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A8281SLB Datasheet(PDF) 2 Page - Allegro MicroSystems

Part # A8281SLB
Description  LNB SUPPLY AND CONTROL-VOLTAGE REGULATORS
PDF  14 Pages
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A8281SLB Datasheet(HTML) 2 Page - Allegro MicroSystems

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



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