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Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2300
DESCRIPTION
The PT2300 is a power amplifier utilizing CMOS Technology specially designed for audio purpose. It can deliver 2W x 2 power output to the 4 load. 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. The built-in volume controller can change the output volume by an external supplied DC voltage. 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 (Vcc=6V, THD=1%, RL=4) Low harmonics distortion (0.03%) Include 32 steps volume controller SE and BTL modes operation Suppress the pop and click noise when mode changed Shutdown function, turn on can into save mode (Icc<0.7A) Built-in overheat protect
APPLICATIONS
* * * * LCD monitor (for TV) Portable audio Multimedia speakers Other audio applications
PT2300 V1.0
-1-
December, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2300
BLOCK DIAGRAM
Rf Ri Vo1 20K 20K
+
+
Voltage Bypass and De-Pop Noise 32 steps DC Control Volume
+
Vin2 Vo2
Ri 20K Power Management
Rf 20K
Vcc Shutdown GND
+
AMP2N
+
DC Vol
PT2300 V1.0
-2-
-
Bypass
-
-
-
Vin1
AMP1N AMP1P AMP2P
-OUT1
+OUT1
+
SE/BTL -OUT2 +OUT2
December, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2300
PIN CONFIGURATION
S h u t do w n Vcc DC Vo l V o1 V in 1 V in 2 V o2 GND 1 2 3 4 5 6 7 8 P T 2 30 0 16 15 14 13 12 11 10 9 +O UT 1 Vcc - OU T1 Byp a ss S E /B TL - OU T2 Vcc +O UT 2
PIN DESCRIPTION
Pin Name Shutdown Vcc DC Vol Vo1 Vin1 Vin2 Vo2 GND +OUT2 Vcc -OUT2 SE/BTL Bypass -OUT1 Vcc +OUT1 I/O I I I I I I O O I O O O O Description Pin No. Shutdown pinEntire IC into the shutdown mode when this pin 1 connected to the Vcc, Supply voltage input 2 DC Volume control input pin 3 Channel 1 output for external feedback circuit 4 Channel 1 audio input 5 Channel 2 audio input 6 Channel 2 output for external feedback circuit 7 Ground 8 Channel 2 output (+) 9 Supply voltage input Channel 2 output (-) 11 Output mode select, connected to the Vcc for SE mode or 12 GND for BTL mode Internal bias reference bypassing 13 Channel 1 output (-) 14 Supply voltage input 15 Channel 1 output (+) 16
PT2300 V1.0
-3-
December, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2300
FUNCTION DESCRIPTION
POWER SUPPLY
The operating voltage of PT2300 is from 3V to 6V, In general operation 5V is recommended. When the supply voltage less then 3V the IC can work properly, but the distortion reading will rise. After the supply voltage over 6.5V, the higher stand-by current consumption will rising the temperature on chip surface
SHUTDOWN
When the DC supply still powered the chip Vcc, pull-up the shutdown pin to the Vcc level will take the chip into the shutdown mode. After the shutdown mode is active the total current consumption is less than 0.7A, 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 Vcc GND Output state Shutdown ON Normal
INPUT GAIN ADJUST
The output gain of the PT2300 can be adjust by the external resistor, in normal operation 0dB gain setting is recommended, please refer to the application circuit. If the source output level is not so high (ex :< 2Vpp), input gain can be increase to get the proper volume. The minimum value of the input series resistance is 10K for the modest input impedance. To make sure the input stage will not be distortion by overload, please confirm the input signal level, for the gain set please refer to the following table: Operating voltage VDD=3V VDD=5V Input gain = -6dB Vin <5Vpp Vin <8Vpp Input gain = 0dB Vin <2.5Vpp Vin<4Vpp Input gain = +6dB Vin <1.25Vpp Vin<2Vpp
SE/BTL MODE SWITCHING
PT2300 have two output mode, SE (Single-Ended) or BTL (Bridge-Tied Load). When driving a speaker load suggestion set to the BTL mode for get the more power output. And driving a 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 SE/BTL pin, please refer to following table: SE/BTL Vcc GND Mode SE BTL
PT2300 V1.0
-4-
December, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2300
OVER TEMPERATURE PROTECTION
The PT2300 has a built-in over temperature protection circuit, it will turn off all power output when the chip temperature over 120, the chip will return to normal operation automatically after the temperature cool down to 80.
