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参数资料
| 型号： | A8282SLBTR |
| 英文描述： | LNB Supply and Control Voltage Regulator |
| 中文描述： | LNB电源和控制稳压器 |
| 文件页数： | 8/10页 |
| 文件大小： | 350K |
| 代理商： | A8282SLBTR |
8281/8282
Power Dissipation.
The power dissipated and
operating junction temperature of the 8281 and 8282 can be
estimated to ensure the device operates within desired
thermal budget.
The total chip power is contributed by three components.
Pd_bias = V
IN
* (I
CCEN
- 4mA)
Pd_buck = I
LOAD
^2 * R
DSBUCK
* V
BULK
/V
IN
Pd_lin =
V
BUCK
* I
LOAD
P
TOT
= Pd_bias + Pd_buck + Pd_lin
Where V
BULK
=
V
BUCK
+ I
LOAD
* R
SENSE
+ V
LNB
I
CCEN
,
V
BUCK
, and R
DSBUCK
can be taken from the
specification table. R
DSBUCK
is a function of
junction termperature. The R
DSON
will rise
approximately 2.7mohm/°C.
The junction temperature can be estimated by:
T
J
= P
TOT
*
R
JA
+
T
A
OR
T
J
= P
TOT
*
R
JT
+
T
TAB
Where
R
JT
= 5.6°C /W
T
A
= Ambient Temperature °C
R
JA
= 50°C /W for A8282SLB
56°C /W for A8281SLB
R
JA
numbers for a typical two sided, 2 oz. copper, PC
board layout with copper ground plane of 1 square inch.
Additional copper ground plane area, multi- level boards, etc
can reduce the effective R
JA
.
DiSEqC
TM
.
The 22khz tone is specified to be compatible
to coaxial cable bus standards available from
www.eutelsat.com
. The A8282 LNB output will be able to
drive the DiSEqC termination network. This terminator
typically consists of a 180uH inductor, used to pass the dc
current with minimal loss, and a 15 ohm parallel resistor to
provide the recommended source impedance at 22khz.
Unidirectional communication systems such as DiSEqC 1.0
do not need this termination and the LNB output can be
directly connected to the coaxial cable.
13V to 18V Transition
. The LNB output can be rapidly
switched between a high and low setting as a method of
receiver to LNB communication. The TCAP capacitor will
control the slew rate based on the RC charging.
t
RISE/FALL
= 25K
*
C
TCAP
*
ln(V1/V2)
Small values of TCAP are used when the transition time is
desired to be less than a millisecond. In this case, the
minimum rise time is limited by the charge time of the
switching regulators output capacitor. This is dependent on
the LNB load current, peak current limit in the buck switch,
and the output amplitude change.
t
RISE
= C_bulk * (v2-v1)/(I_ave)
Where I_ave is the average current available to charge the
output capacitor and can be estimated by:
I_ave = 1.4A - I_load
Note that this is only a limitation due to the ability to charge
the output capacitor on a low to high change of the LNB
voltage. For high to low transitions, the output voltage will
be slew limited by TCAP.
The minimum value for TCAP should be 4.7nF.
相关PDF资料 |
PDF描述 |
|---|---|
| A8282SLB | LNB SUPPLY AND CONTROL-VOLTAGE REGULATORS |
| A87-1 | 10 TO 400 MHz TO-8 CASCADABLE AMPLIFIER |
| A88 | 5 TO 500 MHz CASCADABLE AMPLIFIER |
| A8902SLB | DC Motor Controller/Driver |
| A8903SLB | DC Motor Controller/Driver |
相关代理商/技术参数 |
参数描述 |
|---|---|
| A8282SLBTR-T | 功能描述:IC REG LNB SUPPLY/CTRL 24-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| A8283 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:LNB Supply and Control Voltage Regulator |
| A8283(DIP) | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Interface IC |
| A8283(SOIC) | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Interface IC |
| A8283SB | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:LNB SUPPLY AND CONTROL-VOLTAGE REGULATOR |
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