2W Stereo Class-D Audio Power Amplifier BA20372 Brief Data Sheet Preliminary Version Rev.1.1, 2006.01.26 Biforst Technology Inc. BA20372 ____ 2W Stereo Class-D Audio Power Amplifier 2W Stereo Class-D Audio Power Amplifier BA20372 GENERAL DESCRIPTION The BA20372 is a 5V class-D amplifier from Biforst Technology. BA20372 provides dc volume control, lower supply current, high efficiency & few external components for driving speaker directly. BA20372 also integrates Anti-Pop, Output Short & Over-Heat Protection Circuitry to increase device reliability. The functionality makes this device ideal for LCD projectors, LCD monitors, powered speakers & other applications that demand more battery life. FEATURE 2W Per Channel Into 3-Ω Speakers (THD+N = 10%@5.6V) Operation Voltage From 3.3 To 5.5V DC Volume Control From –38dB to 20dB Low Shutdown Control : <10μA Low Noise Floor, -80dBV Maximum Efficiency into 3-Ω, 77% Maximum Efficiency into 8-Ω, 87% Preliminary Version PSRR, -71dB Integrated Anti-Pop Circuitry Integrated Output Short Protection Circuitry Integrated Over-Heat Protection Circuitry Provide DC Volume Control 2.80 2.60 2.40 2.20 2.00 1.80 1.60 1.40 1.20 1.00 0.80 0.60 0.40 0.20 0.00 THD 1%-3Ohm THD 10%-3Ohm THD 1%-4Ohm THD 10%-4Ohm THD 1%-8Ohm THD 10%-8Ohm 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6.0 Output Power Per Channel (W) Operate Voltage vs Output Power Operate Voltage (V) _________________________________________________________________________________________________ Biforst Technology, Inc., reserves the right to change product or specifications without notice. Page 2 of 5 BA20372 ____ 2W Stereo Class-D Audio Power Amplifier Chip List： Chip Name 2W Stereo Class-D Audio Power Amplifier IC No. BA20372 Chip Package QFN 32pins LINN OSC_R VOLUME OSC_C SHUTDOWN_B C_BYPASS RINN RINP 24 23 22 21 20 19 18 17 PIN ASSIGNMENTS LINP 25 16 VDD VDD 26 15 VSS VSS 27 14 VSS 13 VSS 12 PVSS_A BA20372 5x5x0.8mm VSS 28 PVSS_A 29 PVSS_A 30 11 PVSS_A PVSS_A 31 10 PVSS_A PVSS_A 32 9 PVSS_A 1 2 3 4 5 6 7 8 LOUTN LOUTP PVDD_A PVDD_A PVDD_A PVDD_A ROUTP ROUTN (Top View) Preliminary Version PIN LIST & DESCRIPTION Pin No. Pin I/O Pad Function Type 1 LOUTN Output Left channel negative output 2 LOUTP Output Left channel positive output 3 PVDD_A 4 PVDD_A 5 PVDD_A Power 5V power supply 6 PVDD_A 7 ROUTP Output Right channel positive output 8 ROUTN Output Right channel negative output 9 PVSS_A Power 5V ground Power 5V ground 10 PVSS_A 11 PVSS_A 12 PVSS_A 13 VSS 14 VSS 15 VSS 16 VDD Power 5V power supply 17 RINP Input Right channel positive differential audio input 18 RINN Input Right channel negative differential audio input 19 C_BYPASS Input Connect a 1-uF capacitor from C_BYPASS to ground for internal bias reference _________________________________________________________________________________________________ Biforst Technology, Inc., reserves the right to change product or specifications without notice. Page 3 of 5 BA20372 Pin No. Pin ____ 2W Stereo Class-D Audio Power Amplifier I/O Pad Function Type Shut down control for BA20372, Logic low is placed on this terminal for 20 SHUTDOWN_B Input shut down mode, Logic high is placed on this terminal for normal operation A capacitor connected to this terminal sets the oscillation in conjunction 21 OSC_C Input with OSC_C. For proper operation, connect a 220-pF capacitor from OSC_C to ground DC volume control for setting the gain on the internal amplifier. The dc 22 VOLUME Input 23 OSC_R Input 24 LINN Input Left channel negative differential audio input 25 LINP Input Left channel positive differential audio input 26 VDD Power 5V power supply 27 VSS 28 VSS Power 5V ground 29 PVSS_A 30 PVSS_A 31 PVSS_A Power 5V ground 32 PVSS_A voltage range is 0 to VDD A resistor connected to this terminal sets the oscillation in conjunction with OSC_R. For proper operation, connect a 120-kΩ resistor from OSC_R to ground PACKAGE DIMENSION QFN 32 Preliminary Version _________________________________________________________________________________________________ Biforst Technology, Inc., reserves the right to change product or specifications without notice. Page 4 of 5 BA20372 Symbol ____ 2W Stereo Class-D Audio Power Amplifier Dimension (mm) Min. Nor. Max. A 0.70 0.75 0.80 A1 0 0.02 0.05 C 0.20 REF b 0.18 D 0.25 0.30 5.00 BSC D2 1.25 E 2.70 3.25 5.00 BSC E2 1.25 e 2.7 3.25 0.50 BSC L 0.30 y 0.40 0.50 0.10 CONTACT INFORMATION Biforst Technology Inc. 8F-3, No.26, Tai Yuen St., Jubei City, Hsin-Chu, Taiwan, R.O.C. Tel: 886-3-552-6521; Fax: 886-3-552-6558; Email: [email protected] Preliminary Version Version History Version Date 1.0 2005.12.14 1.1 2006.01.26 Page Description First Release 2 Add features of DC Volume Control, Low Shutdown Control, Low Noise Floor, Max. Efficiency & PSRR. Update Graph “Output Voltage vs. Output Power” _________________________________________________________________________________________________ Biforst Technology, Inc., reserves the right to change product or specifications without notice. Page 5 of 5