BL6331 BL6331 MONAURAL 3W Non-Clip DIGITAL AUDIO POWER AMPLIFIER General Description Features Professional non-clip output control function: BL6331 is a 3-W (VDD=5.0V, RL=4Ω) high efficiency Maximum non-clip output filter-free class-D audio power amplifier in a wafer 800mW(VDD=4.2v, RL=8Ω,NC1 mode) chip scale package (WLCSP). Four mode can be selected with CTRL BL6331 has a “Professional non-clip output control terminal: NC1( NonClip1), NC2 (nonClip2), circuit” which reducing distortion of output signal due NC_OFF (NonClip-off), shutdown to either the over level input signal or power supply Maximum output (work in nonclip-off mode) voltage down with battery, 3W（VDD=5.0V, RL=4Ω, THD+N=10%） Features like 88% efficiency, −75dB PSRR, and 0.82W（VDD=3.6V, RL=8Ω, THD+N=10%） improved RF-rectification immunity make the BL6331 THD+N ideal for cellular handsets. In cellular handsets, the 0.06% (VDD = 3.6V, RL=8Ω, PO=0.4W, 1kHZ) earpiece, speakerphone, and melody ringer can each Efficiency With an 8Ω Speaker: be driven by the BL6331. 88% at 400 mW Application Circuit 80% at 150 mW Optimized PWM Output Stage Eliminates LC C1 1.0uF Output Filter Improved PSRR (−75 dB) and Wide Supply Voltage (2.5 V to 5.5 V) Eliminates Need CIN IN+ for a Voltage Regulator CTRL1 Available in space-saving package: CTRL2 VO+ IN- Over-current and Thermal Protection function Low voltage Malfunction prevention function VDD 33nF 33nF differential input Rctrl1 Rctrl2 BL6331 CIN CTRL Cctrl 0.1uF VOVREF AGND 9-bump WLCSP PGND Rctrl3 C2 1.0uF Applications Mobile phone, PDA MP3/4, PMP, GPS Pin Description Portable electronic devices Notice: CTRL terminal function is described in page 4. Pin Diagrams A B C 1 2 3 IN+ VDD VO+ GND IN- VREF PIN # Name PGND CTRL VO- 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 C1 top view C2 C3 http://www.belling.com.cn -1- Description IN- Negative differential input CTRL Mode select VO- Negative BTL output Total 12 Pages BL6331 Function Block Diagram PVDD VDD BL6331 VO+ 33nF IN+ Pre AMP IN- Data precessor & Driver Class D Modulator 33nF 1uF VREF VREF Generator Digtal Controller Internal Oscillator AGND UVP OTP OCD Non-clip Modulator CTRL VO- PGND Description of operating functions &Component Recommended 1、 、 Digital amplifier function BL6331 The BL6311 is a 3-W high efficiency filter-free class-D audio power amplifier in a wafer chip scale package (WLCSP) that requires only four external components. • Use a capacitor (1 μ F or more) with low enough ESR between VDD and GND as a decoupling capacitor. • Use a capacitor (1μF) between VREF and GND to stabilize the VDD/2 Common-mode voltage. • Use a capacitance of 0.1μF or less (e.g. 33nF), ±10% as a DC-cut capacitor (CIN) to reduce pop noise. For a differential input, input signal to IN+ and IN- pins via DC-cut capacitor (CIN). For a singleended input, input a signal to IN+ via DC-cut capacitor (CIN). At this time, IN- pin should be connected to AGND via a DC-cut capacitor (CIN) with the same capacitance. Differential input Zout Singe input CIN CIN Zout IN+ <600ohm 33nF 33nF BL6331 IN- FrontCircuit <600ohm FrontCircuit CIN IN+ 33nF 33nF BL6331 IN- CIN Notice：Please start up the former source circuit first to stabilize the DC bias point and then cancel the shutdown state of BL6331. The time required to stabilize the voltage is decided by CIN, ZOUT of front circuit and the input impedance of BL6331 (28.6K Ω typ.). The cut-off frequency of an input signal is 169Hz at CIN=33nF. 2、 、 Non-clip control Function http://www.belling.com.cn -2- Total 12 Pages BL6331 The non-clip function can control the gain of class-D amplifier to obtain a maximum output level (Po =800mW,VDD=4.2v, RL=8Ω) without distortion. When the output clip which is arisen from the over lever input signal or power supply voltage down with buttery is detected, BL6331 lowers the Gain of the digital amplifier to an appropriate value so as not to cause the clipping at the differential signal output. This is the difference from the traditional AGC (Auto Gain Control) or ALC (Auto Level Control). The non-clip performance is depended on three factors: 1、THNC(the threshold THD+N of non-clip) ：The non-clip output control circuit detects the THD+N of output. When the THD+N of output is up to the threshold THD+N of non-clip (0.5%), the amplifier gain is adjusted. 