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參數(shù)資料
| 型號： | LT3575EFE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 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 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大小： | 240K |
| 代理商： | LT3575EFE#PBF |
LT3575
14
3575f
Secondary Leakage Inductance
In addition to the previously described effects of leakage
inductance in general, leakage inductance on the secondary
in particular exhibits an additional phenomenon. It forms
an inductive divider on the transformer secondary that
effectively reduces the size of the primary-referred
yback pulse used for feedback. This will increase the
output voltage target by a similar percentage. Note that
unlike leakage spike behavior, this phenomenon is load
independent. To the extent that the secondary leakage
inductance is a constant percentage of mutual inductance
(over manufacturing variations), this can be accommodated
by adjusting the RFB/RREF resistor ratio.
Winding Resistance Effects
Resistance in either the primary or secondary will reduce
overall efficiency (POUT/PIN). Good output voltage
regulation will be maintained independent of winding
resistance due to the boundary mode operation of the
LT3575.
Bilar Winding
A bilar, or similar winding technique, is a good way to
minimize troublesome leakage inductances. However,
remember that this will also increase primary-to-secondary
capacitance and limit the primary-to-secondary breakdown
voltage, so, bilar winding is not always practical. The
Linear Technology applications group is available and
extremely qualied to assist in the selection and/or design
of the transformer.
Setting the Current Limit Resistor
The maximum current limit can be set by placing a resistor
between the RILIM pin and ground. This provides some
exibility in picking standard off-the-shelf transformers that
may be rated for less current than the LT3575’s internal
power switch current limit. If the maximum current limit
is needed, use a 10k resistor. For lower current limits, the
following equation sets the approximate current limit:
RA I
k
ILIM
LIM
=
+
65 10 3 5
10
3
( .
)
The Switch Current Limit vs RILIM plot in the Typical
Performance Characteristics section depicts a more
accurate current limit.
Undervoltage Lockout (UVLO)
The SHDN/UVLO pin is connected to a resistive voltage
divider connected to VIN as shown in Figure 8. The voltage
threshold on the SHDN/UVLO pin for VIN rising is 1.22V.
To introduce hysteresis, the LT3575 draws 2.8μA from the
SHDN/UVLOpinwhenthepinisbelow1.22V.Thehysteresis
is therefore user-adjustable and depends on the value of
R1. The UVLO threshold for VIN rising is:
V
VR
R
A R
IN UVLO RISING
(,
)
. (
)
.
=
+
122
1
2
28
1
The UVLO threshold for VIN falling is:
V
VR
R
IN UVLO FALLING
(,
)
. (
)
=
+
122
1
2
To implement external run/stop control, connect a small
NMOS to the UVLO pin, as shown in Figure 8. Turning the
NMOS on grounds the UVLO pin and prevents the LT3575
from operating, and the part will draw less than a 1μA of
quiescent current.
Figure 8. Undervoltage Lockout (UVLO)
LT3575
SHDN/UVLO
GND
R2
R1
VIN
3575 F08
RUN/STOP
CONTROL
(OPTIONAL)
APPLICATIONS INFORMATION
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| LT3641EFE#TRPBF | 3.4 A DUAL SWITCHING CONTROLLER, 2350 kHz SWITCHING FREQ-MAX, PDSO28 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LT3575IFE#PBF | 功能描述:IC REG FLYBACK ISO ADJ 16TSSOP 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(guān):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(yīng)商設(shè)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 |
| LT3575IFE#TRPBF | 功能描述:IC REG FLYBACK ISO ADJ 16TSSOP 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:- 設(shè)計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 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:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT3579 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:6A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3579-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:6A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3579EFE#PBF | 功能描述:IC REG MULTI CONFIG SYNC 20TSSOP 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(guān):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(yīng)商設(shè)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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