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參數(shù)資料
| 型號(hào)： | 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)： | 8/14頁 |
| 文件大?。?/td> | 375K |
| 代理商： | 8281 |
8281
AND
8282
LNB SUPPLY AND
CONTROL-VOLTAGE REGULATORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
8
Small values of TCAP are used when the desired
transition time is less than a millisecond. In this case,
the minimum rise time is limited by the charge time
of the switching regulator output capacitor. This is
dependent on the LNB load current, peak current limit
in the buck switch, and the output amplitude change.
t
r
= C
BULK
(V
LNB(H)
– V
LNB(L)
)/I
(AV)
where I
(AV)
is the average current available to charge
the output capacitor and can be estimated by I
(AV)
=
1.4 – I
LNB
. Note that this is only a limitation due to
the ability to charge the output capacitor on a low-to-
high change of the LNB voltage. For high-to-low
transitions, the output voltage will be slew limited by
TCAP.
The minimum value for C
TCAP
is 4.7
-
nF.
Power dissipation.
The power dissipated, and
operating junction temperature of the device, can be
estimated to ensure that the device is operating within
the desired thermal budget.
The total device power dissipation (P
D
) is com-
prised of three components:
P
D
= P
D(bias)
+ P
D(lin)
+ P
D(buck)
where P
D(bias)
= V
IN
(I
IN
– 0.004),
P
D(lin)
=
V
BUCK
x I
LNB
,
P
D(buck)
= I
LNB2
x r
DS(on)
x V
BULK
/V
IN
where V
BULK
=
V
BUCK
+ (I
LNB
x R
S
) + V
LNB
.
The device junction temperature can then be
estimated as
T
J
= (P
D
x R
θ
JA
) + T
A
or
T
J
= (P
D
x R
θ
JT
) + T
T
APPLICATIONS INFORMATION (
cont’d
)
where T
T
is the power tab temperature (leads 4 or 13
for the A8281SLB or leads 6, 7, 18, or 19 for the
A8282SLB) and R
θ
JT
is 6
°
C/W.
Package thermal resistances, R
θ
JA
, measured on
JEDEC standard “high-K” four layer board:
A8281SLB..................................... 38
°
C/W
A8282SLB..................................... 35
°
C/W
measured on two-sided PWB with 3 square inches
(1935 mm
2
) copper ground area on each side:
A8281SLB..................................... 48
°
C/W
A8282SLB..................................... 45
°
C/W
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