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参数资料
| 型号： | A8290SETTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC VOLTAGE REG SGL LNB 28-QFN |
| 标准包装： | 9,000 |
| 应用： | 转换器，模拟和数字式卫星信号接收器 |
| 输入电压： | 8 V ~ 16 V |
| 输出数： | 1 |
| 输出电压： | 12.7 V ~ 20.4 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-VFQFN 裸露焊盘 |
| 供应商设备封装： | 28-QFN/MLP 裸露焊盘（5x5） |
| 包装： | 带卷 (TR) |
A8290
Short Circuit Handling
Single LNB Supply and Control Voltage Regulator
1
2
3
4
n.a.
n.a.
If the LNB output is shorted to ground, the LNB output current
will be clamped to 900 mA, typical. If the short circuit condition
lasts for more than 48 ms, the A8290 will be disabled and the
OCP bit will be set.
Auto-Restart
After a short circuit condition occurs, the host controller should
periodically reenable the A8290 to check if the short circuit has
been removed. Consecutive startup attempts should allow at least
5 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 A8290. This current increase can be as high as
Tone Detection
A 22 kHz tone detector is provided in the A8290 solution. The
detector extracts the tone signal and provides it as an open-drain
signal on the TDO pin. The maximum tone out error is ±1 tone
cycle, and the maximum tone out delay with respect to the input
is 1 tone cycle. Detection thresholds are given in table 1.
Tone Generation
The A8290 solution offers four options for tone generation,
providing maximum flexibility to cover every application. The
Table 1. Detection Thresholds for Tone Generation Options
Transmit Receive
Option
(Fig. 1)
900 mA, typical, for as long as required, up to a maximum of
48 ms.
DC current
The A8290 can handle up to 700 mA per channel individually,
during continuous operation.
TMODE
TGATE
EXTM
1
Control
0/1
1
1
1
Control
0/1
0
Control
0/1
22 kHz
logic
signal,
continuous
0
1
Control
gated
22 kHz
logic
signal
0 1
At least one must
be 0 to prevent
tone transmission
Guaranteed
Detection
Threshold
400
400
300
300
300
400
(mV PP )
Rejection
Threshold
(mV PP )
100
100
100
100
100
100
I OUT(LNB X )
+A
0
900 mA,
typical
700 mA
650 mA
Safe Operating Area
t
≤ t DIS
2000 ms
Start-up
Continuous Operation
≤ t DIS
Continuous Operation
≤ t DIS
LNB
Reconfiguration
Figure 1. ODT (Overcurrent Disable Timing) Mode Timing Diagram
Short
Circuit
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A8290SETTR-TB | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Single LNB Supply and Control Voltage Regulator |
| A8291 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Single LNB Supply and Control Voltage Regulator |
| A8291SETTR-T | 功能描述:IC VOLTAGE REG SGL LNB 28-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 |
| A8291SETTR-TB | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Single LNB Supply and Control Voltage Regulator |
| A8292 | 制造商:AMPEX 功能描述: |
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