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參數(shù)資料
| 型號： | NLMD5820 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | 2.65 W Filterless Class-D Audio Amplifier with Integrated Dual SPST Switch |
| 中文描述： | 2.65糯無濾波器D類音頻放大器集成雙路SPST開關(guān) |
| 文件頁數(shù)： | 17/21頁 |
| 文件大小： | 228K |
| 代理商： | NLMD5820 |
NLMD5820
http://onsemi.com
17
DESCRIPTION INFORMATION
Detailed Description
The basic structure of the amplifier portion of the
NLMD5820 is composed of one analog pre-amplifier, a
pulse width modulator and an H-bridge CMOS power stage.
The first stage is externally configurable with gain-setting
resistor R
i
and the internal fixed feedback resistor R
f
(the
closed-loop gain is fixed by the ratios of these resistors) and
the other stage is fixed. The load is driven differentially
through two output stages.
The differential PWM output signal is a digital image of
the analog audio input signal. The human ear is a band pass
filter regarding acoustic waveforms, the typical values of
which are 20 Hz and 20 kHz. Thus, the user will hear only
the amplified audio input signal within the frequency range.
The switching frequency and its harmonics are fully filtered.
The inductive parasitic element of the loudspeaker helps to
guarantee a superior distortion value.
Power Amplifier
The output PMOS and NMOS transistors of the amplifier
have been designed to deliver the output power of the
specifications without clipping. The channel resistance
(R
on
) of the NMOS and PMOS transistors is typically 0.4
.
Turn On and Turn Off Transitions in Case of 9 Pin
Flip-Chip Package
In order to eliminate “pop and click” noises during
transition, the output power in the load must not be
established or cutoff suddenly. When a logic high is applied
to the shutdown pin, the internal biasing voltage rises
quickly and, 4 ms later, once the output DC level is around
the common mode voltage, the gain is established slowly
(5.0 ms). This method to turn on the device is optimized in
terms of rejection of “pop and click” noises. Thus, the total
turn on time to get full power to the load is 9 ms (typical).
The device has the same behavior when it is turned-off by
a logic low on the shutdown pin. No power is delivered to the
load 5 ms after a falling edge on the shutdown pin. Due to
the fast turn on and off times, the shutdown signal can be
used as a mute signal as well.
Turn On and Turn Off Transitions in Case of UDFN8
In case of UDFN8 package, the audio signal is established
instantaneously after the rising edge on the shutdown pin.
The audio is also suddenly cut once a low level is sent to the
amplifier. This way to turn on and off the device in a very fast
way also prevents from “pop & click” noise.
Shutdown Function
The device enters shutdown mode when the shutdown
signal is low. During the shutdown mode, the DC quiescent
current of the circuit does not exceed 1.5 A.
Current Breaker Circuit
The maximum output power of the circuit corresponds to
an average current in the load of 820 mA.
In order to limit the excessive power dissipation in the
load if a short-circuit occurs, a current breaker cell shuts
down the output stage. The current in the four output MOS
transistors are real-time controlled, and if one current
exceeds the threshold set to 1.5 A, the MOS transistor is
opened and the current is reduced to zero. As soon as the
short-circuit is removed, the circuit is able to deliver the
expected output power.
This patented structure protects the NLMD5820. Since it
completely turns off the load, it minimizes the risk of the
chip overheating which could occur if a soft current limiting
circuit was used.
Dual SPST Switch
The NLMD5820 features an integrated dual SPST analog
switch. The control for the switch is operated independently
of the amplifier, allowing the audio system a choice between
routing signals through the amplifier or letting them pass
unaffected through the switch. When the switch is open, it
maintains significant off isolation to minimize the effects of
the amplifier output on the system.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NLMD5820MUTAG | 功能描述:音頻放大器 ANLOG SWCH AUDIO AMP RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| NLN | 制造商:LITTELFUSE 制造商全稱:Littelfuse 功能描述:NLN/NLS Class K5 Fuses |
| NLN 20 AMP | 制造商:Littelfuse 功能描述:Fuse;Cylinder;One-Time;20A;Class K5;Dims 0.56x2";Cartridge;250/600VAC;Clip |
| NLN 30 AMP | 制造商:Littelfuse 功能描述:Fuse;Cylinder;One-Time;30A;Class K5;Dims 0.56x2";Cartridge;250/600VAC;Clip |
| NLN002 | 制造商:Littelfuse 功能描述:Fuse Class K5 2A 250V Slow Blow 2-Pin Holder |
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