V RL = 4 f = 1 kHz THD+N (%) Vp = 3 V RL = 4 f = 1 kHz THD+N (%) 2.0 Figure 15. THD+N vs. Pout Vp = 2.5 V, RL = 8 , f = 1 kHz Pout (W) 1.0 0.1 0 1.5 Pout (W) THD+N (%) THD+N (%) 0 Pout (W) 0.1 0.01 0 0.1 0.01 0.4 10 1.0 1.0 0.2 0.4 0.6 0.8 1.0 1.0 0.1 0 Pout (W) 0.1 0.2 0.3 0.4 0.5 Pout (W) Figure 20. THD+N vs. Power Out Vp = 2.5 V, RL = 4 , f = 1 kHz Figure 19. THD+N vs. Power Out Vp = 3 V, RL = 4 , f = 1 kHz http://onsemi.com 10 0.6 NCP2820 Series TYPICAL CHARACTERISTICS 2.0 3.0 RL = 8 f = 1 kHz NCP2820 DFN THD+N = 10% 2.0 NCP2820 CSP THD+N = 10% 1.0 Pout (W) Pout (W) 1.5 RL = 4 f = 1 kHz 2.5 THD+N = 10% 1.5 THD+N = 1% 1.0 0.5 NCP2820 CSP THD+N = 1% 3.0 3.5 4.0 4.5 0.5 0 2.5 5.0 3.0 3.5 4.0 4.5 5.0 POWER SUPPLY (V) POWER SUPPLY (V) Figure 21. Output Power vs. Power Supply RL = 8 @ f = 1 kHz Figure 22. Output Power vs. Power Supply RL = 4 @ f = 1 kHz 10 10 1.0 1.0 THD+N (%) THD+N (%) 0 2.5 NCP2820 DFN THD+N = 3% Vp = 2.5 V Vp = 3.6 V 0.1 Vp = 3.6 V Vp = 2.5 V 0.1 Vp = 5 V Vp = 5 V 100 1000 10000 0.01 10 100000 Figure 24. THD+N vs. Frequency RL = 4 , Pout = 250 mW @ f = 1 kHz -30 -30 -40 -40 Vp = 5 V Inputs to GND RL = 8 -70 100 1000 10000 Vp = 3.6 V Inputs to GND RL = 4 -70 100000 100000 Vp = 5 V -50 -60 Vp = 3.6 V -80 10 10000 Figure 23. THD+N vs. Frequency RL = 8 , Pout = 250 mW @ f = 1 kHz -20 -60 1000 FREQUENCY (Hz) -20 -50 100 FREQUENCY (Hz) PSSR (dB) PSSR (dB) 0.01 10 -80 10 100 1000 10000 100000 FREQUENCY (Hz) FREQUENCY (Hz) Figure 25. PSRR vs. Frequency Inputs Grounded, RL = 8 , Vripple = 200 mvpkpk Figure 26. PSRR vs. Frequency Inputs grounded, RL = 4 , Vripple = 200 mVpkpk http://onsemi.com 11 NCP2820 Series -20 3.5 -30 3.0 QUIESCENT CURRENT (mA) CMMR (dB) TYPICAL CHARACTERISTICS -40 -50 -60 Vp = 3.6 V RL = 8 -70 -80 10 100 1000 10000 2.5 2.0 Thermal Shutdown Vp = 3.6 V RL = 8 1.5 1.0 0.5 0 120 100000 130 FREQUENCY (Hz) 160 Figure 28. Thermal Shutdown vs. Temperature Vp = 5 V, RL = 8 , 900 2.8 RL = 8 800 SHUTDOWN CURRENT (nA) SHUTDOWN CURRENT (nA) 150 TEMPERATURE (°C) Figure 27. PSRR vs. Frequency Vp = 3.6 V, RL = 8 , Vic = 200 mvpkpk 700 600 500 400 300 200 RL = 8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 100 0 2.5 3.5 4.5 1.0 2.5 5.5 3.5 4.5 5.5 POWER SUPPLY (V) POWER SUPPLY (V) Figure 29. Shutdown Current vs. Power Supply RL = 8 Figure 30. Quiescent Current vs. Power Supply RL = 8 1000 1000 Vp = 5 V RL = 8 100 NOISE (Vrms) Vp = 3.6 V RL = 8 NOISE (Vrms) 140 No Weighting 100 No Weighting With A Weighting 10 10 100 With A Weighting 1000 10000 10 10 FREQUENCY (Hz) 100 1000 10000 FREQUENCY (Hz) Figure 31. Noise Floor, Inputs AC Grounded with 1 F Vp = 3.6 V Figure 32. Noise Floor, Inputs AC Grounded with 1 F Vp = 5 V http://onsemi.com 12 NCP2820 Series 8 11 TURN OFF TIME (mS) TURN ON TIME (mS) TA = +85°C 10 TA = +25°C 9 TA = -40°C 8 7 TA = +25°C TA = -40°C 6 5 TA = +85°C 7 6 2.5 3.5 4.5 4 2.5 5.5 3.5 4.5 POWER SUPPLY (V) POWER SUPPLY (V) Figure 33. Turn on Time Figure 34. Turn off Time 5.5 DESCRIPTION INFORMATION Detailed Description The basic structure of the NCP2820 is composed of one analog pre-amplifier, a pulse width modulator and an H-bridge CMOS power stage. The first stage is externally configurable with gain-setting resistor Ri and the internal fixed feedback resistor Rf (the