參數(shù)資料
型號: LTC3827IG-1#TR
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: 3 A DUAL SWITCHING CONTROLLER, 650 kHz SWITCHING FREQ-MAX, PDSO28
封裝: 5.30 MM, PLASTIC, SSOP-28
文件頁數(shù): 18/32頁
文件大?。?/td> 448K
代理商: LTC3827IG-1#TR
LTC3827-1
25
38271fe
APPLICATIONS INFORMATION
4. Are the SENSE and SENSE + leads routed together
with minimum PC trace spacing? The lter capacitor
between SENSE+ and SENSEshould be as close as
possible to the IC. Ensure accurate current sensing with
Kelvin connections at the SENSE resistor.
5. Is the INTVCC decoupling capacitor connected close to
the IC, between the INTVCC and the power ground pins?
This capacitor carries the MOSFET drivers current peaks.
An additional 1μF ceramic capacitor placed immediately
next to the INTVCC and PGND pins can help improve
noise performance substantially.
6. Keep the switching nodes (SW1, SW2), top gate nodes
(TG1, TG2), and boost nodes (BOOST1, BOOST2) away
from sensitive small-signal nodes, especially from
the opposites channel’s voltage and current sensing
feedback pins. All of these nodes have very large and
fast moving signals and therefore should be kept on
the “output side” of the LTC3827 and occupy minimum
PC trace area.
7. Use a modied “star ground” technique: a low imped-
ance, large copper area central grounding point on
the same side of the PC board as the input and output
capacitors with tie-ins for the bottom of the INTVCC
decoupling capacitor, the bottom of the voltage feedback
resistive divider and the SGND pin of the IC.
Figure 12. Branch Current Waveforms
RL1
D1
L1
SW1
RSENSE1
VOUT1
COUT1
VIN
CIN
RIN
RL2
D2
BOLD LINES INDICATE
HIGH SWITCHING
CURRENT. KEEP LINES
TO A MINIMUM LENGTH.
L2
SW2
38271 F12
RSENSE2
VOUT2
COUT2
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