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参数资料
| 型号： | LTC2900-1CMS#TRPFB |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封装： | PLASTIC, MSOP-10 |
| 文件页数： | 2/16页 |
| 文件大小： | 200K |
| 代理商： | LTC2900-1CMS#TRPFB |
10
LTC2900
2900f
APPLICATIO S I FOR ATIO
WU
UU
Figure 6. Setting the Negative Adjustable Trip Point
–
+
2900 F06
V4
VREF
9
8
VTRIP
R4
1%
R3
1%
LTC2900
sensed and ground, is connected to the high impedance
noninverting inputs (V3, V4). The trip voltage is calculated
from:
VV
R
TRIP =+
05
1
3
4
.
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 VREF pin,
is connected to the high impedance inverting input (V4).
VREF provides the necessary level shift required to operate
at ground. The trip voltage is calculated from:
VV
R
V
V No
al
TRIP
REF
=
=
–
;
.
min
3
4
1 210
In a negative adjustable application, the minimum value
for R4 is limited by the sourcing capability of VREF (±1mA).
With no other load on VREF, 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
VSUPPLY (V)
VTRIP (V)
R3 (k
)
R4 (k
)
12
11.25
2150
100
10
9.4
1780
100
8
7.5
1400
100
7.5
7
1300
100
6
5.6
1020
100
5
4.725
845
100
3.3
3.055
511
100
3
2.82
464
100
2.5
2.325
365
100
1.8
1.685
237
100
1.5
1.410
182
100
1.2
1.120
124
100
1
0.933
86.6
100
0.9
0.840
68.1
100
Table 3. Suggested 1% Resistor Values for the –ADJ Input
VSUPPLY (V)
VTRIP (V)
R3 (k
)
R4 (k
)
–2
–1.87
187
121
–5
–4.64
464
121
–5.2
–4.87
487
121
–10
–9.31
931
121
–12
–11.30
1130
121
Figure 5. Setting the Positive Adjustable Trip Point
–
+
– 0.5V
2900 F05
V3 OR V4
VTRIP
R3
1%
R4
1%
LTC2900
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