HT8691RSPER

HT8691R 内置 BOOST 升压 D/AB 类音频功率放大器 内置BOOST升压和防破音功能的11W D/AB类音频功率放大器 ◼ 特点 ・小尺寸LCD电视/监视器 ◼ 概述 ・防削顶失真功能(防破音, Anti-Clipping Function, ACF) ・免滤波器数字调制，直接驱动扬声器 ・输出功率 9.0W (VBAT=3.7V, PVDD = 7.5V, RL=3Ω, THD+N=10%) 11.0W (VBAT=3.7V, PVDD = 7.5V, RL=2Ω, THD+N=10% 5.5W (VBAT=3.7V, PVDD = 6.5V, RL=4Ω, THD+N=10%) 3.15W (VBAT=3.7V, PVDD = 7.5V, RL=8Ω, THD+N=1%) ・电源 -升压输入VBAT：2.5V至5.5V -升压输出PVDD：VBAT至7.5V ・BOOST输出电压可调 ・AB/D类可切换 ・保护功能:过流/过热/欠压异常保护功能 ・无铅封装， SOP8L-PP HT8691R是一款内置BOOST升压模块的D类音 频功率放大器。内置的BOOST升压模块可通过外置 电阻调节升压值，即使是锂电池供电，在升压至7.5V， 2Ω负载条件下则能连续输出11W功率。其支持外部 设置调节BOOST输出电压。 HT8691R的最大特点是防削顶失真（ACF）输 出控制功能，可检测并抑制由于输入音乐、语音信号 幅度过大所引起的输出信号削顶失真（破音），也能 自适应地防止在BOOST升压电压下降所造成的输出 削顶，显著提高音质，创造非常舒适的听音享受，并 保护扬声器免受过载损坏。同时芯片具有ACF-Off 模 式。 HT8691R具有AB类和D类的自由切换功能，在 受到D类功放EMI干扰困扰时，可随时切换至AB类音 频功放模式。 HT8691R内部集成免滤波器数字调制技术，能 够直接驱动扬声器，并最大程度减小脉冲输出信号的 失真和噪音。输出无需滤波网络，极少的外部元器件 节省了系统空间和成本，是便携式应用的理想选择。 ◼ 应用 ・蓝牙音箱 ・2.1声道小音箱 ・iphone/ipod/ipod docking ・平板电脑，笔记本电脑 ・便携式游戏机 ・便携式音箱 ・扩音器 ・MP4, 导航仪 ・智能手机 此外，HT8691R内置的关断功能使待机电流最 小化，还集成了输出端过流保护、片内过温保护和电 源欠压异常保护等功能。 ◼ 典型应用图 Dx 10 µF Battery 1 µF 2 470 µF LX HT8691R PVDD 3 1µF 10 µF 470 µF Rd1 1Ω FB 1nF 1 Rd2 CTRL 1KΩ 8 CIN R IN 6 CIN R IN 7 版权所有©2019, 嘉兴禾润电子科技有限公司 3.3nF 9-GND IN+ OUT+ IN- OUT- -1- 5 4 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier ◼ 引脚信息 FB LX PVDD 1 8 2 7 9-GND 3 CTRL IN- 6 IN+ 4 5 OUT- OUT+ SOP8L-PP Top View ◼ 引脚定义1 SOP Terminal No. 1 2 3 4 5 6 7 8 9 Name I/O ESD Protection FB LX PVDD OUTOUT+ IN+ INCTRL GND2 I I Power O O I I I GND PN PN PN PN PN PN Function 升压反馈点 升压整流管输入 升压输出和功率电源 输出负端l(BTL-) 输出正端(BTL+) 输入正端 (differential +) 输入负端 (differential -) 模式控制输入端 电源地 ◼ 订货信息 1 2 产品型号 封装形式 顶面标记 工作温度范围 包装和最小起订量 HT8691RSPET SOP8L-PP HT8691RSP -40℃～85℃ 料管 /100颗 HT8691RSPER SOP8L-PP HT8691RSP -40℃～85℃ 编带 / 2500颗 I: 输入端 O: 输出端 请确保 GND 脚连接至电源地。. Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -2- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier 11W Anti-Clipping Mono Class D/AB Audio Amplifier with Boost Converter ◼ FEATURE ・LCD TV/Monitor ・Anti-Clipping Function (ACF) ◼ GENERAL DESCRIPTION HT8691R integrates a boost converter with a filter-less stereo class D audio power amplifier to provide 11W continuous power into a 2Ω speaker when operating from a Li-battery voltage boosted to 7.5V. Meanwhile, the boost output voltage is adjustable. HT8691R features Anti-Clipping Function (ACF) which detects output signal clip due to the over input signal and suppresses the output signal clip automatically. Also, the ACF function can adapt the output clip caused by power supply voltage down with battery. It can significantly improve the sound quality, creating a very comfortable musical enjoyment, and to protect the speakers from overload damage. It also supplies ACF OFF mode. Class AB amplifier mode is also available for HT8691R. Once the EMI Interference from class D and Boost Converter becomes an annoying problem, HT8691R can be changed into Class AB mode. HT8691R has a filter-less modulation circuit which directly drives speakers while realizes low distortion and low noise characteristics. Thanks to filter-less, circuit design with fewer external parts can be made in portable applications. HT8691R has the independent Shutdown function which can minimize the power consumption at standby and MUTE function. As for protection function, over current protection function for speaker output terminals, over temperature protection function, and low supply voltage malfunction preventing function