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參數資料
| 型號： | TPA2015D1YZHT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.7 W, 1 CHANNEL, AUDIO AMPLIFIER, BGA16 |
| 封裝： | 1.954 X 1.954 MM, 0.50 MM PITCH, DSBGA-16 |
| 文件頁數： | 6/27頁 |
| 文件大小： | 1016K |
| 代理商： | TPA2015D1YZHT |
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LimiterLevel
SupplyVoltage
Class-DVoltage
SupplyCurrent
Phase 1
Phase 2
Phase 3
Phase 4
Phase 5
Phase 6
Inflectionpoint
AudioSignal
VBAT Supply Voltage V
V
O
U
T
Maximum
Output
Voltage
Vp
2.3
2.6
2.9
3.2
3.5
3.8
4.1
4.4
4.7
5.0
1.0
2.0
3.0
4.0
5.0
6.0
VIN = 0.707 VRMS
VIN = 0.564 VRMS
VIN = 0.475 VRMS
RL = 8 + 33 H
RAGC = 27 k
f = 1 kHz
Gain = 15.5 dB
SLOS638 – MAY 2010
www.ti.com
Figure 23. Relationship Between Supply Voltage, Current, Limiter Level, and Output Audio Signal
SpeakerGuard with Varying Input Levels
SpeakerGuard protects speakers by decreasing gain during large output transients. Figure 24 shows the
maximum output voltage at different input voltage levels. The load is 8
Ω and the gain is 15.5 dB (6 V/V).
Figure 24. MAXIMUM OUTPUT VOLTAGE vs SUPPLY VOLTAGE
A 0.707 VRMS sine-wave input signal forces the output voltage to 4.242 VRMS, or 6.0 VPEAK. Above 3.9 V supply,
the boost converter voltage sags due to high output current, resulting in a peak Class-D output voltage of about
5.4 V. As the supply voltage decreases below 3.9 V, the limiter level decreases. This causes the gain to
decrease, and the peak Class-D output voltage lowers.
With a 0.564 VRMS input signal, the peak Class-D output voltage is 4.78 V. When the supply voltage is above
3.45 V, the output voltage remains below the limiter level, and the gain stays at 15.5 dB. Once the supply drops
below 3.45 V, the limiter level decreases below 4.78 V, and SpeakerGuard decreases the gain.
The same rationale applies to the 0.475 VRMS input signal. Although the supply voltage may be below the
inflection point, audio gain does not decrease until the Class-D output voltage is above the limiter level.
14
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPA2015D1
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