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A8284SLB PDF预览

A8284SLB

更新时间: 2024-02-25 18:29:39
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

A8284SLB 数据手册

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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  
1
2
3
4
24 EXTM  
23 VINT  
VBULK  
PUMPX  
22  
LNBB  
NC  
21 VPUMP  
CPUMP  
GND  
5
6
7
8
20  
19  
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  
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  
17  
LNBA 9
LX 10  
16 EN  
BUCK  
15 VSEL0  
11  
12  
REG.  
VSEL1  
LLC  
VIN  
14  
13  
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  
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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.  
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ABSOLUTE MAXIMUM RATINGS  
Supply Voltage, VIN .......................... 47 V  
Output Current, IO .... Internally Limited  
Logic Input Voltage Range,  
Cable Length Compensation  
Internal Over-Temperature Protection  
VI ................................... -0.5 V to +7 V  
Flag Output Voltage, VOLF .................. 7 V  
Operating Temperature Range,  
This device incorporates features that have patents pending.  
TA ............................... -20°C to +85°C  
Storage Temperature Range,  
TS ............................. -40°C to +150°C  
Always order by complete part number, e.g., A8284SLB .  

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