closed-loop gain is fixed by the ratios of these resistors) and the other stage is fixed. The load is driven differentially through two output stages. The differential PWM output signal is a digital image of the analog audio input signal. The human ear is a band pass filter regarding acoustic waveforms, the typical values of which are 20 Hz and 20 kHz. Thus, the user will hear only the amplified audio input signal within the frequency range. The switching frequency and its harmonics are fully filtered. The inductive parasitic element of the loudspeaker helps to guarantee a superior distortion value. the fast turn on and off times, the shutdown signal can be used as a mute signal as well. Turn On and Turn Off Transitions in the 9 Pin Flip-Chip Package (NCP2820) In the case of the NCP2820A, the sequences are the same as the NCP2820. Only the timing is different with 1 ms for the turn on and 500 s for the turn off sequence. Turn On and Turn Off Transitions in the UDFN8 In the case of the UDFN8 package, the audio signal is established instantaneously after the rising edge on the shutdown pin. The audio is also suddenly cut once a low level is sent to the amplifier. This way to turn on and off the device in a very fast way also prevents from “pop & click” noise. Shutdown Function The device enters shutdown mode when the shutdown signal is low. During the shutdown mode, the DC quiescent current of the circuit does not exceed 1.5 A. Power Amplifier The output PMOS and NMOS transistors of the amplifier have been designed to deliver the output power of the specifications without clipping. The channel resistance (Ron) of the NMOS and PMOS transistors is typically 0.4. Current Breaker Circuit The maximum output power of the circuit corresponds to an average current in the load of 820 mA. In order to limit the excessive power dissipation in the load if a short-circuit occurs, a current breaker cell shuts down the output stage. The current in the four output MOS transistors are real-time controlled, and if one current exceeds the threshold set to 1.5 A, the MOS transistor is opened and the current is reduced to zero. As soon as the short-circuit is removed, the circuit is able to deliver the expected output power. This patented structure protects the NCP2820. Since it completely turns off the load, it minimizes the risk of the chip overheating which could occur if a soft current limiting circuit was used. Turn On and Turn Off Transitions in the 9 Pin Flip-Chip Package (NCP2820) In order to eliminate “pop and click” noises during transition, the output power in the load must not be established or cutoff suddenly. When a logic high is applied to the shutdown pin, the internal biasing voltage rises quickly and, 4 ms later, once the output DC level is around the common mode voltage, the gain is established slowly (5.0 ms). This method to turn on the device is optimized in terms of rejection of “pop and click” noises. Thus, the total turn on time to get full power to the load is 9 ms (typical). The device has the same behavior when it is turned-off by a logic low on the shutdown pin. No power is delivered to the load 5 ms after a falling edge on the shutdown pin. Due to http://onsemi.com 13 NCP2820 Series APPLICATION INFORMATION