BL6331B 3W Anti-Clip Class-D Audio Power Amplifier Features General Description Output Power BL6331B is a 3-W (VDD=5.0V, RL=4Ω) high efficiency - 3.0W (VDD=5.0V, RL =4Ω, THD+N=10%) filter-free class-D audio power amplifier in a wafer - 1.8W (VDD=5.0V, RL =8Ω, THD+N=10%) chip scale package (WLCSP). Four mode can be selected with CTRL BL6331B has a “Professional Anti-Clip output control terminal: Anti-Clip 1, Anti-Clip 2, Anti-Clip off, circuit” which reducing distortion of output signal due Power-Down to either the over level input signal or power supply Low THD+N and Low Noise voltage down with battery. Low EMI Features like high efficiency, −80dB PSRR, over- Improved PSRR (−80dB) and Wide Supply Voltage (2.5 V to 5.0V) Eliminates Need for a Voltage Regulator Over-current and Thermal Protection function current protection and thermal protection function make the BL6331B ideal for cellular handsets. Typical Application Circuit Pop noise reduction function Available in space-saving package: 9-Bump WLCSP Applications Mobile phone, PDA MP3/4, PMP, GPS Portable electronic devices Pin Description Pin Diagrams A B C 1 2 3 IN+ VDD VO+ PIN # Name GND IN- VREF PGND CTRL A1 IN+ Positive differential input A2 VDD Power Supply A3 VO+ Positive BTL output B1 AGND Analog Ground B2 VREF Bypass capacitor connected B3 PGND Power Ground VO- C1 top view C2 C3 http://www.belling.com.cn Description -1- IN- Negative differential input CTRL Mode select VO- Negative BTL output V1.1 BL6331B Order Information Part Number Package Shipping BL6331B 9-Bump WLCSP 3000 pcs / Tape & Reel Function Block Diagram Absolute Maximum Ratings (Over operating free-air temperature, unless otherwise noted) VDD VI TA TJ TSTG TSLD Supply voltage Input voltage Operation free-air temperate range Operation free-air junction temperature Storage temperature range Soldering temperature -0.3V to 5.2V -0.3V to VDD+0.3V -40°C to 120°C -40°C to 150°C -65°C to 150°C 300°C, 5sec Recommended Operating Conditions Symbol VDD Parameter Power Supply Voltage Conditions MIN 2.5 Ta Operating Ambient Temperature -20 RL Speaker Impedance 4 TYP MAX 5.0 UNIT V 85 °C Ω DC Characteristics (VDD =2.5V to 5 V, Ta =25°C, unless otherwise noted.) Symbol VUVLH VUVLL VMOD1 VMOD2 VMOD3 VMOD4 Parameter Power Supply Start-up threshold voltage Power Supply shut-down threshold voltage Anti-Clip1 mode setting threshold voltage Anti-Clip2 mode setting threshold voltage Anti-Clip off mode setting threshold voltage Power-down mode setting threshold voltage IDD Consumption current IPD VREF Consumption current in power-down mode VREF voltage http://www.belling.com.cn -2- Test Conditions MIN TYP 2.5 1.8 1.3 0.85 0.5 VSS VDD=3.6V, no load, no signal input CTRL<0.2V MAX VDD 1.15 0.72 0.14 5 mA 1 VDD/2 V1.1 UNIT V V V V V V µA V BL6331B AC Characteristics Symbol tSTUP fc tAT1 TRL1 tAT2 TRL2 tMOD (VDD =2.5V to 5V, Ta =25°C, unless otherwise noted.) Parameter Start-up time Input cut-off frequency Attack time 1 Release time 1 Attack time 2 Release time 2 Each mode setting time(Except power down) Test Conditions VDD=5V,Vr=1uF CIN-33nF,Av=17.5dB VDD=5V,g=10dB VDD=5V,g=10dB VDD=5V,g=10dB VDD=5V,g=10dB MIN TYP 38 120 45 3.1 10 1.8 MAX 0.1 UNIT ms Hz ms s ms s ms Analog Characteristics (VDD =3.6V, Av=17.5dB,Ta =25°C, CIN=100nF, Anti-Clip off, unless otherwise noted.) Parameter Test Conditions Symbol f=1KHz, RL=4Ω,VDD=5V Po Maximum output THD+N= RL=8Ω,VDD=5V 10% RL=4Ω, Po =0.65W, f=1KHz THD+N Total Harmonic Distortion Rate RL=8Ω, Po =0.65W, f=1KHz N Residual Noise Av=17.5dB A-Weighted SNR Signal/Noise Ratio Av=17.5dB A-Weighted PSRR Power supply rejection ratio 217Hz RL=8Ω, Po =0. 6W, η Maximum Efficiency RL=8Ω, Po =0. 1W, Vo Output offset voltage CIN=0.1µF, f=100Hz to fRES Frequency characteristics 20KHz Gv Closed Loop Gain VDD=5V Anti-Clip Off MIN TYP 3 W 0.08 % 0.06 % 60 95 -80 85 80 ±10 µVrms dB dB % % mV -3 1 17.5 （Gain=17.5dB,Ta=25°C, Anti-Clip off, CIN=100nF, unless otherwise specified） -3- UNIT W 1.8 Typical Operating Characteristics http://www.belling.com.cn MAX V1.1 dB dB BL6331B http://www.belling.com.cn -4- V1.1 BL6331B Application Information Anti-Clip Control Function This is the function to control the output in order to obtain a maximum output level without distortion when an excess input which causes clipping at the differential signal output is applied. That is, with the Anti-Clip function, BL6331B lowers the Gain of the amplifier to an appropriate value so as not to cause the clipping at the differential signal output. And, BL6331B follows also to the clip of the output wave form due to the decrease in