參數(shù)資料
型號(hào)： EL7585
廠商： Intersil Corporation
英文描述： TFT-LCD Power Supply
中文描述： TFT - LCD的電源供應(yīng)器
文件頁(yè)數(shù)： 9/18頁(yè)
文件大小： 732K
代理商： EL7585
9
FN7345.1
July 1, 2005
Boost Converter
The main boost converter is a current mode PWM converter at
a fixed frequency of 1MHz which enables the use of low profile
inductors and multilayer ceramic capacitors. This results in a
compact, low cost power system for LCD panel design.
The EL7585 is designed for continuous current mode, but
they can also operate in discontinuous current mode at light
load. In continuous current mode, current flows continuously
in the inductor during the entire switching cycle in steady
state operation. The voltage conversion ratio in continuous
current mode is given by:
Where D is the duty cycle of the switching MOSFET.
Figure 21 shows the block diagram of the boost regulator. It
uses a summing amplifier architecture consisting of GM
stages for voltage feedback, current feedback and slope
compensation. A comparator looks at the peak inductor
current cycle by cycle and terminates the PWM cycle if the
current limit is reached.
An external resistor divider is required to divide the output
voltage down to the nominal reference voltage. Current
drawn by the resistor network should be limited to maintain
the overall converter efficiency. The maximum value of the
resistor network is limited by the feedback input bias current
and the potential for noise being coupled into the feedback
pin. A resistor network in the order of 60k
is recommended.
The boost converter output voltage is determined by the
following equation:
The current through the MOSFET is limited to 3.5A peak.
This restricts the maximum output current based on the
following equation:
Where
IL is peak to peak inductor ripple current, and is set by:
V
f
S
where f
S
is the switching frequency.
A
IN
---------------
D
---–
=
A
VDD
R
--------------------
R
2
+
1
V
REF
×
=
I
OMAX
I
LMT
I
L
2
--------
–
V
V
O
---------
×
=
I
L
---------
D
----
×
=
Iref
Iref
FBB
Ifb
Ifb
CINT
VOLTAGE
AMPLIFIER
LX
PGND
SHUTDOWN
& START-UP
CONTROL
GM
AMPLIFIER
SLOPE
COMPENSATION
BUFFER
PWM
LOGIC
CURRENT
AMPLIFIER
CLOCK
REFERENCE
GENERATOR
FIGURE 21. BLOCK DIAGRAM OF THE BOOST REGULATOR
EL7585
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EL7585_06 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:TFT-LCD Power Supply
EL7585A 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:TFT-LCD Power Supply
EL7585AILZ 功能描述:IC POWER SUPPLY TFT-LCD 20-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR)
EL7585AILZ-T13 功能描述:IC POWER SUPPLY TFT-LCD 20-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR)
EL7585AILZ-T7 功能描述:IC POWER SUPPLY TFT-LCD 20-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR)
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