A8284SB

更新时间： 2024-11-08 22:26:51

品牌	Logo	应用领域
急速微 - ALLEGRO		稳压器输出元件
页数	文件大小	规格书
8页	178K
描述
TWO-OUTPUT LNB SUPPLY AND CONTROL-VOLTAGE REGULATOR

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A8284SB 数据手册

8284

ADVANCE INFORMATION

(Subject to change without notice)

December 22, 2000

TWO-OUTPUT LNB SUPPLY AND

CONTROL-VOLTAGE REGULATOR

Intended for analog and digital satellite receivers, the low noise block

converter regulator (LNBR) is a monolithic linear and switching voltage

regulator designed to provide power and interface signals to the LNB

downconverter via the coaxial cable. Because most satellite receivers have two

antenna ports, the output voltage of the regulator is available at one of two

logic-selectable output terminals (LNBA, LNBB). If the device is in stand-by

mode (EN terminal LOW), both regulator outputs are disabled, allowing the

antenna downconverters to be supplied and controlled by other satellite

receivers sharing the same coaxial cable. Similar single-output devices, with a

bypass function for slave operation in single-dish dual-receiver systems, are the

A8283SB/SLB.

A8284SLB

OSEL

OLF

24 EXTM

23 VINT

VBULK

PUMPX

LNBB

21 VPUMP

CPUMP

GND

The regulator outputs are set to 12, 13, 18, or 20 V by the VSEL terminals.

Additionally, it is possible to increase the selected voltage by 1 V to compen-

sate for the voltage drop in the coaxial cable (LLC terminal HIGH).

GND

18 GND

ENT

The LNBR combines a tracking switching regulator and low-noise linear

regulators. Logic inputs (VSEL0, VSEL1, and LLC) select the desired output

voltage. A tracking current-mode buck converter provides the linear regulator

input voltage that is set to the output voltage plus typically 0.8 V. This

maintains constant voltage drop across the linear regulators while permitting

adequate voltage range for tone injection.

SENSE

LNBA 99

LX 10

16 EN

BUCK

15 VSEL0

REG.

VSEL1

LLC

VIN

The device is supplied in a 24-pin plastic DIP with batwing tabs

(A8284SB), or a 24-lead SOIC power-tab package (A8284SLB). In both cases,

the power tab is at ground potential and needs no electrical isolation.

TCAP

FEATURES

Dwg. PP-072-1A

Complete Interface for Two LNBs Remote Supply and Control

LNB Selection and Stand-By Function

Built-In Tone Oscillator Factory Trimmed to 22 kHz, Facilitates

DiSEqC™ (a trademark of EUTELSAT) Encoding

Full Modulation With No Load

Tracking Switch-Mode Power Converter for Lowest Dissipation

Externally Adjustable Short-Circuit Protection

LNB Short-Circuit Protection and Diagnostics

Auxiliary Modulation Input

Note that the A8284SB (dual in-line package)

and A8284SLB (small-outline IC package) are

electrically identical and share a common

terminal number assignment.

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, V_IN.......................... 47 V

Output Current, I_O.... Internally Limited

Logic Input Voltage Range,

Cable Length Compensation

Internal Over-Temperature Protection

V_I................................... -0.5 V to +7 V

Flag Output Voltage, V_OLF.................. 7 V

Operating Temperature Range,

This device incorporates features that have patents pending.

T_A............................... -20°C to +85°C

Storage Temperature Range,

T_S............................. -40°C to +150°C

Always order by complete part number, e.g., A8284SLB .

12 3 4 5 6 7 8

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与A8284SB相关器件

型号	品牌	获取价格	描述	数据表
A8284SLB	ALLEGRO	获取价格	TWO-OUTPUT LNB SUPPLY AND CONTROL-VOLTAGE REGULATOR
A8285	ALLEGRO	获取价格	LNB Supply and Control Voltage Regulator
A8285SLB	ALLEGRO	获取价格	LNB Supply and Control Voltage Regulator
A8285SLBTR	ALLEGRO	获取价格	Analog Circuit, 1 Func, PDSO16, BATWING, PLASTIC, SOIC-16
A8285SLBTR-T	ALLEGRO	获取价格	Analog Circuit, 1 Func, PDSO16, BATWING, LEAD FREE, PLASTIC, SOIC-16
A8286	ALLEGRO	获取价格	Dual LNB Supply and Control Voltage Regulator
A8286SETTR-T	ALLEGRO	获取价格	Dual Switching Controller, Current-mode, 3.8A, 384kHz Switching Freq-Max, BCDMOS, QFN-28
A8286SETTR-TB	ALLEGRO	获取价格	Dual LNB Supply and Control Voltage Regulator
A8287	ALLEGRO	获取价格	LNB Supply and Control Voltage Regulator
A8287SLB	ALLEGRO	获取价格	LNB Supply and Control Voltage Regulator

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