NCP2820 PWM Modulation Scheme is applied, OUTP duty cycle is greater than 50% and OUTM is less than 50%. With this configuration, the current through the load is 0 A most of the switching period and thus power losses in the load are lowered. The NCP2820 uses a PWM modulation scheme with each output switching from 0 to the supply voltage. If Vin = 0 V outputs OUTM and OUTP are in phase and no current is flowing through the differential load. When a positive signal OUTP OUTM +Vp 0V -Vp Load Current 0A Figure 35. Output Voltage and Current Waveforms into an Inductive Loudspeaker DC Output Positive Voltage Configuration Voltage Gain An optional filter can be used for filtering high frequency signal before the speaker. In this case, the circuit consists of two inductors (15 H) and two capacitors (2.2 F) (Figure 36). The size of the inductors is linked to the output power requested by the application. A simplified version of this filter requires a 1 F capacitor in parallel with the load, instead of two 2.2 F connected to ground (Figure 37). Cellular phones and portable electronic devices are great applications for Filterless Class-D as the track length between the amplifier and the speaker is short, thus, there is usually no need for an EMI filter. However, to lower radiated emissions as much as possible when used in filterless mode, a ferrite filter can often be used. Select a ferrite bead with the high impedance around 100 MHz and a very low DCR value in the audio frequency range is the best choice. The MPZ1608S221A1 from TDK is a good choice. The package size is 0603. The first stage is an analog amplifier. The second stage is a comparator: the output of the first stage is compared with a periodic ramp signal. The output comparator gives a pulse width modulation signal (PWM). The third and last stage is the direct conversion of the PWM signal with MOS transistors H-bridge into a powerful output signal with low impedance capability. With an 8 load, the total gain of the device is typically set to: 300k Ri Input Capacitor Selection (Cin) The input coupling capacitor blocks the DC voltage at the amplifier input terminal. This capacitor creates a high-pass filter with Rin, the cut-off frequency is given by Fc + 2 1 Ri Ci . Optimum Equivalent Capacitance at Output Stage When using an input resistor set to 150 k, the gain configuration is 2 V/V. In such a case, the input capacitor selection can be from 10 nF to 1 F with cutoff frequency values between 1 Hz and 100 Hz. The NCP2820 also includes a built in low pass filtering function. It's cut off frequency is set to 20 kHz. If the optional filter described in the above section isn't selected. Cellular phones and wireless portable devices design normally put several Radio Frequency filtering capacitors and ESD protection devices between Filter less Class D outputs and loudspeaker. Those devices are usually connected between amplifier output and ground. In order to achieve the best sound quality, the optimum value of total equivalent capacitance between each output terminal to the ground should be less than or equal to 150 pF. This total equivalent capacitance consists of the radio frequency filtering capacitors and ESD protection device equivalent parasitic