POP AND CLICK SURPPRESS
A power amplifier uses single supply voltage may almost have noise on output in the power-on period. It is because of the output DC potential needs time to stable on 1/2Vcc, the period relative with the capacitance on the Bypass pin. Higher CB value will extend the stable time, and also can suppress the noise when 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. Recommend parts values please refer to application circuit.
VOLUME CONTROLLER
The PT2300 has a built-in 32 steps volume controller, output volume is determinate by the voltage applied on the DC Vol pin. Higher DC voltage means more output level, the relation between the volume setup and DC Vol, please refer the following table. [Supply voltage 5V, DC Vol input voltage showing by percentage of Vcc] Step 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Volume (dB) 0 -1.5 -3 -4.5 -6 -7.5 -9 -10.5 -12 -13.5 -15 -16.5 -18 -19.5 -21 -22.5 Voltage range (%VCC) High Vcc 64.1 63.1 61.1 60.4 57.8 56.4 53.8 52.1 48.7 47.5 45.4 44.7 41.8 40.4 37.8 Low 64.0 62.6 60.9 59.2 57.6 55.7 53.8 51.3 48.5 46.8 45.1 43.3 41.6 39.5 37.4 35.4 Step 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Volume (dB) -24 -25.5 -27 -28.5 -30 -31.5 -33 -34.5 -36 -37.5 -39 -40.5 -42 -43.5 -45 MUTE Voltage range (%VCC) High 36.0 29.9 28.7 26.6 26.0 23.2 21.8 19.3 17.2 13.7 12.4 10.2 9.5 6.7 5.2 2.7 Low 29.7 28.0 26.3 24.6 22.9 20.9 18.9 15.9 13.4 11.6 9.8 8.0 6.3 4.2 2.1 GND
PT2300 V1.0
-5-
December, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2300
If an ordinary potential meter is use to decide the DC_Vol level, the volume setting is just to rotating the shaft knob of potential meter to got desire volume, an extra indicator is not necessary. The output volume is respect to the current DC_Vol level after power ON. Please take note that there is a slight variance between the volume attenuation between different PT2300 chips at the same DC control voltage. Thus, to obtain the same level of volume the control voltage may differ to from chip to chip. Applying the same voltage at the DC_Vol pin, the attenuation drift may vary up to 4dB for different PT2300 chips.
0 -10 -20 -30 Attenuation (dB) -40 -50 -60 -70 -80 -90 -100 0 1 2 3 4 5 DC_Volume_Voltage (V)
PT2300 V1.0
-6-
December, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2300
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), PT2300 in 2W + 2W output power dissipation is probably PDISS = ( Po / eff ) - Po = 2.6W The maximum chip conjunction temperature is 150. Exceeding this temperature will damage the chip, assuming the outside environment air temperature is 50C. From the chip conjunction dissipation to external environment thermal resistance JA should be: JA = ( 150 - 50 ) / 2.6 = 38.4/W The PT2300 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, no need extra heat sink, only utilize the ground (copper foil) of PCB to heat dissipation.
PT2300 V1.0
-7-
December, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2300
ABSOLUTE MAXIMUM RATINGS
Parameter Symbol Condition Min. Max. Unit Supply Voltage Vcc 0 7 V Operating Temperature Topr -40 +85 Storage Temperature Tstg -65 +150 Maximum Input Voltage Vimax -0.3 Vcc+0.3 V Maximum Input Current Iimax * -10 +10 mA Note: * Input pins surge current can be reached 100mA will not induce the CMOS latched up.
