- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄353101 > EL7562CU-T7 (INTERSIL CORP) Monolithic 2Amp DC-DC Step-Down Regulator PDF資料下載
參數(shù)資料
| 型號(hào)： | EL7562CU-T7 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Monolithic 2Amp DC-DC Step-Down Regulator |
| 中文描述： | 3 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | QSOP-16 |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大?。?/td> | 241K |
| 代理商： | EL7562CU-T7 |
7
EL7562C - Preliminary
Monolithic 2 Amp DC:DC Step-down Regulator
E
L
75
62
C
-
P
re
lim
in
ar
y
Applications Information
Circuit Description
General
The EL7562C is a fixed frequency, current mode con-
trolled DC:DC converter with integrated N-channel
power MOSFETs and a high precision reference. The
device incorporates all the active circuitry required to
implement a cost effective, user-programmable 2A syn-
chronous step-down regulator suitable for use in DSP
core power supplies.
Theory of Operation
The EL7562C is composed of 5 major blocks:
1. PWM Controller
2. NMOS Power FETs and Drive Circuitry
3. Bandgap Reference
4. Oscillator
5. Thermal Shut-down
PWM Controller
The EL7562C regulates output voltage through the use
of current-mode controlled pulse width modulation. The
three main elements in a PWM controller are the feed-
back loop and reference, a pulse width modulator whose
duty cycle is controlled by the feedback error signal, and
a filter which averages the logic level modulator output.
In a step-down (buck) converter, the feedback loop
forces the time-averaged output of the modulator to
equal the desired output voltage. Unlike pure voltage-
mode control systems, current-mode control utilizes
dual feedback loops to provide both output voltage and
inductor current information to the controller. The volt-
age loop minimizes DC and transient errors in the output
voltage by adjusting the PWM duty-cycle in response to
changes in line or load conditions. Since the output volt-
age is equal to the time-averaged of the modulator
output, the relatively large LC time constant found in
power supply applications generally results in low band-
width and poor transient response. By directly
monitoring changes in inductor current via a series sense
resistor the controller's response time is not entirely lim-
ited by the output LC filter and can react more quickly to
changes in line and load conditions. This feed-forward
characteristic also simplifies AC loop compensation
since it adds a zero to the overall loop response. Through
proper selection of the current-feedback to voltage-feed-
back ratio the overall loop response will approach a one-
pole system. The resulting system offers several advan-
tages over traditional voltage control systems, including
simpler loop compensation, pulse by pulse current limit-
ing, rapid response to line variation and good load step
response.
The heart of the controller is an input direct summing
comparator which sum voltage feedback, current feed-
back, slope compensation ramp and power tracking
signals together. Slope compensation is required to pre-
vent system instability that occurs in current-mode
topologies operating at duty-cycles greater than 50%
and is also used to define the open-loop gain of the over-
all system. The slope compensation is fixed internally
and optimized for 500mA inductor ripple current. The
power tracking will not contribute any input to the com-
parator steady-state operation. Current feedback is
measured by the patented sensing scheme that senses the
inductor current flowing through the high-side switch
whenever it is conducting. At the beginning of each
oscillator period the high-side NMOS switch is turned
on. The comparator inputs are gated off for a minimum
period of time of about 150ns (LEB) after the high-side
switch is turned on to allow the system to settle. The
Leading Edge Blanking (LEB) period prevents the
detection of erroneous voltages at the comparator inputs
due to switching noise. If the inductor current exceeds
the maximum current limit (ILMAX) a secondary over-
current comparator will terminate the high-side switch
on time. If ILMAX has not been reached, the feedback
voltage FB derived from the regulator output voltage
VOUT is then compared to the internal feedback refer-
ence voltage. The resultant error voltage is summed with
the current feedback and slope compensation ramp. The
high-side switch remains on until all four comparator
inputs have summed to zero, at which time the high-side
switch is turned off and the low-side switch is turned on.
However, the maximum on-duty ratio of the high-side
switch is limited to 95%. In order to eliminate cross-con-
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| EL5293CY-T13 | Dual 300MHz Current Feedback Amplifier with Enable |
| EL5293CY-T7 | Dual 300MHz Current Feedback Amplifier with Enable |
| EL5244CYZ | 100MHz Single-Supply Rail-to-Rail Amplifiers |
| EL5244CYZ-T13 | 100MHz Single-Supply Rail-to-Rail Amplifiers |
| EL5244CYZ-T7 | 100MHz Single-Supply Rail-to-Rail Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL7562CUZ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 2A DC-DC CNVRTR RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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 |
| EL7562CUZ-T13 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 2A DC-DC CNVRTR RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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 |
| EL7562CUZ-T7 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 2A DC-DC CNVRTR RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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 |
| EL7563 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Monolithic 4 Amp DC:DC Step-Down Regulator |
| EL7563C | 制造商:ELANTEC 制造商全稱:ELANTEC 功能描述:Monolithic 4 Amp DC:DC Step-down Regulator |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。