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PDF PT2303-HT Data sheet ( Hoja de datos )
| Número de pieza | PT2303-HT | |
| Descripción | 2W x 2 Class AB Audio Power Amplifier | |
| Fabricantes | PTC | |
| Logotipo |  |
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PT2303
2W x 2 Class AB Audio Power Amplifier
DESCRIPTION
The PT2303 is a power amplifier utilizing CMOS
Technology specially designed for audio purpose. It
can deliver 2W × 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.
APPLICATIONS
• LCD monitor (for TV)
• Portable audio
• Multimedia speakers
• Other audio applications
FEATURES
• CMOS Technology
• Stereo input
• Output power 2W × 2 (4Ω)
• 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<0.5µA)
• Built-in overheat protect
BLOCK DIAGRAM
Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan
1 page  
PT2303
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=2.2µF, 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. The recommended value of DC blocking capacitor is 1µF, and the capacitor of output terminal
connected to 32Ω headphone is 220µF. 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.
HEAT DISSIPATION
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.
V1.3
5 December 2010
5 Page 
20PINS, HTSSOP, 173MIL
PT2303
Symbol
A
A1
A2
b
c
D
D1
e
E
E1
E2
L
L1
θ
Notes:
1. Refer to JEDEC MO-153 ACT
2. Unit: mm
Option 1
Symbol
D1
E2
V1.3
Min.
-
0.05
0.80
0.19
0.09
6.40
2.20
4.30
1.50
0.45
0°
Typ.
-
-
1.00
-
-
6.50
-
0.65 BSC.
6.40 BSC.
4.40
-
0.60
1.0 REF.
-
Max.
1.20
0.15
1.05
0.30
0.20
6.60
-
4.50
-
0.75
8°
Min.
3.79
2.60
Typ.
3.99
2.80
11
Max.
4.19
3.00
December 2010
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet PT2303-HT.PDF ] | |
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