are also prepared. ・Filter-less Modulation, Eliminating Output Filter ・Output Power 9.0W (VBAT=3.7V, PVDD = 7.5V, RL=3Ω, THD+N=10%) 11.0W (VBAT=3.7V, PVDD = 7.5V, RL=2Ω, THD+N=10% 5.5W (VBAT=3.7V, PVDD = 6.5V, RL=4Ω, THD+N=10%) 3.15W (VBAT=3.7V, PVDD = 7.5V, RL=8Ω, THD+N=1%) ・Power Supply -Boost Input VBAT：2.5V to 5.5V -Boost Output PVDD：VBAT to 7.5V ・Adjustable BOOST Output Voltage ・Class AB / Class D ・Over Current Protection, Thermal Protection, Low voltage malfunction prevention function included ・Pb-Free Packages , SOP8L-PP ◼ APPLICATIONS ・Bluetooth Speakers ・Portable Speakers ・2.1 Channel Speakers ・Megaphone ・iphone/ipod/ipod docking ・MP4/GPS ・Tablet PC/Note Book ・Smart Phones ・Portable Gamers ◼ TYPICAL APPLICATION Dx 10 µF Battery 1 µF 2 470 µF LX HT8691R PVDD 3 1µF 10 µF 470 µF Rd1 1Ω FB 1nF 1 Rd2 CTRL 1KΩ 8 CIN R IN 6 CIN R IN 7 Copyright ©2019, Jiaxing Heroic Technology Co., Ltd 3.3nF 9-GND IN+ OUT+ IN- OUT- -3- 5 4 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier ◼ TERMINAL CONFIGURATION FB LX PVDD 1 8 2 7 9-GND 3 CTRL IN- 6 IN+ 4 5 OUT- OUT+ SOP8L-PP Top View ◼ TERMINAL FUNCTION 1 SOP Terminal No. 1 2 Name I/O ESD Protection FB LX I I PN - 3 PVDD Power PN 4 5 6 7 8 9 OUTOUT+ IN+ INCTRL GND2 O O I I I GND PN PN PN PN Function Regulator Feedback Input Internal Switch Input Boost Converter Output Voltage and Power Supply Negative Output Terminal (BTL-) Positive Output (BTL+) Positive Input Terminal (differential +) Negative Input Terminal (differential -) Mode Control Terminal Power Ground ◼ ORDERING INFORMATION 1 2 Part Number Package Type Marking Operating Temperature Range MOQ/Shipping Package HT8691RSPET SOP8L-PP HT8691RSP -40℃～85℃ 100PCS / Tube HT8691RSPER SOP8L-PP HT8691RSP -40℃～85℃ 2500PCS / Tape and Reel I: Input O: Output Do make sure that the GND pin is grounded into the Ground plane connecting into the power ground. Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -4- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier ⚫ ELECTRICAL CHARACTERISTIC ⚫ Absolute Maximum Ratings1 Item BOOST converter output voltage and Power supply voltage range Input terminal voltage range (IN+, IN-) Symbol Min. Max. Unit PVDD -0.3 7.8 V VIN －0.6 PVDD＋0.6 V Input terminal voltage range (except IN+, IN-) VIN －0.3 PVDD＋0.3 V Operating Ambient Temperature TA -40 85 ℃ Junction Temperature TJ -40 150 ℃ Storage Temperature TSTG -50 150 ℃ ⚫ Recommended Operating Condition Item BOOST converter output voltage and Power supply voltage range2 Operating Ambient Temperature Symbol Conditions PVDD Ta Speaker Impedance RL Min. Typ. Max. Unit VBAT 6.5 7.5 V -40 25 85 ℃ SOP8L-PP Ω 4 ⚫ Electrical Specification3 Item BOOST Converter Boost converter output voltage Boost converter frequency Boost converter input current limit Item Symbol Conditions PVDD Min. Typ. Max. Unit VBAT 6.5 7.5 V fSW 410 kHz ILIMTRIP 5 A Symbol Conditions Min. Typ. Max. Unit Class D Channel VSS=0V, VBAT =3.7V, RIN = 0ohm, Ta=25ºC, CIN=2.2uF, ACF-Off mode, unless otherwise specified Carrier clock frequency fPWM Over current protection Imax System Gain Start-up time (power-on or shutdown release) ACF attenuation gain Consumption current in shutdown mode Total Harmonic Distortion plus Noise Av0 410 kHz 6 External RIN=0Ω tSTUP Aa A 28 dB 130 ms -16 0 dB ISD CTRL=VSS 7 µA THD+N PO=1.0W, RL=4Ω, f=1kHz 0.10 % Output Noise VN f=20Hz~20kHz, A weighted, Av=28dB 135 µVrms Output offset voltage VOS ±2 mV Quiescent current IBAT 20 mA 20 mA No Load With Load4 Input Grounded, PVDD = 6.5V 1 Absolute Maximum Ratings is values which must not be exceeded to guarantee device reliability. With a system in which supply voltage might exceed supply voltage of PVDD/GND, external diodes are recommended to be used to assure that the voltage does not exceed the absolute maximum rating 2 The rising time of PVDD should be more than 1µs. 3 Depending on parts and pattern layout, characteristics may be changed. 