2、tAT (attack time) ：The time from the output clip is detected to the amplifier gain is adjusted. Normally, attack time is 1ms～100ms。 3、tRT (release time) ：The time from the THD+N of output is lower than THNC to the amplifier gain is back to normal level. Normally, release time is 20ms～5s。 The classic music is in well harmonious with long tAT and tRT. The rock and roll music is in well harmonious with short tAT and tRT. The non-clip performance is shown in the following graph： The attack time and release time of Non-clip control are fixation two levels, and selects with the CTRL terminal. CTRL terminal function BB or MCU CTRL1 Rctrl1 CTRL CTRL2 Rctrl2 C ctrl R ctrl3 0.1uF BL6331 CONFIG 1 of CTRL BB or MCU CTRL R ctrl 10Kohm Cctrl 0.1uF CTRL BL6331 CONFIG 2 of CTRL In CONFIG 1 of CTRL, 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 following can be set: NonClip1, Nonclip2, Nonclip-off, and shutdown mode. http://www.belling.com.cn -3- Total 12 Pages BL6331 CTRL1 CTRL2 Mode H H NonClip1 H GND NonClip2 GND H NonClip-off GND GND SHUTDOWN “H” level indicates a microcomputer’s I/O port H level output voltage. “GND” level indicates a GND level output voltage. According to different “H” level output voltage of microcomputer, different external resistors (Rctrl1、Rctrl2 and Rctrl3) should be taken. Connect the CTRL terminal to the GND through a capacitor Cctrl. “H”level output voltage 1.8V 2.6V 3.0V 3.3V 5.0V of MCU or BB Rctrl1 27kΩ 33KΩ 33KΩ 33KΩ 56KΩ Rctrl2 56KΩ 68KΩ 68KΩ 68KΩ 120KΩ Rctrl3 82KΩ 27KΩ 22KΩ 18KΩ 15KΩ In CONFIG 2 of CTRL, A RC filter with time constant of 1m sec or more is used to eliminate noise at transmission side such as Micon etc. (Example. Rctrl=10kΩ and Cctrl=0.1Μf). Only the following two mode can be set: NonClip1, and shutdown mode. When CTRL1 is “H” level voltage, BL6331 work in NonClip1 mode. When CTRL1 is “L” level voltage, BL6331 work in shutdown mode. Work mode switch When CTRL terminal is connected to GND potential, BL6331 work in “shutdown” mode. The entire circuit function stop and its current consumption becomes the lowest. At startup, the CTRL must be first set to “Nonclip1” mode（ （CTRL1 and CTRL2 is “H” ”）。The shutdown mode is ）。 cancelled and IC starts up after startup time (tstup). Then, by setting the voltage of CTRL1 or CTRL2， ，IC can switch to nonclip2 or nonclip-off MODE. When IC works in shutdown mode, the IC must restart after tSD. The switching of work mode is shown in the following graph. The timing of work mode switch http://www.belling.com.cn -4- Total 12 Pages BL6331 Test Circuit Ci VO+ IN+ Signal input from measurement 30KHz LPF 33nF Vin Ci BL6331 IN- Output to measurement VO VO- 33nF Ctrl signal VREF CTRL GND PGND VDD 0.1uF C1 1uF C2 Power + Supply 1uF BL6331 Test Circuit VO+ 100 47nF VO- VO 100 47nF 30kHz LPF 30-kHz LPF for BL6331 test Notes: 1>. C1 should be placed as close as possible to VDD/GND pad of the device 2>. Ci should be shorted for any Common-Mode input voltage measurement 3>. A 33uH inductor should be used in series with RL for efficiency measurement 4>. The 30 kHz LPF (shown in figure 5) is required even if the analyzer has an internal LPF http://www.belling.com.cn -5- Total 12 Pages BL6331 Absolute Maximum Ratings Item Power supply terminal voltage range Input terminal voltage range（IN+, IN-, CTRL） Allowable dissipation (Ta=25℃) Allowable dissipation (Ta=85℃) Junction Temperature Storage Temperature Symbol V DD