参数资料
| 型号： | EL7585ILZ-T7 |
| 厂商： | Intersil |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY TFT-LCD 20-QFN |
| 标准包装： | 1,000 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 3 V ~ 5 V |
| 输出数： | 4 |
| 输出电压： | 5.5 V ~ 20 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN 裸露焊盘（4x4） |
| 包装： | 带卷 (TR) |
EL7585
N NEGATIVE ≥ -------------------------------------------------
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
the transistor. V F is the forward-voltage of the charge pump
rectifier diode.
The number of negative charge pump stages is given by:
V OUTPUT + V CE
V INPUT – 2 × V F
To achieve high efficiency and low material cost, the lowest
number of charge pump stages which can meet the above
requirements, is always preferred.
High Charge Pump Output Voltage (>36V)
Applications
In the applications where the charge pump output voltage is
over 36V, an external npn transistor need to be inserted into
between DRVP pin and base of pass transistor Q3 as shown
in Figure 24; or the linear regulator can control only one
stage charge pump and regulate the final charge pump
output as shown in Figure 25.
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
DRVP
CHARGE PUMP
V IN OUTPUT
OR A VDD
7k ?
Q3
NPN
V ON = V REF × ? 1 + ---------- ?
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:
? R 12 ?
? R 11 ?
EL7585
FBP
CASCODE
TRANSISTOR
V ON
V OFF = V REFN + ---------- × ( V REFN – V REF )
R
R 22
21
FIGURE 24. CASCODE NPN TRANSISTOR CONFIGURATION
FOR HIGH CHARGE PUMP OUTPUT VOLTAGE
(>36V)
V LOGIC = V REF × ? 1 + ---------- ?
? R 42 ?
? R 41 ?
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.
0.1μF
7k ?
0.1μF
LX
A VDD
N POSITIVE ≥ --------------------------------------------------------------
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:
V OUT + V CE – V INPUT
V INPUT – 2 × V F
EL7585
DRVP
FBP
0.47μF
Q3
0.1μF
0.1μF
0.1μF
V ON
(>36V)
0.22μF
where V CE is the dropout voltage of the pass component of
the linear regulator. It ranges from 0.3V to 1V depending on
13
FIGURE 25. THE LINEAR REGULATOR CONTROLS ONE
STAGE OF CHARGE PUMP
FN7345.2
March 9, 2006
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EL7586 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:TFT-LCD Power Supply |
| EL7586_06 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:TFT-LCD Power Supply |
| EL7586A | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:TFT-LCD Power Supply |
| EL7586AILZ | 功能描述:直流/直流开关调节器 EL7586AILZ TFT-LCD PWR SUPY RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| EL7586AILZ-T13 | 功能描述:直流/直流开关调节器 EL7586AILZ TFT-LCD P PWR SUPY RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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