2 Watt Stereo Class D Audio Power Amplifier with Stereo Headphone Amplifier Literature Number: JAJS693
Boomer 2006 4 A very minor text edit (typo). (MC) Converted to nat2000 DTD. Few edits on Table 1 and art DS101269-03 (Kevin.) reduced block diagram to fit on page one. changed to final 1-7-2000 UPDATED FIGURES AND TABLES FOR PRINT changed graphics 5 to 9 to eps fixed graphic reference New datasheet 2W D D THD ( ) - 32 0.5 THD 80mW D 2 2 A 4 250mW 69 2W 83 IC / / 24 TSSOP THD N ( ) 1 P O 2.1W ( ) 4 1W 1kHz THD N (D ) 0.2 ( ) 2W D 4663 LM Jeff Bridges 20000111 23960 ds101269 32 20mW 1kHz THD N ( ) 0.15 ( ) 4 2W 83 ( ) 4 250mW 69 ( ) 22mA ( ) 2 A ( ) 4.5V 5.5V - 2 / 24 TSSOP ( ) TSSOP Package Boomer 2W D Boomer ( ) Top View Order Number MT See NS Package Number MTC24 (TSSOP Package) 20021104 National Semiconductor Corporation DS101269-06-JP 1
(Note 2) 6.0V 0.3V V DD 0.3V (Note 3) 2.5 ESD (Note 4) 2000V 5 7 18 20 600V ESD (Note 5) 200V 5 7 18 20 50V (Note 6) 150 65 T A 150 TSSOP (60 ) (15 ) (Note 1 2) 215 220 AN-450 (SO) T MIN T A T MAX 40 T A 85 4.5V V DD 5.5V (TSSOP ) JA 80 /W JC 20 /W (Note 1 2 7) V DD 5V R L 4 Figure 1 LC T A 25 2
(Note 1 2 7)( ) V DD 5V R L 4 Figure 1 LC T A 25 Note 1: Note 2: Note 3: Note 4: Note 5: Note 6: Note 7: DC AC (Typ ) 25 150 - JA 80 /W 1.5k100pF 220pF 240pF 150 AOQL (Average Outgoing Quality Level : ) Efficiency vs Output Power Power Dissipation vs Output Power 3
( ) Class D Amplifier In-Band Output Spectrum Class D Amplifier In-Band Output Spectrum Class D Amplifier THD N vs Power vs Frequency Class D Amplifier THD N vs Frequency vs Power Headphone THD N vs Frequency vs Power 4
FIGURE 1. Operating on a single 5V supply, this recommended application circuit is a complete solution with 2W Class D amplifiers that drive 4 speakers and 80mW amplifiers drive 32 headphones. Figure 1 2W 80mW / HPSEL ( ) 3 (INSEL SD HPSEL) INSEL V IN1 V IN2 2 INSEL V IN1 V IN2 SD HPSEL D Table 1 TABLE 1. Function selected when applying V DD or GND to the INSEL, SD, and HPSEL control pins. V D INSEL 10 V IN2 L & R V IN1 L & R SD 9 HPSEL 16 D D 2W D Figure 1 LC 4 18kHz D 5
( ) BYPASS DC AC BYPASS 4 8 17 21 GNDPR THD 2.5 ( ) Table 2 4 8Figure 1 (C) (L) 18kHz TABLE 2. Output filter component values for different load resistance. Load Resistance ( ) Capacitor C ( F) Inductor L ( H) 4 2 22 8 1 44 4.5V 5.5V (SD V DD ) ( 1A) USB Figure 2 Figure 3 Figure 7 4 EMI LC Table 4 (BOM) Figure 8 4 5V 4 32 V DD GND Lout Lout Rout Rout HPL HPR HPL HPR 2 Figure 1 3 1 2 1 Lin1 Rin1 2 Lin2 Rin2 7 2 2 D Table 3 TABLE 3. These are the functions selected by the jumpers on the recommended PC board. SD-L SD-H INSEL-L INSEL-H SD-H SD-L 2 INSEL-H 1 INSEL-L 6
( ) TABLE 3. These are the functions selected by the jumpers on the recommended PC board. ( ) Class AB Class D HP Jack D D HP D AB HP D D AB D (Figure 1 ) FIGURE 2. At power-up, the LP3740 forces the into shutdown, which prevents abnormal quiescent current flow through the amplifier. Once V CC rises above 4V and after a 200ms delay set by C1, normal amplifier operation is restored. FIGURE 3. Recommended PC board layout: Component side silkscreen FIGURE 4. Recommended PC board layout: Component side layout 7
( ) FIGURE 5. Recommended PC board layout: Inner Layer ground plane layout FIGURE 6. Recommended PC board layout: Inner Layer supply plane layout FIGURE 7. Recommended PC board layout: Bottom side layout TABLE 4. Suggested PC Board Bill-of-Materials for recommended PC boards. (See Figures 1 and 3 through 7) 8
( ) FIGURE 8. Recommended PC Board 9
Boomer 2W D millimeters Order Number MT NS Package Number MTC24 (CEO) (GENERAL COUNSEL) a (b) National Semiconductor Copyright 2006 National Semiconductor Corporation www.national.com 135-0042 2-17-16 / TEL.(03)5639-7300
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