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8282 の電気的特性と機能

8282のメーカーはAllegroです、この部品の機能は「(8281) LNB SUPPLY AND CONTROL-VOLTAGE REGULATORS」です。


製品の詳細 ( Datasheet PDF )

部品番号 8282
部品説明 (8281) LNB SUPPLY AND CONTROL-VOLTAGE REGULATORS
メーカ Allegro
ロゴ Allegro ロゴ 




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8282 Datasheet, 8282 PDF,ピン配置, 機能
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 .

1 Page





8282 pdf, ピン配列
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.
www.allegromicro.com
3


3Pages


8282 電子部品, 半導体
8281 AND 8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
APPLICATIONS INFORMATION
Component selection:
Input capacitor, CIN. An electrolytic capacitor
should be located as close to the device VIN terminal
as possible. The input current is a square wave with
fast rise and fall times so the capacitor must be able to
handle the rms current without excessive temperature
rise. The value of this capacitor is not as important as
the ESR. The worst-case current is with maximum
load current, minimum VIN, and maximum VLNB
(highest switch duty cycle). Choose a capacitor with
a ripple current rating greater than
Icin = ILNB x 1.2 x VLNB(max)/VIN(min)
Buck inductor, L1. A 100-µH power inductor is
appropriate for all operating conditions. The rated
saturation current of the inductor must be greater than
1.3-A. To maximize efficiency, the dc resistance
should be less than 350-m.
Clamp diode, D1. A Schottky diode is required at
the switching node LX. This diode should be rated at
1.5 times the maximum load current.
Output capacitor, CBULK. A low-ESR (<200-m)
electrolytic capacitor is recommended to minimize
the ripple voltage. Less than 50-mV peak-to-peak is a
reasonable goal.
Vripple(PP) = ESR x Iripple(max)
where Iripple(max) = VBULK(min) x (1 – [VBULK(min)/VIN(max)]) /
(L1 x 352-kHz).
Output capacitor, CLNB. Increasing the output
capacitance, CLNB, will attenuate noise. However,
this is limited by the requirement for low cable
capacitance for 22-kHz tone transmission.
Also, because the linear regulator sink current is
limited, high values of output capacitance combined
with low levels of output current can cause overshoot
of the 22-kHz tone. Operating points above the line
in the following graph will not have excessive over-
shoot.
125
100
75
MINIMAL OVERSHOOT
50
EXCESSIVE OVERSHOOT
25
0
0
Layout notes:
0.5 1.0
OUTPUT CAPACITANCE IN µF
1.5
Dwg. GP-074
1. The printed wiring board should use a heavy
ground plane. A two-sided board with ground planes
on both sides of the board is most desirable. Several
copper vias under the device can be used to connect
the ground planes and enhance thermal performance.
2. For optimum electrical and thermal performance,
the device should be soldered directly onto the board.
3. Keep the sense resistor traces as short and as wide
as possible to lower trace resistance.
4. Connect the bypass capacitors as close to the
device as possible. The lower value ceramic capaci-
tors should be closer to the device than the
electrolytics. The supply voltage, VIN, should be
decoupled with an electrolytic capacitor placed as
close to the device as possible.
5. Place the TCAP capacitor as close to the device as
possible.
115 Northeast Cutoff, Box 15036
6 Worcester, Massachusetts 01615-0036 (508) 853-5000

6 Page



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