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参数资料
| 型号： | A8293SETTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 7/19页 |
| 文件大小： | 0K |
| 描述： | IC REG LNB BOOST/LINEAR 28QFN |
| 标准包装： | 9,000 |
| 应用： | 转换器，模拟和数字式卫星信号 STB 接收器/SatTV |
| 输入电压： | 9 V ~ 16 V |
| 输出数： | 1 |
| 输出电压： | 可调 |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-VFQFN |
| 供应商设备封装： | 28-QFN |
| 包装： | 带卷 (TR) |
A8293
Single LNB Supply and Control Voltage Regulator
been removed. Consecutive startup attempts should allow at least
2 s of delay between restarts.
In-Rush Current
At start-up or during an LNB reconfiguration event, a tran-
sient surge current above the normal DC operating level can be
provided by the A8293. This current increase can be as high as
700 mA, typical, for as long as required, up to a maximum of
48 ms.
Tone Generation
The A8293 solution offers four options for tone generation,
providing maximum flexibility to cover every application. The
EXTM
TMODE
TGATE
Tone
(LNB Ref)
EXTM pin (external modulation), in conjunction with the I 2 C?
control bits: TMODE (tone modulation) and TGATE (tone gate),
provide the necessary control. The TMODE bit controls whether
the tone source is either internal or external (via the EXTM pin).
Both the EXTM pin and TGATE bit determine the 22 kHz con-
trol, whether gated or clocked.
Four options for tone generation are shown in figure 1. Note
that when using option 4, when EXTM stops clocking, the LNB
volts park at the LNB voltage, either plus or minus half the tone
signal amplitude, depending on the state of EXTM. For example,
if the EXTM is held low, the LNB DC voltage is the LNB pro-
grammed voltage minus 325 mV (typical).
LNB (V)
Option 1 – Use internal tone, gated by the TGATE bit.
EXTM
TMODE
TGATE
Tone
(LNB Ref)
LNB (V)
Option 2 – Use internal tone, gated by the EXTM pin.
EXTM
TMODE
TGATE
Tone
(LNB Ref)
LNB (V)
Option 3 – Use external tone, gated by the TGATE bit.
EXTM
TMODE
TGATE
Tone
(LNB Ref)
Option 4 – Use external tone.
Figure 1. Options for tone generation
LNB (V)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
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相关代理商/技术参数 |
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|---|---|
| A8294 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Single LNB Supply and Control Voltage Regulator |
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| A8296SESTR-T | 功能描述:IC REG LNB SGL SUPPLY 16-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
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