MAX17691B

4.2V–60V、无光耦、隔离反激转换器，集成FET

将方案尺寸和元件数量缩减30%

产品详情

General Description

Maxim's Rainier family of isolated power devices enable cooler, smaller, and simpler power-supply solutions. The MAX17691A/B is a high efficiency no-opto integrated nMOSFET flyback converter that uses fixed frequency peak current mode control. The device senses the isolated output voltage directly from the primary-side flyback waveform during secondary-side rectifier conduction. No secondary-side error amplifier and optocoupler are required to provide an accurate, isolated, regulated output voltage, saving up to 20% of PCB space normally required for a traditional flyback converter.

The MAX17691A/B features a low R_DSON, 76V, 170mΩ integrated nMOSFET primary switch and is designed to operate over a wide supply range from 4.2V to 60V. The switching frequency of the device is programmable from 100kHz to 350kHz. An EN/UVLO feature allows the user to turn ON/OFF the power converter precisely at the desired input voltage. Input overvoltage protection can be implemented using the OVI pin (MAX17691A only). Soft-start limits inrush current at startup. The MAX17691A/B supports external clock synchronization to avoid low-frequency “beats” on the input bus in systems with multiple converters. The device also has programmable frequency dithering for low-EMI, spread-spectrum operation.

The MAX17691A/B allows temperature compensation for variations in the output rectifier diode forward voltage drop. The MAX17691A is internally compensated for loop stability, while the MAX17691B offers external loop compensation flexibility. The MAX17691A/B has robust hiccup-protection and thermal protection schemes, and is available in a space-saving 12-pin, 3mm x 3mm TDFN package with a temperature range from -40°C to +125°C.

Typical Application Circuit

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Benefits and Features

Reduces External Components and Total Cost
- Eliminates the Optocoupler and Secondary-Side Error Amplifier
- Up to 20% Space Savings
- 76V, Low R_DSON Integrated nMOSFET
- Internal Loop Compensation (MAX17691A)
- Built-In Soft-Start
Reduces Power Dissipation
- > 90% Efficiency
- Delivers up to 7.5W Output Power
- Frequency Fold-Back Enables Enhanced Light-Load Efficiency
- 2.5µA Shutdown Current
Supports Key System-Level Design Requirements
- Frequency Dithering Supports Low-EMI, Spread-Spectrum Operation
- Switching Frequency Synchronization to External Clock
- Compliant with CISPR22 ClassB EMI Requirements
Operates Reliably in Adverse Environments
- Output Diode Forward Voltage Temperature Compensation
- Hiccup Current-Limit Protection
- Programmable EN/UVLO Threshold
- Input Overvoltage (OVI) Protection (MAX17691A)
- Overtemperature Protection
- High Industrial -40°C to +125°C Ambient Operating Temperature Range/ -40°C to +150°C Junction Temperature Range

Applications

Isolated Power Supplies
PLC I/O Modules
IGBT Gate Drive Supplies
Industrial and Telecom Applications

19-100784; Rev 0; 9/20

请参见参数规范 Isolated Power Supplies

主要特征

应用/用途

请参见参数规范 Isolated Power Supplies

Parametric specs for Isolated Power Supplies

V_IN (V) (min)	4.2
V_IN (V) (max)	60
Topology	Flyback
Application (V_IN)	Base Station (24V) Industrial (24V) Networking (48V) Power Over Ethernet (32-58V)
Switch Type	Internal
Feedback	Primary Side
Switching Frequency (kHz)	100-300
Oper. Temp. (°C)	-40 to +125
Package/Pins	TDFN-CU/12
Budgetary Price (See Notes)	1.59

