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參數(shù)資料
| 型號： | 8281 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | LNB SUPPLY AND CONTROL-VOLTAGE REGULATORS |
| 中文描述： | LNB電源與控制，電壓調(diào)節(jié)器 |
| 文件頁數(shù)： | 3/14頁 |
| 文件大?。?/td> | 375K |
| 代理商： | 8281 |
8281
AND
8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
www.allegromicro.com
3
ELECTRICAL CHARACTERISTICS: unless otherwise noted at T
J
< 125°C, C
LNB
= 0.1
μF,
4.5
-
V + V
LNB
< V
IN
< 47
-
V
Characteristic
Supply Voltage Range
Output Voltage Error
(reference Output Voltage
Select table)
Symbol
V
IN
E
VLNB
Test Conditions
Limits
Typ.
—
0
0
Min.
Max.
47
±4.5
±4.5
Units
V
%
%
Operating
6 mA
≤
I
LNB
≤
750 mA, ENT = L
12 mA
≤
I
LNB
≤
750 mA, ENT = H,
average V
LNB
EN = L, V
LNB
= 22 V, V
IN
= 22 V or
fl
oating
T
J
= 25°C, I
LNB
= 750 mA
T
J
= 125°C, I
LNB
= 750 mA
4.5 +V
LNB
—
—
Output Reverse Current
Buck Switch On Resist.
I
RLNB
r
DS(on)
—
—
—
1
1
5
mA
A
0.57
0.84
—
0.67
0.94
2.5
Buck Switch Current Limit
I
BSM
f
O
V
BUCK
V
IL
V
IH
I
IH
I
IN
Switching Frequency
Linear Reg. Volt. Drop
Logic Input Voltage
16 x f
tone
V
SENSE
– V
LNB
, ENT = L, I
LNB
= 750 mA
320
700
—
352
900
—
384
1100
0.8
kHz
mV
V
2
—
—
V
Logic Input Current
Supply Current
V
IH
= 5 V
Outputs disabled (EN = L)
EN = H, I
LNB
= 0
—
—
—
<1.0
0.25
6
10
1
10
μA
mA
mA
Tone Characteristics
Tone Frequency
Tone Amplitude
Tone Duty Cycle
Tone Rise or Fall Time
External Modulation
Tone Amplitude
f
tone
ENT = H
ENT = H, 12 mA
≤
I
LNB
≤
750 mA
ENT = H, 12 mA
≤
I
LNB
≤
750 mA
ENT = H, 12 mA
≤
I
LNB
≤
750mA
V
tone(PP)(EXTM)
f = 22 kHz square wave, I
LOAD
= 12 mA to
450 mA, V
IN
= 100mV to 125 mV;
V
PP
ac coupled
V
EXTM(PP)
AC coupled
20
400
40
5
400
22
650
—
10
550
24
900
60
15
800
kHz
mV
%
μs
mV
V
tone(PP)(ENT)
dc
tone
t
r
, t
f
External Modulation Input
Voltage Range
External Modulation Input
Impedance
100
—
125
mV
Z
EXTM
f = 22 kHz
4
—
10
k
continued next page
NOTES: 1. Typical data is for design information only.
2. Negative current is de
fi
ned as coming out of (sourcing) the speci
fi
ed device terminal.
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