參數(shù)資料
型號(hào)： LT3575IFE#PBF
廠(chǎng)商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 4.2 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 4.40 MM, LEAD FREE, PLASTIC, TSSOP-16
文件頁(yè)數(shù)： 2/24頁(yè)
文件大?。?/td> 240K
代理商： LT3575IFE#PBF
LT3575
10
3575f
APPLICATIONS INFORMATION
Table 2. Common Resistor Values for 2:1 Transformers
VOUT (V)
NPS
RFB (kΩ)
RREF (kΩ)
RTC (kΩ)
3.3
2.00
37.4
6.04
18.7
5
2.00
56
6.04
28
12
2.00
130
6.04
66.5
15
2.00
162
6.04
80.6
Table 3. Common Resistor Values for 3:1 Transformers
VOUT (V)
NPS
RFB (kΩ)
RREF (kΩ)
RTC (kΩ)
3.3
3.00
56.2
6.04
20
5
3.00
80.6
6.04
28.7
10
3.00
165
6.04
54.9
Table 4. Common Resistor Values for 4:1 Transformers
VOUT (V)
NPS
RFB (kΩ)
RREF (kΩ)
RTC (kΩ)
3.3
4.00
76.8
6.04
19.1
5
4.00
113
6.04
28
Output Power
A yback converter has a complicated relationship between
the input and output current compared to a buck or a
boost. A boost has a relatively constant maximum input
current regardless of input voltage and a buck has a
relatively constant maximum output current regardless of
input voltage. This is due to the continuous nonswitching
behavior of the two currents. A yback converter has both
discontinuous input and output currents which makes it
similar to a nonisolated buck-boost. The duty cycle will
affect the input and output currents, making it hard to
predict output power. In addition, the winding ratio can
be changed to multiply the output current at the expense
of a higher switch voltage.
The graphs in Figures 1-3 show the maximum output
power possible for the output voltages 3.3V, 5V, and 12V.
The maximum power output curve is the calculated output
power if the switch voltage is 50V during the off-time. To
achieve this power level at a given input, a winding ratio
value must be calculated to stress the switch to 50V,
resulting in some odd ratio values. The curves below are
examples of common winding ratio values and the amount
of output power at given input voltages.
One design example would be a 5V output converter with
a minimum input voltage of 20V and a maximum input
voltage of 30V. A three-to-one winding ratio ts this design
example perfectly and outputs close to ten watts at 30V
but lowers to eight watts at 20V.
TRANSFORMER DESIGN CONSIDERATIONS
Transformer specication and design is perhaps the most
critical part of successfully applying the LT3575. In addition
to the usual list of caveats dealing with high frequency
isolated power supply transformer design, the following
information should be carefully considered.
LinearTechnologyhasworkedwithseveralleadingmagnetic
component manufacturers to produce pre-designed yback
transformers for use with the LT3575. Table 5 shows the
details of several of these transformers.
Figure 1. Output Power for 3.3V Output
Figure 2. Output Power for 5V Output
Figure 3. Output Power for 12V Output
INPUT VOLTAGE (V)
0
OUTPUT
POWER
(W)
10
12
35
8
6
10
20
5
15
25
40
30
45
0
4
14
2
3573 F02
5:1
4:1
MAXIMUM
OUTPUT
POWER
7:1
1:1
2:1
3:1
MAX POUT
INPUT VOLTAGE (V)
0
OUTPUT
POWER
(W)
10
12
35
8
6
10
20
5
15
25
30
40
0
4
14
2
3573 F03
MAXIMUM
OUTPUT
POWER
1:1
2:1
3:1
MAX POUT
7:1
5:1
INPUT VOLTAGE (V)
0
OUTPUT
POWER
(W)
10
12
40
8
6
10
20
5
15
25
35
30
45
2
0
4
14
3575 F01
MAXIMUM
OUTPUT
POWER
10:1
1:1
2:1
3:1
4:1
MAX POUT
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參數(shù)描述
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