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CONTROL-VOLTAGE REGULATORS. 8282 Datasheet

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CONTROL-VOLTAGE REGULATORS. 8282 Datasheet
















8282 REGULATORS. Datasheet pdf. Equivalent













Part

8282

Description

(8281) LNB SUPPLY AND CONTROL-VOLTAGE REGULATORS



Feature


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 .
Manufacture

Allegro

Datasheet
Download 8282 Datasheet


Allegro 8282

8282; to provide the power and interface signa ls to the LNB down converter via the co axial cable. If the device is in standb y mode (EN terminal low), the regulator output is disabled, allowing the anten na down converters to be supplied or co ntrolled by other satellite receivers s haring the same coaxial cable. In this mode, the device will limit the output reverse current. T.


Allegro 8282

he 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 A8282 SLB 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 v oltage drop in the.


Allegro 8282

coaxial cable (LLC terminal high). It i s supplied in a 24-lead SOIC power-tab package. The power tabs are at ground p otential and need no electrical isolati on. The A8282SLB is an improved version of the A8283SLB, without a bypass swit ch. Data Sheet 27448.2c CHARGE PUMP B UCK REG. 4 5 6 7 8 9 9 10 11 12 21 20 19 18 17 16 15 14 13 VOLTAGE CONTROL Dwg. PP-072-2 FE.





Part

8282

Description

(8281) LNB SUPPLY AND CONTROL-VOLTAGE REGULATORS



Feature


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 .
Manufacture

Allegro

Datasheet
Download 8282 Datasheet




 8282
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
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.




 8282
8281 AND 8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
ELECTRICAL CHARACTERISTICS: unless otherwise noted at TJ < 125°C, CLNB = 0.1 µF,
4.5-V + VLNB < VIN < 47-V
Characteristic
Supply Voltage Range
Output Voltage Error
(reference Output Voltage
Select table)
Output Reverse Current
Buck Switch On Resist.
Buck Switch Current Limit
Switching Frequency
Linear Reg. Volt. Drop
Logic Input Voltage
Logic Input Current
Supply Current
Tone Characteristics
Symbol
VIN
EVLNB
IRLNB
rDS(on)
IBSM
fO
VBUCK
VIL
VIH
IIH
IIN
Test Conditions
Operating
6 mA ILNB 750 mA, ENT = L
12 mA ILNB 750 mA, ENT = H,
average VLNB
EN = L, VLNB = 22 V, VIN = 22 V or oating
TJ = 25°C, ILNB = 750 mA
TJ = 125°C, ILNB = 750 mA
16 x ftone
VSENSE – VLNB, ENT = L, ILNB = 750 mA
VIH = 5 V
Outputs disabled (EN = L)
EN = H, ILNB = 0
Min.
4.5 +VLNB
1
320
700
2
Limits
Typ. Max.
— 47
0 ±4.5
0 ±4.5
1
0.57
0.84
352
900
<1.0
0.25
6
5
0.67
0.94
2.5
384
1100
0.8
10
1
10
Units
V
%
%
mA
A
kHz
mV
V
V
µA
mA
mA
Tone Frequency
ftone ENT = H
20 22 24 kHz
Tone Amplitude
Vtone(PP)(ENT) ENT = H, 12 mA ILNB 750 mA
400 650 900 mV
Tone Duty Cycle
dctone
ENT = H, 12 mA ILNB 750 mA
40 — 60 %
Tone Rise or Fall Time
tr, tf ENT = H, 12 mA ILNB 750mA
5 10 15 µs
External Modulation
Tone Amplitude
Vtone(PP)(EXTM) f = 22 kHz square wave, ILOAD = 12 mA to 400 550 800 mV
450 mA, VIN = 100mV to 125 mV;
VPP ac coupled
External Modulation Input
Voltage Range
VEXTM(PP) AC coupled
100 — 125 mV
External Modulation Input
Impedance
ZEXTM
f = 22 kHz
4 — 10 k
continued next page
NOTES: 1. Typical data is for design information only.
2. Negative current is dened as coming out of (sourcing) the specied device terminal.
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