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參數(shù)資料
| 型號： | LT3574EMS#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.1 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-16 |
| 文件頁數(shù)： | 2/24頁 |
| 文件大?。?/td> | 285K |
| 代理商： | LT3574EMS#PBF |
LT3574
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3574f
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 flyback converter has a complicated relationship be-
tween 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 flyback 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 fits this design
example perfectly and outputs close to 2.5W at 30V but
lowers to 2W at 20V.
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)
1.5
2.0
2.5
40
3574 F01
1.0
0.5
0
10
20
30
5
45
15
25
35
3.5
3.0
MAX POWER OUTPUT
1:1
2:1
3:1
4:1
5:1
7:1
10:1
INPUT VOLTAGE (V)
0
OUTPUT
POWER
(W)
1.5
2.0
2.5
40
3574 F02
1.0
0.5
0
10
20
30
5
45
15
25
35
3.5
3.0
MAX POWER OUTPUT
1:1
2:1
3:1
4:1
5:1
7:1
INPUT VOLTAGE (V)
0
OUTPUT
POWER
(W)
1.5
2.0
2.5
40
3574 F03
1.0
0.5
0
10
20
30
5
45
15
25
35
3.5
3.0
MAX POWER OUTPUT
1:1
2:1
3:1
applications inForMation
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| LT3574EMSTRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Isolated Flyback Converter Without an Opto-Coupler |
| LT3574IMS | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Isolated Flyback Converter Without an Opto-Coupler |
| LT3574IMS#PBF | 功能描述:IC REG FLYBK ISO ADJ .65A 16MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT3574IMS#TRPBF | 功能描述:IC REG FLYBK ISO ADJ .65A 16MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT3574IMSPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Isolated Flyback Converter Without an Opto-Coupler |
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