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参数资料
| 型号： | MAX5975AETE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO CM 16TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 600kHz |
| 占空比： | 84% |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 包装： | 管件 |
19-5545; Rev 0; 9/10
Current-Mode PWM Controllers with Frequency
Dithering for EMI-Sensitive Power Supplies
General Description
The MAX5975_ current-mode PWM controllers contain
all the control circuitry required for the design of wide-
input-voltage forward and flyback power supplies in
Power-over-Ethernet (PoE) IEEE? 802.3af/at powered
devices. The MAX5975A is well-suited for universal input
(rectified 85V AC to 265V AC) or telecom (-36V DC to
-72V DC) power supplies. The MAX5975B is available for
low-voltage supplies (12V to 24V) such as wall adapters.
The devices are suitable for both isolated and noniso-
lated designs. Because the devices have an internal error
amplifier with a 1% accurate reference, they can be used
in nonisolated power supplies without the need for an
external shunt regulator.
An enable input (EN) is used to shut down the devices.
Programmable soft-start eliminates output voltage over-
shoot. The MAX5975A has an internal bootstrap UVLO
with large hysteresis that requires 20V for startup, while
the MAX5975B requires 10V for startup.
The switching frequency for the ICs is programmable
from 100kHz to 600kHz with an external resistor. For
EMI-sensitive design, use the programmable frequency
dithering feature for low-EMI spread-spectrum opera-
tion. The duty cycle is also programmable up to the 80%
maximum duty-cycle limit. These devices are available in
16-lead TQFN packages and are rated for operation over
the -40°C to +85°C temperature range.
Features
S Peak Current-Mode Control, Forward/Flyback
PWM Controllers
S Internal 1% Error Amplifier
S 100kHz to 600kHz Programmable ±8% Switching
Frequency
S Switching Frequency Synchronization Up to
1.2MHz
S Programmable Frequency Dithering for Low-EMI
Spread-Spectrum Operation
S PWM Soft-Start, Current Slope Compensation
S Programmable Feed-Forward Maximum Duty-
Cycle Clamp, 80% Maximum Limit
S Frequency Foldback for High-Efficiency Light-
Load Operation
S Internal Bootstrap UVLO with Large Hysteresis
S 100μA (typ) Startup Supply Current
S Fast Cycle-by-Cycle Peak Current-Limit, 35ns
Typical Propagation Delay
S 115ns Current-Sense Internal Leading-Edge
Blanking
S Output Short-Circuit Protection with Hiccup Mode
S 3mm x 3mm, Lead-Free, 16-Pin TQFN
Applications
PoE IEEE 802.3af/at Powered Devices
Flyback/Forward DC-DC Converters
IP Phones
Wireless Access Nodes
Security Cameras
Power Devices in PoE/Power-over-MDI
Ordering Information
PART
MAX5975A ETE+
MAX5975B ETE+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 TQFN-EP*
16 TQFN-EP*
TOP MARK
+AIC
+AID
UVLO THRESHOLD (V)
20
10
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
IEEE is a registered service mark of the Institute of Electrical and Electronics Engineers, Inc.
_______________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5975AETE+ | 功能描述:电流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX5975AETE+T | 功能描述:电流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX5975BETE+ | 功能描述:电流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX5975BETE+T | 功能描述:电流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX5975CETE+ | 制造商:Maxim Integrated Products 功能描述:CURRENT-MODE PWM CONTROLLERS WITH FREQUENCY DITHERING FOR EM - Rail/Tube |
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