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2W x 2 Class AB Audio Power Amplifier
PT2303
DESCRIPTION
The PT2303 is a power amplifier utilizing CMOS Technology specially designed for audio purpose. It can deliver 2W x 2 power output to the 5V power voltage. The power consumption is very low in stand-by. Total harmonic distortion is lower than 0.03%. The output mode can be switched between the SE (Single-Ended) or BTL (Bridge-Tied Load) mode. Built-in over-temperature protection, package size is not occupies PCB space. It is suitable for small or portable products.
FEATURES
* * * * * * * * CMOS Technology Stereo input Output power 2W x 2 (4) Low harmonics distortion (0.03%) SE and BTL modes operation Suppress the pop and click noise when mode changed Shutdown function, turn on can into save mode (Icc<0.5A) Built-in overheat protect
APPLICATIONS
* * * * LCD monitor (for TV) Portable audio Multimedia speakers Other audio applications
PT2303 V1.2
-1-
December, 2007
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2303
BLOCK DIAGRAM
-I N 1 +I N 1 AMP1N + -OUT1
Shutdown VDD Vref GND
Power Block AMP1P
+ +OUT1
SE/BTL -I N 2 +I N 2 AMP2N +
HP-IN
-OUT2
AMP2P + +OUT2
PT2303 V1.2
-2-
December, 2007
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2303
PIN CONFIGURATION
Shutdown GND +OUT 1 VDD -OUT1 -IN 1 GND +I N 1 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 HP-IN GND +OUT 2 VDD -OUT2 -IN 2 Vref +I N 2 Shutdown GND +OUT 1 VDD -OUT1 -IN 1 GND +I N 1 NC NC 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 P T 2303 15 14 13 12 11 HP-IN GND +OUT 2 VDD -OUT2 -IN 2 Vref +I N 2 NC NC
P T 2303
PIN DESCRIPTION
Pin Name Shutdown GND +OUT1 VDD -OUT1 -IN1 GND +IN1 +IN2 Vref -IN2 -OUT2 VDD +OUT2 GND HP-IN NC I/O I O O I I I I I O O I Description Shutdown pinEntire IC into the shutdown mode when this pin connected to the Vcc. Ground Channel 1 output (+) Supply voltage input Channel 1 output (-) Channel 1 input (-) Ground Channel 1 input (+) Channel 2 input (+) Bias reference bypassing Channel 2 input (-) Channel 2 output (-) Supply voltage input Channel 2 output (+) Ground Output mode select, connected to the VDD for SE mode or GND for BTL mode No Connect Pin No. 16 Pins 20 Pins 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 13 14 15 16 17 18 19 20 9 ~ 12
PT2303 V1.2
-3-
December, 2007
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2303
FUNCTION DESCRIPTION
POWER SUPPLY
The operating voltage of PT2303 is from 3V to 5V, In general operation 5V is recommended, it can deliver higher power output. When the supply voltage less then 3V the IC can work properly, but the distortion will rise. After the supply voltage exceed 6V the temperature of package outside will rising quickly due to higher stand-by current consumption.
SHUTDOWN
When the supply still powered the chip, pull-up the shutdown pin to VDD level will take chip into the shutdown mode. After the shutdown mode is active, the total current consumption is less than 0.5A and the all of input or output pins no voltage output. When shutdown pin set to GND, the IC is back to the normal operation. Shutdown Pin VDD GND Output State Shutdown ON Normal
VOLTAGE GAIN ADJUST
The output stage structure of the PT2303 is Bridge Tied Loaded (BTL), the close loop voltage gain can be get from following formula. Gain = 20log ( Rf / Ri ) + 6dB The close loop gain can be adjusted by external resistance, in general purpose the 6dB gain setting is recommended, please reference to the application circuit. If the amplitude of input voltage in lower level (ex. < 2Vpp), it can raise the voltage gain to get enough power output. Recommended of the minimum series resistance (Ri) is 10K to ensure IC have appropriate input impedance. Please refer to following table. External Resistance Ri Rf Gain= 0dB 20K 10K Gain= 6dB 20K 20K Gain=12dB 10K 20K
PT2303 V1.2
-4-
December, 2007
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2303
If the amplitude of input signal exceed the VDD-GND range, or voltage gain setup too high, the input stage is very easy overload and distorted. Please make sure the amplitude of audio source (Vin) and setting the best gain value, in general use the gain setup to +6dB is recommended. Please refer to following table. Operating Voltage VDD=3V VDD=5V Gain= 0dB Vin <5Vpp Vin <8Vpp Gain= 6dB Vin <2.5Vpp Vin<4Vpp Gain=12dB Vin <1.25Vpp Vin<2Vpp
SE/BTL MODE SWITCHING
PT2303 have two output modes, SE (Single-Ended) or BTL (Bridge-Tied Load). When driving a 4 speaker load suggestion set to the BTL mode for get the more power output. And driving a 32 headphone load, it can be set to SE mode and turn-off the un-work amplifier to decrease stand-by power consumption. Switching between the SE/BTL modes is controlled by the HP-IN pin, please refer to following table: HP-IN VDD GND Output Mode SE BTL
OVER TEMPERATURE PROTECTION
The PT2303 has a built-in over temperature protection circuit, it will turn off all output when the chip temperature over 130, the chip will return to normal operation automatically after the temperature cool down to 100.
