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| 型号： | MAX5974AEVKIT# |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/27页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT MAX5974A |
| 标准包装： | 1 |
| 系列： | * |
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EVALUATION KIT AVAILABLE
MAX5974A/MAX5974B/MAX5974C/MAX5974D
Active-Clamped, Spread-Spectrum,
Current-Mode PWM Controllers
General Description
The MAX5974_ provide control for wide-input-voltage,
active-clamped, current-mode PWM, forward converters
in Power-over-Ethernet (PoE) powered device (PD) appli-
cations. The MAX5974A/MAX5974C are well-suited for
universal or telecom input range, while the MAX5974B/
MAX5974D also accommodate low input voltage down
to 10.5V.
The devices include several features to enhance supply
efficiency. The AUX driver recycles magnetizing cur-
rent instead of wasting it in a dissipative clamp circuit.
Programmable dead time between the AUX and main
driver allows for zero-voltage switching (ZVS). Under light-
load conditions, the devices reduce the switching fre-
quency (frequency foldback) to reduce switching losses.
The MAX5974A/MAX5974B feature unique circuitry to
achieve output regulation without using an optocoupler,
while the MAX5974C/MAX5974D utilize the traditional
optocoupler feedback method. An internal error amplifier
with a 1% reference is very useful in nonisolated design,
eliminating the need for an external shunt regulator.
The devices feature a unique feed-forward maximum
duty-cycle clamp that makes the maximum clamp volt-
age during transient conditions independent of the line
voltage, allowing the use of a power MOSFET with lower
breakdown voltage. The programmable frequency dither-
ing feature provides low-EMI, spread-spectrum operation.
The MAX5974_ are available in 16-pin TQFN-EP pack-
ages and are rated for operation over the -40°C to +85°C
temperature range.
Features
S Peak Current-Mode Control, Active-Clamped
Forward PWM Controller
S Regulation Without Optocoupler (MAX5974A/
MAX5974B)
S Internal 1% Error Amplifier
S 100kHz to 600kHz Programmable Q 8% Switching
Frequency, Synchronization Up to 1.2MHz
S Programmable Frequency Dithering for Low-EMI,
Spread-Spectrum Operation
S Programmable Dead Time, 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 Reverse Current Limit to Prevent Transformer
Saturation Due to Reverse Current
S Internal 18V Zener Clamp on Supply Input
S 3mm x 3mm, Lead-Free, 16-Pin TQFN-EP
Applications
PoE IEEE ? 802.3af/at Powered Devices
High-Power PD (Beyond the 802.3af/at Standard)
Active-Clamped Forward DC-DC Converters
IP Phones
Wireless Access Nodes
Security Cameras
Ordering Information/Selector Guide
PART
MAX5974A ETE+
MAX5974B ETE+
MAX5974C ETE+
MAX5974D ETE+
TOP MARK
+AHY
+AHZ
+AIA
+AIB
PIN-PACKAGE
16 TQFN-EP*
16 TQFN-EP*
16 TQFN-EP*
16 TQFN-EP*
UVLO THRESHOLD (V)
16
8.4
16
8.4
FEEDBACK MODE
Sample/Hold
Sample/Hold
Continuously Connected
Continuously Connected
Note: All devices are specified over the -40°C to +85°C operating temperature range.
+ 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.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5331; Rev 3; 10/13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5974AEVKIT# | 功能描述:电源管理IC开发工具 MAX5974A Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX5974BETE+ | 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 |
| MAX5974BETE+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 |
| MAX5974CETE+ | 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 |
| MAX5974CETE+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 |
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