參數(shù)資料
型號(hào)： EL7585IL-T13
廠商： INTERSIL CORP
元件分類： 穩(wěn)壓器
英文描述： TFT-LCD Power Supply
中文描述： 3.5 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, QCC20
封裝： 4 X 4 MM, MO-220, QFN-20
文件頁(yè)數(shù)： 12/18頁(yè)
文件大小： 732K
代理商： EL7585IL-T13
12
FN7345.1
July 1, 2005
The V
ON
power supply is used to power the positive supply
of the row driver in the LCD panel. The DC/DC consists of an
external diode-capacitor charge pump powered from the
inductor (LX) of the boost converter, followed by a low
dropout linear regulator (LDO_ON). The LDO_ON regulator
uses an external PNP transistor as the pass element. The
onboard LDO controller is a wide band (>10MHz)
transconductance amplifier capable of 4mA drive current,
which is sufficient for up to 40mA or more output current
under the low dropout condition (forced beta of 10). Typical
V
ON
voltage supported by EL7585 ranges from +15V to
+36V. A fault comparator is also included for monitoring the
output voltage. The under-voltage threshold is set at 25%
below the 1.2V reference.
The V
OFF
power supply is used to power the negative
supply of the row driver in the LCD panel. The DC/DC
consists of an external diode-capacitor charge pump
powered from the inductor (LX) of the boost converter,
followed by a low dropout linear regulator (LDO_OFF). The
LDO_OFF regulator uses an external NPN transistor as the
pass element. The onboard LDO controller is a wide band
(>10MHz) transconductance amplifier capable of 4mA drive
current, which is sufficient for up to 40mA or more output
current under the low dropout condition (forced beta of 10).
Typical V
OFF
voltage supported by EL7585 ranges from -5V
to -20V. A fault comparator is also included for monitoring
the output voltage. The undervoltage threshold is set at
200mV above the 0.2V reference level.
The V
LOGIC
power supply is used to power the logic circuitry
within the LCD panel. The DC/DC may be powered directly
from the low voltage input, 3.3V or 5.0V, or it may be
powered through the fault protection switch. The
LDO_LOGIC regulator uses an external PNP transistor as
the pass element. The onboard LDO controller is a wide
band (>10MHz) transconductance amplifier capable of
16mA drive current, which is sufficient for up to 160mA or
more output current under the low dropout condition (forced
beta of 10). Typical V
LOGIC
voltage supported by EL7585
ranges from +1.3V to V
DD
-0.2V. A fault comparator is also
included for monitoring the output voltage. The undervoltage
threshold is set at 25% below the 1.2V reference.
Set-Up Output Voltage
Refer to the Typical Application Diagram, the output voltages
of V
ON
, V
OFF
, and V
LOGIC
are determined by the following
equations:
Where V
REF
= 1.2V, V
REFN
= 0.2V.
Resistor networks in the order of 250k
, 120k
and 10k
are recommended for V
ON
, V
OFF
and V
LOGIC
, respectively.
Charge Pump
To generate an output voltage higher than V
BOOST
, single or
multiple stages of charge pumps are needed. The number of
stage is determined by the input and output voltage. For
positive charge pump stages:
where V
CE
is the dropout voltage of the pass component of
the linear regulator. It ranges from 0.3V to 1V depending on
-
+
GMN
-
+
36V
ESD
CLAMP
LDO_OFF
1: Nn
FBN
DRVN
0.1μF
0.1μF
CP (TO -26V)
R
BN
3k
C
OFF
V
OFF
(TO -20V)
LX
R
N1
R
N2
20k
V
REF
PG_LDON
0.4V
Q2
FIGURE 24. V
OFF
FUNCTIONAL BLOCK DIAGRAM
-
+
GML
-
+
LDO_LOG
PG_LDOL
1: N1
FBL
DRVL
V
IN
OR V
(3V TO 6V)
20k
R
L2
R
L1
C
LOG
10μF
V
(1.3V TO 3.6V)
0.9V
500
R
BL
Q5
FIGURE 25. V
LOGIC
FUNCTIONAL BLOCK DIAGRAM
V
ON
V
REF
1
R
11
---------
+
×
=
V
OFF
V
REFN
R
R
21
---------
V
REFN
V
REF
–
(
)
×
+
=
V
LOGIC
V
REF
1
R
R
41
---------
+
×
=
N
POSITIVE
V
------------------+
V
V
V
F
2
V
INPUT
×
–
≥
EL7585
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EL7585IL-T7 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:TFT-LCD Power Supply
EL7585ILZ 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)
EL7585ILZ-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)
EL7585ILZ-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)
EL7586 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:TFT-LCD Power Supply
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