參數(shù)資料
型號(hào): LTC3862IFE#PBF
廠(chǎng)商: LINEAR TECHNOLOGY CORP
元件分類(lèi): 穩(wěn)壓器
英文描述: DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24
封裝: 4.40 MM, LEAD FREE, PLASTIC, TSSOP-24
文件頁(yè)數(shù): 14/40頁(yè)
文件大?。?/td> 613K
代理商: LTC3862IFE#PBF
LTC3862
21
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.
相關(guān)PDF資料
PDF描述
LTC3862HFE#PBF DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24
LTC3862EGN#TRPBF DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24
LTC3862IUH#PBF DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC24
LTC3862EGN#PBF DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24
LTC3862EUH#TRPBF DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC24
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