POP AND CLICK SURPRESS
A power amplifier uses single supply voltage may almost have inrush noise on output in the power-on/off period. It is because of the output DC potential needs time to stable on 1/2VDD, the period relative with the capacitance (CB) on the Vref pin. Larger CB value will extend the stable time, and also can suppress the noise happened in power-on. In supply voltage=5V and CB=2.2F, stable time is about 300mS. The value of CB also relative with the value of the DC blocking capacitor connected in input terminal. In general condition the time constant of DC blocking capacitor should be less than CB stable time. The recommended value of DC blocking capacitor is 1F, and the capacitor of output terminal connected to 32 headphone is 220F. Smaller capacitance can shorten the charge time to suppress the pop noise, both the input and output capacitance will limited the low frequency extend range.
PT2303 V1.2
-5-
December, 2007
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2303
HEAT DISSIPATION
During normal operation, the chip only consumes very little stand-by current. In high output power conditions, the package temperature will rise. For proper operating temperature, a modest heat sink mounted on the top side of the chip is required. The thermal resistance requirement of the heat sink demand may be obtained by the formula below: JA = (TJ (max) - TA)/PDISS PDISS = IC dissipation power TJ (max) = Maximum chip conjunction temperature TA = external environment temperature JA = thermal resistance from chip conjunction to ambience environment With 60% estimated efficiency (eff), PT2303 in 2W + 2W output power dissipation is probably PDISS = ( Po / eff ) - Po = 2.6W The maximum chip conjunction temperature is 150, Exceed this temperature will damage the chip, assuming the outside environment air temperature is 50. From the chip conjunction dissipation to external environment thermal resistance JA should be: JA = ( 150 - 50 ) / 2.6 = 38.4/W The PT2303 chip conjunction to case thermal resistance JC is 26 /W. Therefore the heat sink thermal resistance should be: JA - JC = 12.4/W In normal operating, PT2303 needs at least 2 sq inch PCB for heat dissipate; it should be use whole copper foil to cover on it for enough heat dissipation space. We suggest using two-layer PCB for better heat dissipation. The track connected to the output and power pin of IC should be as thick as possible for better heat dissipation ability. If IC doesn't have enough heat dissipation space (>1 sq inch), and IC is always in full power output situation, an additional heat sink should placed on the chip.
PT2303 V1.2
-6-
December, 2007
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2303
ABSOLUTE MAXIMUM RATINGS
Parameter Supply voltage Operating temperature Storage temperature Maximum input voltage Maximum input current Symbol VDD Tamb Tstg Vimax Iimax Condition Min. 0 -40 -65 -0.3 -10 Max. 7 +85 +150 Vcc+0.3 +10 Unit V V mA
*
*Input pins surge current can be reached 100mA will not induce the CMOS latched up.
