參數(shù)資料
型號： LTC1267- ADJ5
廠商： Linear Technology Corporation
元件分類： 基準電壓源/電流源
英文描述： 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C
中文描述： 射頻放大器
文件頁數(shù)： 14/16頁
文件大?。?/td> 282K
代理商： LTC1267- ADJ5
14
LTC1267
LTC1267-ADJ/LTC1267-ADJ5
APPLICATIU
W
U
U
Figure 8. LTC1267 Layout Diagram
28
27
26
25
24
23
22
21
20
19
18
17
16
15
LTC1267
1
2
3
4
5
6
7
8
9
10
11
12
13
14
V
IN
CAP3
PGATE 3
PDRIVE 3
NGATE 3
PGND3
V
CC3
C
T3
I
THR3
SGND3
SHDN3
SENSE
–
3
SENSE
+
3
EXT V
CC
MSHDN
CAP5
PGATE 5
PDRIVE 5
NGATE 5
PGND5
V
CC5
SGND5
SHDN5
SENSE
+
5
SENSE
–
5
C
T5
I
THR5
V
CC
0.15
μ
F
C
IN3
C
IN5
C
OUT5
+
V
OUT5
V
IN
C
T3
+
+
0.15
μ
F
0.1
μ
F
MSHDN
SHDN5
1N4148
BOLD LINES INDICATE HIGH CURRENT PATHS
1N4148
P-CH
P-CH
3300pF
1k
N-CH
N-CH
D3
L3
0.1
μ
F
1
μ
F
1
μ
F
C
T5
1000pF
3300pF
1k
LTC1267 F08
R
SENSE3
R
SENSE5
V
OUT3
C
OUT3
D5
+
+
+
1000pF
L5
SHDN3
6. In adjustable versions, the feedback pin is very sensi-
tive to pickup from the switch node. Care must be taken
to isolate V
FB1, 2
from possible capacitive coupling of
the inductor switch signal.
7. Are MSHDN and SHDN1, 3, 5 actively pulled to ground
during normal operation These shutdown pins are
high impedance and must not be allowed to float.
Troubleshooting Hints
Since efficiency is critical to LTC1267 applications, it is
very important to verify that the circuit is functioning
correctly in both continuous and Burst Mode
operation.
The waveform to monitor is the voltage on the C
T
pin.
In continuous mode (I
LOAD
> I
BURST
) the voltage on the C
T
pin should be a sawtooth with a 0.9V
P-P
swing. This
voltage should never dip below 2V as shown in Figure 9a.
When load currents are low (I
LOAD
< I
BURST
) Burst Mode
operation occurs. The voltage on the C
T
pin now falls to
ground for periods of time as shown in Figure 9b.
If the C
T
is observed falling to ground at high output
currents, it indicates poor decoupling or improper ground-
ing. Refer to the Board Layout Checklist.
Inductor current should also be monitored. Look to verify
that the peak-to-peak ripple current in continuous mode
operation is approximately the same as in Burst Mode
operation.
3.3V
0V
(a) CONTINUOUS MODE OPERATION
3.3V
0V
(b) Burst Mode
OPERATION
LTC1267 F09
Figure 9. C
T
Waveforms
相關PDF資料
PDF描述
LTC1267-ADJ5 Circular Connector; No. of Contacts:37; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:15-35
LTC1267-ADJ XTAL MTL T/H HC49/US
LTC1267CG RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
LTC1267 RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
LTC1267CG-ADJ5 Circular Connector; No. of Contacts:37; Series:LJT06R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:15-35
相關代理商/技術參數(shù)
參數(shù)描述
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