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| 型号： | SA58637BS |
| 厂商： | NXP Semiconductors N.V. |
| 元件分类： | 音频放大器 |
| 英文描述： | 2 x 2.2 W BTL audio amplifier |
| 封装： | SA58637BS<SOT910-1 (HVQFN20)|<<http://www.nxp.com/packages/SOT910-1.html<1<Always Pb-free,; |
| 文件页数： | 18/22页 |
| 文件大小： | 156K |
| 代理商： | SA58637BS |
SA58637_1
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 25 February 2008
5 of 22
NXP Semiconductors
SA58637
2
× 2.2 W BTL audio amplier
8.
Functional description
The SA58637 is a two-channel BTL audio amplier capable of delivering 2
× 1.5 W output
power to an 8
load at THD+N = 10 % using a 6 V power supply. It is also capable of
delivering 2
× 2.2 W output power to an 8 load at THD+N = 10 % using a 9 V power
supply. Using the MODE pin, the device can be switched to standby and mute condition.
The device is protected by an internal thermal shutdown protection mechanism. The gain
can be set within a range of 6 dB to 30 dB by external feedback resistors.
8.1 Power amplier
The power amplier is a Bridge-Tied Load (BTL) amplier with a complementary
PNP-NPN output stage. The voltage loss on the positive supply line is the saturation
voltage of a PNP power transistor and on the negative side the saturation voltage of an
NPN power transistor. The total voltage loss is < 1 V.
8.2 Mode select pin (MODE)
The device is in Standby mode (with a very low current consumption) if the voltage at the
MODE pin is greater than VCC 0.5 V, or if this pin is oating. At a MODE voltage in the
range between 1.5 V and VCC 1.5 V the amplier is in a mute condition. The mute
condition is useful to suppress plop noise at the output, caused by charging of the input
capacitor. The device is in Active mode if the MODE pin is grounded or less than 0.5 V
(see Figure 6).
8.3 SELECT output conguration
The outputs differentially drives the speakers, so there is no need for coupling capacitors
(see Figure 3). If the voltage at the SELECT pin is in the range between 1.5 V and
VCC 1.5 V, or if it is kept oating, then both channels are operational. If the SELECT pin
is set to a logic LOW or grounded, then only the right channel is operational and the left
channel is in Standby mode. If the SELECT pin is set to logic HIGH or connected to VCC,
then only the left channel is operational and right channel is in Standby mode. Setting the
SELECT pin to logic LOW or a logic HIGH voltage results in a reduction of quiescent
current consumption by a factor of approximately 2. Switching the SELECT pin during
operation is not plop-free, because the input capacitor of the channel which is coming out
of standby needs to be charged rst. For plop-free channel selecting the device has rst to
be set in mute condition with the MODE pin (between 1.5 V and VCC 1.5 V). The
SELECT pin is then set to the new level and after a delay the MODE pin is set to a LOW
level. The delay needed depends on the values of the input capacitors and the feedback
resistors. Time needed is approximately 10
× C1 × (R1 + R2), so approximately
0.6 seconds for the values shown in Figure 3.
Table 4.
Control pins MODE and SELECT versus status of output channels
Control pin
Status of output channel
Typical Iq (mA)
MODE
SELECT
Left channel
Right channel
X[3]
standby
0
HVCC[4]
mute
15
LOW[5]
on
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SA58637BS,118 | 功能描述:音频放大器 DUAL 2.2W/CH. BTL RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| SA58637BS118 | 制造商:NXP Semiconductors 功能描述:IC AUDIO AMP AB 2.2W SON-20 |
| SA58637BS-T | 功能描述:音频放大器 DUAL 2.2W/CH. BTL AUDIO AMP RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| SA58640 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Low-voltage mixer FM IF system |
| SA58640DK | 功能描述:射频混合器 NB FM IF RECEIVER RoHS:否 制造商:NXP Semiconductors 频率范围: 转换损失——最大: 工作电源电压:6 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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