參數(shù)資料
型號(hào)： LT3493EDCB#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 2.2 A SWITCHING REGULATOR, 815 kHz SWITCHING FREQ-MAX, PDSO6
封裝： 2 X 3 MM, LEAD FREE, PLASTIC, MO-229, DFN-6
文件頁(yè)數(shù)： 8/20頁(yè)
文件大?。?/td> 588K
代理商： LT3493EDCB#PBF
LT3493
16
3493fb
model works well as long as the value of the inductor is
not too high and the loop crossover frequency is much
lower than the switching frequency. With a larger ceramic
capacitor (very low ESR), crossover may be lower and a
phase lead capacitor (CPL) across the feedback divider may
improve the phase margin and transient response. Large
electrolytic capacitors may have an ESR large enough to
create an additional zero, and the phase lead may not be
necessary.
If the output capacitor is different than the recommended
capacitor, stability should be checked across all operating
conditions, including load current, input voltage and tem-
perature. The LT1375 data sheet contains a more thorough
discussion of loop compensation and describes how to
test the stability using a transient load.
PCB Layout
For proper operation and minimum EMI, care must be taken
during printed circuit board layout. Figure 11 shows the
recommended component placement with trace, ground
plane and via locations. Note that large, switched currents
ow in the LT3493’s VIN and SW pins, the catch diode (D1)
and the input capacitor (C2). The loop formed by these
components should be as small as possible and tied to
system ground in only one place. These components, along
with the inductor and output capacitor, should be placed on
the same side of the circuit board, and their connections
should be made on that layer. Place a local, unbroken ground
plane below these components, and tie this ground plane
to system ground at one location, ideally at the ground
terminal of the output capacitor C1. The SW and BOOST
nodes should be as small as possible. Finally, keep the
FB node small so that the ground pin and ground traces
will shield it from the SW and BOOST nodes. Include vias
near the exposed GND pad of the LT3493 to help remove
heat from the LT3493 to the ground plane.
APPLICATIONS INFORMATION
–
+
–
+
780mV
SW
VC
LT3493
GND
3493 F10
R1
OUT
ESR
ERROR
AMPLIFIER
CURRENT MODE
POWER STAGE
FB
R2
1M
RC
60k
CC
100pF
C1
gm =
300μA/V
gm =
1.6A/V
+
CPL
0.7V
Figure 10. Model for Loop Response
Figure 11. A Good PCB Layout Ensures Proper, Low EMI Operation
C2
D1
C1
SYSTEM
GROUND
: VIAS TO LOCAL GROUND PLANE
: OUTLINE OF LOCAL GROUND PLANE
VOUT
3493 F11
VIN
SHDN
相關(guān)PDF資料
PDF描述
LT3493IDCB#PBF 2.2 A SWITCHING REGULATOR, 815 kHz SWITCHING FREQ-MAX, PDSO6
LT3493EDCB#TRM 2.2 A SWITCHING REGULATOR, 815 kHz SWITCHING FREQ-MAX, PDSO6
LT3493EDCB#TR 2.2 A SWITCHING REGULATOR, 815 kHz SWITCHING FREQ-MAX, PDSO6
LT3513EUHF#TRPBF 3.5 A SWITCHING REGULATOR, 2220 kHz SWITCHING FREQ-MAX, PQCC38
LT3513EUHF#PBF 3.5 A SWITCHING REGULATOR, 2220 kHz SWITCHING FREQ-MAX, PQCC38
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT3493EDCB-TR 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:1.2A, 750kHz Step-Down Switching Regulator in 2mm × 3mm DFN
LT3493EDCBTRMPBF 制造商:Linear Technology 功能描述:Sw. Regulator 1.2A 750kHz Step-Down DFN6
LT3493EDCB-TRPBF 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:1.2A, 750kHz Step-Down Switching Regulator in 2mm × 3mm DFN
LT3493IDCB 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:1.2A, 750kHz Step-Down Switching Regulator in 2mm × 3mm DFN
LT3493IDCB#PBF 制造商:Linear Technology 功能描述:BUCK SW REG 1.4A 750KHZ 6D 制造商:Linear Technology 功能描述:DC-DC CONVERTER BUCK 750KHZ 制造商:Linear Technology 功能描述:BUCK, SW REG, 1.4A, 750KHZ, 6DFN 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 750KHZ, 1.2A, DFN-6; Primary Input Voltage:36V; No. of Outputs:1; Output Voltage:780mV; Output Current:1.2A; No. of Pins:6; Operating Temperature Min:-40C; Operating Temperature Max:125C; Package / Case:6-DFN;RoHS Compliant: Yes
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