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A8283SB 데이터시트 PDF




Allegro MicroSystems에서 제조한 전자 부품 A8283SB은 전자 산업 및 응용 분야에서
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부품번호 A8283SB 기능
기능 LNB SUPPLY AND CONTROL-VOLTAGE REGULATOR
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A8283SB 데이터시트, 핀배열, 회로
8283
PRELIMINARY INFORMATION
(Subject to change without notice)
November 21, 2000
A8283SLB
OSEL 1
OLF 2
VBULK 3
MIOUT 4
MI 5
GND 6
GND 7
SENSE 8
LNB 99
LX 10
VIN 11
TCAP 12
BUCK
REG.
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-072A
Note that the A8283SB (dual in-line package)
and A8283SLB (small-outline IC package) are
electrically identical and share a common
terminal number assignment.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VIN .......................... 47 V
Output Current, IO .... Internally Limited
Logic Input Voltage Range,
VI ................................... -0.5 V to +7 V
Bypass Switch Current,
ISW ........................ Internally Limited
Flag Output Voltage, VOLF .................. 7 V
Operating Temperature Range,
TA ............................... -20°C to +85°C
Storage Temperature Range,
TS ............................. -40°C to +150°C
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATOR
Intended for analog and digital satellite receivers, the low-noise block
converter regulator (LNBR) is a monolithic linear and switching voltage
regulator designed to provide power and interface signals to the LNB down
converter via the coaxial cable. If the device is in stand-by mode (EN terminal
LOW), the regulator output is disabled, allowing the antenna downconverters to
be supplied or controlled by other satellite receivers sharing the same coaxial
cable. Similar two-output LNB supply and control voltage regulators are the
A8284SB/SLB.
For slave operation in single-dish dual-receiver systems, the bypass
function is implemented by an electronic switch between the master input
terminal (MI) and the LNB terminal, leaving all LNB power and control
functions to the master receiver. This electronic switch is closed if the device
is powered, EN is HIGH, and OSEL is LOW.
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 regulator.
Logic inputs (VSEL0, VSEL1, and LLC) select the desired output voltage. A
tracking current-mode buck converter provides the linear regulator with an
input voltage that is set to the output voltage plus typically 0.8 V. This main-
tains constant voltage drop across the linear regulator while permitting ad-
equate voltage range for tone injection.
The device is supplied in a 24-pin plastic DIP with batwing tabs
(A8283SB), or a 24-lead SOIC power-tab package (A8283SLB). In both cases,
the power tab is at ground potential and needs no electrical isolation.
FEATURES
I Short-Circuit Protected Bypass Function for Slave Operation
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
This device incorporates features that have patents pending.
Always order by complete part number, e.g., A8283SLB .




A8283SB pdf, 반도체, 판매, 대치품
8283
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATOR
EIOLUTE=C5T0RmICAAL(uCnHleAssRAotChTeErwRiIsSeTInCoSteadt).TA = 25°C, ENT = L, EN = H, OSEL = H, LLC = L, VIN = 24 V,
Limits
Characteristic
Symbol Test Conditions
Min. Typ. Max. Units
Overload Flag Logic Low
Overload Flag Leakage Current
Logic Input Voltage
Logic Input Current
Supply Current
Thermal Shutdown Temp.
Linear Regulator Voltage Drop
Switching Frequency
Bypass Switch Current Limit
Bypass Switch Voltage Drop
(MI to LNB)
VOL
IOZ
VIL
VIH
IIH
IIN
TJ
VBUCK
fO
IswM
Vsw
IOL = 8 mA
VOH = 5.5 V
VIH = 5 V
Outputs disabled (EN = L)
ENT = H, IO = 600 mA, VO = 13 V
VBULK – VO
16 • ftone
OSEL = L
OSEL = L, Isw = 300 mA
— 0.28 —
V
— <1.0 — µA
— — 0.8 V
2.0 —
V
— <1.0 — µA
— 0.5 — mA
— 382 — mA
— 165 — °C
— 0.8 —
V
320 352 384 kHz
630 900 — mA
— 0.15 —
V
115 Northeast Cutoff, Box 15036
4 Worcester, Massachusetts 01615-0036 (508) 853-5000

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A8283SB 전자부품, 판매, 대치품
8283
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATOR
24
0.280
0.240
A8283SB
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
0.015
MIN
0.022
0.014
12
0.100
0.005
BSC
MIN
0.150
0.115
Dwg. MA-001-25A in
Dimensions in Millimeters
(for reference only)
24 NOTE 1
13
7.11
6.10
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.
www.allegromicro.com
0.355
0.204
10.92
MAX
7.62
BSC
Dwg. MA-001-25A mm
7

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관련 데이터시트

부품번호상세설명 및 기능제조사
A8283SB

LNB SUPPLY AND CONTROL-VOLTAGE REGULATOR

Allegro MicroSystems
Allegro MicroSystems
A8283SLB

LNB SUPPLY AND CONTROL-VOLTAGE REGULATOR

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