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参数资料
| 型号： | EL7562CUZ |
| 厂商： | Intersil |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 16QSOP |
| 标准包装： | 97 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1 V ~ 3.8 V |
| 输入电压： | 3.5 V ~ 5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 是 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 16-QSOP |
| 产品目录页面： | 1242 (CN2011-ZH PDF) |
Block Diagram
VREF
0.1μF
COSC
270pF
Junction
Temperature
Controller
Voltage
Reference
Oscillator
VDRV
VHI
Supply
39 Ω
VDD
VIN
5V
0.1μF
PWM
Controlle
Drivers
Powe r
FET
0.1μF
4.7μH
V OUT
EN
Current
Sense
Powe r
FET
PGND
100μF
2370 Ω
1k Ω
SGND
Applications Information
Circuit Description
General
FB
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-
The EL7562 is a fixed frequency, current mode controlled
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 synchronous step-
down regulator suitable for use in DSP core power supplies.
Theory of Operation
The EL7562 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 EL7562 regulates output voltage through the use of
current-mode controlled pulse width modulation. The three
main elements in a PWM controller are the feedback loop
and reference, a pulse width modulator whose duty cycle is
controlled by the feedback error signal, and a filter which
7
mode control utilizes dual feedback loops to provide both
output voltage and inductor current information to the
controller. The voltage 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 voltage 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 bandwidth and
poor transient response. By directly monitoring changes in
inductor current via a series sense resistor the controller's
response time is not entirely limited 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-feedback ratio the overall loop response
will approach a one-pole system. The resulting system offers
several advantages over traditional voltage control systems,
including simpler loop compensation, pulse by pulse current
limiting, rapid response to line variation and good load step
response.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EL7562CUZ-T13 | 功能描述:直流/直流开关转换器 2A DC-DC CNVRTR RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| EL7562CUZ-T7 | 功能描述:直流/直流开关转换器 2A DC-DC CNVRTR RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| EL7563 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Monolithic 4 Amp DC:DC Step-Down Regulator |
| EL7563C | 制造商:ELANTEC 制造商全称:ELANTEC 功能描述:Monolithic 4 Amp DC:DC Step-down Regulator |
| EL7563CM | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
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