参数资料
| 型号： | EL7584IRZ-T7 |
| 厂商： | Intersil |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC CONV DC/DC 4-CHAN 24-TSSOP |
| 标准包装： | 1,000 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 2 V ~ 14 V |
| 输出数： | 2 |
| 输出电压： | 5 V ~ 17 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 24-TSSOP |
| 包装： | 带卷 (TR) |
EL7584
Two-Stage Negative Charge Pump Circuit
V DDN
R ONP
5V-17V
V LX
C CPN
DRVN
R ONN
C CPN
C OUT2
C OUT2
V OFF
V SSN
R 21
+
FBN
V OFF ( max ) ≥ I OUT × 2 × ( R ONN + R ONP ) + 2 × V DIODE - I OUT × -------------------------------------------- - I OUT × ------------------------------------------------ -
0.5 × F × C 0.5 × F × C
V DDN - N × V LX ( max ) + N × ? 2 × V DIODE + I OUT × -------------------------------------------- + I OUT × ------------------------------------------------ ?
0.5 × F S × C OUT2 ?
0.5 × F S × C CPN
V OFF = -V REF × ----------
R
-
R 22
V REF
The maximum V OFF output voltage for N+1 stage charge pump is:
1 1
S CPN S OUT2
1 1
?
R 21 and R 22 determine V OFF output voltage:
R 21
22
where V REF is 1.310V.
The V COM Buffer
The V COM buffer is designed to control the voltage on the
back plane of an LCD display. This plane is capacitively
coupled to the pixel drive voltage which alternately cycles
positive and negative at the line rate for the display. Thus the
If V BOOST exceeds 15V, V DDC must be protected from over-
voltage by including a zener diode between V BOOST and
V DDC .
V BOOST
V SSC
amplifier must be capable of sourcing and sinking capacitive
pulses of current, which can occasionally be quite large (a
few 100mA for typical applications).
The use of the V COM Buffer is illustrated in Figure 21. Here,
a voltage, corresponding to the mid-DAC potential, is
generated by a resistive divider and buffered by the
R 32
R 31
INC
+ V DDC
-
0.1μF
V COM
V COM
1μF
CERAMIC
LOW ESR
amplifier. The amplifier's stability is designed to be
dominated by the load capacitance, thus for very short
duration pulses (< 1μs) the output capacitor supplies the
current. For longer pulses the V COM buffer supplies the
current. By virtue of its high transconductance which
progressively increases as more current is drawn, it can
maintain regulation within 5mV as currents up to 50mA are
drawn, while consuming only 1.5mA of quiescent current.
13
FIGURE 21. V COM USED AS A VOLTAGE BUFFER
As with any high performance buffer, there are several
design issues that must be considered when using the part.
These are summarized below.
Good Decoupling of Power Supplies
This is essential for this component and 1μF ceramic low
ESR decoupling capacitors are recommended. These
should be placed close to the pins.
Choice of Output Capacitor
A 1μF ceramic capacitor with low ESR (X5R or X7R type) is
recommended for this amplifier. This capacitor determines
the stability of the amplifier. Reducing it will make the
amplifier less stable, and should be avoided. With a 1μF
capacitor, the unity gain bandwidth of the amplifier is close to
FN7317.2
February 4, 2005
相关PDF资料 |
PDF描述 |
|---|---|
| EL7585AILZ-T7 | IC POWER SUPPLY TFT-LCD 20-QFN |
| EL7585ILZ-T7 | IC POWER SUPPLY TFT-LCD 20-QFN |
| EL7586ILZ | IC POWER SUPPLY TFT-LCD 20-QFN |
| EL7640AILTZ | IC CONV DC/DC TFT-LCD 32-QFN |
| EL7642ILTZ | IC BOOST REG DC/DC TFT-LCD 32QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EL7585 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:TFT-LCD Power Supply |
| EL7585_06 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:TFT-LCD Power Supply |
| EL7585A | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:TFT-LCD Power Supply |
| EL7585AILZ | 功能描述:IC POWER SUPPLY TFT-LCD 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| EL7585AILZ-T13 | 功能描述:IC POWER SUPPLY TFT-LCD 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
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