HT82V7534 3W Stereo Filter-free Class-D Audio Power Amplifier Features Description • 1.8V to 6V Single Supply • Output Power: ♦♦ 3W/channel at 5V and 4Ω speaker ♦♦ • • • • • • • • • • • • • The HT82V7534 is a filter-less stereo Class D audio power amplifier IC. The device can deliver up to 3 watts per channel into a 4Ω load at a 5V operating voltage. The advantage of using class D amplifiers is that they offer superior efficiency over the traditional linear amplifiers. This advantage results in less heat generation thus eliminating the need for heat sinking making them ideal for use in small outline products. 4.45W/channel at 6V and, 4Ω speaker Up to 90% power efficiency Automatic output power control – APC 2.8mA quiescent current at 5V Less than 0.2µA shutdown current Pop noise elimination during power on/off Mute and Shutdown function Output pin short circuit protection with auto recovery Over-temperature and over-current protection with auto recovery Integrated hard limiter function Limiter time and gain control on the fly Differential 250kHz PWM allows Bridge-TiedLoad to increase output power and eliminate LC output filter Differential signal processing for improved CMRR 20-pin TSSOP-EP package One special feature of the device is its ability to operate over a wide voltage range, from 1.8V to 6V. Additional features include automatic power level control, wherein the output power remains consistent for different voltages. A function to reduce the annoying "pop" sound which could be generated during power on/off operations is also included. The device contains a range of protection features, such as output short circuit protection, over current/thermal shutoff and auto recovery functions which restores the device to normal operation once the source of the problem has been resolved. The superior efficiency of this Holtek class D audio amplifier together with its wide operating voltage and ability to directly drive speakers make it excellent for use in compact portable battery operated equipment where battery life will be an important consideration. Applications • • • • • • Portable audio products Battery powered audio products MP3 players Bluetooth speakers Notebook/Tablet PCs Smartphones Block Diagram LINP 15K PWM Power Drive LOUTP LOUTN 15K LINN 200K SDNB MUTE VDD X 4 GND X 2 200K 200K Control Circuitry AVDD AVSS LIM CAP RINP 15K PWM Power Drive ROUTP ROUTN 15K RINN Rev. 1.00 1 January 01, 2016 HT82V7534 Pin Assignment LOUTP 1 20 GND VDD 2 19 LOUTN MUTE 3 18 VDD LINP 4 17 SDNB LINN 5 AVDD RINN 6 21 16 GND 15 RINP 7 14 CAP LIM 8 13 VDD VDD 9 12 ROUTN 10 11 GND ROUTP AGND HT82V7534 20 TSSOP-A Pin Description Pin Number Pin Name Type 1 LOUTP AO Description 2 VDD PWR 3 MUTE DI 4 LINP AI Left Channel Positive Differential Input 5 LINN AI Left Channel Negative Differential Input Left Channel Positive Output Digital Power Supply Audio Mute Function – active high 6 RINN AI Right Channel Negative Differential Input 7 RINP AI Right Channel Positive Differential Input 8 LIM DI Limiter Enable – active high 9 VDD PWR 10 ROUTP AO 11 GND PWR Digital Power Supply Right Channel Positive Output Digital Ground 12 ROUTN AO 13 VDD PWR Right Channel Negative Output 14 CAP AO 15 AGND PWR Analog Ground 16 AVDD PWR Analog Power Supply 17 SDNB DI 18 VDD PWR 19 LOUTN AO 20 GND PWR Digital Ground 21 GND PWR Exposed Ground Pad Digital Power Supply Limiter Operation Capacitor Shutdown Control – active low Digital Power Supply Left Channel Negative Output ** AO: Analog Output; AI: Analog Input; DI: Digital Input; PWR: Power Pin Absolute Maximum Ratings Supply Voltage ..................................VSS-0.3V to 6.5V Input Voltage.............................VSS-0.3V to VDD+0.3V Storage Temperature ............................-50°C to 125°C Operating Temperature..…….................