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參數資料
| 型號： | LT3502AIDC |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.1 A SWITCHING REGULATOR, 2800 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 2 X 2 MM, PLASTIC, DFN-10 |
| 文件頁數： | 20/20頁 |
| 文件大?。?/td> | 457K |
| 代理商： | LT3502AIDC |
LT3502/LT3502A
9
3502f
APPLICATIONS INFORMATION
Table 1
VENDOR
URL
PART SERIES
INDUCTANCE RATE (μH)
SIZE (mm)
Sumida
www.sumida.com
CDRH4D28
CDRH5D28
CDRH8D28
1.2 to 4.7
2.5 to 10
2.5 to 33
4.5
× 4.5
5.5
× 5.5
8.3
× 8.3
Toko
www.toko.com
A916CY
D585LC
2 to 12
1.1 to 39
6.3
× 6.2
8.1
× 8
Würth Elektronik
www.we-online.com
WE-TPC(M)
WE-PD2(M)
WE-PD(S)
1 to 10
2.2 to 22
1 to 27
4.8
× 4.8
5.2
× 5.8
7.3
× 7.3
Inductor Selection and Maximum Output Current
A good rst choice for the inductor value is:
L = 1.6(VOUT + VD) for the LT3502A
L = 4.6(VOUT + VD) for the LT3502
where VD is the voltage drop of the catch diode (~0.4V)
and L is in μH. With this value there will be no subhar-
monic oscillation for applications with 50% or greater duty
cycle. The inductor’s RMS current rating must be greater
than the maximum load current and its saturation current
should be about 30% higher. For robust operation during
fault conditions, the saturation current should be above
1.2A. To keep efciency high, the series resistance (DCR)
should be less than 0.1
Ω. Table 1 lists several vendors
and types that are suitable.
Figure 2. Pulse Skip Occurs when
Required On Time is Below 60ns
Figure 3. Pulse Skip with Large Load Current Will be Limited
by the DA Valley Current Limit. Notice the Flat Inductor Valley
Current and Reduced Switching Frequency
the output voltage ripple increases. For operation above
VIN(MAX) the only component requirement is that the
components be adequately rated for operation at the
intended voltage levels.
Inductor current may reach current limit when operating
in pulse skip mode with small valued inductors. In this
case, the LT3502/LT3502A will periodically reduce its
frequency to keep the inductor valley current to 650mA
(Figure 3). Peak inductor current is therefore peak current
plus minimum switch delay:
900
60
mA
VV
L
ns
IN
OUT
+
–
The part is robust enough to survive prolonged operation
under these conditions as long as the peak inductor cur-
rent does not exceed 1.2A. Inductor current saturation
and junction temperature may further limit performance
during this operating regime.
VSW
20V/DIV
VOUT
100mV/DIV
1
μs/DIV
VIN = 40V
VOUT = 3.3V
L = 6.8
μH
COUT = 10μF
IOUT = 250mA
3502 F02
IL
500mA/DIV
VSW
20V/DIV
VOUT
100mV/DIV
1
μs/DIV
VIN = 40V
VOUT = 3.3V
L = 6.8
μH
COUT = 10μF
IOUT = 500mA
3502 F03
IL
500mA/DIV
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