4 4ohm resistor and 22uH coil are used as an output load in order to simulate a speaker. Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -5- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier Item Symbol Conditions Min. Typ. Max. Class D Channel PVDD = 6.5V VSS=0V, VBAT =3.7V, RIN = 0ohm, Ta=25ºC, CIN=2.2uF, ACF-Off mode, unless otherwise specified RL=4Ω 5.5 V BAT =3.7V, RL=3Ω 7 f=1kHz, RL=2Ω+33uH 9 THD+N=10% Output Power PO RL=8Ω 3.1 RL=4Ω 4.4 RL=3Ω, RL=2Ω+33uH Efficiency (Class D + Boost) η VBAT=3.7V, f=1kHz, THD+N=1% RL=8Ω VBAT=4.2V, RL=4Ω, THD+N = 10% VBAT=4.2V, RL=3Ω, THD+N = 10% VBAT=4.2V, RL=2Ω+33uH, THD+N = 10% VBAT=4.2V, RL=8Ω+33uH, THD+N = 10% W 5.5 5.5 2.5 75 % 70 % 66 % 80 % Item Symbol Conditions Min. Typ. Max. Class D Channel PVDD = 7.0V VSS=0V, VBAT =3.7V, RIN = 0ohm, Ta=25ºC, CIN=2.2uF, ACF-Off mode, unless otherwise specified RL=4Ω 6.2 VBAT=3.7V, RL=3Ω Output Power PO RL=2Ω+33uH RL=4Ω RL=3Ω, Efficiency (Class D + Boost) η f=1kHz, THD+N=10% VBAT=3.7V, f=1kHz, THD+N=1% RL=2Ω+33uH VBAT=4.2V, RL=4Ω, THD+N = 10% VBAT=4.2V, RL=3Ω, THD+N = 10% VBAT=4.2V, RL=2Ω+33uH, THD+N = 10% Efficiency (Class D + Boost) η Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -6- Unit 7.6 9.5 W 5.1 6.2 7.5 73 % 69 % 66 % Item Symbol Conditions Min. Typ. Max. Class D Channel PVDD = 7.5V VSS=0V, VBAT =3.7V, RIN = 0ohm, Ta=25ºC, CIN=2.2uF, ACF-Off mode, unless otherwise specified RL=8Ω 3.9 VBAT=3.7V, RL=4Ω 7 f=1kHz, RL=3Ω 9 THD+N=10% RL=2Ω+33uH 11 Output Power PO RL=8Ω 3.15 V BAT =3.7V, RL=4Ω 5.5 f=1kHz, RL=3Ω, 7 THD+N=1% RL=2Ω+33uH VBAT=4.2V, RL=8Ω, THD+N = 10% VBAT=4.2V, RL=4Ω, THD+N = 10% VBAT=4.2V, RL=3Ω, THD+N = 10% VBAT=4.2V, RL=2Ω+33uH, THD+N = 10% Unit Unit W 8.8 82 72 % 68 66 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier Class AB Channel 1 VSS=0V, VBAT =3.6V, CIN = 2.2uF, RIN = 0ohm, Ta=25ºC, CIN=0.1uF, unless otherwise specified RL=4Ω, 1.3 W VBAT=3.6V RL=4Ω, f=1kHz, 1.8 VBAT=4.2V THD+N=10% RL=4Ω, 2.65 W VBAT=5.0V Output Power PO RL=4Ω, 1.0 W VBAT=3.6V RL=4Ω, f=1kHz, 1.5 W VBAT=4.2V THD+N=1% RL=4Ω, 2.1 W VBAT=5.0V PO=0.01W 0.1 % Total Harmonic RL=4Ω, THD+N Distortion plus Noise f=1kHz PO=0.1W 0.09 % Output Noise VN f=20Hz~20kHz, A weighted Signal to Noise Ratio SNR A weighted, THD+N = 1% Output offset voltage VOS η Efficiency Quiescent current IBAT System Gain Start-up time (power-on, shutdown release, or switch from Class D to Class AB) Av0 Item 60 92 dB ±4 mV RL=4Ω+22uH, THD+N = 10% 70 % RL=8Ω+33uH, THD+N = 10% 74.5 % 20 mA 20 mA 22 dB 130 ms No Load With Load Input Grounded External RIN=0Ω tSTUP Symbol µVrms Conditions CTRL Terminal Voltage ACF Off (Class D, Boost On) mode setting VMOD1 threshold voltage ACF-1 (Class D, Boost On) mode setting VMOD2 threshold voltage ACF Off (Class AB, Boost Off) mode setting VMOD3 threshold voltage2 SD mode setting VMOD4 threshold voltage SD wake up voltage VCTRL_ON Min. Max. Unit 2.4 VBAT V 1.6 2.2 V 0.4 1.4 V VSS 0.2 V 0.8 Typ. 1.0 V Internal pull-down Resistor of CTRL RCTRL 300 KΩ MISCELLANEOUS VBAT start-up threshold voltage VBAT shut-down threshold voltage VUVLH 2.5 V VUVLL 2.0 V 1 In Class AB amplifier mode, boost converter is shutdown automatically. Due to the schottky rectifier, the voltage of PVDD terminal can be lower than VBAT, depending on the forward voltage of the rectifier VF. 2 ACF ON mode is only available in Class D amplifier mode. Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -7- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier ◼ TYPICAL OPERATING CHARACTERISTICS Class D Channel Condition: Class D mode, VBAT = 3.7V, fIN = 1kHz, CIN = 2.2uF, external RIN = 0ohm, ACF off, unless otherwise specified PVDD = 7.5V, Load = 4ohm Output Power vs THD+N fIN vs THD+N Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -8- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier Audio Precision PVDD = 7.5V, Load = 8ohm 12/29/20 09:45:40 20 10 5 2 1 % 0.5 0.2 0.1 0.05 0.02 0.01 10m 20m 50m 100m 200m 500m 1 2 5 W Audio Precision Sweep 11 12/29/20 10:04:05 Trace Color Line Style Thick Data Axis 1 Red Solid 2 Analyzer.THD+N Ratio A Left 5 Po vs THD+N.ats2 0.9 % Comment 4.5 0.8 4 0.7 3.5 0.6 3 0.5 2.5 0.4 2 0.3 W 1.5 0.2 1 0.1 500m 20 50 100 200 500 1k 2k 5k 10k 20k Hz Sweep Trace Color Line Style Thick Data Axis 1 1 1 2 Red Green Solid Solid 2 2 Analyzer.THD+N Ratio A Analyzer.Level A Left Right Comment f vs THD+N.ats2 Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -9- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier PVDD = 7.5V, Load = 3ohm Output Power vs THD+N fIN vs THD+N Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -10- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier PVDD = 7.5V, Load = 2ohm+33uH Output Power vs THD+N fIN vs THD+N Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -11- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier PVDD = 7.0V, Load = 4ohm Output Power vs THD+N fIN vs THD+N Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -12- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier PVDD = 7.0V, Load = 3ohm Output Power vs THD+N fIN vs THD+N Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -13- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier PVDD = 7.0V, Load = 2ohm+33uH Output Power vs THD+N fIN vs THD+N Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -14- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier Frequency Respond Input Voltage Level vs Output Voltage Level (PVDD = 7.5V, Load = 4ohm) Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -15- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -16- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -17- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -18- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier Class AB Channel Condition: Class AB mode, VBAT = 3.7V, fIN = 1kHz, CIN = 2.2uF, external RIN = 0ohm, Load = 4ohm, unless otherwise specified Load = 4ohm Output Power vs THD+N fIN vs THD+N Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -19- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier Load = 3ohm Output Power vs THD+N fIN vs THD+N Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -20- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier Load = 2ohm+33uH Output Power vs THD+N fIN vs THD+N Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -21- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier Frequency Respond (RIN = 0ohm) Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -22- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -23- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier ◼ APPLICATION INFORMATION ⚫ BOOST Converter (1) Setting Output Voltage The output voltage is set by a resistive voltage divider from the output voltage to FB terminal, which is shown below. The output voltage can be calculated by PVDD = 1.24*(Rd1+Rd2)/Rd2. Cd2 Rd1 PVDD Rd2 FB Fig. 1 FB Terminal Configuration Some typical output voltages can be got by following settings. Table 1. Output Voltage Setting PVDD 5.0V 6.5V 7.0V 7.5V Rd1 510K 510K 510K 510k Rd2 165K 120K 110K 100k Cd2 3.3nF 3.3nF 3.3nF 3.3nF (2) LX Terminal It is strongly recommended to place an RC circuit from the terminal of LX to Ground, shown as following, so that the ripple current of Boost Converter can be decreased. Meanwhile, the total consumption current of the system will be larger so that the efficiency of the system will be lower. Specifications in this file is measured under the condition with RC. Notes: RC should be placed as closely to LX pin as possible. LX RLX 1Ω CLX 1nF Fig. 2 LX Terminal Configuration (3) Capacitor Selection The input and output capacitor (CIN and COUT) is required to maintain the DC voltage. Low ESR capacitors are preferred to reduce the output voltage ripple. 1uF//10uF//220uF (paralleled) is highly recommended to be placed in both input and output terminal as closely to the pin as possible. If possible, 470uF is better than 220uF. (4) Inductor Selection The inductor is selected based on different conditions. Normally, L≥2.2uH, DCR 12V, VFM＜0.5V, and do make sure that IF is higher than the maximum current of output power supply. (6) Layout Consideration Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -24- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier 1. The power traces, consisting of the GND, LX, VBAT and PVDD trace should be kept short, direct, wide, and as closely to the pin as possible. The switching node LX should be paid more attention for EMI and reliability consideration. 2. Place CIN and COUT near VBAT and PVDD as closely as possible to maintain voltage steady, and filter out the pulsing current. 3. The resistive divider R should be connected to pin directly as closely as possible. FB is a sensitive node. Please keep it away from switching node, LX. 4. The GND of the IC, CIN and COUT should be connected close together directly to ground plane. ⚫ Analog Signal Input Configuration HT8691R is an amplifier with analog input (single-ended or differential). For a differential operation, input signals into IN+ and IN- pins via DC-cut capacitors (CIN) and external input resistors RIN. The input signal gain is calculated by Gain  RF (External RIN +Internal RIN ) . And the high pass cut-off frequency of input signal can be calculated by . For a single-ended operation, input signals to IN+ pin via a DC-cut capacitor (CIN) and external input resistor (RIN). IN- pin should be connected to ground via a DC-cut capacitor and external input resistor (RIN) (with the same value of CIN and RIN). The Gain and high pass Cut-off frequency are the same as the above case. Table. 2 Internal input resistors and feedback resistors Working Mode Class D mode Class AB mode Front Circuit Internal RIN(ohm) 17.8k 17.8k Front Circuit HT8691R IN+ ZOUT CIN External RIN RF(ohm) 450K 225K HT8691R IN+ ZOUT Internal RIN CIN External RIN IN- Internal RIN IN- Fig. 3 (1) Differential Input; (2) Single-ended Input ⚫ Output Configuration As mentioned, HT8691R can directly drive speakers without any other components. But there are exceptions. Once HT8691R works in class D mode, the cable lined to the speaker is very long, and EMI is concerned, ferrite beads or L-C filter is needed. ⚫ CTRL Terminal Mode Control HT8691R can work in different modes by setting the CTRL terminal, shown as follow. Table. 