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부품번호 | 8284 기능 |
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기능 | TWO-OUTPUT LNB SUPPLY AND CONTROL-VOLTAGE REGULATOR | ||
제조업체 | Allegro MicroSystems | ||
로고 | |||
전체 8 페이지수
8284
ADVANCE INFORMATION
(Subject to change without notice)
December 22, 2000
TWO-OUTPUT LNB SUPPLY AND
CONTROL-VOLTAGE REGULATOR
Intended for analog and digital satellite receivers, the low noise block
A8284SLB
converter regulator (LNBR) is a monolithic linear and switching voltage
regulator designed to provide power and interface signals to the LNB
OSEL 1
24 EXTM
downconverter via the coaxial cable. Because most satellite receivers have two
antenna ports, the output voltage of the regulator is available at one of two
OLF 2
23 VINT
logic-selectable output terminals (LNBA, LNBB). If the device is in stand-by
mode (EN terminal LOW), both regulator outputs are disabled, allowing the
VBULK 3
22 PUMPX
antenna downconverters to be supplied and controlled by other satellite
LNBB 4
YNC 5
GND 6
RGND 7
OSENSE 8
TLNBA 99
CLX 10 BUCK
AVIN 11
FTCAP 12
REG.
21 VPUMP
20 CPUMP
19 GND
18 GND
17 ENT
16 EN
15 VSEL0
14 VSEL1
13 LLC
TDwg. PP-072-1A
CNote that the A8284SB (dual in-line package)
and A8284SLB (small-outline IC package) are
Aelectrically identical and share a common
terminal number assignment.
NTABSOLUTE MAXIMUM RATINGS
Supply Voltage, VIN .......................... 47 V
OOutput Current, IO .... Internally Limited
CLogic Input Voltage Range,
receivers sharing the same coaxial cable. Similar single-output devices, with a
bypass function for slave operation in single-dish dual-receiver systems, are the
A8283SB/SLB.
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
regulators. Logic inputs (VSEL0, VSEL1, and LLC) select the desired output
voltage. A tracking current-mode buck converter provides the linear regulator
input voltage that is set to the output voltage plus typically 0.8 V. This
maintains constant voltage drop across the linear regulators while permitting
adequate voltage range for tone injection.
The device is supplied in a 24-pin plastic DIP with batwing tabs
(A8284SB), or a 24-lead SOIC power-tab package (A8284SLB). In both cases,
the power tab is at ground potential and needs no electrical isolation.
FEATURES
I Complete Interface for Two LNBs Remote Supply and Control
I LNB Selection and Stand-By Function
I Built-In Tone Oscillator Factory Trimmed to 22 kHz, Facilitates
DiSEqC™ (a trademark of EUTELSAT) Encoding
I Full Modulation With No Load
I Tracking Switch-Mode Power Converter for Lowest Dissipation
I Externally Adjustable Short-Circuit Protection
I LNB Short-Circuit Protection and Diagnostics
I Auxiliary Modulation Input
I Cable Length Compensation
I Internal Over-Temperature Protection
VI ................................... -0.5 V to +7 V
Flag Output Voltage, VOLF .................. 7 V
This device incorporates features that have patents pending.
Operating Temperature Range,
TA ............................... -20°C to +85°C
Storage Temperature Range,
TS ............................. -40°C to +150°C
Always order by complete part number, e.g., A8284SLB .
8284
TWO-OUTPUT LNB SUPPLY AND
CONTROL-VOLTAGE REGULATOR
ELECTRICAL CHARACTERISTICS
(unless otherwise noted).
at
TA
=
25°C,
ENT
=
L,
EN
=
H,
LLC
=
L,
VIN
=
24
V,
IOUT
=
50
mA
Characteristic
Overload Flag Logic Low
Overload Flag
Leakage Current
Symbol
VOL
IOZ
Test Conditions
IOL = 8 mA
VOH = 5.5 V
Min.
—
—
Limits
Typ. Max. Units
0.28 —
V
<1.0 — µA
Logic Input Voltage
Logic Input Current
Supply Current
Thermal Shutdown Temp.
Linear Regulator Voltage Drop
Switching Frequency
VIL
VIH
IIH
IIN
TJ
∆VBUCK
fO
VIH = 5 V
Outputs disabled (EN = L)
ENT = H, IO = 600 mA, VO = 13 V
VBULK – VO
16 • ftone
— — 0.8 V
2.0 —
—
V
— <1.0 — µA
— 0.5 — mA
— 382 — mA
— 165 — °C
— 0.8 —
V
320 352 384 kHz
115 Northeast Cutoff, Box 15036
4 Worcester, Massachusetts 01615-0036 (508) 853-5000
4페이지 8284
TWO-OUTPUT LNB SUPPLY AND
CONTROL-VOLTAGE REGULATOR
24
0.280
0.240
A8284SB
Dimensions in Inches
(controlling dimensions)
NOTE 1
13
0.014
0.008
0.430
MAX
0.300
BSC
0.210
MAX
1
0.070
0.045
6
7
1.280
1.230
12
0.100
0.005
BSC
MIN
0.015
MIN
0.022
0.014
0.150
0.115
Dimensions in Millimeters
(for reference only)
24 NOTE 1
13
0.355
0.204
7.11
6.10
Dwg. MA-001-25A in
10.92
MAX
7.62
BSC
5.33
MAX
1
1.77
1.15
6
7
32.51
31.24
12
2.54 0.13
BSC
MIN
0.39
MIN
0.558
0.356
3.81
2.93
NOTES: 1. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece.
2. Exact body and lead configuration at vendor’s option within limits shown.
3. Lead spacing tolerance is non-cumulative
4. Lead thickness is measured at seating plane or below.
Dwg. MA-001-25A mm
www.allegromicro.com
7
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