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A8283 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - LNB SUPPLY AND CONTROL-VOLTAGE REGULATOR - Allegro

भाग संख्या A8283
समारोह LNB SUPPLY AND CONTROL-VOLTAGE REGULATOR
मैन्युफैक्चरर्स Allegro 
लोगो Allegro लोगो 
पूर्व दर्शन
1 Page
		
<?=A8283?> डेटा पत्रक पीडीएफ

A8283 pdf
8283
PRELIMINARY INFORMATION
(subject to change without notice)
June 18, 2002
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATOR
A8283SLB
OSEL 1
OLF 2
VBULK 3
24 EXTM
23 VINT
22 PUMPX
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 down
converter via the coaxial cable. If the device is in stand-by mode (EN terminal
LOW), the regulator output is disabled, allowing the antenna downconverters to
be supplied or controlled by other satellite receivers sharing the same coaxial
cable. Similar two-output LNB supply and control voltage regulators are the
A8284SB/SLB.
MIOUT 4
21 VPUMP
For slave operation in single-dish dual-receiver systems, the bypass
function is implemented by an electronic switch between the master input
MI 5
GND 6
YGND 7
RSENSE 8
OLNB 99
TLX 10
VIN 11
CTCAP 12
BUCK
REG.
20 CPUMP
19 GND
18 GND
17 ENT
16 EN
15 VSEL0
14 VSEL1
13 LLC
FADwg. PP-072A
Note that the A8283SB (dual in-line package)
Tand A8283SLB (small-outline IC package) are
electrically identical and share a common
terminal number assignment.
CABSOLUTE MAXIMUM RATINGS
ASupply Voltage, VIN .......................... 47 V
TOutput Current, IO ............................ 1.0 A
Logic Input Voltage Range,
NVI ................................... -0.5 V to +7 V
Bypass Switch Current,
OISW ........................ Internally Limited
CFlag Output Voltage, VOLF .................. 7 V
terminal (MI) and the LNB terminal, leaving all LNB power and control
functions to the master receiver. This electronic switch is closed if the device
is powered, EN is HIGH, and OSEL is LOW.
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). The
LNBR combines a tracking switching regulator and low-noise linear regulator.
Logic inputs (VSEL0, VSEL1, and LLC) select the desired output voltage. A
tracking current-mode buck converter provides the linear regulator with an
input voltage that is set to the output voltage plus typically 0.8 V. This main-
tains constant voltage drop across the linear regulator while permitting ad-
equate voltage range for tone injection.
The device is supplied in a 24-pin plastic DIP with batwing tabs
(A8283SB), or a 24-lead SOIC power-tab package (A8283SLB). In both cases,
the power tab is at ground potential and needs no electrical isolation.
FEATURES
s Short-Circuit Protected Bypass Function for Slave Operation
s LNB Selection and Stand-By Function
s Built-In Tone Oscillator Factory Trimmed to 22 kHz, Facilitates
DiSEqC™ (a trademark of EUTELSAT) Encoding
s Full Modulation With No Load
s Tracking Switch-Mode Power Converter for Lowest Dissipation
s Externally Adjustable Short-Circuit Protection
s LNB Short-Circuit Protection and Diagnostics
s Auxiliary Modulation Input
s Cable Length Compensation
s Internal Over-Temperature Protection
Operating Temperature Range,
TA ............................... -20°C to +85°C
Storage Temperature Range,
This device incorporates features that have patents pending.
TS ............................. -40°C to +150°C
Always order by complete part number, e.g., A8283SLB .

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डाउनलोड[ A8283 Datasheet.PDF ]


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