比较产品库中的器件

请参见参数规范 Isolated Power Supplies

简化框图

技术文档

数据资料

4.2V–60V、无光耦、隔离反激转换器，集成FET

Mar 23, 2021

设计与质量

单击下面的标题以查看详情页面

硬件开发

评估板

MAX17691AEVKIT

数据资料

$29.73

描述

MAX17691A评估套件(EV kit)提供经过验证的设计，用于评估MAX17691A IC的功能及性能。完全装配并经过测试的电路板采用了MAX17691A无光耦、反激转换器，该器件内部集成功率FET，采用12引脚TDFN封装，带有裸焊盘。IC数据手册提供完整的器件使用说明，在操作评估板之前应仔细阅读评估套件及器件的数据手册。

MAX17691A评估套件配置为+5V隔离输出，在18V至36V输入电压范围内提供高达1.5A输出电流。器件开关频率为150kHz。在整个电源、负载及温度范围内，通过监测副边输出电压，评估套件可将输出电压稳定在±5%范围之内。转换器无需光耦即可实现隔离侧输出电压检测。

查看详情

特征

18V至36V输入范围
隔离输出：5V/1.5A DC
小尺寸设计、高开关频率(150kHz)
峰值效率为86%
可通过电阻设置输入使能/UVLO保护门限
电阻可编程输入过压保护门限
内部环路补偿减少外部元件
5ms内部软启动时间
温度补偿输出电压，工作在-40°C至+125°C温度范围
提供外部时钟同步和频率加抖功能
V_CC过驱动
最少的外部元件数量
符合CISPR22(EN55022) Class B辐射要求
经过验证的PCB布局
完全装配并经过测试

评估板

MAX17691BEVKIT

数据资料

$29.73

描述

The MAX17691B evaluation kit (EV kit) provides a proven design to evaluate the performance of the MAX17691B IC. This fully assembled and tested circuit evaluates the MAX17691B, the No-Opto Flyback Converter with an integrated 76V nMOSFET, available in a 12-pin TDFN package with an exposed pad. The IC data sheet provides a complete description of the part and should be read in conjunction with this EV kit data sheet prior to operating the EV kit.

The MAX17691B EV kit output is configured for an isolated +5V and provides up to 1.5A of output current over an 18V to 36V input range. The device has a 150kHz switching frequency. The EV kit regulates the output voltage within ±5% over the line, load, and temperature by sensing the output voltage on the primary side. The converter does not need an opto-coupler for the isolated output-voltage sensing.

查看详情

特征

18V to 36V Input Range
Isolated Output: 5V/1.5A DC
Compact Design with High Frequency (150kHz) Switching
87% Peak Efficiency
Resistor Programmable Input Enable/UVLO Protection
External Loop Compensation with Design Flexibility
5ms Internal Soft-Start Time
Temperature Compensated Output Voltage Over -40°C to +125°C Operating Temperature
Provision to External Clock Synchronization and Frequency Dithering
V_CC Overdrive to Improve Efficiency
Minimum Number of External Components
CISPR22(EN55022) Class B Compliant
Proven PCB Layout
Fully Assembled and Tested

评估板

MAX17691AEVKIT

数据资料

$29.73

描述

查看详情

特征

18V至36V输入范围
隔离输出：5V/1.5A DC
小尺寸设计、高开关频率(150kHz)
峰值效率为86%
可通过电阻设置输入使能/UVLO保护门限
电阻可编程输入过压保护门限
内部环路补偿减少外部元件
5ms内部软启动时间
温度补偿输出电压，工作在-40°C至+125°C温度范围
提供外部时钟同步和频率加抖功能
V_CC过驱动
最少的外部元件数量
符合CISPR22(EN55022) Class B辐射要求
经过验证的PCB布局
完全装配并经过测试

评估板

MAX17691BEVKIT

数据资料

$29.73

描述

查看详情

特征

18V to 36V Input Range
Isolated Output: 5V/1.5A DC
Compact Design with High Frequency (150kHz) Switching
87% Peak Efficiency
Resistor Programmable Input Enable/UVLO Protection
External Loop Compensation with Design Flexibility
5ms Internal Soft-Start Time
Temperature Compensated Output Voltage Over -40°C to +125°C Operating Temperature
Provision to External Clock Synchronization and Frequency Dithering
V_CC Overdrive to Improve Efficiency
Minimum Number of External Components
CISPR22(EN55022) Class B Compliant
Proven PCB Layout
Fully Assembled and Tested

