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參數(shù)資料
| 型號： | LTC2900-1CMS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Programmable Quad Supply Monitor with Adjustable Reset Timer |
| 中文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 199K |
| 代理商： | LTC2900-1CMS |
10
LTC2900
2900f
APPLICATIOU
W
U
U
Figure 6. Setting the Negative Adjustable Trip Point
–
+
2900 F06
V4
V
REF
9
8
V
TRIP
R4
1%
R3
1%
LTC2900
sensed and ground, is connected to the high impedance
noninverting inputs (V3, V4). The trip voltage is calculated
from:
R
R
4
V
V
TRIP
=
+
0 5
.
1
3
In the negative adjustable mode, the noninverting input on
the V4 comparator is connected to ground (Figure 6). The
tap point on an external resistive divider, connected be-
tween the negative voltage being sensed and the V
REF
pin,
is connected to the high impedance inverting input (V4).
V
REF
provides the necessary level shift required to operate
at ground. The trip voltage is calculated from:
R
R
4
V
V
V
VNo
al
TRIP
REF
REF
=
=
–
;
.
min
3
1 210
In a negative adjustable application, the minimum value
for R4 is limited by the sourcing capability of V
REF
(
±
1mA).
With no other load on V
REF
, R4 (minimum) is:
1.21V
÷
1mA = 1.21k
.
Tables 2 and 3 offer suggested 1% resistor values for
various adjustable applications.
Table 2. Suggested 1% Resistor Values for the ADJ Inputs
V
SUPPLY
(V)
V
TRIP
(V)
12
11.25
10
9.4
8
7.5
7.5
7
6
5.6
5
4.725
3.3
3.055
3
2.82
2.5
2.325
1.8
1.685
1.5
1.410
1.2
1.120
1
0.933
0.9
0.840
R3 (k
)
2150
1780
1400
1300
1020
845
511
464
365
237
182
124
86.6
68.1
R4 (k
)
100
100
100
100
100
100
100
100
100
100
100
100
100
100
Table 3. Suggested 1% Resistor Values for the –ADJ Input
V
SUPPLY
(V)
V
TRIP
(V)
–2
–1.87
–5
–4.64
–5.2
–4.87
–10
–9.31
–12
–11.30
R3 (k
)
187
464
487
931
1130
R4 (k
)
121
121
121
121
121
Figure 5. Setting the Positive Adjustable Trip Point
–
+
+
0.5V
2900 F05
V3 OR V4
V
TRIP
R3
1%
R4
1%
LTC2900
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| LTC29001IDD | 制造商:LTC 功能描述: |
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