capacitance. Optional Output Filter This filter is optional due to the capability of the speaker to filter by itself the high frequency signal. Nevertheless, the high frequency is not audible and filtered by the human ear. http://onsemi.com 14 NCP2820 Series 15 H 15 H OUTM RL = 8 2.2 F 1.0 F 2.2 F RL = 8 OUTM OUTP 15 H OUTP 15 H Figure 36. Advanced Optional Audio Output Filter Figure 37. Optional Audio Output Filter RL = 8 OUTM FERRITE CHIP BEADS OUTP Figure 38. Optional EMI Ferrite Bead Filter Cs VP Ri Differential Audio Input from DAC INP Ri OUTM INM OUTP SD Input from Microcontroller GND Figure 39. NCP2820 Application Schematic with Fully Differential Input Configuration Cs Differential Audio Input from DAC Ri Ri VP INP OUTM INM FERRITE CHIP BEADS Input from Microcontroller OUTP SD GND Figure 40. NCP2820 Application Schematic with Fully Differential Input Configuration and Ferrite Chip Beads as an Output EMI Filter http://onsemi.com 15 NCP2820 Series Cs Ci VP Ri Differential Audio Input from DAC INP Ri OUTM INM FERRITE CHIP BEADS Ci OUTP SD Input from Microcontroller GND Figure 41. NCP2820 Application Schematic with Differential Input Configuration and High Pass Filtering Function Cs Ci Single-Ended Audio Input from DAC VP Ri INP Ri OUTM INM Ci OUTP SD Input from Microcontroller GND Figure 42. NCP2820 Application Schematic with Single Ended Input Configuration http://onsemi.com 16 NCP2820 Series Vp J1 C3* C4* 4.7 F U1 B1, B2 J7 Vp J2 R1 INP 100 nF 150 k Rf OUTM A1 A3 RAMP GENERATOR J3 Data Processor C2 R2 INM 100 nF 150 k C1 RL = 8 C1 CMOS Output Stage OUTP Rf C3 300 k J8 SD Shutdown Control GND A2, B3 C2 Vp *J6 not Mounted *C3 not Mounted in case of 9 Pin Flip-Chip Evaluation Board *C4 not Defined in case of UDFN8 Evaluation Board. J5 J6* CL = NCP2820 ON J4 J5 CL = NCP2820 OFF Figure 43. Schematic of the Demonstration Board of the 9-pin Flip Chip CSP Device Figure 44. Silkscreen Layer of the 9 Pin Flip-Chip Evaluation Board http://onsemi.com 17 NCP2820 Series Figure 45. Silkscreen Layer of the UDFN8 Evaluation Board A 1.0 F low ESR ceramic capacitor can also be used with slightly degraded performances on the THD+N from 0.06% up to 0.2%. In a two layers application, if both Vp pins are connected on the top layer, a single 4.7 F decoupling capacitor will optimize the THD+N level. The NCP2820 power audio amplifier can operate from 2.5 V until 5.5 V power supply. With less than 2% THD+N, it delivers 500 mW rms output power to a 8.0 load at Vp =3.0 V and 1.0 W rms output power at Vp = 4.0 V. PCB Layout Information NCP2820 is suitable for low cost solution. In a very small package it gives all the advantages of a Class-D audio amplifier. The required application board is focused on low cost solution too. Due to its fully differential capability, the audio signal can only be provided by an input resistor. If a low pass filtering function is required, then an input coupling capacitor is needed. The values of these components determine the voltage gain and the bandwidth frequency. The battery positive supply voltage requires a good decoupling capacitor versus the expected distortion. When the board is using Ground and Power planes with at least 4 layers, a single 4.7 F filtering ceramic capacitor on the bottom face will