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LTC1159CS bảng dữ liệu(PDF) 15 Page - Linear Technology

tên linh kiện LTC1159CS
Giải thích chi tiết về linh kiện  High Efficiency Synchronous Step-Down Switching Regulators
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LTC1159CS bảng dữ liệu(HTML) 15 Page - Linear Technology

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LTC1159/LTC1159-3.3/LTC1159-5
Figure 10. High Efficiency 8V to 20V Input 2.5/5A Output Regulator
P-GATE
VIN
VCC
P-DRIVE
VCC
CT
ITH
SENSE–
CAP
SHDN2
EXTVCC
N-GATE
P-GND
S-GND
VFB
SENSE+
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LTC1159
0.15
µF
SHUTDOWN
0.1
µF
1N4148
1N4148
+
1000pF
2k
10k
10k
1%
0.047
µF
3.3
µF
1000pF
100pF
100
Ω
100
Ω
IRF7201
IRF7201
MBRS330
1
µF
WIMA
+
47
µF
25V
× 2
OS-CON
VIN
8V TO 20V
5V
L*
15
µH
RSENSE**
0.02
Ω
+ 330µF
6.3V
× 3
AVX
LTC1159 • F10
VOUT
2.5V/5A
*MAGNETICS 77120-A7 CORE, 16T 18GA. WIRE
**KRL SL-1-R020J
IRF7205
10k
1%
3.3V
0V
(a) CONTINUOUS MODE OPERATION
3.3V
0V
(b) Burst Mode OPERATION
LTC1159 • F09
Figure 9. CT Pin 6 Waveforms
Troubleshooting Hints
Since efficiency is critical to LTC1159 applications it is very
important to verify that the circuit is functioning correctly
in both continuous and Burst Mode operation. The wave-
form to monitor is the voltage on the CT pin .
In continuous mode (ILOAD > IBURST) the voltage should be
a sawtooth with a 0.9VP-P swing. This voltage should never
dip below 2V as shown in Figure 9a. When the load current
is low (ILOAD < IBURST), Burst Mode operation should occur
with the CT waveform periodically falling to ground as
shown in Figure 9b.
If the CT pin is observed falling to ground at high output
currents, it indicates poor decoupling or improper ground-
ing. Refer to the Board Layout Checklist.
TYPICAL APPLICATIO S
APPLICATIONS INFORMATION



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