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参数资料
| 型号： | LT3573EMSE#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.85 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | LEAD FREE, PLASTIC, MSOP-16 |
| 文件页数： | 2/26页 |
| 文件大小： | 1182K |
| 代理商： | LT3573EMSE#PBF |
LT3573
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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 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 six watts at 30V
but lowers to five watts 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)
6
7
35
5
4
10
20
5
15
25
30
40
1
0
3
8
2
3573 F01
N = 3:1
N = 7:1
N = 4:1
N = 10:1
MAXIMUM
OUTPUT
POWER
INPUT VOLTAGE (V)
0
OUTPUT
POWER
(W)
6
7
35
5
4
10
20
5
15
25
40
30
45
1
0
3
8
2
3573 F02
N = 7:1
N = 5:1
N = 2:1
N = 3:1
MAXIMUM
OUTPUT
POWER
INPUT VOLTAGE (V)
0
OUTPUT
POWER
(W)
6
7
35
5
4
10
20
5
15
25
40
30
45
1
0
3
8
2
3573 F03
N = 3:1
N = 2:1
N = 1:1
MAXIMUM
OUTPUT
POWER
相关PDF资料 |
PDF描述 |
|---|---|
| LT3573IMSE#TRPBF | 1.85 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT3581EDE#PBF | SWITCHING REGULATOR, PDSO14 |
| LT3581EDE#TRPBF | SWITCHING REGULATOR, PDSO14 |
| LT3581EMSE#PBF | SWITCHING REGULATOR, PDSO16 |
| LT3581EMSE#TRPBF | SWITCHING REGULATOR, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3573EMSETRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Isolated Flyback Converter without an Opto-Coupler |
| LT3573EMSE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Isolated Flyback Converter Without an Opto-Coupler |
| LT3573IMSE#PBF | 功能描述:IC REG FLYBACK ISO ADJ 16MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3573IMSE#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER FLYBACK 1MHZ MSOP-16 制造商:Linear Technology 功能描述:DC-DC CONVERTER, FLYBACK, 1MHZ, MSOP-16 |
| LT3573IMSE#TRPBF | 功能描述:IC REG FLYBACK ISO ADJ 16MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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