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參數(shù)資料
| 型號： | LT3511MPMS#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.43 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO12 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-12/16 |
| 文件頁數(shù)： | 26/26頁 |
| 文件大?。?/td> | 298K |
| 代理商： | LT3511MPMS#PBF |
LT3511
9
3511fb
applicaTions inForMaTion
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.
ThegraphsinFigures1-4showthetypicalmaximumoutput
power possible for the output voltages 3.3V, 5V, 12V and
24V. The maximum power output curve is the calculated
output power if the switch voltage is 100V during the off-
time. 50V of margin is left for leakage voltage spike. To
achieve this power level at a given input, a winding ratio
value must be calculated to stress the switch to 100V,
resulting in some odd ratio values. The following curves
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 36V and a maximum input
voltage of 72V. A four-to-one winding ratio fits this design
example perfectly and outputs close to 1.6W at 72V but
lowers to 1W at 36V.
The equations below calculate output power:
Power = η VIN D IPEAK 0.5
Efficiency = η = ~85%
Duty Cycle = D =
VOUT + VF
(
) NPS
VOUT + VF
(
) NPS + VIN
Peak switch current = IPEAK = 0.26A
INPUT VOLTAGE (V)
0
OUTPUT
POWER
(W)
0.5
1.0
1.5
2.0
2.5
3.0
N=15
20
40
60
80
3511 F01
100
N=12
N=10
N=8
N=6
N=4
N=2
N = NPS(MAX)
INPUT VOLTAGE (V)
0
OUTPUT
POWER
(W)
0.5
1.0
1.5
2.0
2.5
3.0
20
40
60
80
3511 F02
100
N=4
N=5
N=6
N=7
N=8
N=3
N=2
N=1
N = NPS(MAX)
INPUT VOLTAGE (V)
0
OUTPUT
POWER
(W)
0.5
1.0
1.5
2.0
2.5
3.0
20
40
60
80
3511 F04
100
N=2
N=1
N = NPS(MAX)
Figure 1. Output Power for 3.3V Output
Figure 2. Output Power for 5V Output
Figure 3. Output Power for 12V Output
Figure 4. Output Power for 24V Output
INPUT VOLTAGE (V)
0
OUTPUT
POWER
(W)
0.5
1.0
1.5
2.0
2.5
3.5
3.0
20
40
60
80
3511 F03
100
N=4
N=5
N=3
N=2
N=1
N = NPS(MAX)
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| LT3512EMS#PBF | 功能描述:IC REG FLYBK ISO ADJ .42A 16MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:250 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 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關:2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應商設備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
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