PACKAGE THERMAL CHARACTERISTICS
PACKAGE TYPE: SOP16L, 300MIL
Parameter From chip conjunction dissipation to external environment From chip conjunction dissipation to package surface Symbol JA JC Condition Ta=25 Value 88.8 26 Unit /W /W
PT2303 V1.2
-7-
December, 2007
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2303
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, VDD=5V, bandwidth=22~22KHz)
Parameter Supply voltage Operating current Two channels gain error THD+N Symbol VDD Is Gerr THD Condition SE Mode BTL Mode Shutdown=ON Ri=Rf=20K Po=0.2W, RL=4 Po=1W, RL=4 Po=50mW, RL=32 THD=1%, RL=8 THD=10%, RL=8 BTL THD=1%, RL=4 THD=10%, RL=4 THD=1%, RL=32 SE THD=10%, RL=32 A-Weighted A-weighted +OUT ~ -OUT BTL F=1KHz SE BTL F=100Hz SE Overheat close Back to work VDD=3~5V Shutdown ON Shutdown pin Shutdown OFF SE VDD=3~5V BTL Min. 3 4 6 0.1 -1 0.03 0.06 0.03 1.0 1.2 1.4 1.8 80 100 95 2 80 80 60 40 85 0.45 0.75 Typ. 5 6 8 0.5 0 0.05 0.08 0.05 1.1 1.4 1.6 2.0 85 110 100 35 10 90 85 70 45 130 100 0.6 0.15 0.8 0.2 Max. 6 10 12 1 +1 0.07 0.15 0.08 1.2 1.6 1.8 2.1 90 120 50 30 100 95 80 50 140 0.2 0.3 Unit V mA A dB %
W
Power output
Po
mW dB V mV dB dB VDD VDD
Signal-to-Noise Residual noise Output offset Channel separation Power Signal-to-Noise repel rate Temperature protect Shutdown voltage SE/BTL voltage
SNR Vno Voff CS PSRR TH VSD VSB
PT2303 V1.2
-8-
December, 2007
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2303
APPLICATION CIRCUIT
CH1 IN
VDD
Ri 1uF 20k
Rf 20k 6
8 1
-IN1 +IN1 Shut Down VDD Vref GND -IN2 +IN2
AMP2N AMP1N
-OUT1
5
220uF 1k BTL/SE Sense
ON OFF
ShutDown
VDD
4,13
POWER BLOCK
AMP1P
+OUT1
3
VDD
CVDD 10uF
CB 1uF
10 2,7,15 11
100k
SE/BTL HP-IN 16
100k
-OUT2 12
HEADPHONE
CH2 IN
1uF Ri 20k
9
220uF
1k
Rf 20k
AMP2P
+OUT2
14
PT2303 V1.2
-9-
December, 2007
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2303
ORDER INFORMATION
Valid Part Number PT2303-D PT2303-S PT2303-TX Package Type 16 Pins, DIP, 300mil 16 Pins, SOP, 300mil 20 Pins, TSSOP Top Code PT2303-D PT2303-S PT2303-TX
PT2303 V1.2
- 10 -
December, 2007
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2303
PACKAGE INOFRMATION
16PINS, DIP, 300MIL
PT2303 V1.2
- 11 -
December, 2007
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
Symbol A A1 A2 b b1 b2 b3 c c1 D D1 E E1 e eA eB eC L Min. 0.015 0.115 0.014 0.014 0.045 0.030 0.008 0.008 0.780 0.005 0.300 0.240 0.000 0.115 Nom. 0.130 0.018 0.018 0.060 0.039 0.010 0.010 0.790 0.310 0.250 0.100 bsc 0.300 bsc 0.130 Max. 0.210 0.195 0.022 0.020 0.070 0.045 0.014 0.011 0.800 0.325 0.280 0.430 0.060 0.150
PT2303
Notes: 1. Controlling Dimension: INCHES. 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Dimensions A, A1 and L are measured with the package seated in JEDEC Seating Plane Gauge GS-3. 4. D, D1 and E1 dimensions do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.010 inch. 5. E and eAmeasured with the leads constrained to be perpendicular to datum -C-. 6. eB and eA are measured at the lead tips with the leads unconstrained. 7. N is the maximum number of terminal positions (N=16). 8. Pointed or rounded lead tips are preferred to ease insertion. 9. b2 and b3 maximum dimensions do not include dambar protrusions. Dambar protrusions shall not exceed 0.010 (0.25mm). 10. Variation AB is a full lead package. 11. Distance between leads including dambar protrusions to be 0.005 in minimum. 12. Datum plane -H- coincident with the bottom of lead where lead exits body. 13. Refer to JEDEC MS-001 Variation AB. JEDEC is the registered trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.
