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參數(shù)資料
| 型號(hào)： | EL7581IREZ-T13 |
| 廠商： | INTERSIL CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 3-Channel DC-DC Converter |
| 中文描述： | 2.75 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | ROHS COMPLIANT, MO-153, HTSSOP-20 |
| 文件頁(yè)數(shù)： | 11/17頁(yè) |
| 文件大?。?/td> | 839K |
| 代理商： | EL7581IREZ-T13 |
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11
Applications Information
The EL7581 is high efficiency multiple output power solution
designed specifically for thin-film transistor (TFT) liquid
crystal display (LCD) applications. The device contains one
high current boost converter and two low power charge
pumps (V
ON
and V
OFF
).
The boost converter contains an integrated N-channel
MOSFET to minimize the number of external components.
The converter output voltage can be set from 5V to 18V with
external resistors. The V
ON
and V
OFF
charge pumps are
independently regulated to positive and negative voltages
using external resistors. Output voltages as high as 40V can
be achieved with additional capacitors and diodes.
Boost Converter
The boost converter operates in constant frequency pulse-
width-modulation (PWM) mode. Quiescent current for the
EL7581 is only 5mA when enabled, and since only the low
side MOSFET is used, switch drive current is minimized.
90% efficiency is achieved in most common application
operating conditions.
A functional block diagram with typical circuit configuration is
shown on the previous page. Regulation is performed by the
PWM comparator which regulates the output voltage by
comparing a divided output voltage with an internal
reference voltage. The PWM comparator outputs its result to
the PWM logic. The PWM logic switches the MOSFET on
and off through the gate drive circuit. Its switching frequency
is external adjustable with a resistor from timing control pin
(R
OSC
) to ground. The boost converter has 200kHz to
1.2MHz operating frequency range.
Start-Up
After V
DDB
reaches a threshold of about 2V, the power
MOSFET is controlled by the start-up oscillator, which
generates fixed duty-ratio of 0.5 - 0.7 at a frequency of
several hundred kilohertz. This will boost the output voltage,
providing the initial output current load is not too great
(<250mA).
When V
DDB
reaches about 3.7V, the PWM comparator
takes over the control. The duty ratio will be decided by the
multiple-input direct summing comparator, Max_Duty signal
(about 90% duty-ratio), and the Current Limit Comparator,
whichever is the smallest.
The soft-start is provided by the current limit comparator. As
the internal 12μA current source charges the external soft-
start capacitor, the peak MOSFET current is limited by the
voltage on the capacitor. This in turn controls the rising rate
of output voltage.
The regulator goes through the start-up sequence as well
after the ENBN signal is pulled to HI.
Steady-State Operation
When the output reaches the preset voltage, the regulator
operates at steady state. Depending on the input/output
condition and component, the inductor operates at either
continuous-conduction mode or discontinuous-conduction
mode.
In the continuous-conduction mode, the inductor current is a
triangular waveform and LX voltage a pulse waveform. In the
discontinuous-conduction mode, the inductor current is
completely ‘dried-out’ before the MOSFET is turned on
again. The input voltage source, the inductor, and the
MOSFET and output diode parasitic capacitors forms a
resonant circuit. Oscillation will occur in this period. This
oscillation is normal and will not affect the regulation.
At very low load, the MOSFET will skip pulse sometimes.
This is normal.
Current Limit
The MOSFET current limit is nominal I
LMT
= 2.75A. This
restricts the maximum output current I
OMAX
based on the
following formula:
V
O
where:
I
L
is the inductor peak-to-peak current ripple and is
decided by:
V
S
D is the MOSFET turn-on radio and is decided by:
F
S
is the switching frequency.
The following table gives typical values:
(Margins are considered in deriving I
OMAX
. They are 10%,
3%, 20%, 10%, and 20% on V
IN
, V
O
, L, F
S
, and I
LMT
,
respectively.)
TABLE 1. MAXIMUM CONTINUOUS OUTPUT CURRENT
V
IN
(V)
V
O
(V)
L (μH)
F
S
(kHz)
I
OMAX
(mA)
3.3
5
10
1000
1200
3.3
9
10
1000
660
3.3
12
10
1000
490
3.3
15
10
1000
390
5
9
10
1000
980
5
12
10
1000
720
5
15
10
1000
570
12
15
10
1000
1300
12
18
10
1000
1100
I
OMAX
I
LMT
L
2
------
–
---------
×
=
I
L
---------
------
×
=
D
V
- V
IN
O
-----------------------
=
EL7581
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| EL7581IREZ-T7 | 3-Channel DC-DC Converter |
| EL7583IR-T7 | 3-Channel DC-DC Converter |
| EL7583IR-T13 | 3-Channel DC-DC Converter |
| EL7583 | 3-Channel DC-DC Converter |
| EL7583IR | 3-Channel DC-DC Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL7581IREZ-T7 | 功能描述:IC CONV DC/DC 3-CHAN 20-HTSSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專(zhuān)用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| EL7583 | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:3-Channel DC-DC Converter |
| EL7583_06 | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:3-Channel DC/DC Converter |
| EL7583IR | 功能描述:IC CONV DC/DC 3-CHAN 20-TSSOP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專(zhuān)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(lèi)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) |
| EL7583IREZ | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 EL7583IREZ 3 CH DC/D C CNVRTR RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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