2W Stereo Class-D Audio Power Amplifier BA20370 Brief Data Sheet Preliminary Version Rev.1.0, 2005.11.24 Biforst Technology Inc. BA20370 ____ 2W Stereo Class-D Audio Power Amplifier 2W Stereo Class-D Audio Power Amplifier BA20370 GENERAL DESCRIPTION The BA20370 is a 5V class-D amplifier from Biforst Technology. BA20370 provides dc volume control, lower supply current, high efficiency & few external components for driving speaker directly. BA20370 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 4-Ω Speakers (THD+N = 10%@5.7V) Operation Voltage From 3.3 To 5.5V Integrated Anti-Pop Circuitry Integrated Output Short Protection Circuitry Integrated Over-Heat Protection Circuitry Provide DC Volume Control Preliminary Version Operate Voltage vs Output Power 2.40 Output Power Per Channel (W) 2.20 2.00 1.80 1.60 1.40 THD 1%-4Ohm 1.20 THD 10%-4Ohm 1.00 THD 1%-8Ohm 0.80 THD 10%-8Ohm 0.60 0.40 0.20 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 0.00 Operate Voltage (V) Chip List： Chip Name 2W Stereo Class-D Audio Power Amplifier IC No. BA20370 Chip Package HSOP 28 Pin _________________________________________________________________________________________________ Biforst Technology, Inc., reserves the right to change product or specifications without notice. Page 2 of 4 BA20370 ____ 2W Stereo Class-D Audio Power Amplifier PIN ASSIGNMENTS 1 28 PVDD_A PVDD_A 2 27 PVDD_A ROUT_P_0 3 26 LOUT_P_0 ROUT_P_1 4 25 LOUT_P_1 ROUT_N_0 5 24 LOUT_N_0 ROUT_N_1 6 23 LOUT_N_1 PVSS_A 7 22 PVSS_A PVSS_A A A PVSS_A BA20370 PVDD_A VDD 8 21 VDD RINP 9 20 LINP RINN 10 19 LINN C_BYPASS 11 18 OSC_R SHUTDOWN_B 12 17 VOLUME VSS 13 16 OSC_C VSS 14 15 VSS PIN LIST & DESCRIPTION Pin No. Pin 1 PVDD_A 2 PVDD_A 3 ROUT_P_0 4 5 6 I/O Pad Function Type Power 5V power supply for right channel output Preliminary Version ROUT_P_1 ROUT_N_0 ROUT_N_1 Output Right channel positive output Output Right channel negative output Power 5V ground 7 PVSS_A A PVSS_A 8 VDD Power 5V power supply 9 RINP Input Right channel positive differential audio input 10 RINN Input 11 C_BYPASS Input Right channel negative differential audio input Connect a 1-uF capacitor from C_BYPASS to ground for internal bias reference Shunt down control for BA2037, Logic low is placed on this terminal for 12 SHUTDOWN_B Input shunt down mode, Logic high is placed on this terminal for normal operation 13 VSS 14 VSS 15 VSS 16 OSC_C Power 5V ground Input with OSC_C. For proper operation, connect a 220-pF capacitor from A capacitor connected to this terminal sets the oscillation in conjunction OSC_C to ground 17 VOLUME Input 18 OSC_R Input DC volume control for setting the gain on the internal amplifier. The dc 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 _________________________________________________________________________________________________ Biforst Technology, Inc., reserves the right to change product or specifications without notice. Page 3 of 4 BA20370 Pin No. ____ Pin 2W Stereo Class-D Audio Power Amplifier I/O Pad Function Type 19 LINN Input Left channel negative differential audio input 20 LINP Input Left channel positive differential audio input 21 VDD Power 5V power supply 22 PVSS_A Power 5V ground 23 LOUT_N_1 24 LOUT_N_0 Output Left channel negative output 25 LOUT_P_1 26 LOUT_P_0 Output Left channel positive output 27 PVDD_A 28 PVDD_A Power 5V power supply for left channel output PACKAGE DIMENSION HSOP28 Preliminary Version 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] Version History Version Date 1.0 2005.11.24 Page Description First Release _________________________________________________________________________________________________ Biforst Technology, Inc., reserves the right to change product or specifications without notice. Page 4 of 4