参数资料
| 型号： | NCP2830MUTXG |
| 厂商： | ON Semiconductor |
| 文件页数： | 4/15页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO CLASS D 20UQFN |
| 产品变化通告： | Product Obsolescence 24/Jan/2011 |
| 标准包装： | 3,000 |
| 类型： | D 类 |
| 输出类型： | 1-通道（单声道） |
| 在某负载时最大输出功率 x 通道数量： | 1.2W x 1 @ 8 欧姆 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 特点： | 差分输入，关闭 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 20-UQFN（3x3） |
| 封装/外壳： | 20-UFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
NCP2830
http://onsemi.com
12
5 V. Internally, the class D amplifier starts to operate when
VB equals 4.5 V.
When VSD is low, the charge pump is deactivated and the
VB voltage is maintain to the VDD value. During this
shutdown mode, it is not possible to sink current through the
VB pin. Figure 26 depicts the turn ON/OFF sequence.
Figure 26. Turn ON/OFF Sequence
VDD
0
5 V
4.5 V
0
VDD
Audio
0.9 x VDD
OUTP
OUTM
SD
VD
VDD
TPrecharge Tstart
Toff
In order to maximize the global efficiency, the system
permanently monitors the battery voltage and changes its
operating mode:
When VDD is less than 3.8 V (typ) the system operates
in 2X mode.
Between 3.8 V and 4.65 V the system operates in 1.5X
mode.
If VDD is greater than 4.65 V the system switches
automatically to Wire Mode operation (VB = VDD)
WM pin
This external pin allows controlling the activation of the
boost whatever the battery voltage is. For example, if no
power is required, there is no need to boost the supply
voltage of the class D amplifier. In that case, disabling the
boost by a high logic on WM pin, allows supplying directly
the class D by the battery voltage (VB = VDD) and
optimizing the efficiency.
CLASS D AMPLIFIER
The NCP2830 is based on a mono class D audio amplifier.
This structure is composed by a preamplifier stage, a PWM
stage and a HBridge stage.
Gain selection
The preamplifier stage consists in applying a gain to the
input signal selectable by a dedicated digital pin GS.
The gain setting is given by the following truth table:
GS
Gain Av V/V
Input Impedance kW
0
2
15
1
4
7.5
30 kHz Builtin Low Pass Filter
This filter allows directly connecting a DAC or a CODEC
to the NCP2830 input without risk of output noise increase
due to a mixing frequency with the DAC/CODEC output
frequency. Consequently, the best operation with DACs or
CODECs is guarantee without need of additional external
components.
Input Capacitors Cin
Due to its fully differential architecture the NCP2830 does
not require input capacitors if the differential source is
biased from 0.5 V to VDD 0.8 V. However, it is possible to
use input capacitors when the differential source is not
biased or in single ended configuration. In this case it is
necessary to take into account the corner frequency which
can influence the low frequency response of the NCP2830.
The following equation will help to choose the adequate
input capacitors.
fC +
1
2p @ Zin @ Cin
(eq. 1)
With Zin the input impedance of the NCP2830.
Overcurrent Protection
This protection allows detecting an over current in the
HBridge. When the current is higher than 2 A the HBridge
is put in high impedance. When the short circuit is removed
or the current is lower, the NCP2830 go back to normal
operation. This protection allows avoiding overcurrent due
to a bad assembly (Output shorted together, to VB or to
ground).
DESIGN PROCEDURE
Components Selection
Use very low ESR ceramic capacitors (X5R/X7R) will
help to reduce the output resistance of the charge pump and
thus improve the system efficiency.
Input Capacitor (C1 and C2)
NCP2830 is aimed to be connected on the battery line. For
such a device, it is mandatory to get as low ripple as possible
so as to avoid conducted emission on the battery line. As
stated above, the noise generated by turnon and turnoff
transients is optimized by a controlled switching speed.
Placing two 4.7
mF/6.3 V (0603 size) input capacitors as
close as possible to PDD and AVDD pin will also help to
avoid any disturbance for other sensitive parts also
connected on the battery line.
Flying Capacitors (C3 and C4)
As stated above, the value of these capacitors has a direct
impact on the load regulation and output resistance of the
charge pump. The converter must provide a regulated DC
voltage with a sine wave AC current, the frequency of which
is twice the audio signal frequency. Selecting a 2.2
mF/6.3 V
(0603 size) will help regarding the load regulation and the
device’s ability to provide sufficient current drive.
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相关代理商/技术参数 |
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|---|---|
| NCP2830MUTXGEVB | 功能描述:BOARD EVAL NCP2830 RoHS:是 类别:编程器，开发系统 >> 评估板 - 音频放大器 系列:* 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
| NCP2860 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:AC-DC Offline Switching Controllers/Regulators |
| NCP2860/D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:300 mA Very Low Noise LDO |
| NCP2860_06 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:300 mA Very Low Noise, Low Dropout Linear Regulator |
| NCP2860DM277R2 | 功能描述:低压差稳压器 - LDO 2.77V or ADJ 300mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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