the power-supply voltage. The Attack time and the release time of Anti-Clip control are fixation two levels, and selects with the CTRL terminal. The Attack time is a time interval until from gain falls to target attenuation gain -3dB with a big signal input enough. And the Release time is a time from target attenuation gain to not working of Anti-Clip. Attack time and Release time Anti-Clip mode Attack time Release time 1(Recommendation) 45ms 3.1s 2 10ms 1.8s Over-current Protection function This is the function to establish the over-current protection mode when detecting a short circuit between BL6331B differential output terminal and VSS, VDD, or another differential output. In the over current protection mode, the differential output terminal becomes a high impedance state. Once the short is removed, the device will be reactivated.. Thermal Protection function Thermal protection on the BL6331B prevents damage to the device when the internal die temperature exceeds 150 ℃. There is a ±20℃ tolerance on this trip point from device to device. Once the die temperature exceeds the thermal set point, the outputs are disabled. This is not a latched fault. The thermal fault is cleared once the temperature of the die is reduced by 20℃. The device begins normal operation at this point with no external system intervention. Under Voltage Lock-out (UVLO) The BL6331B incorporates circuitry designed to detect low supply voltage. When the supply voltage drops to 1.8V or below, the BL6331B outputs are disabled, and the device comes out of this state and starts to normal function when VDD ≧2.5V. VREF terminal output The voltage of VDD/2 is output from the VREF terminal. Capacitor (1uF) is connected between the VREF terminal and GND for stabilization. Power down and Initialization function When CTRL terminal is connected to the GND potential, the IC goes to the power-down mode. In the mode, all the circuit functions stop and its current consumption becomes the lowest. when CTRL terminal is set to H level, the power-down mode is canceled and the IC starts up after startup time (tSTUP). In order to return from the power-down mode a desired mode needs to be set after setting both CTRL1 and CTRL2 to H level during tWK. In addition, at startup, cancel the power-down mode after supply voltages has been sufficiently stabilized. http://www.belling.com.cn -5- V1.1 BL6331B CTRL1 CTRL2 Function H H Anti-Clip 1 mode H GND Anti-Clip 2 mode GND H Anti-Clip off mode GND GND Power-down mode CTRL terminal function By connection external resistors (Rctrl1, Rctrl2, and Rctrl3: Accuracy of 1%) to CTRL terminal, and impression setting threshold voltage of each mode to CTRL terminal, the followings can be set: Anti-Clip1, Anti-Clip2, Anti-Clip OFF, and power-down mode. When turning on the supply voltage or cancelling the power-down mode, control the CTRL terminal according to the procedure for cancelling power-down. Connect the terminal to the ground through a capacitor Cctrl (a ceramic capacitor of 0.1µF or more) 1.8V~5.0V Micro Computer CTRL1 Rctrl1 CTRL2 Rctrl2 CTRL Cctrl Rctrl3 0.1uF “H” level indicates a microcomputer’s I/O port H level output voltage that is input to CTRL1 and CTRL2 terminals and GND indicates GND of the microcomputer. GND level of the microcomputer must be the same as that of BL6331B. The control of CTRL terminal is based on I/O port H level output voltage of microcomputer that is connected. Set resistance constants according the I/O port H level output voltage of each microcomputer as shown below. I/O port H level output voltage 1.8V 2.6V 3.0V 3.3V 5.0V Rctrl1 27KΩ 33KΩ 33KΩ 33KΩ 56KΩ Rctrl2 43KΩ 51KΩ 51KΩ 51KΩ 82KΩ Rctrl3 82KΩ 27KΩ 22KΩ 18KΩ 15KΩ of Microcomputer Functions of CTRL pin are designed with their control by two control pins (CTRL1 and CTRL2) http://www.belling.com.cn -6- V1.1 BL6331B Only a Switching control between Anti-Clip1 mode and Power-down is available when a single control terminal used. A setting voltage should be set according to VMOD1 and VMOD4, and use a RC filter with time constant of 1msec or more in order to eliminate noise at transmission side such as Micon etc. (Example. Rctrl1=10KΩ and Cctrl=0.1µF). CTRL1 Function H Anti-Clip 1 mode GND Power-down mode POP and Click Circuitry The BL6331B contains circuitry to minimize click and pops. For the best power-off pop performance, the amplifier should be set in shutdown mode prior to removing the power supply voltage. http://www.belling.com.cn -7- V1.1 BL6331B Package Information P-0.50TYP 1.00 Unit: Millimeter 0.29 0.25 0.620 Max http://www.belling.com.cn -8- V1.1