Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2.2W×2 Class-D Audio Power Amp. with Headphone Output Preliminary PT2001 DESCRIPTION The PT2001 is a Class-D power amplifier designed for audio equipments, maximum output power can reach up to 2.2W x 2 (VDD= 5V, RL= 4Ω, THD= 10%). The PT2001 composed of exclusively designed Class-D circuitry (patented) by PTC, along with the most advanced semi-conductor technology. When compared to the traditional Class-AB amplifiers, the PT2001’s has a much higher efficiency (>85%), low heat dissipation, and produces superior audio quality. PT2001’s external circuitry is simple and easily accessible, and consists of flawless self-protection capabilities. The chip’s packaging is small, thus it occupies an insignificant amount of space on the circuit board; therefore, making it the predominant choice when it comes to audio amplifiers. FEATURES • • • • • • • • • • • • • • CMOS technology Stereo, differential input for improved CMRR. Maximum output power 2.2W (4Ω) x 2 @ THD=10% Operating on Both BTL (Bridged Tight Loaded) and SE (Single Ended) configuration No LC filter needed when driving speakers in BTL configuration. Driving 32Ω headphone on SE configuration. Highly Improved PSRR (>70dB) for powered from noisy PC-BUS power. Automatic gain-reduced during headphone attached to the amplifier. Shutdown function POP noiseless in shutdown and power ON/OFF period Built-in short circuit protection Built-in overheat protection High efficiency (8Ω load>85%), low heat dissipation TSSOP 20 pins miniature packages for saving PCB size. APPLICATIONS • • • • • • • Portable media player Portable DVD player LCD monitor Small multimedia speakers Hand-free phone Laptop Other audio applications PT2001 PRE1.0 -1- October , 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2.2W×2 Class-D Audio Power Amp. with Headphone Output Preliminary PT2001 PIN CONFIGURATION PT2001 PRE1.0 -2- October , 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2.2W×2 Class-D Audio Power Amp. with Headphone Output Preliminary PT2001 APPICATION CIRCUIT DIAGRAM +5V L1 FB R-IN L-IN C1 0.22uF C2 0.22uF C3 1uF C4 1uF C5 0.22uF C6 0.22uF 1 NC OUTRP 20 2 INRP GND 19 3 INRN GNDR 18 4 VCC VDDR 17 5 HPIN OUTRN 16 6 SD OUTLN 15 7 REF VDDL 14 8 INLN GNDL 13 9 INLP GND 12 NC OUTLP 11 10 SW1 shutdown PT2001 C9 10uF L2 FB L3 FB C10 1nF C7 1uF SP1 R-SPEAKER C11 1nF L4 FB L5 FB C12 1nF C8 1uF SP2 L-SPEAKER C13 1nF L6 FB R3 L7 82 100uH C16 220uF C14 0.22uF R5 1K C15 0.22uF R1 150K R2 R4 L8 82 100uH C17 R6 1K 2 10 11 3 1 U1 PHONEJACK 220uF 150K Notes: 1. R3 and R4 is use to reduce gain when headphone is attached to the PT2001, recommend range is from 56Ω to 82Ω value depends on headphone’s sensitivity. Larger resistance will limit the maximum volume of headphone and also reduced residual noise. 2. Speaker Output CAN NOT use LC low pass filter because the chip would malfunction. 3. Parts List : PTC Parts No. Vendor‘s Name Component Type L1, L2, L3,L4,L5,L6 3L COILS Ferrite Bead L7,L8 3L COILS Inductor PT2001 PRE1.0 Vendor No. SMB-201209-F2-121P SMTSDR322520C-101K -3- Specification DCR<0.1Ω Isat>3A, Z=120Ω@100MHz L=100µH, Isat=100mA October , 2007 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 2.2W×2 Class-D Audio Power Amp. with Headphone Output Preliminary PT2001 ORDER INFORMATION Valid Part Number PT2001-TX PT2001 PRE1.0 Package Type 20 Pins, TSSOP, 173mil -4- Top Code PT2001-TX October , 2007