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LTC3862 데이터시트(PDF) 21 Page - Linear Technology

부품명 LTC3862
상세설명  Multi-Phase Current Mode Step-Up DC/DC Controller
PDF  40 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LTC3862 데이터시트(HTML) 21 Page - Linear Technology

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LTC3862
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3862fb
OPERATION
Figure 13. Leading Edge Blanking Effects
on the Minimum On-Time
Figure 14. SW Node Waveforms with Different Duty Cycle Limits
SW NODE
20V/DIV
GATE
2V/DIV
200ns/DIV
MINIMUM ON-TIME AT LIGHT LOAD WITH BLANK = SGND
VIN = 30V
VOUT = 48V
MEASURED ON-TIME = 180ns
VIN = 30V
VOUT = 48V
MEASURED ON-TIME = 260ns
VIN = 30V
VOUT = 48V
MEASURED ON-TIME = 340ns
INDUCTOR
CURRENT
1A/DIV
SW NODE
20V/DIV
GATE
2V/DIV
INDUCTOR
CURRENT
1A/DIV
SW NODE
20V/DIV
GATE
2V/DIV
INDUCTOR
CURRENT
1A/DIV
200ns/DIV
MINIMUM ON-TIME AT LIGHT LOAD WITH BLANK = FLOAT
200ns/DIV
3862 F13
MINIMUM ON-TIME AT LIGHT LOAD WITH BLANK = 3V8
SW NODE
10V/DIV
SW NODE
10V/DIV
1μs/DIV
96% MAXIMUM DUTY CYCLE WITH DMAX = SGND
INDUCTOR
CURRENT
2A/DIV
1μs/DIV
84% MAXIMUM DUTY CYCLE WITH DMAX = FLOAT
INDUCTOR
CURRENT
2A/DIV
SW NODE
10V/DIV
INDUCTOR
CURRENT
2A/DIV
1μs/DIV
3862 F14
75% MAXIMUM DUTY CYCLE WITH DMAX = 3V8
In order to satisfy these different applications require-
ments, the LTC3862 has a simple way to program the
maximum duty cycle. Connecting the DMAX pin to SGND
limits the maximum duty cycle to 96%. Floating this pin
limits the duty cycle to 84% and connecting the DMAX pin
to the 3V8 supply limits it to 75%. Figure 14 illustrates
the effect of limiting the maximum duty cycle on the SW
node waveform of a boost converter.
The LTC3862 contains an oscillator that runs at a multiple
of the switching frequency, in order to provide for 2-, 3-,
4-, 6- and 12-phase operation. A digital counter is used
to divide down the fundamental oscillator frequency in
order to obtain the operating frequency of the gate drivers.
Since the maximum duty cycle limit is obtained from this
digital counter, the percentage maximum duty cycle does
not vary with process tolerances or temperature.



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