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參數(shù)資料
| 型號： | EL7584IRZ-T13 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4-Channel DC:DC Converter |
| 中文描述： | 1.75 A SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | LEAD FREE, MO-153, TSSOP-24 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 860K |
| 代理商： | EL7584IRZ-T13 |
13
FN7317.2
February 4, 2005
Two-Stage Negative Charge Pump Circuit
-
+
V
SSN
DRVN
FBN
V
DDN
C
CPN
C
OUT2
V
LX
C
OUT2
R
21
R
22
C
CPN
V
REF
V
OFF
5V-17V
R
ONN
R
ONP
The maximum V
OFF
output voltage for N+1 stage charge pump is:
V
OFF
max
(
)
I
OUT
2
R
ONN
(
R
ONP
)
2
V
DIODE
- I
OUT
S
I
OUT
CPN
×
--------------------------------------------
×
×
+
+
×
×
- I
OUT
S
OUT2
-----------------------------------------------
-
V
DDN
×
- N
V
LX
max
(
)
N
2
V
DIODE
I
OUT
S
CPN
--------------------------------------------
×
+
×
×
+
×
0.5
F
S
C
OUT2
×
+
≥
R
21
and R
22
determine V
OFF
output voltage:
V
OFF
-V
REF
R
R
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
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
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.
If V
BOOST
exceeds 15V, V
DDC
must be protected from over-
voltage by including a zener diode between V
BOOST
and
V
DDC
.
-
+
R
32
R
31
V
BOOST
V
COM
1μF
CERAMIC
LOW ESR
INC
V
COM
V
DDC
V
SSC
FIGURE 21. V
COM
USED AS A VOLTAGE BUFFER
0.1μF
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
EL7584
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| EL7584IRZ-T7 | 功能描述:IC CONV DC/DC 4-CHAN 24-TSSOP 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) |
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| EL7585_06 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:TFT-LCD Power Supply |
| EL7585A | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:TFT-LCD Power Supply |
| EL7585AILZ | 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) |
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