-40°C to 85°C Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maximum Ratings" may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability. Rev. 1.00 2 January 01, 2016 HT82V7534 Package Dissipation Ratings Package Derating Factor TA≤25°C Power Rating TA=70°C Power Rating TA=85°C Power Rating TSSOP20 26mW/°C 3.25W 2.08W 1.69W DC Characteristics Symbol VDD/AVDD Parameter Supply Voltage VDD=AVDD=2.5V-6.0V, TA=25°C, (unless otherwise noted) Test Conditions VDD Conditions — — 5V IQ Quiescent Current Per Channel 3.6V No load 2V Typ. Max. Unit 1.8 — 6.0 V — 2.8 3.2 mA — 2.2 2.6 mA — 1.1 1.5 mA — 0.2 0.5 µA ISTB Standby Current — VIH SDNB, MUTE, LIM High Level Logic Level 5V — 2.0 — VDD V VIL SDNB, MUTE, LIM Low Level Logic Level 5V — 0 — 0.8 V IIH SDNB, MUTE, LIM High-level Input Current 5V SDNB/MUTE/LIM=5V — — 30 µA IIL SDNB, MUTE, LIM Low-level Input Current 5V SDNB/MUTE/LIM=0V — — 1 µA VOS Differential Output Offset Voltage — All inputs are AC grounded, AV=25 — ±25 — mV RDSON Static drain-source on-state Resistance 5V RL=8Ω — 400 — mΩ RIN RINN/RINP/LINN/LINP Input Resistance — RINN/RINP/LINN/LINP=0V — 15 — kΩ RSDNB SDNB/MUTE/LIM Input Resistance — SDNB/MUTE/LIM=0V — 200 — kΩ AV BTL Gain — V/V Ioc Over-current Protection Threshold SDNB=0.5V Min. RL=8Ω — 25 — Vo+ shorted to VDD — 2.5 — VDD Vo- shorted to VDD =AVDD Vo+ shorted to GND =5V Vo- shorted to GND — 2.5 — — 1.4 — — 1.4 — — 1.8 — — 16 — mS — 2 — mA -40 — 85 °C Vo+ shorted to VoTAR Iq(oc) TA Rev. 1.00 Over-current Detection Time (Time from Overcurrent Detected VDD Vo+/Vo- shorted to VDD/GND, to Retrial) =AVDD Vo+ shorted to Vo=5V Supply Current under Over-current Protection Operating Temperature — — 3 A January 01, 2016 HT82V7534 AC Characteristics Symbol VDD=AVDD=2.5V-6.0V, TA=25°C, (unless otherwise noted) Parameter Test Conditions LIM THD (%) of Limiter Enable Point VDD=3.6V~6.0V fSW Switching Frequency PSRR Common Mode Rejection Ratio SNR Signal-to-noise Ratio PO=1W, RL=8Ω CMRR Common Mode Rejection Ratio VIC=1Vpp, RL=8Ω Min. Typ. Max. — 1 — Unit % 200 250 300 kHz — -70 — dB — 100 — dB — -70 — dB Note: When supply voltage is below 2.2V and 4Ω speaker is used, the protection will be triggered if total harmonic distortion of the output is greater than 1%, To prevent this protection from happening an 8Ω speaker should be used instead. Operating Characteristics VDD=AVDD=5V, Power Supply Capacitance=470µF, TA=25°C, (unless otherwise noted) Symbol Parameter Test Conditions VDD THD=1% 3.6V THD=10% THD=1% 5.0V THD=10% PO Output Power THD=1% 5.5V THD=10% THD=1% 6.0V THD=10% Rev. 1.00 Min. Typ. 4Ω — 1.04 — 8Ω — 0.7 — Conditions 4 Max. 4Ω — 1.55 — 8Ω — 0.88 — 4Ω — 2.44 — 8Ω — 1.39 — 4Ω — 3.02 — 8Ω — 1.72 — 4Ω — 2.98 — 8Ω — 1.69 — 4Ω — 3.67 — 8Ω — 2.09 — 4Ω — 3.02 — 8Ω — 1.73 — 4Ω — 4.45 — 8Ω — 2.53 — Unit W January 01, 2016 HT82V7534 Typical Performance Characteristic Total Harmonic Distortion + Noise vs. Output Power Total Harmonic Distortion + Noise vs. Output Power VDD=3.6V @ 4Ω VDD=3.6V @ 8Ω Total Harmonic Distortion + Noise vs. Output Power Total Harmonic Distortion + Noise vs. Output Power VDD=5V @ 4Ω VDD=5V @ 8Ω Total Harmonic Distortion + Noise vs. Output Power Total Harmonic Distortion + Noise vs. Output Power VDD=5.5V @ 4Ω VDD=5.5V @ 8Ω Rev. 1.00 5 January 01, 2016 HT82V7534 Total Harmonic Distortion + Noise vs. Output Power Total Harmonic Distortion + Noise vs. Output Power VDD=6V @ 4Ω VDD=6V @ 8Ω Output Power Sypply Voltage Output Powervs vs Power Power Supply Voltage Output Power vs Power Supply Voltage Output Power vs Power Sypply Voltage 4Ω, THD=10%, 1KHz 8Ω, THD=1%, 1KHz 4Ω , 10% 4Ω , 1% 2.5 8Ω , 10% 2 8Ω , 1% 1.5 1 0.5 0 3.6 5.0 5.5 3.6 6.0 5.0 6.0 4Ω, THD=1% & 10% 8Ω, THD=1% & 10% Output Power vsvsPower Sypply Voltage Output Power Power Supply Voltage Output Power vsvsPower Sypply Voltage Output Power Power Supply Voltage 4 3.5 3 8Ω, THD=1%, 1KHz 4Ω , 1% 2.5 2 1.5 1 8Ω , 1% 0.5 0 3.6 5.0 5.5 8Ω, THD=10%, 1KHz 4Ω, THD=10%, 1KHz Po - Output Power - W 4Ω, THD=1%, 1KHz Po - Output Power - W 5.5 VDD - V VDD - V 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 4Ω , 10% 8Ω , 10% 3.6 6.0 5.0 5.5 6.0 VDD - V VDD - V 4Ω vs 8Ω, THD=1% Rev. 1.00 8Ω, THD=10%, 1KHz 3 Po - Output Power - W Po - Output Power - W 4Ω, THD=1%, 1KHz 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 4Ω vs 8Ω, THD=10% 6 January 01, 2016 HT82V7534 Power Efficiency - 5V, 4ohm & 8ohm 8Ω+33μH 4Ω+33μH 1.0 0.9 Efficiency (%) 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Po - Output Power (W) Power Efficiency, 4Ω & 8Ω @5V Noise vs Frequency @5V Rev. 1.00 7 January 01, 2016 HT82V7534 Functional Description The HT82V7534 is a Class D type stereo audio amplifier. Offering the advantages of fully digital operation this Class D audio amplifier has the advantages of low power losses resulting in higher efficiencies and reducing the need for heat sinking. Power down and Mute functions along with several protection features provide a highly functionally integrated audio amplifier solution. Low Voltage Detection A power supply voltage monitoring circuit is integrated into the device. Should the supply voltage fall below a value of about 1.7V then the outputs will be disabled. When the supply voltage is maintained above 1.8V then the device will operate normally. Pop-Free Amplifier Input Stage The device includes a pop-free function. However to fully eliminate any annoying "pop" sounds being generated when the device is powered on or off, switching in the mute mode, switching in the shutdown mode, recovery from temperature protection or recovery from over-current protection it is important to ensure that the differential inputs are fully balanced. Looking into any of the audio pins will see a resistance of 15KΩ. The following diagram shows a typical input stage circuit. External Circuit C1 Rext1 Zin 15K inp 0.1µF C2 1K Rext2 C3 Automatic Output Power Control – APC HT82V7534 4.7nF Zin The voltage gain of the amplifier will automatically adjust itself over the full voltage range. This means that, regardless of changes to the supply voltage, the output power will remain at approximately the same level for a given input level for a supply voltage range of 2.5v to 6.0v. This feature could be important in battery powered applications where the supply voltage will drop as the batteries lose their charge. 15K inn 0.1µF 1K Audio Input Stage Here external resistors have been connected between the amplifier audio inputs and the external audio signal source to setup the gain value. As the external signal needs to be ac coupled to the amplifier using capacitors this will form a high pass filter with these resistors. The –3db frequency of this input high pass filter will be given by. Amplifier Gain The voltage gain of the amplifier is determined by a resistance ratio. The formula for calculating the voltage gain over the supply voltage range of VDD= AVDD=2.5V to 6.0V, is given by the following formula: f-3db=1/(2πRC) (1) Where C is the ac coupling capacitance, C1 or C2, and R is the total resistance in series with the capacitor. So here C=0.1µF and R=Zin + Rext, in the example of the diagram which gives a value of 1K + 15K. Putting these numbers into the above equation gives a -3db frequency of about 100Hz. A bypass capacitor, C3, is also connected across the input pins to attenuate any high frequencies. This capacitor will form a low pass filter with the resistors. In this example Rext=1KΩ, Zin=15K and C=4.7nF. Thus the – 3db frequency on the high frequency side is about 18kHz. ൌ ͵ͷܭ (2) ͳͷ ܭ ܴ݁ݐݔ Where Rext is the external series resistance at the input pin which can be seen in the application circuits. Note that these gain setting external resistors must be well matched to avoid the creation of any pop noise during operation. It is important to ensure that any external input pin related components are well matched. Not ensuring good matching of these differential input components may create an annoying pop noise during operation. Rev. 1.00 8 January 01, 2016 HT82V7534 Shutdown Function – SDNB TTL level input LIM The device can be shut down to conserve power during times when the audio output function of the product is not required. The shutdown function is executed by pulling the SDNB pin low. When the SDNB pin is high the device will operate normally. There is an internal pull down resistor of 200KΩ between the SDNB pin and ground. 