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参数资料
| 型号： | LT3493EDCB-3#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.2 A SWITCHING REGULATOR, 815 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 2 X 3 MM, PLASTIC, MO-229, DFN-6 |
| 文件页数： | 7/20页 |
| 文件大小： | 401K |
| 代理商： | LT3493EDCB-3#TR |
15
LT3493-3
3493-3f
APPLICATIO S I FOR ATIO
WU
U
Figure 8. A Well Chosen Input Network Prevents Input Voltage Overshoot and
Ensures Reliable Operation When the LT3493-3 is Connected to a Live Supply
Frequency Compensation
The LT3493-3 uses current mode control to regulate the
output. This simplifies loop compensation. In particular,
the LT3493-3 does not require the ESR of the output
capacitor for stability allowing the use of ceramic capaci-
tors to achieve low output ripple and small circuit size.
Figure 9 shows an equivalent circuit for the LT3493-3
control loop. The error amp is a transconductance ampli-
fier with finite output impedance. The power section,
consisting of the modulator, power switch and inductor, is
modeled as a transconductance amplifier generating an
output current proportional to the voltage at the VC node.
Note that the output capacitor integrates this current, and
that the capacitor on the VC node (CC) integrates the error
amplifier output current, resulting in two poles in the loop.
RC provides a zero. With the recommended output capaci-
tor, the loop crossover occurs above the RCCC zero. This
simple model works well as long as the value of the
+
LT3493-3
2.2
F
VIN
20V/DIV
IIN
5A/DIV
20
s/DIV
VIN
CLOSING SWITCH
SIMULATES HOT PLUG
IIN
(8a)
(8b)
(8c)
LOW
IMPEDANCE
ENERGIZED
24V SUPPLY
STRAY
INDUCTANCE
DUE TO 6 FEET
(2 METERS) OF
TWISTED PAIR
+
LT3493-3
2.2
F
10
F
35V
AI.EI.
LT3493-3
2.2
F
0.1
F
1
3493-3 F09
VIN
20V/DIV
IIN
5A/DIV
20
s/DIV
VIN
20V/DIV
IIN
5A/DIV
20
s/DIV
DANGER!
RINGING VIN MAY EXCEED
ABSOLUTE MAXIMUM
RATING OF THE LT3493-3
–
+
–
+
780mV
SW
VC
LT3493-3
GND
3493-3 F10
R1
OUT
ESR
ERROR
AMPLIFIER
CURRENT MODE
POWER STAGE
FB
R2
1M
RC
60k
CC
100pF
C1
gm =
300
A/V
gm =
1.6A/V
+
CPL
0.7V
Figure 9. Model for Loop Response
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
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| LT3494EDDB | 0.25 A SWITCHING REGULATOR, PDSO8 |
| LT3502AEDC#PBF | 1.1 A SWITCHING REGULATOR, 2800 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT3502AIDC#PBF | 1.1 A SWITCHING REGULATOR, 2800 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT3502AIDC#TR | 1.1 A SWITCHING REGULATOR, 2800 kHz SWITCHING FREQ-MAX, PDSO10 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3493EDCBPBF | 制造商:LT 功能描述:Pb Free |
| LT3493EDCB-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.2A, 750kHz Step-Down Switching Regulator in 2mm × 3mm DFN |
| LT3493EDCB-TR | 制造商:LINER 制造商全称: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 制造商全称:Linear Technology 功能描述:1.2A, 750kHz Step-Down Switching Regulator in 2mm × 3mm DFN |
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