CONTROL-VOLTAGE REGULATORS. 8282 Datasheet

8282 Datasheet PDF, Equivalent


Part Number

8282

Description

(8281) LNB SUPPLY AND CONTROL-VOLTAGE REGULATORS

Manufacture

Allegro

Total Page 14 Pages
PDF Download
Download 8282 Datasheet PDF


8282 Datasheet
8281 AND
8282
A8282SLB
NC 1
OLF 2
VBULK 3
NC 4
NC 5
GND 6
GND 7
SENSE 8
LNB 99
LX 10 BUCK
VIN 11
REG.
TCAP 12
24 EXTM
23 VINT
22 PUMPX
21 VPUMP
20 CPUMP
19 GND
18 GND
17 ENT
16 EN
15 VSEL0
14 VSEL1
13 LLC
Dwg. PP-072-2
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Supply Voltage, VIN ........................... 47-V
Output Current, ILNB .... Internally Limited
Output Voltage Range, VLNB .. -1-V to +22-V
Logic Input Voltage Range,
VI ................................... -0.3-V to +7-V
Flag Output Voltage, VOLF ................... 7-V
Operating Temperature Range,
TA ................................. -20°C to +85°C
Junction Temperature, TJ ................ +150°C
Storage Temperature Range,
TS .............................. -55°C to +150°C
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
Intended for analog and digital satellite receivers, these low-noise
block converter regulators (LNBRs) are monolithic linear and switching
voltage regulators specifically designed to provide the power and
interface signals to the LNB down converter via the coaxial cable. If the
device is in standby mode (EN terminal low), the regulator output is
disabled, allowing the antenna down converters to be supplied or
controlled by other satellite receivers sharing the same coaxial cable. In
this mode, the device will limit the output reverse current.
The A8281SLB output is set to 13 or 18-V by the VSEL terminal. It
is supplied in a 16-lead SOIC power-tab package. The power tabs are at
ground potential and need no electrical isolation.
The A8282SLB output is 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 compensate for the voltage drop in the coaxial cable (LLC
terminal high). It is supplied in a 24-lead SOIC power-tab package.
The power tabs are at ground potential and need no electrical isolation.
The A8282SLB is an improved version of the A8283SLB, without a
bypass switch.
FEATURES
s LNB selection and standby function
s Built-in tone oscillator factory trimmed to 22-kHz, facilitates
DiSEqC™ (a trademark of EUTELSAT) encoding
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 Internal over-temperature protection
s Reverse-current protection
s Cable length compensation (A8282SLB only)
These devices incorporate features that have patents pending.
Always order by complete part number, e.g., A8282SLB .

8282 Datasheet
8281 AND 8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
FUNCTIONAL BLOCK DIAGRAM
and typical application
0.1 µF
0.1 µF
VIN
+ 47 V MAX
100 µF
100 µH
100 µF
+
RS 200 m
VINT
(A8282 ONLY)
VOLTAGE
REG.
EN
5V
ENT
CHARGE
PUMP
176 kHz
BOOST
VOLTAGE
7V
+
BUCK
CONV.
VREF
352 kHz
÷2
+
OVER-
CURRENT
+
25 k
900 mV
+
135 mV
÷8 &
WAVESHAPING
22 kHz TONE
TSD
OLF
OVER-
CURRENT
5 k
5 k
1 k
DiSEqC TERMINATION
15
LNB 180 µH
0.22 µF
EXTM
0.1 µF
A8281SLB
EXTM 1
OLF 2
VBULK 3
GND 4
SENSE 5
LNB 6
LX 7
VIN 8
BUCK
REG.
16 PUMPX
15 VPUMP
14 CPUMP
13 GND
12 ENT
11 EN
10 VSEL1
9 TCAP
Dwg. PP-072-3
TCAP
10 nF
Dwg. FP-051-2
A8281SLB Output Voltage Select Table
VSEL1
L
H
VLNB
13 V
18 V
A8282SLB Output Voltage Select Table
VSEL0
L
L
L
L
H
H
H
H
VSEL1
L
L
H
H
L
L
H
H
LLC
L
H
L
H
L
H
L
H
VLNB
13 V
14 V
18 V
19 V
12 V
13 V
20 V
21 V
115 Northeast Cutoff, Box 15036
2 Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2003 Allegro MicroSystems, Inc.


Features Datasheet pdf 8281 AND 8282 A8282SLB NC OLF VBULK NC N C GND GND SENSE LNB LX VIN TCAP 1 2 3 2 4 23 22 EXTM VINT PUMPX VPUMP CPUMP GND GND ENT EN VSEL0 VSEL1 LLC LNB SUPPLY AND CONTROL-VOLTAGE REGULATORS Intende d for analog and digital satellite rece ivers, these low-noise block converter regulators (LNBRs) are monolithic linea r and switching voltage regulators spec ifically designed to provide the power and interface signals to the LNB down c onverter via the coaxial cable. If the device is in standby mode (EN terminal low), the regulator output is disabled, allowing the antenna down converters t o be supplied or controlled by other sa tellite receivers sharing the same coax ial cable. In this mode, the device wil l limit the output reverse current. The A8281SLB output is set to 13 or 18-V b y the VSEL terminal. It is supplied in a 16-lead SOIC power-tab package. The p ower tabs are at ground potential and n eed no electrical isolation. The A8282S LB output is set to 12, 13, 18, or 20-V by the VSEL terminals. .
Keywords 8282, datasheet, pdf, Allegro, 8281, LNB, SUPPLY, AND, CONTROL-VOLTAGE, REGULATORS, 282, 82, 2, 828, 82, 8, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




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