参数资料
型号: TPA4861DRG4
厂商: TEXAS INSTRUMENTS INC
元件分类: 音频/视频放大
英文描述: 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
封装: GREEN, PLASTIC, MS-012AA, SOIC-8
文件页数: 11/26页
文件大小: 623K
代理商: TPA4861DRG4
www.ti.com
SHUTDOWN MODE
USING LOW-ESR CAPACITORS
THERMAL CONSIDERATIONS
160
40
20
0
0.25
1.5
0.5
0.75
1
Free-Air
T
emperature
PO – Maximum Output Power – W
1.25
C
°
T A
80
60
120
100
140
RL = 16
RL = 8
VDD = 5 V
TPA4861
SLOS163C – SEPTEMBER 1996 – REVISED JUNE 2004
Table 2. Common Load Impedances vs Low-Frequency
Output Characteristics in SE Mode
RL
CC
LOWEST FREQUENCY
8
68 F
293 Hz
32
68 F
73 Hz
47,000
68 F
0.05 Hz
As Table 2 indicates, most of the bass response is attenuated into 8-
loads, while headphone response is
adequate and drive into line level inputs (a home stereo for example) is good.
The TPA4861 employs a shutdown mode of operation designed to reduce supply current, IDD(q), to the absolute
minimum level during periods of nonuse for battery-power conservation. For example, during device sleep modes
or when other audio-drive currents are used (i.e., headphone mode), the speaker drive is not required. The
SHUTDOWN input terminal should be held low during normal operation when the amplifier is in use. Pulling
SHUTDOWN high causes the outputs to mute and the amplifier to enter a low-current state, IDD(SD) ~ 0.6 A.
SHUTDOWN should never be left unconnected because amplifier operation would be unpredictable.
Low-ESR capacitors are recommended throughout this applications section. A real capacitor can be modeled
simply as a resistor in series with an ideal capacitor. The voltage drop across this resistor minimizes the
beneficial effects of the capacitor in the circuit. The lower the equivalent value of this resistance, the more the
real capacitor behaves like an ideal capacitor.
A prime consideration when designing an audio amplifier circuit is internal power dissipation in the device. The
curve in Figure 39 provides an easy way to determine what output power can be expected out of the TPA4861
for a given system ambient temperature in designs using 5-V supplies. This curve assumes no forced airflow or
additional heat sinking.
Figure 39. Free-Air Temperature vs Maximum Continuous Output Power
19
相关PDF资料
PDF描述
TPA4861Y 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC8
TPA5050RSARG4 SPECIALTY CONSUMER CIRCUIT, PQCC16
TPA5050RSAR SPECIALTY CONSUMER CIRCUIT, PQCC16
TPA5050RSATG4 SPECIALTY CONSUMER CIRCUIT, PQCC16
TPA5050RSAT SPECIALTY CONSUMER CIRCUIT, PQCC16
相关代理商/技术参数
参数描述
TPA-5 功能描述:保险丝 TELPOWER ALARM FUSE RoHS:否 制造商:Littelfuse 产品:Surface Mount Fuses 电流额定值:0.5 A 电压额定值:600 V 保险丝类型:Fast Acting 保险丝大小/组:Nano 尺寸:12.1 mm L x 4.5 mm W 安装风格: 端接类型:SMD/SMT 系列:485
TPA-5,0-ADV 制造商:PMK 功能描述:ADVANCED PROBE ACCESSORIES 5, 0MM 制造商:PMK 功能描述:ADVANCED PROBE ACCESSORIES 5, 0MM; Kit Contents:Probe Kit, 18 Piece; Body Diameter:5.0mm; For Use With:5mm PMK Probes; Primary Product 1:220mm Ground Lead with Crocodile Clips; Primary Product 2:Sprung Hook; Primary Product 3:Contact;RoHS Compliant: NA
TPA-5,0-BAS 制造商:PMK 功能描述:BASIC PROBE ACCESSORIES 5, 0MM 制造商:PMK 功能描述:BASIC PROBE ACCESSORIES 5, 0MM; Kit Contents:Probe Kit, 4 Piece; Body Diameter:5.0mm; For Use With:5mm PMK Probes; Primary Product 1:220mm Ground Lead with Crocodile Clips; Primary Product 2:Sprung Hook; Primary Product 3:Contact ;RoHS Compliant: NA
TPA-5,0-L-BAS 制造商:PMK 功能描述:BASIC PROBE ACCESSORIES 5, 0-L 制造商:PMK 功能描述:BASIC PROBE ACCESSORIES 5, 0-L; Kit Contents:Probe Kit, 4 Piece; Body Diameter:5.0mm; For Use With:5mm PMK Probes; Primary Product 1:220mm Ground Lead with Crocodile Clips; Primary Product 2:Sprung Hook; Primary Product 3:Contact ;RoHS Compliant: NA
TPA-50 功能描述:保险丝 TELPOWER ALARM FUSE RoHS:否 制造商:Littelfuse 产品:Surface Mount Fuses 电流额定值:0.5 A 电压额定值:600 V 保险丝类型:Fast Acting 保险丝大小/组:Nano 尺寸:12.1 mm L x 4.5 mm W 安装风格: 端接类型:SMD/SMT 系列:485