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参数资料
| 型号： | A8284SLB |
| 元件分类： | 稳压器 |
| 英文描述： | 0.73 A SWITCHING REGULATOR, 384 kHz SWITCHING FREQ-MAX, PDSO22 |
| 封装： | POWER, SOIC-24 |
| 文件页数： | 5/8页 |
| 文件大小： | 156K |
| 代理商： | A8284SLB |
8284
TWO-OUTPUT LNB SUPPLY AND
CONTROL-VOLTAGE REGULATOR
www.allegromicro.com
5
The ENT (Tone Enable) terminal activates the internal
tone signal, modulating the dc output with a
±0.3 V, 22
kHz symmetrical waveform. The internal oscillator is
factory trimmed to provide a tone of 22 kHz
± 2 kHz. No
further adjustment is required. The internal oscillator
operates the buck converter at 16 times the tone fre-
quency.
Burst coding of the 22 kHz tone can be accomplished,
due to the fast response of the ENT input and rapid tone
response. This allows implementation of the DiSEqC
protocols.
To improve design flexibility and to allow implemen-
tation of proposed LNB remote control standards, an
analog modulation input terminal is available (EXTM).
An appropriate dc blocking capacitor must be used to
couple the modulating signal source to the EXTM termi-
nal. If external modulation is not used, the EXTM termi-
nal can be left open.
The output linear regulators will sink and source
current. This feature allows full modulation capability
into capacitive loads as high as 0.25
F.
The programmed output voltage rise and fall times
can be set by an internal 25 k
resistor and an external
capacitor located on the TCAP terminal. Although any
value of capacitor is permitted, practical values are
typically 0.001
F to 0.02 F. This feature only affects
the turn on and programmed voltage rise and fall times.
Modulation is unaffected by the choice of TCAP. This
terminal can be left open if voltage rise and fall time
control is not required.
Two terminals are dedicated to the over-current
protection/monitoring: SENSE and OLF. The LNB output
is current limited. The short-circuit protection threshold is
set by the value of an external resistor, RS, between
terminals 3 and 8. RS = VOM(th)/IOM where VOM(th) is the
current-limiting threshold voltage and IOM is the desired
current limit value. The minimum recommended value
for RS is 0.17 .
In operation, the short-circuit protection produces
current fold-back at the input due to the tracking con-
verter. If the output is shorted the linear regulator will
limit the output current to IOM. The tracking converter
will maintain a constant voltage drop of 0.8 V across the
linear regulator. This condition results in typically 550
mW dissipation (IOM x 0.8 V). Short-circuit or thermal
shutdown activation will cause the OLF terminal, an open-
drain diagnostic output flag, to go LOW.
Thermal resistance:
DIP — RθJA = 40°C/W, RθJT = 6°C/W,
SOIC — RθJA = 77°C/W, RθJT = 6°C/W.
RθJA is measured on typical two-sided PCB with
minimal copper ground area. For the SOIC, adding
3.57 in2 copper ground area will reduce the thermal
resistance to 49
°C/W (2.6 W allowable package power
dissipation at 25
°C). See Application Note 29501.5,
Improving Batwing Power Dissipation.
The device junction temperature should be kept below
150
°C. Thermal shut-down circuitry turns off the device
if junction temperature exceeds +165
°C typically.
FUNCTIONAL DESCRIPTION
The products described here are manufactured under one or more
U.S. patents or U.S. patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be
required to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support devices or systems without express written approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsi-
bility for its use; nor for any infringement of patents or other rights of
third parties which may result from its use.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A8285 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:LNB Supply and Control Voltage Regulator |
| A8285SLB | 功能描述:IC REG LNB SUPPLY/CTRL 16-SOIC RoHS:否 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) |
| A8285SLB-T | 制造商:Allegro MicroSystems LLC 功能描述: |
| A8285SLBTR | 功能描述:IC REG LNB SUPPLY/CTRL 16-SOIC RoHS:否 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) |
| A8285SLBTR-T | 功能描述:IC LNB SUPPLY/VOLTAGE REG 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
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