200K LIM Pin Model This audio signal magnitude reduction will be maintained for a certain period of time which is determined by the size of an external capacitor connected to the CAP pin. After this time period has elapsed the output audio signal will return to its normal magnitude. For a capacitor value of 0.22uF, the magnitude reduction time period is 8.5 seconds. This time period changes with the capacitor value in a linear manner. Therefore for a capacitor value of 0.1uF the time period will be 3.8 seconds. An internal current source is connected to the CAP pin which charges the external capacitor in a linear manner. TTL level input SDNB 200K SDNB Pin Model Mute Function – MUTE The device includes a mute function which will disable any output signal generation but while still keeping the device active with a PWM duty cycle of 50%. The mute function is executed by pulling the MUTE pin high. When the MUTE pin is low the audio output will operate normally. There is an internal pull down resistor of 200KΩ between the MUTE pin and ground. I HT82V7534 CAP External Capacitor TTL level input MUTE CAP Pin Configuration An external control signal connected to the CAP pin can be used as a gain control signal as it can overwrite the limiter operation and behave like a gain control. If an external control signal is connected to the CAP pin, then when this signal is high, the amplifier will maintain its normal gain setting. However driving this pin low will force the amplifier to have a reduced gain down to 6dB from the original value. The voltage gain can be changed on the fly and there is no delay when the control signal switches in between the low and high values. 200K MUTE Pin Model Hard Limiter and Control – LIM The device includes a hard limiter function. The hard limiter detects the THD of the output signals and if it is below approximately 1% takes no action. However should the THD of the output signal be above 1% the hard limiter will immediately reduce the magnitude of the output signal by 6dB. This prevents the output signals from being clipped, avoiding the generation of high order harmonic signals which create unpleasant distorted sound effects. The hard limiter function is enabled by pulling the LIM pin high. Keeping the LIM pin low will disable the limiter. When the limiter is disabled the amplifier will have a fixed gain as described elsewhere. There is an internal pull down resistor of 200KΩ between the LIM pin and ground. Rev. 1.00 Differential Input versus Single Ended Input Using a differential input type will result in better noise immunity over a single ended input. The common mode rejection characteristics of the device’s internal differential input amplifier will reject any noise which appears on both pins and will only amplify the differential audio signal on the input pins. If a single ended input structure is required, then the negative input should be connected to ground. If external series input resistors are used, then the negative input has to be grounded using a series resistor of the same value as the positive input to keep the input stage balanced to reduce common mode noise 9 January 01, 2016 HT82V7534 EMI and LC Output Filter Design Vo+ To reduce EMI interference ferrite bead filters can be used. A ferrite filter will reduce EMI frequencies of around 1 MHz and higher. Note that FCC and CE only test radiated emissions greater than 30 MHz. When selecting a ferrite bead, choose one with a high impedance at high frequencies but with a low impedance at low frequencies or high impedance at the interfering frequencies. 0.1µF 0.47µF Vo- 33µH 0.1µF Use an LC output filter if there are any low frequency (< 1 MHz) EMI sensitive circuits and if there are any long wires from the amplifier to the speaker. Note that EMI is also affected by PCB layout and the placement of the surrounding components therefore care must be taken in this regard. Typical BTL Output LC Filter – 3 Over Temperature Protection The device includes an integrated temperature sensor. When this detects an internal temperature about 120°C or above, the output signals will be disabled to protect the device from any damage. An automatic recovery circuit enables the device to return to normal operation when the internal temperature of the device returns to below around 100°C. The suggested LC configuration for EMI filters are shown as