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參數(shù)資料
| 型號： | LT3573IMSE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.85 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-16 |
| 文件頁數(shù)： | 7/26頁 |
| 文件大?。?/td> | 1182K |
| 代理商： | LT3573IMSE#PBF |
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LT3573
3573fc
applications inForMation
values). If too large of an RC value is used, the part will be
more susceptible to high frequency noise and jitter. If too
small of an RCvalueisused,thetransientperformancewill
suffer. The value choice for CC is somewhat the inverse
of the RC choice: if too small a CC value is used, the loop
may be unstable, and if too large a CC value is used, the
transient performance will also suffer. Transient response
plays an important role for any DC/DC converter.
Design Example
The following example illustrates the converter design
process using LT3573.
Given the input voltage of 20V to 28V, the required output
is 5V, 1A.
VIN(MIN) = 20V, VIN(MAX) = 28V, VOUT = 5V, VF = 0.5V
and IOUT = 1A
1. Select the transformer turns ratio to accommodate
the output.
The output voltage is reflected to the primary side by a
factor of turns ratio N. The switch voltage stress VSW is
expressed as:
N
V
N V
V
P
S
SW MAX
IN
OUT
F
=
+
<
(
)
(
) 50
Or rearranged to:
N
V
IN MAX
OUT
F
<
+
50
(
)
(
)
Ontheotherhand,theprimary-sidecurrentismultipliedby
the same factor of N. The converter output capability is:
I
D
NI
D
N V
V
N
OUT MAX
PK
OUT
F
IN
(
)
. (
)
(
)
=
=
+
0 8 1
1
2
((
)
V
OUT
F
+
Minimum Load Requirement
The LT3573 obtains output voltage information through
thetransformerwhilethesecondarywindingisconducting
current. During this time, the output voltage (multiplied
times the turns ratio) is presented to the primary side of
the transformer. The LT3573 uses this reflected signal to
regulate the output voltage. This means that the LT3573
must turn on every so often to sample the output voltage,
which delivers a small amount of energy to the output.
This sampling places a minimum load requirement on the
output of 1% to 2% of the maximum load.
BIAS Pin Considerations
For applications with an input voltage less than 15V, the
BIAS pin is typically connected directly to the VIN pin. For
input voltages greater than 15V, it is preferred to leave the
BIAS pin separate form the VIN pin. In this condition, the
BIAS pin is regulated with an internal LDO to a voltage of
3V. By keeping the BIAS pin separate from the input voltage
at high input voltages, the physical size of the capacitors
can be minimized (the BIAS pin can then use a 6.3V or
10V rated capacitor).
Overdriving the BIAS Pin with a Third Winding
The LT3573 provides excellent output voltage regulation
without the need for an opto-coupler, or third winding, but
for some applications with higher input voltages (>20V),
it may be desirable to add an additional winding (often
called a third winding) to improve the system efficiency.
For proper operation of the LT3573, if a winding is used as
a supply for the BIAS pin, ensure that the BIAS pin voltage
is at least 3.15V and always less than the input voltage.
For a typical 24VIN application, overdriving the BIAS pin
will improve the efficiency gain 4-5%.
Loop Compensation
The LT3573 is compensated using an external resistor-
capacitor network on the VC pin. Typical values are in the
range of RC = 50k and CC = 1nF (see the numerous sche-
maticsintheTypicalApplicationssectionforotherpossible
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT3573EMSE#PBF | 1.85 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3573IMSETRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Isolated Flyback Converter without an Opto-Coupler |
| LT3573IMSE-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Isolated Flyback Converter Without an Opto-Coupler |
| LT3574 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Isolated Flyback Converter Without an Opto-Coupler |
| LT3574EMS | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Isolated Flyback Converter Without an Opto-Coupler |
| LT3574EMS#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: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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