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參數(shù)資料
| 型號： | EL7586AILZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | TFT-LCD Power Supply |
| 中文描述： | 2 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, QCC20 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, MO-220, QFN-20 |
| 文件頁數(shù)： | 14/21頁 |
| 文件大?。?/td> | 772K |
| 代理商： | EL7586AILZ |
14
FN9210.1
October 7, 2005
FIGURE 29. V
OFF
FUNCTIONAL BLOCK DIAGRAM
FIGURE 30. V
LOGIC
FUNCTIONAL BLOCK DIAGRAM
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 EL7586 and EL7586A ranges
from +15V to +36V. A fault comparator is also included for
monitoring the output voltage. The undervoltage 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 EL7586 and EL7586A
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 EL7586
and EL7586A 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
R
BN
3k
0.1μF
0.1μF
CP (TO -26V)
C
OFF
V
OFF
(TO -20V)
LX
R
N1
R
N2
20k
V
REF
PG_LDON
0.4V
Q2
-
+
GML
-
+
LDO_LOG
PG_LDOL
1 : N1
FBL
DRVL
V
IN
OR V
PROT
(3V TO 6V)
20k
R
L2
R
L1
C
LOG
10μF
V
(1.3V TO 3.6V)
0.9V
500
R
BL
Q5
V
ON
V
REF
1
R
R
11
---------
+
×
=
V
OFF
V
REFN
R
R
21
---------
V
REFN
V
REF
–
(
)
×
+
=
V
LOGIC
V
REF
1
R
41
---------
+
×
=
N
POSITIVE
V
--------------------------------–
V
V
F
–
+
INPUT
≥
EL7586, EL7586A
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| EL7586AILZ-T13 | 功能描述:直流/直流開關調節(jié)器 EL7586AILZ TFT-LCD P PWR SUPY RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| EL7586AILZ-T7 | 功能描述:直流/直流開關調節(jié)器 EL7586AILZ TFT-LCD PWR SUPY RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| EL7586ILZ | 功能描述:直流/直流開關調節(jié)器 EL7586ILZ TFT-LCD PWR SUPY RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| EL7586ILZ-T13 | 功能描述:直流/直流開關調節(jié)器 EL7586ILZ TFT-LCD PWR SUPY RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| EL7586ILZ-T7 | 功能描述:直流/直流開關調節(jié)器 EL7586ILZ TFT-LCD PWR SUPY RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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