Audio amplifiers PAM8001
17Pages

Diodes Incorporated ANTI-SATURATION FILTERLESS 2W CLASS-D STEREO AMPLIFIER WITH DC VOLUME CONTROL AND MAX OUTPUT POWER SETTING The PAM8001 is a 2W, class-D audio amplifier. Advanced 64-step DC volume control minimizes external components and allows speaker volume control. PAM unique anti-saturation technology which detects output signal clip due to the over level input signal suppress the output signal clip automatically. Also control the gain for set max power. It can protect low wattage speaker from overdrive damage even same platform with high wattage model. It offers low THD+N, to produce high-quality sound reproduction. The new filterless architecture allows the device to drive the speaker directly, without low-pass output filters which will save system cost and PCB area. With the same numbers of external components, the efficiency of the PAM8001 is much better than class-AB cousins. It can extend the battery life thus be ideal for portable applications. 2W Output at 1 % THD with a 40. Load at 5V Power Supply Filterless, Low Quiescent Current and Low EMI Unique Anti-Saturation Function Adjustable Max Output Power with No Clipping Short Circuit Protection Thermal Shutdown Few External Components to Save the Space and Cost Pb-Free Package Notebook Computers Portable Speakers Portable DVD Players, Game Machines VoIP/Speaker Phones Document number: DSxxxxx Rev. 1-0

Diodes Incorporated Typical Applications Circuit PGNDL PGNDL PVDDR PGNDR PGNDR GND "^-^~L ANTI-ON Document number: DSxxxxx Rev.

Diodes Incorporated Functional Block Diagram PVDDR PGNDR Prote ction PVDDL PGNDL Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) These are stress ratings only and functional operation is not implied Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. All voltages are with respect to ground. Document number: DSxxxxx Rev. 1-0

A Product Line of Diodes Incorporated PAM8001 Thermal Information Parameter Thermal Resistance (Junction to Ambient) Thermal Resistance (Junction to Ambient) Electrical Characteristics (VDD = 5V, Gain = Maximum, RL = 8Ω, @TA = +25°C, unless otherwise specified.) Symbol Supply Voltage Range Quiescent Current Output Offset Voltage Drain-Source On-State Resistance Output Power with AntiSaturation Output Power without AntiSaturation Total Harmonic Distortion Plus Noise Power Supply Ripple Rejection Input AC-GND, f = 1KHz, VPP = 200mV, Gain = 6dB Channel Separation Oscillator Frequency PO =...

Diodes Incorporated Typical Operating Characteristics (@Ta = +25°C, unless otherwise specified.) 1. THD+N vs Output Power vs Input 3. THD+N vs Output Power Document number: DSxxxxx Rev. 1-0

Diodes Incorporated Typical Operating Characteristics (cont.) (@TA = +25°C, unless otherwise specified.) Document number: DSxxxxx Rev. 1-0

Diodes Incorporated Typical Operating Characteristics (cont.) (@TA = +25°C, unless otherwise specified.) 13.Case Temperature vs Output Power 14.Case Temperature vs Output Power Power Supply Voltage(V) Document number: DSxxxxx Rev. 1-0

A Product Line of Diodes Incorporated Typical Operating Characteristics (cont.) (@TA = +25°C, unless otherwise specified.) PAM8001 Document number: DSxxxxx Rev. 1 - 0 February 2013 © Diodes Incorporated

A Product Line of Diodes Incorporated PAM8001 Document number: DSxxxxx Rev. 1 - 0 February 2013 © Diodes Incorporated

A Product Line of Diodes Incorporated Application Information 1. When the PAM8001 works with LC filters, it should be connected with the speaker before it's powered on, otherwise it will be damaged easily. 2. When the PAM8001 works without LC filters, it's better to add a ferrite chip bead at the outgoing line of speaker for suppressing the possible electro magnetic interference. 3. The absolute maximum rating of the PAM8001 operation voltage is 6.0V. When the PAM8001 is powered with 4 battery cells, it should be noted that the voltage of 4 new dry or alkaline batteries is over 6V, higher...

Diodes Incorporated Application Information (cont.) Input Signal Output Signal Gain -EL Output Signal wltli Adjustable Power Llrnll Funcllan Note: 2. Please contact Diodes for detail information. Anti-Saturation Function If the preset gain is higher than power set, anti-saturation is active be detecting the duty cycle of the PWM output. When the mode has been detected, the gain is automatically adjusted to the value that the output is not clip step by step. The attach is immediate and the release time is MUTE Operation The MUTE pin is an input for controlling the output state of the...

A Product Line of Diodes Incorporated PAM8001 Application Information (cont.) For the best power on/off pop performance, the amplifier should be placed in the Mute mode prior to turning on/off the power supply. Power Supply Decoupling The PAM8001 is a high performance CMOS audio amplifier that requires adequate power supply decoupling to ensure the output THD and PSRR are as low as possible. Power supply decoupling affects low frequency on the power supply leads. For higher frey response, optimum decoupling is achieved by using two capacitors of different types that target different types...

A Product Line of Diodes Incorporated Application Information (cont.) How to Reduce EMI (Electro Magnetic Interference) A simple solution is to put an additional capacitor 1000uF at power supply terminal for power line coupling if the traces from amplifier to speakers are short (<20CM). Most applications require a ferrite bead filter as shown at Figure 1. The ferrite filter reduces EMI around 1 MHz and higher. When selecting a ferrite bead, choose one with high impedance at high frequencies, and low impedance at low frequencies (MH2012HM221-T). Figure 1 Ferrite Bead Filter to Reduce EMI PCB...

Diodes Incorporated Ordering Information Marking Information ~~TF\ PGNDR ~zui PVDDR TB~I SHDN Internal Code Internal Code Document number: DSxxxxx Rev. 1-0

Diodes Incorporated Package Outline Dimensions (AH dimensions in mm ) Document number: DSxxxxx Rev. 1-0