BL6281SO-R

BL6281 1.1 Watt Audio Power Amplifier Features








Improved PSRR at 217 Hz & 1 KHz 60 dB Power output at 5.0V, 1% THD+N, 8Ω 1.1 W (typ.) Ultra low shutdown current 0.1 uA (typ.) 2.2V – 5.5V operation Improved circuitry eliminates pop-click noise during turn-on and turn-off transitions No output coupling capacitors, snubber networks or bootstrap capacitors required Unity-gain stable External gain configuration capability Packages: MSOP8、SOP8 General Description The BL6281 is a Class-AB audio power amplifier designed for mobile phone, MID and other portable communication devices. It is capable of delivering 1.1 watts of continuous average power to an 8Ω BTL load with less than 1% distortion (THD+N) from a 5VDC power supply. The BL6281 was designed specifically to provide high quality output power with a minimal amount of external components. It does not require output coupling capacitors or bootstrap capacitors. And with ultra low shutdown current, the BL6281 is ideally suited for mobile phone , MID and other low voltage applications where minimal power consumption is a primary requirement. With special pop-click eliminating circuit, the BL6281 provides perfect pop-click characteristic during turn-on and turn-off transitions. The BL6281 is unity-gain stable and can be configured by external gain-setting resistors. Applications



MID Wireless handsets Portable electronic devices PDAs, Handheld computers http://www.belling.com.cn -1- V1.0 BL6281 Pin Diagrams Pin Description No. Pin Name 1 I/O I Description Shut-down Logical Control, ‘0’ is active. 2 BP I/O 3 INP I Positive Input 4 INN I Negative Input 5 Vout1 O Negative BTL Output 6 VDD I/O Power Supply (2.2 – 5.5 V) 7 GND I/O Ground 8 Vout2 O Positive BTL Output http://www.belling.com.cn Analog ground for inner OPAs. It’s about a half of VDD. -2- V1.0 BL6281 Typical Application Circuit Rf = 20 kΩ Audio In Ri = 20 kΩ INN Vout1 Ci = 0.39 µF 20 kΩ INP 20 kΩ RL Vout2 BIAS VDD VDD Cs = 1 µF GND Pop-Click Cb = 1 µF BP Temp_Prt SHD Shudown Control FIGURE 1. BL6281 Typical Application Circuit Rf = 20 kΩ Ci = 0.39 µF Ri = 20 kΩ INN Vout1 Audio In 20 kΩ INP Ci = 0.39 µF Ri = 20 kΩ 20 kΩ RL 20 kΩ Vout2 BIAS VDD VDD Temp_Prt Cs = 1 µF GND Pop-Click Cb = 1 µF BP SHD Shudown Control FIGURE 2. BL6281 Differential Amplifier Configuration http://www.belling.com.cn -3- V1.0 BL6281 External Components Description Components Functional Description Ri Inverting input resistance which sets the closed-loop gain in conjunction with Rf. This resistor also forms a high pass filter with Ci at fc = 1/(2πRi*Ci). Ci Input coupling capacitor which blocks the DC voltage at the amplifiers input terminates. Also creates a high-pass filter with Ri at fc = 1/(2πRi*Ci). Rf Feedback resistance which sets the closed-loop gain in conjunction with Ri. The gain is AVD=2*(Rf/Ri). Cs Supply bypass capacitor which provides power supply filtering. Cb Bypass pin capacitor which provides half-supply filtering. Refer to the section. Absolute Maximum Ratings Operating Ratings Supply Voltage -0.3V to 6V Input Voltage -0.3V to VDD+0.3V Power Dissipation See Dissipation Rating Table Junction Temperature -40℃ to +150℃ Storage Temperature -65℃ to +150℃ Thermal Resistance θJC(MSOP8) 56℃/W θJA(MSOP8) 190℃/W θJA(SOP8) 184℃/W Temperature Range Supply Voltage -40℃≦TA≦85℃ 2.2V≦VDD≦5.5V NOTE: Absolute Maximum Ratings indicate limits beond which damage to the device may occur. Operating Rating indicate conditions for which the device is functional, but do not guarantee specific performance limits. Electrical Characteristics The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for TA = 25℃.
VDD = 5V Symbol Parameter IDD Quiescent Power Supply Current ISD Shutdown Current http://www.belling.com.cn Conditions Spec Min. Typ. Max. Units VIN = 0V, 8Ω Load 3.0 8 mA VIN = 0V, No Load 2.5 7 mA 0.1 2 uA VIN=0V, VSHD=GND, No Load -4- V1.0 BL6281 VSDIH Shutdown Voltage Input High VSDIL Shutdown Voltage Input Low VOS 1.2 Output Offset Voltage -50 THD+N Total Harmonic Distortion+Noise Po=0.5Wrms, PO Output Power f=1KHz, f=1KHz, THD+N