參數(shù)資料
型號: LTC1709EG
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: CHOKE COIL 6.8UH 620MA SMD
中文描述: 3 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO36
封裝: 0.209 INCH, PLASTIC, SSOP-36
文件頁數(shù): 26/28頁
文件大?。?/td> 319K
代理商: LTC1709EG
26
LTC1709-7
APPLICATIU
W
U
U
how to calculate RMS current for the single stage switch-
ing regulator. Figures 3 and 4 illustrate how the input and
output currents are reduced by using an additional phase.
The input current peaks drop in half and the frequency is
doubled for this 2-phase converter. The input capacity
requirement is thus reduced theoretically by a factor of
four! Ceramic input capacitors with their unbeatably low
ESR characteristics can be used.
Figure 4 illustrates the RMS input current drawn from the
input capacitance vs the duty cycle as determined by the
ratio of input and output voltage. The peak input RMS
current level of the single phase system is reduced by 50%
in a 2-phase solution due to the current splitting between
the two stages.
Figure 10. Instantaneous Current Path Flow in a Multiple Phase Switching Regulator
Figure 11. Single and 2-Phase Current Waveforms
R
L
V
OUT
C
OUT
+
D1
L1
SW1
R
SENSE1
V
IN
C
IN
R
IN
+
D2
BOLD LINES INDICATE
HIGH, SWITCHING
CURRENT LINES.
KEEP LINES TO A
MINIMUM LENGTH.
L2
SW2
17097 F10
R
SENSE2
I
CIN
SW V
I
COUT
I
CIN
SW1 V
DUAL PHASE
SINGLE PHASE
SW2 V
I
COUT
RIPPLE
17097 F11
I
L1
I
L2
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LTC1709EG7 制造商:Linear Technology 功能描述:
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