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參數(shù)資料
| 型號： | LLTC1142HV |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 15/20頁 |
| 文件大?。?/td> | 261K |
| 代理商： | LLTC1142HV |
15
LTC1142/LTC1142L/LTC1142HV
To prevent stray pickup a 100pF capacitor is suggested
across R1 located close to the LTC1142HV-ADJ/LTC1142L-
ADJ as in Figure 6. The external divider network must be
placed across C
OUT
with the negative plate of C
OUT
returned
to signal ground. Refer to the Board Layout Checklist.
the layout diagram of Figure 7. In general each block
should be self-contained with little cross coupling for best
performance. Check the following in your layout:
1. Are the signal and power grounds segregated The
LTC1142 signal ground [Pin 3 (17) or the LTC1142, Pin
4 (18) for LTC1142-ADJ] must return to the (–) plate
of
C
OUT
. The power ground returns to the source of the
N-channel MOSFET, anode of the Schottky diode,
and (–) plate of C
IN
, which should have as short lead
lengths as possible.
2. Does the LTC1142 Sense
–
, Pin 28 (14) connect to a
point close to R
SENSE
and the (+) plate of C
OUT
3. Are the Sense
–
and Sense
+
leads routed together with
minimum PC trace spacing The 1000pF capacitor
between Pins 1 (15) and 28 (14) should be as close as
possible to the LTC1142. Ensure accurate current sens-
APPLICATIU
W
U
U
Figure 6. LTC1142-ADJ External Feedback Network
Figure 7. LTC1142 Layout Diagram (see Board Layout Checklist)
Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC1142. These items are also illustrated graphically in
R
SENSE
100pF
R2
R1
+
C
OUT
V
OUT
V
FB
[PIN 2(16)]
SGND
[PIN 4(18)]
1142 F06
+
1000pF
28
27
26
25
24
23
22
21
20
19
18
17
16
15
SENSE
–
3
I
TH3
INTV
CC3
C
T3
V
IN3
NDRIVE 5
PGND5
SGND5
SHDN5
SENSE
+
5
LTC1142
1
2
3
4
5
6
7
8
9
10
11
12
13
14
+
+
PDRIVE 3
NC
NC
PDRIVE 5
NC
NC
NC
V
IN3
NC
V
IN5
1000pF
3300pF
3300pF
1k
1k
C
T5
+
C
OUT3
R
SENSE3
+
–
V
OUT3
–
+
V
IN3
C
IN3
L1
N-CH
P-CH
1
μ
F
1
μ
F
P-CH
N-CH
C
IN5
D1
D2
L2
+
C
OUT5
+
–
–
+
V
IN5
R
SENSE5
V
OUT5
1142 F07
SHDN (5V OUTPUT)
SGND3
SHDN (3.3V OUTPUT)
BOLD LINES INDICATE HIGH CURRENT PATHS
SENSE
+
3
SHDN3
PGND3
NDRIVE 3
V
IN5
C
T5
INTV
CC5
I
TH5
SENSE
–
5
C
T3
+
SENSE RESISTOR PCB PATTERN
SENSE
+
SENSE
–
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