follows. Vo+ 33µH bead 1nF Over Current Protection Vo- A current detection circuit is integrated into the device to detect the switching current of the output stages of the device. It disables the device when the current is beyond the current limits specified in the operating characteristics. This protects the device when there is an accidental short circuit between the outputs or between the output pins and power/ ground pins. An automatic recovery circuit returns the device to normal operation when the problem source is removed. The delay time between protection and recovery is about 16ms. If the short circuit condition is not removed the after auto-recovery time the protection circuit will disable the output transistors again. The protection circuit will switch the output transistors on and off until the source of the short circuit condition is removed. bead 1nF Filter-less BTL Output Configuration – 1 Vo+ 33µH 1µF Vo- 33µH 1µF Typical BTL Output LC Filter – 2 Rev. 1.00 10 January 01, 2016 HT82V7534 Application Circuits Differential Input Configuration VDD VDD AVDD 220uF GND LOUTP AGND VDD MUTE Differential Input 1 Differential Input 2 GND LOUTN VDD 0.1uF LINP 0.1uF LINN AVDD 0.1uF RINN AGND 0.1uF RINP CAP LIM VDD VDD ROUTP SDNB AVDD 0.22uF ROUTN GND Differential Input Application Single Ended Input Configuration VDD VDD AVDD 220uF GND LOUTP AGND Single-ended Input 1 Single-ended Input 2 VDD MUTE GND LOUTN VDD 0.1uF LINP SDNB 0.1uF LINN AVDD 0.1uF RINN AGND 0.1uF RINP CAP LIM VDD VDD ROUTP AVDD 0.22uF ROUTN GND Single Ended Input Application Rev. 1.00 11 January 01, 2016 HT82V7534 Differential Input with Gain=375K/(15K+Ri) VDD VDD AVDD 220uF GND LOUTP AGND VDD Differential Input 1 Differential Input 2 GND LOUTN MUTE VDD 0.1uF Ri 0.1uF Ri LINN Ri AVDD 0.1uF AGND 0.1uF Ri RINN RINP CAP LIM VDD LINP AVDD SDNB VDD 0.22uF ROUTN ROUTP GND Differential Input with Fixed REXT Gain Control Application Differential Input with Gain Control VDD VDD AVDD 220uF GND AGND LOUTP VDD 1K Differential Input 1 Differential Input 2 VR1 50K MUTE GND LOUTN VDD 0.1uF 22K 1K 0.1uF 22K 1K LINN 22K AVDD 0.1uF AGND 0.1uF 22K RINN RINP CAP LIM VDD 1K VR2 50K LINP VDD ROUTP SDNB AVDD 0.22uF ROUTN GND Differential Input with Adjustable Gain Control Application Rev. 1.00 12 January 01, 2016 HT82V7534 Single Ended Input with Gain Control VDD AVDD VDD 220uF GND AGND LOUTP J1 VDD VR1 50K VR2 50K MUTE GND LOUTN VDD 0.1uF 22K LINP 22K SDNB 0.1uF LINN 22K AVDD 0.1uF AGND 0.1uF 22K RINN RINP CAP LIM VDD 0R VDD ROUTP AVDD 0.22uF ROUTN GND Single Ended Input with Fixed REXT Gain Control Application Rev. 1.00 13 January 01, 2016 HT82V7534 Package Information Note that the package information provided here is for consultation purposes only. As this information may be updated at regular intervals users are reminded to consult the Holtek website for the latest version of the package information. Additional supplementary information with regard to packaging is listed below. Click on the relevant section to be transferred to the relevant website page. • Further Package Information (include Outline Dimensions, Product Tape and Reel Specifications) • Packing Meterials Information • Carton information Rev. 1.00 14 January 01, 2016 HT82V7534 20-pin TSSOP Outline Dimensions (Exposed Pad) Symbol Dimensions in inch Min. Nom. Max. A — — 0.047 A1 0.002 — 0.006 A2 0.031 0.039 0.041 B 0.007 — 0.012 C 0.004 — 0.006 D 0.252 0.256 0.260 D1 0.087 — — E — 0.252 BSC — E1 0.169 0.173 0.177 E2 0.059 — — e — 0.026 BSC — L 0.018 0.024 0.030 L1 — 0.039 BSC — y — 0.004 — θ 0° — 8° Symbol Rev. 1.00 Dimensions in mm Min. Nom. Max. A — — 1.20 A1 0.05 — 0.15 A2 0.80 1.00 1.05 B 0.19 — 0.30 C 0.09 — 0.16 D 6.40 6.50 6.60 D1 2.20 — — E — 6.40 BSC — E1 4.30 4.40 4.50 E2 1.50 — — e — 0.65 BSC — L 0.45 0.60 0.75 L1 — 1.0 BSC — y — 0.10 — θ 0° — 8° 15 January 01, 2016 HT82V7534 Copyright© 2016 by HOLTEK SEMICONDUCTOR INC. The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. Holtek's products are not authorized for use as critical components in life support devices or systems. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw. Rev. 1.00 16 January 01, 2016