PACKAGE THERMAL CHARACTERISTIC
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
PT2300 V1.0
-8-
December, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2300
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, Vcc=5V, bandwidth=22~22KHz) Parameter Symbol Condition Supply Voltage Vcc SE Mode Operating Current Is BTL Mode Shutdown=ON Two Channels Gain Gerr RIN=RF=20K Error Po=0.2W, RL=4 THD+N THD Po=1W, RL=4 Po=50mW, RL= 32 THD=1%, RL=8 THD=10%, RL=8 THD=1%, RL=4 BTL THD=10%, RL=4 Power Output Po THD=1%, RL=4, VCC=6V THD=1%, RL=32 SE THD=10%, RL=32 Signal-to-Noise Ratio SNR A-weighted Residual Noise Vno A-weighted Output Offset Voff DC Vol = 0V, +OUT ~ -OUT BTL Channel Separation CS F=1KHz SE Power Signal-to-Noise BTL PSRR F=1KHz Repel Rate SE DC Vol=5V F=1KHz Volume Control Range Vatt DC Vol=17%Vcc Volume Control Step Vstep Vatt=0 ~ -45dB Mute mute DC Vol=0V Overheat close Temperature Protect TH Back to work Shutdown ON VDD=3 ~ 5V Shutdown Voltage VSD Shutdown pin Shutdown OFF SE SE/BTL Voltage VSB VDD= 3 ~ 5V BTL Min. 3 6 8 0.2 -1 0.03 0.06 0.03 1.0 1.2 1.4 1.8 1.9 80 100 85 25 25 85 77 58 52 -1 -44 1.3 -85 0.5 0.8 Typ. 5 8 10 0.7 0 0.05 0.08 0.05 1.1 1.4 1.6 2.0 2.0 85 110 90 40 50 88 80 60 55 0 -45 1.5 -88 120 80 0.6 0.2 0.9 0.1 Max. 6 12 14 1 +1 0.07 0.15 0.07 1.2 1.6 1.8 2.1 2.2 90 120 91 50 100 91 83 63 58 +1 -46 1.7 -90 0.3 0.2 mW dB V mV dB dB dB dB dB Vcc Vcc Unit V mA A dB %
W
PT2300 V1.0
-9-
December, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2300
APPLICATION CIRCUIT
Vcc Shutdown SW OFF Vcc 3 Volume Control VR10KB ON 2 0.1
1 2 3
20K
Shutdown Vcc DC Vol Vo1 Vin1 Vin2 Vo2 GND
+OUT1 16 Vcc 15
Vcc
Control Pin 1K + 220 F + 2.2 F Vcc 100K 100K + Headphone
1
-OUT1 14 Bypass 13
4 5 6
1 F CH1-IN
+ +
20K
PT2300
SE/BTL 12 -OUT2 11 Vcc 10 +OUT2 9
1 F CH2-IN
20K
220 F 1K
20K
7 8
0.1 F
+ 10 F
PT2300 V1.0
- 10 -
December, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2300
ORDER INFORMATION
Valid Part No. PT2300 PT2300-S PT2300 (L) PT2300-S (L) Package Type 16-Pin, DIP, 300mil 16-Pin, SOP, 300mil 16-Pin, DIP, 300mil 16-Pin, SOP, 300mil Top Code PT2300 PT2300-S PT2300 PT2300-S
Notes: 1. (L), (C) or (S) = Lead Free 2. The Lead Free mark is put in front of the date code.
PT2300 V1.0
- 11 -
December, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2300
PACKAGE INFORMATION
16 PINS, DIP, 300MIL
PT2300 V1.0
- 12 -
December, 2005
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
PT2300
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 eA measured 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.
PT2300 V1.0
- 13 -
December, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2300
16 PINS, SOP, 300MIL
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
PT2300 V1.0
- 14 -
December, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2300
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 protrusionsshall 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.
PT2300 V1.0
- 15 -
December, 2005

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