PTC PT2300

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 × 2 power output to the 4Ω 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 × 2 (Vcc=6V, THD=1%, RL=4Ω)
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<0.7µA)
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
20K
Vo1
+
-
Vin1
20K
-OUT1
AMP1N
+
-
Bypass
Voltage
Bypass and
De-Pop Noise
32 steps
DC Control
Volume
+
+OUT1
AMP1P
+
SE/BTL
-
Vin2
Rf
Vo2
Ri
20K
Vcc
Shutdown
+
20K
-OUT2
AMP2N
Power
Management
GND
+
+OUT2
AMP2P
DC Vol
PT2300 V1.0
-2-
December, 2005
Tel: 886-2-66296288
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URL: http://www.princeton.com.tw
2W x 2 Class AB Audio Power Amplifier
PT2300
PIN CONFIGURATION
S h u t do w n
1
16
+O UT 1
Vcc
Vcc
2
15
DC Vo l
3
14
- OU T1
V o1
4
13
Byp a ss
V in 1
5
12
S E /B TL
V in 2
6
11
- OU T2
V o2
7
10
Vcc
GND
8
9
P T 2 30 0
+O UT 2
PIN DESCRIPTION
Pin Name
I/O
Shutdown
I
Vcc
DC Vol
Vo1
Vin1
Vin2
Vo2
GND
+OUT2
Vcc
-OUT2
O
SE/BTL
I
Bypass
-OUT1
Vcc
+OUT1
O
O
O
O
PT2300 V1.0
I
I
I
I
I
O
Description
Pin No.
Shutdown pin。Entire 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
-3-
December, 2005
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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 0.7µA, 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 10KΩ 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
PT2300 V1.0
-4-
Mode
SE
BTL
December, 2005
Tel: 886-2-66296288
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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=2.2µF, 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
Volume
(dB)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
0
-1.5
-3
-4.5
-6
-7.5
-9
-10.5
-12
-13.5
-15
-16.5
-18
-19.5
-21
-22.5
PT2300 V1.0
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
-5-
Step
Volume
(dB)
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
-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
December, 2005
Tel: 886-2-66296288
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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
Attenuation (dB)
-30
-40
-50
-60
-70
-80
-90
-100
0
1
2
3
4
5
DC_Volume_Voltage (V)
PT2300 V1.0
-6-
December, 2005
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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:
θJA = (TJ(max) – TA) ÷ PDISS
PDISS = IC dissipation power
TJ (max) = Maximum chip conjunction temperature
TA = external environment temperature
θ 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 50°C. From the chip conjunction dissipation to
external environment thermal resistance θJA should be:
θJA = ( 150 – 50 ) ÷ 2.6 = 38.4℃/W
The PT2300 chip conjunction to case thermal resistance θJC is 26℃ /W. Therefore the heat sink
thermal resistance should be:
θJA –θJC = 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
PT2300 V1.0
Symbol
θJA
θJC
-8-
Condition
Ta=25℃
Value
Unit
88.8
℃/W
26
℃/W
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=20KΩ
Error
Po=0.2W, RL=4Ω
THD+N
THD
Po=1W, RL=4Ω
Po=50mW, RL= 32Ω
THD=1%, RL=8Ω
THD=10%, RL=8Ω
THD=1%, RL=4Ω
BTL
THD=10%, RL=4Ω
Power Output
Po
THD=1%, RL=4Ω,
VCC=6V
THD=1%, RL=32Ω
SE
THD=10%, RL=32Ω
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
PT2300 V1.0
-9-
Min.
3
6
8
0.2
Typ.
5
8
10
0.7
Max.
6
12
14
1
Unit
V
-1
0
+1
dB
0.03
0.06
0.03
1.0
1.2
1.4
1.8
0.05
0.08
0.05
1.1
1.4
1.6
2.0
0.07
0.15
0.07
1.2
1.6
1.8
2.1
1.9
2.0
2.2
80
100
85
25
25
85
77
58
52
-1
-44
1.3
-85
0.5
0.8
-
85
110
90
40
50
88
80
60
55
0
-45
1.5
-88
120
80
0.6
0.2
0.9
0.1
90
120
91
50
100
91
83
63
58
+1
-46
1.7
-90
0.3
0.2
mA
µA
%
W
mW
dB
µV
mV
dB
dB
dB
dB
dB
℃
Vcc
Vcc
December, 2005
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2W x 2 Class AB Audio Power Amplifier
PT2300
APPLICATION CIRCUIT
Vcc
Shutdown SW
OFF
Vcc
3
Volume Control
VR10KB
0.1µ
2
20K
1µ F
+
1µ F
CH2-IN
Shutdown
2
Vcc
+OUT1 16
+
20K
3
DC Vol
4
Vo1
5
Vcc 15
Control Pin
-OUT1 14
Bypass 13
PT2300
+ 2.2 µ F
Vcc
100K
SE/BTL 12
Vin1
+ 220 µ F
100K
Headphone
+
20K
20K
6
Vin2
7
Vo2
8
GND
-OUT2 11
220 µ F
1K
Vcc 10
+OUT2 9
0.1 µ F
PT2300 V1.0
Vcc
1K
1
CH1-IN
1
ON
- 10 -
+
10 µ F
December, 2005
Tel: 886-2-66296288
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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
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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
PT2300
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
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
α
PT2300 V1.0
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
- 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