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参数资料
| 型号： | A8292SETTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC REG LNB SUPPLY/CONTROL 28-MLP |
| 标准包装： | 1 |
| 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： | 2 |
| 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： | 标准包装 |
| 产品目录页面： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1187-6 |
A8292
Dual LNB Supply and Control Voltage Regulator
ODT (Overcurrent Disable Time)
If the LNB output current exceeds 600 mA, typical, for more than
48 ms, then the LNB output will be disabled and the OCP bit will
be set (see figure 1).
Short Circuit Handling
If the LNB output is shorted to ground, the LNB output current
will be clamped to 600 mA, typical. If the short circuit condition
lasts for more than 48 ms, the A8292 will be disabled and the
OCP bit will be set.
Tone Detection
A 22 kHz tone detector is provided in each channel of the A8292
solution. The detector extracts the tone signal and provides it as
an open-drain signal on the TDO pins. 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.
Table 1. Detection Thresholds for Tone Generation Options
1
Auto-Restart
After a short circuit condition occurs, the host controller should
periodically re-enable the A8292 to check if the short circuit has
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 A8292. This current increase can be as high as
600 mA, typical, for as long as required, up to a maximum of
Option
(Fig. 1)
TMODE
TGATE
EXTM
Guaranteed
Detection
Threshold
1
1
Control
0/1
1
400
Transmit
2 3
1 0
Control
0/1
22 kHz
Control logic
0/1 signal,
continuous
400 300
4
0
1
Control
gated
22 kHz
logic
signal
300
Receive
n.a. n.a.
0 1
At least one
must be 0 to
prevent tone
transmission
300 400
48 ms. The 8292 can also provide up to 500 mA per channel indi-
vidually, or 900 mA to both channels simultaneously, for a period
(mV PP )
Rejection
of up to 2 s (see figure 1). Operating at this level for a longer
period is not recommended.
Threshold
(mV PP )
100
100
100
100
100
100
ODT (Overcurrent Disable Timing) Mode Timing Diagram
I OUT(LNB X ) ,
per channel
+A
0
600 mA, typ.
per channel
500 mA for one channel,
and 900 mA total current
450 mA for one channel,
and 750 mA total current
Safe Operating Area
t
≤ t DIS
2000 ms
≤ t DIS
≤ t DIS
Start-up LNB Reconfiguration
Continuous Operation
Continuous Operation
LNB
Reconfiguration
Short
Circuit
Figure 1. ODT (Overcurrent Disable Timing) Mode Timing Diagram
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
8
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