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參數(shù)資料
| 型號： | EL7586ILZ-T7 |
| 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)： | 15/21頁 |
| 文件大?。?/td> | 772K |
| 代理商： | EL7586ILZ-T7 |
15
FN9210.1
October 7, 2005
the transistor. V
F
is the forward-voltage of the charge pump
rectifier diode.
The number of negative charge pump stages is given by:
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 31; or the linear regulator can control only one
stage charge pump and regulate the final charge pump
output as shown in Figure 32.
Discontinuous/Continuous Boost Operation and
it's Effect on the Charge Pumps
The EL7586 and EL7586A V
ON
and V
OFF
architecture uses
LX switching edges to drive diode charge pumps from which
LDO regulators generate the V
ON
and V
OFF
supplies. It can
be appreciated that should a regular supply of LX switching
edges be interrupted, for example during discontinuous
operation at light A
VDD
boost load currents, then this may
affect the performance of V
ON
and V
OFF
regulation -
depending on their exact loading conditions at the time.
To optimize V
ON
/V
OFF
regulation, the boundary of
discontinuous/continuous operation of the boost converter
can be adjusted, by suitable choice of inductor given V
IN
,
V
OUT
, switching frequency and the A
VDD
current loading, to
be in continuous operation.
The following equation gives the boundary between
discontinuous and continuous boost operation. For
continuous operation (LX switching every clock cycle) we
require that:
I(A
VDD
_load) > D*(1-D)*V
IN
/(2*L*F
OSC
)
where the duty cycle, D = (A
VDD
- V
IN
)/A
VDD
For example, with V
IN
= 5V, F
OSC
= 1.0MHz and A
VDD
=
12V we find continuous operation of the boost converter can
be guaranteed for:
L = 10μH and I(A
VDD
) > 61mA
L = 6.8μH and I(A
VDD
) > 89mA
L = 3.3μH and I(A
VDD
) > 184mA
N
NEGATIVE
V
INPUT
V
F
+
------------------------–
≥
V
IN
OR A
VDD
CHARGE PUMP
OUTPUT
7k
Q3
FBP
EL7586
EL7586A
DRVP
NPN
CASCODE
TRANSISTOR
V
ON
FIGURE 31. CASCODE NPN TRANSISTOR CONFIGURATION
FOR HIGH CHARGE PUMP OUTPUT VOLTAGE
(>36V)
V
ON
(>36V)
0.1μF
0.1μF
0.1μF
0.1μF
7k
.47μF
0.22μF
0.1μF
A
VDD
LX
Q3
FBP
EL7586
EL7586A
DRVP
FIGURE 32. THE LINEAR REGULATOR CONTROLS ONE
STAGE OF CHARGE PUMP
EL7586, EL7586A
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PDF描述 |
|---|---|
| EL7586 | TFT-LCD Power Supply |
| EL7586AILZ | TFT-LCD Power Supply |
| EL7586AILZ-T13 | TFT-LCD Power Supply |
| EL7586AILZ-T7 | TFT-LCD Power Supply |
| EL7630IWTZ | White LED Boost Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL7630 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:White LED Boost Regulator |
| EL7630_06 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:White LED Boost Regulator |
| EL7630ICZ | 制造商:Intersil Corporation 功能描述:LED DRVR 6SEGMENT 2.7V TO 5.5V 6PIN SC-70 - Bulk |
| EL7630ICZ-T7 | 功能描述:LED顯示驅(qū)動器 EL7630ICZ WHT LED BOOSTG RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| EL7630ICZ-T7A | 功能描述:LED顯示驅(qū)動器 EL7630ICZ WHT LED BOOSTG RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
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