give optimized performance. http://onsemi.com 18 NCP2820 Series Note Figure 46. Top Layer of Two Layers Board Dedicated to the 9-Pin Flip-Chip Package Note: This track between Vp pins is only needed when a 2 layers board is used. In case of a typical 4 or more layers, the use of laser vias in pad will optimize the THD+N floor. The demonstration board delivered by ON Semiconductor is a 4 Layers with Top, Ground, Power Supply and Bottom. Bill of Materials PCB Footprint Manufacturer Part Number R1, R2 0603 Vishay-Draloric CRCW0603 Ceramic Capacitor 100 nF, 50 V, X7R C1, C2 0603 TDK C1608X7R1H104KT 4 Ceramic Capacitor 4.7 F, 6.3 V, X5R C3, C4 0603 TDK C1608X5R0J475MT 5 PCB Footprint J7, J8 6 I/O connector. It can be plugged by MC-1,5/3-ST-3,81 J2 Phoenix Contact MC-1,5/3-G 7 I/O connector. It can be plugged by BLZ5.08/2 (Weidmuller Reference) J1, J3 Weidmuller SL5.08/2/90B 8 Jumper Connector, 400 mils J4 Harwin D3082-B01 9 Jumper Header Vertical Mount 3*1, 2.54 mm. J5 Tyco Electronics / AMP 5-826629-0 Item Part Description Ref 1 NCP2820 Audio Amplifier U1 2 SMD Resistor 150 k 3 NCP2820 http://onsemi.com 19 NCP2820 Series ORDERING INFORMATION Device Marking Package Shipping† NCP2820FCT1 MAQ 9-Pin Flip-Chip CSP 3000 / Tape & Reel NCP2820FCT1G MAQG 9-Pin Flip-Chip CSP (Pb-Free) 3000 / Tape & Reel T1 Orientation NCP2820FCT2G MAQG 9-Pin Flip-Chip CSP (Pb-Free) 3000 / Tape & Reel T2 Orientation NCP2820AFCT2G MBDG 9-Pin Flip-Chip CSP (Pb-Free) 3000 / Tape & Reel T2 Orientation NCP2820MUTBG ZBMG 8 PIN UDFN 2x2.2 (Pb-Free) 3000 / Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. T1 Orientation T2 Orientation Pin 1 (Upper Right) Pin 1 (Upper Left) Die orientation in tape with bumps down Die orientation in tape with bumps down http://onsemi.com 20 NCP2820 Series PACKAGE DIMENSIONS 9 PIN FLIP-CHIP CASE 499AL-01 ISSUE O NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETERS. 3. COPLANARITY APPLIES TO SPHERICAL CROWNS OF SOLDER BALLS. -A- 4X D 0.10 C -B- DIM A A1 A2 D E b e D1 E1 E TOP VIEW A 0.10 C 0.05 C -C- A2 A1 SIDE VIEW SEATING PLANE D1 e C B e E1 A 9X b 1 2 3 0.05 C A B 0.03 C BOTTOM VIEW http://onsemi.com 21 MILLIMETERS MIN MAX 0.540 0.660 0.210 0.270 0.330 0.390 1.450 BSC 1.450 BSC 0.290 0.340 0.500 BSC 1.000 BSC 1.000 BSC NCP2820 Series PACKAGE DIMENSIONS 8 PIN UDFN, 2x2.2, 0.5P CASE 506AV-01 ISSUE B PIN ONE REFERENCE 2X 0.10 C NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. CONTROLLING DIMENSION: MILLIMETERS. 3. DIMENSION b APPLIES TO PLATED TERMINAL AND IS MEASURED BETWEEN 0.25 AND 0.30 mm FROM TERMINAL. 4. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS. A B D ÉÉ ÉÉ ÉÉ E DIM A A1 A3 b D D2 E E2 e K L TOP VIEW 0.10 C 2X (A3) A 0.10 C 8X 0.08 C SEATING PLANE SIDE VIEW MILLIMETERS MIN NOM MAX 0.45 0.50 0.55 0.00 0.03 0.05 0.127 REF 0.20 0.25 0.30 2.00 BSC 1.40 1.50 1.60 2.20 BSC 0.70 0.80 0.90 0.50 BSC 0.20 ----0.35 0.40 0.45 C A1 SOLDERING FOOTPRINT* D2 8X L 4 1 2.15 e 1 E2 8X K 8 5 1.60 8X b BOTTOM VIEW 0.10 C A B 0.05 C NOTE 3 ÇÇ ÇÇ ÇÇ ÇÇ ÇÇ ÇÇ ÇÇÇ ÇÇÇ ÇÇÇ ÇÇÇ ÇÇÇ ÇÇÇ 8X 0.48 0.80 8X 0.25 0.50 PITCH DIMENSIONS: MILLIMETERS *For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. 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. 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