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参数资料
| 型号： | LTC1266IS#TR-3.3 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 0.150 INCH, PLASTIC, SO-16 |
| 文件页数： | 8/20页 |
| 文件大小： | 245K |
| 代理商： | LTC1266IS#TR-3.3 |
16
LTC1266
LTC1266-3.3/LTC1266-5
Troubleshooting Hints
Since efficiency is critical to LTC1266 series 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 timing
capacitor, Pin 6.
In continuous mode (ILOAD > IBURST) the voltage on the CT
pin should be a sawtooth with a 0.9VP-P swing. This
voltage should never dip below 2V as shown in Figure 9a.
When load currents are low (ILOAD < IBURST) Burst Mode
operation should occur with the CT pin waveform periodi-
cally falling to ground for periods of time as shown in
Figure 9b.
If Pin 6 is observed falling to ground at high output
currents, it indicates poor decoupling or improper ground-
ing. Refer to the 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
LTC1266 series. These items are also illustrated graphi-
cally in the layout diagram of Figure 10. Check the follow-
ing in your layout:
1. Are the signal and power grounds segregated? The
LTC1266 signal ground (Pin 12) must return to the (–)
plate of COUT. The power ground returns to the source
of the bottom-side MOSFET, anode of the Schottky
diode and (–) plate of CIN, which should have as short
lead lengths as possible.
2. Does the LTC1266 SENSE – (Pin 8) connect to a point
close to RSENSE and the (+) plate of COUT? In adjustable
applications, the resistive divider R1 and R2 must be
connected between the (+) plate of COUT and signal
ground.
Figure 9. CT Waveforms
Figure 10. LTC1266 Layout Diagram (See Layout Checklist)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LTC1266
L
SHUTDOWN
BOLD LINES INDICATE
HIGH CURRENT PATHS
OUTPUT DIVIDER REQUIRED WITH
ADJUSTABLE VERSION ONLY
CIN
CB
COUT
PGND
TDRIVE
PINV
BINH
VIN
CT
ITH
SENSE–
BDRIVE
LBOUT
LBIN
SGND
SHDN
VFB
SENSE+
470
R1
R2
RSENSE
VOUT
1266 F10
VIN
1000pF
3300pF
CT
PWR VIN
+
–
3.3V
0V
3.3V
0V
1266 F09
(a) Continuous Mode Operation
(b) Burst Mode Operation
APPLICATIO S I FOR ATIO
WU
UU
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