A8284SB Просмотр технического описания (PDF) - Allegro MicroSystems
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A8284SB Datasheet PDF : 8 Pages
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8284
TWO-OUTPUT LNB SUPPLY AND
CONTROL-VOLTAGE REGULATOR
FUNCTIONAL BLOCK DIAGRAM
47 V
MAX
RS
+
VINT
VOLTAGE
REG.
EN
5V
ENT
CHARGE
PUMP
176 kHz
BOOST VOLTAGE
–
+
÷2
BUCK
CONV.
7V
VREF
352 kHz
–
OVER-
+
CURRENT
–
+
150 mV
800 mV
–
25 kΩ
1
+
0
5 kΩ
÷8 &
WAVESHAPING
22 kHz TONE
TSD
OLF
OVER-CURRENT
5 kΩ
1 kΩ
TCAP
OSEL
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
VSEL0
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
VSEL1
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
LLC
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
VLNBA(typ)
13 V
14 V
18 V
19 V
12 V
13 V
20 V
21 V
Low
Low
Low
Low
Low
Low
Low
Low
VLNBB(typ)
Low
Low
Low
Low
Low
Low
Low
Low
13 V
14 V
18 V
19 V
12 V
13 V
20 V
21 V
Output Voltage Select Table
115 Northeast Cutoff, Box 15036
2
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2000, Allegro MicroSystems, Inc.
LNBB
EXTM
LNBA
Dwg. FP-051
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