PT2303 V1.2
- 12 -
December, 2007
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2303
16 PINS, SOP, 300 MIL
PT2303 V1.2
- 13 -
December, 2007
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
Symbol A A1 B C D E e H h L Min. Max 2.35 2.65 0.10 0.30 0.33 0.51 0.23 0.32 10.10 10.50 7.40 7.60 1.27 BSC 10.00 10.65 0.25 0.75 0.40 1.27 0o 8o
PT2303
Notes: 1. Controlling Dimension: MILLIMETER 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Dimension D does not include mold flash, protrusions or gate burrs. Mold flash, protrusions and gate burrs shall not exceed 0.15mm (0.006 in) per side. 4. Dimension E does not include interlead flash or protrusions. Interlead flash and protrusions shall not exceed 0.25 mm (0.010 in.) per side. 5. The chamfer on the body is optional. If it is not present, a visual index feature must be located within the crosshatched area. 6. L is the length of the terminal for soldering to a substrate. 7. N is the number of terminal positions (N=16). 8. The lead width B, as measured 0.36 mm (0.014in) or greater above the seating plane, shall not exceed a maximum value of 0.61mm (0.024in.) 9. Refer to JEDEC MS-013 Variation AA. JEDEC is the registered trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.
PT2303 V1.2
- 14 -
December, 2007
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2303
20PINS, TSSOP, 173MIL
PT2303 V1.2
- 15 -
December, 2007
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2303
Symbols A A1 A2 b b1 c c1 D E E1 e L L1 R R1 S 1 2 3
Min 0.05 0.80 0.19 0.19 0.09 0.09 6.40 4.30 0.45 0.09 0.09 0.20 0
Nom 1.00 0.22 6.50 6.40 BSC. 4.40 0.65 BSC. 0.60 1.00 REF. 12 REF. 12 REF.
Max 1.20 0.15 1.05 0.30 0.25 0.20 0.16 6.60 4.50 0.75 8
PT2303 V1.2
- 16 -
December, 2007
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2303
Notes: 1. Dimensioning and tolerancing per ASME Y14.5M-1994. 2. Controlling Dimension: Millimeters 3. Dimension D does not include mold flash, protrusions or gate burrs. Mold flash, protrusions or gate burrs shall not exceed 0.15 per end. 4. Dimension E1 does not include interlead flash or protrusion. Interlead flash or protrusion shall not exceed 0.25 per side. 5. Dimension b does not include dambar protrusion. Allowable dambar protrusion shall be 0.08 mm total in excess of the b dimension at maximum material condition. Dambar cannot be located on the lower radius or the foot. Minimum space between protrusion and adjacent lead is 0.07 mm. 6. N is the maximum number of terminal positions for the specified package length. Depopulation is allowed, but only under the following conditions: - Depopulation may reduce N by increments of four leads only. - Only end leads may be removed. - Leads must be symmetrically arranged with respect to datum A (Note 10) to avoid any array shifting. 7. Terminal numbers are shown for reference only. 8. Datum A and B to be determined at datum plane H. 9. Dimensions D and E1 to be determined at datum plane H. 10. This dimension applies only to variations with an even number of leads per side. For variations with an odd number of leads per side, the center lead must be coincident with the package centerline, datum A. 11. Cross section B-B to be determined at 0.10 to 0.25 mm from the lead tip. 12. Details of the pin 1 identifier are optional, but must be located within the zone indicated. 13. D1 and E2 minimum dimensions of thermally enhanced types are variables depending on device function (die paddle size). D1 and E2 maximum dimensions can be equal to D/E1 maximum dimensions. End user should verify actual size of exposed thermal pad for specific device application. 14. A1 is defined as the vertical distance from the seating plane to the lowest point on the package body excluding the lid and or thermal enhancement on cavity down package configurations. 15. Caution should be taken during design, assembly and processing to prevent deposited board solder from holding the leads up off the board. This is applicable to thermal enhanced variations where A1 dimension is allowed to be zero. 16. Refer to JEDEC MO-153 Variation AC JEDEC is the trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION
PT2303 V1.2
- 17 -
December, 2007

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