3 CTRL Terminal Mode Control MODE SYMBOL Class D mode in ACF-Off with Boost Converter Class D mode in ACF-ON with Boost Converter Class AB mode in ACF-Off without Boost Converter SD(Shutdown) Mode MIN. CTRL Voltage TYP. MAX. UNIT VMOD1 2.4 VBAT V VMOD2 1.6 2.2 V VMOD3 0.4 1.4 V VMOD4 VSS 0.2 V Notes: ACF-ON mode can only be worked in class D mode. A 300kΩ pull-down resistor are inside of the CTRL terminal, shown as follows. Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -25- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier HT8691 300KΩ CTRL Fig. 4 CTRL Terminal HT8691R can only be turned into operation from shutdown mode when the voltage of CTRL is higher than 0.8V (1.0V is recommended). ⚫ Anti-Clipping Function (ACF) and mode Configuration (1) ACF ON Mode In ACF-ON modes, HT8691R attenuates system gain to an appropriate value when an excessive input is applied, so as not to cause the clipping at the differential signal output. In this way, the output audio signal is controlled in order to obtain a maximum output level without distortion. And HT8691R also follows to the clips of the output waveform due to the decrease in the power-supply voltage. (1) Excessive Inputs Input Initial Gain Av0 Total Gain ACF ON Peak - Av=Av0+Aa Attack Time Excessive Inputs Peak + Clipping Detection Release Time ACF OFF Peak + ACF Attenuation Gain Peak - -10dB≤Aa≤0 (2) Appropriate inputs Initial Gain Av0 Power Supply Decreasing Total Gain ACF ON + + PVDD Decrease - Av=Av0+Aa Clipping Detection Attack Time Release Time ACF Attenuation Gain -10dB≤Aa≤0 Fig. 5 the ACF Function Operation Outline The Attack time of ACF Function is a time interval until system gain falls to target attenuation gain -3dB when a big enough signal input. And, the Release Time is a time from target attenuation gain to not working of ACF. The maximum attenuation gain is 16dB. Table 4 Attack time and Release time ACF mode ACF ON (2) ACF OFF Mode Attack time Release time 50ms 64ms In ACF-Off mode, ACF function is disenabled. HT8691R will not detect output clipping and the system gain is kept to be Av=Av0. The audio quality would worsen due to clipping distortion. (3) Class AB mode HT8691R works as Class AB audio Amplifier in ACF off mode, the boost converter is disenabled. Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -26- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier (4) SD Mode In shutdown mode, HT8691R shuts all circuit down and minimizes the power consumption. And, the output terminals become Weak Low (A high resistance grounded state). ⚫ Pop-Click Noise Reduction The Pop-Click Noise Reduction Function of HT8691R works in the cases of Power-on, Power-off, Shutdown on, and Shutdown off. To achieve a more excellent noise reduction performance, it is recommended to use a DC-cut capacitor (CIN) of 0.1µF or less. Besides, POP noise can be minimal according to the following procedure of shutdown control. ・During power-on, Shutdown mode is not cancelled until the power supply is stabilized enough. ・Before Power-off, set Shutdown mode first. The pop-click noise: Power-on/-off > Shutdown on/off. tDELAY>tSTUP VBAT tDELAY>50ms VUVLH