V IN P D25 P D85 T JMAX T STG Min. -0.3 Vss-0.3 -50 Max. 6.0 V DD+0.3 1.67 0.67 125 125 Unit V V W W ℃ ℃ Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected. RECOMMENDED OPERATING CONDITIONS Item Symbol Min. Typ. Max. Unit Positive DC Supply Voltage Analog Input Voltage（IN+, IN-, CTRL） Operating Temperature Range Speaker lmpedance VDD VIN TA RL 2.5 0 -40 4 3.6 5.5 VDD 85 V V ℃ Ω Typ. Max. Unit ELECTRICAL CHARACTERISTICS Item Symbol Class D Amplifier performance Maximum output Po （NC_OFF） Total Harmonic Distortion Rate (BW:20kHz) Signal/Noise Ratio (BW:20kHz A-Filter) Power supply rejection ratio Maximum Efficiency Conditions Min. THD+N f=lkHz, RL=4Ω, VDD=5V RL=8Ω,VDD=3.6V THD+N=10% RL=4Ω, Po=0.65W, f=lkHz RL=8Ω, Po=0.4W, f=lkHz 3.0 0.82 0.06 0.06 W W % % SNR PSRR Av=18dB 217Hz 84 -75 dB dB η RL=8Ω, Po=0.6W RL=8Ω, Po=0.15W 88 80 ±5 500 % % mV KHz 18 dB Output offset voltage Frequency characteristics Voltage Gain Vos FSW Quiescent Current IDD VDD=3.6V,no input，no load 2.0 mA Shutdown Current ISD CTRL=0 0.1 uA Input impedance ZI VDD=2.5V to 5.5V AV 28.6 kΩ Nonclip Modulator performance Nonclip maximum attenuation gain Aa Nonclip1 mode setting threshold voltage Nonclip2 mode setting threshold voltage VNC1 1.20 VDD V VNC2 0.8 1.1 V http://www.belling.com.cn -10 -6- dB Total 12 Pages BL6331 Nonclip-off mode setting threshold voltage Shutdown mode setting threshold voltage Attack time of Nonclip1 mode Release time of Nonclip1 mode Attack time of Nonclip2 mode Release time of Nonclip2 mode Wake-up mode setting time Start time (Shutdown release) VNC_OFF 0.36 0.68 V VSD 0 0.14 V tAT1 VDD=3.6V,g=10dB 50 ms tRL1 VDD=3.6V,g=10dB 2.0 s tAT2 VDD=3.6V,g=10dB 14 ms tRL2 VDD=3.6V,g=10dB 1.0 s tWK 6 ms tSTUP 3.5 ms Ta(Min.)=-20℃ 50 ms Ta(Min.)=-30℃ 80 ms 0.1 ms Shutdown setting time TSD Each mode setting time (Except shutdown) tMOD ORDERING INFORMATION Device Marking Package Shipping BL6331CP 6331 CSP9 3000 / Tape & Reel Typical Performance Characteristics Audio Precision +20 +15 d B +10 +5 +0 100m 200m 300m 400m 500m 600m 700m 900m 1 Vrms Sweep Trace Color Line Style Thick Data Axis Comment 1 2 3 4 1 1 1 1 Cyan Green Yellow Red Solid Solid Solid Solid 1 1 1 1 Analyzer.Ratio B Analyzer.Ratio B Analyzer.Ratio B Analyzer.Ratio B Left Left Left Left 8ohm_mode1 no load_mode1 8ohm_mode2 no load_mode2 Figure 1 GAIN VS Input Voltage @NC1(mode1)\NC2(mode2) VDD=3.6V RL=8ohm http://www.belling.com.cn -7- Total 12 Pages BL6331 Audio Precision (3.6v 8ohm) 20 5 1 % 0.1 0.01 0.001 0.0001 100m 200m 300m 400m 500m 600m 800m 1 Vrms Sweep Trace Color Line Style Thick Data Axis Comment 1 2 3 1 1 1 Cyan Green Yellow Solid Solid Solid 1 1 1 Analyzer.THD+N Ratio B Analyzer.THD+N Ratio B Analyzer.THD+N Ratio B Left Left Left mode2 mode1_1 mode1_2 Figure 2 THDN VS Input Voltage @ NC1(mode1)\NC2(mode2) VDD=3.6V RL=8ohm Figure 3 THND VS PO @NC1 VDD=4.2V RL=8ohm http://www.belling.com.cn -8- Total 12 Pages BL6331 Figure 4 THND VS Frequency @NC_OFF RL=4ohm Figure 5 http://www.belling.com.cn THND VS Frequency @NC_OFF RL=8ohm -9- Total 12 Pages BL6331 Figure 6 PSRR VS Frequency @NC_OFF RL=4ohm Figure 7 PSRR VS Frequency @NC_OFF RL=8ohm http://www.belling.com.cn - 10 - Total 12 Pages BL6331 VDD vs Maximum output 4500 Maximum output(mW) 4000 3500 3000 2500 2000 1500 1000 PO NC_OFF PO_NC1 500 0 2.5 3 3.5 4 VDD(V) 4.5 5 5.5 Figure 8 Maximum output VS VDD @ RL=4ohm Efficiency vs Po 1 0.9 Efficiency % 0.8 0.7 0.6 0.5 0.4 0.3 0.2 Vdd=5V Vdd=2.5 0.1 0 0 0.02 0.05 0.1 0.15 0.2 0.25 0.4 0.5 0.6 0.8 1 1.2 Po Figure 9 Efficiency VS Po @ RL=8ohm http://www.belling.com.cn - 11 - Total 12 Pages BL6331 PACKAGE OUTLINE DIMENSIONS CSP9 9 Bump WLCSP Dimensions (mm) REF A1 A2 A3 D D1 E E1 b ccc http://www.belling.com.cn - 12 - MIN 0.215 0.355 0.020 1.485 1.485 0.300 TYP MAX 0.235 0.255 0.380 0.405 0.035 0.050 1.500 1.515 0.500 1.500 1.515 0.500 0.320 0.340 0.080 Total 12 Pages