工具和模型

EE-Sim: 设计和仿真MAX17691B

创建设计

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题，请访问Maxim的支持中心。

参量

Parametric specs for Isolated Power Supplies

V_IN (V) (min)	4.2
V_IN (V) (max)	60
Topology	Flyback
Application (V_IN)	Base Station (24V) Industrial (24V) Networking (48V) Power Over Ethernet (32-58V)
Switch Type	Internal
Feedback	Primary Side
Switching Frequency (kHz)	100-300
Oper. Temp. (°C)	-40 to +125
Package/Pins	TDFN-CU/12
Budgetary Price (See Notes)	1.59

Compare products in Family

See parametric specs for Isolated Power Supplies

主要特征

减少外部元件，降低总体成本
- 无需光耦和副边误差放大器
- 节省高达20%的空间
- 集成76V、低R_DS(ON)nMOSFET
- 内部环路补偿(MAX17691A)
- 内置软启动
降低功耗
- 效率> 90%
- 提供高达7.5W输出功率
- 频率折返提高轻载效率
- 2.5µA关断电流
可满足系统级的关键设计要求
- 频率加抖支持扩频操作，有助于降低EMI
- 可同步开关频率
- 满足CISPR22 ClassB EMI要求
在恶劣环境下可靠工作
- 提供输出电压温度补偿选项
- 打嗝式限流保护
- 可编程EN/UVLO门限
- 输入过压(OVI)保护(MAX17691A)
- 热保护
- -40°C至+125°C高温工业级环境温度范围/-40°C至+150°C结温范围

应用/用途

隔离电源
PLC I/O模块
IGBT栅极驱动电源
工业和电信应用

描述

Maxim的Rainier隔离电源系列产品提供温升更低、体积更小、更简单的电源设计方案。

MAX17691A/B为高效、无光耦、集成nMOSFET反激转换器，采用固定频率、峰值电流控制模式。器件在内部nMOSFET关断期间直接从原边反激波形检测隔离输出电压，无需副边误差放大器和光耦即可提供高精度的稳压隔离输出，比传统反激转换器所要求的PCB面积节省20%。

MAX17691A/B内部集成了低R_DS(ON)、76V、170mΩ nMOSFET原边开关，设计工作在4.2V至60V较宽的电源电压范围。器件开关频率可在100kHz至350kHz范围内调节。EN/UVLO功能允许用户在所要求的输入电压下准确打开/关闭电源转换器。可通过OVI引脚提供输入过压保护(仅限MAX17691A)。软启动功能限制启动时的浪涌电流。MAX17691A/B支持外部时钟同步，在多转换器工作的系统中可以避免输入电源总线上的低频“差拍干扰”。器件还提供可编程频率加抖功能，实现低EMI、扩频操作。

MAX17691A/B允许对输出整流二极管正向压降的变化进行温度补偿。MAX17691A具有内部补偿，提高环路稳定性；MAX17691B提供外部环路补偿，提高设计灵活性。MAX17691A/B拥有可靠的打嗝式保护和热保护机制，采用节省空间的12引脚、3mm x 3mm TDFN封装，工作在-40°C至+125°C温度范围。

简化框图

MAX17691A, MAX17691B: Typical Application Circuit

技术文档

数据资料

4.2V–60V、无光耦、隔离反激转换器，集成FET

Mar 23, 2021

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题，请访问Maxim的支持中心。

INTERACTIVE Data Sheet

MAX17691B

4.2V–60V、无光耦、隔离反激转换器，集成FET

产品详情

主要特征

应用/用途

简化框图

技术文档

设计与质量

EE-Sim: 设计和仿真MAX17691B

EE-Sim: 设计和仿真MAX17691B

支持和培训

参量

主要特征

应用/用途

描述

简化框图

技术文档

支持和培训

MAX17691B 相关视频