VUVLL ACF-Off ACF-On ClassAB CTRL SD tSTUP OUT Power off SD Operation SD Power off Fig. 6 Pop-Click Noise Reduction by Shutdown ⚫ Protection Function HT8691R has the protection functions such as Over-Current Protection function, Thermal Protection function, and Low Voltage Malfunction Prevention function. (1) Over-current Protection function When a short circuit occurs between one output terminal and Ground, PVDD, or the other output, the over-current protection mode starts up. In the over current protection mode, the differential output terminal becomes a high impedance state. Once the short circuit conditions are eliminated, the over current protection mode can be cancelled automatically. (2) Thermal Protection function When excessive high temperature of HT8691R (150℃) is detected, the thermal protection mode starts up. In the thermal protection mode, the differential output terminal becomes Weak Low state (a state grounded through high impedance). (3) Low voltage Malfunction Prevention function This is the function to establish the low voltage protection mode when PVDD terminal voltage becomes lower than the detection voltage (VUVLL) for the low voltage malfunction prevention. And the protection mode is canceled when PVDD terminal voltage becomes higher than the threshold voltage (V UVLH). In the low voltage protection mode, the differential output pin becomes Weak Low state (a state grounded through high impedance). HT8691R will start up within the start-up time (TSTUP) when the low voltage protection mode is cancelled Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -27- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier ⚫ PCB Layout Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -28- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier ◼ PACKAGE OUTLINE Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -29- 12/2020 – V1.3 HT8691R Class D/AB Audio Amplifier IMPORTANT NOTICE 注意 Jiaxing Heroic Electronic Technology Co., Ltd (HT) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any products or services. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. 嘉兴禾润电子科技有限公司（以下简称HT）保留对产品、服务、文档的任何修改、更正、提高、改善和其他改变，或停止 提供任何产品和服务的权利。客户在下单和生产前应确保所得到的信息是最新、最完整的。 HT assumes no liability for applications assistance or customer product design. Customers are responsible for their products and applications using HT components. HT对相关应用的说明和协助以及客户产品的板级设计不承担任何责任。 HT products are not authorized for use in safety-critical applications (such as life support devices or systems) where a failure of the HT product would reasonably be expected to affect the safety or effectiveness of that devices or systems. HT的产品并未授权用于诸如生命维持设备等安全性极高的应用中。 The information included herein is believed to be accurate and reliable. However, HT assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. 本文中的相关信息是精确和可靠的，但HT并不对其负责，也不对任何可能的专利和第三方权利的侵害负责。 Following are URLs and contacts where you can obtain information or supports on any HT products and application solutions: 下面是可以联系到我公司的相关链接和联系方式： 嘉兴禾润电子科技有限公司 Jiaxing Heroic Electronic Technology Co., Ltd. 地址: 浙江省嘉兴市凌公塘路3339号JRC大厦A座三层 Add: A 3rd floor, JRC Building, No. 3339, LingGongTang Road, Jiaxing, Zhejiang Province Sales: 0573-82585539, sales@heroic.com.cn Support: 0573-82586151, support@heroic.com.cn Fax: 0573-82585078 Website: www.heroic.com.cn; wap.heroic.com.cn Wechat MP: HEROIC_JX 请及时关注禾润官方微信公众号，随时获取最新产品信息和技术资料！ Copyright ©2019, Jiaxing Heroic Technology Co., Ltd -30- 12/2020 – V1.3