Datasheet > MAX17497A_12

MAX17497A_12

更新时间： 2024-11-14 12:23:39

品牌	Logo	应用领域
美信 - MAXIM		转换器稳压器
页数	文件大小	规格书
30页	3936K
描述
AC-DC and DC-DC Peak-Current-Mode Converters with Integrated Step-Down Regulator

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MAX17497A_12 数据手册

19-5981; Rev 1; 1/12

E V A L U A T I O N K I T A V A I L A B L E

MAX17497A/MAX17497B

AC-DC and DC-DC Peak-Current-Mode Converters

with Integrated Step-Down Regulator

General Description

Benefits and Features

The MAX17497A/MAX17497B include both a current-

mode fixed-frequency PWM converter and a synchro-

nous step-down regulator. They contain all the control

circuitry required to design wide-input-voltage noniso-

lated power supplies to supply multiple output rails for

smart meters, industrial control, and other similar applica-

tions. The MAX17497A has its rising/falling undervoltage

lockout (UVLO) thresholds optimized for universal offline

(85V AC to 265V AC) applications, while the MAX17497B

supports undervoltage lockout (UVLO) thresholds suit-

able to low-voltage DC-DC applications. Both devices

also include a 3.3V fixed-output synchronous step-down

regulator that delivers up to 600mA load current.

S Reduced Component Count and Board Space

 Flyback/Boost with Integrated Internally

Compensated Step-Down Regulator

 No Current-Sense Resistor

 Space-Saving 16-Pin (3mm x 3mm) TQFN

Package

S Minimal Radio Interference

 250kHz Switching in Offline Version

Minimizes Interference with Radio Receivers

in Smart Meter Applications

S Reduced Inrush Current

 Programmable Flyback/Boost Soft-Start

 Internal Digital Soft-Start for Step-Down

The switching frequency of the MAX17497A flyback

converter is 250kHz, while the MAX17497B flyback/

boost converter is 500kHz. The internally compensated

synchronous step-down regulator switches at 1MHz on

both versions. These frequencies allow the use of tiny

magnetic and filter components resulting in compact,

cost-effective power supplies. An EN/UVLO input allows

the user to start the power supply precisely at the desired

input voltage, while also functioning as an on/off pin. The

OVI pin enables implementation of an input overvoltage-

protection scheme that ensures the converter shuts

down when the DC input voltage exceeds the desired

maximum value.

Regulator

S Reduced Power Dissipation Under Fault

 Hiccup Mode Overcurrent Protection

 Thermal Shutdown with Hysteresis

S Robust Protection Features

 Flyback/Boost Programmable Current Limit

 Input Overvoltage Protection

S Optimized Loop Performance

 Programmable Slope Compensation for

Flyback/Boost Maximizes Obtainable Phase

Margin

S High Efficiency

Programmable current limit allows proper sizing and

protection of the primary switching FET. The MAX17497B

supports a maximum duty cycle of 93% and provides

programmable slope compensation to allow optimization

of control loop performance. The MAX17497A supports

a maximum duty cycle of 49%, and has a fixed internal

slope compensation for optimum control loop perfor-

mance. The devices provide an open-drain RESETN pin

that serves as a power-good indicator and enters the

high-impedance state to indicate that the flyback/boost

converter and 3.3V step-down regulator outputs are in

regulation. An SSF pin allows programmable soft-start

time for the flyback/boost converter, while an internal

digital soft-start is employed for the 3.3V step-down regu-

lator to limit inrush current. Hiccup mode overcurrent pro-

tection and thermal shutdown are provided to minimize

dissipation under overcurrent and overtemperature fault

conditions. The devices are available in a space-saving

16-pin (3mm x 3mm) TQFN package with 0.5mm lead

spacing.

 150mI, 65V-Rated nMOSFET Offers Typical

Flyback Converter Efficiency Greater Than

80%

 3.3V Step-Down Regulator Efficiency Greater

Than 90%

S Optional Spread Spectrum

Applications

AC-DC Power Supplies for Smart Meter

Applications

Universal-Input Offline AC-DC Power Supplies

Wide-Range DC Input Flyback/Boost Industrial

Power Supplies

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part,

refer to www.maxim-ic.com/MAX17497A.related.

ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ Maxim Integrated Products

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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与MAX17497A_12相关器件

型号	品牌	获取价格	描述	数据表
MAX17497A_13	MAXIM	获取价格	AC-DC and DC-DC Peak Current-Mode Converters with Integrated Step-Down Regulator
MAX17497AATE+	MAXIM	获取价格	AC-DC and DC-DC Peak-Current-Mode Converters with Integrated Step-Down Regulator
MAX17497B	MAXIM	获取价格	AC-DC and DC-DC Peak-Current-Mode Converters with Integrated Step-Down Regulator
MAX17497BATE+	MAXIM	获取价格	AC-DC and DC-DC Peak-Current-Mode Converters with Integrated Step-Down Regulator
MAX17498A	MAXIM	获取价格	AC-DC and DC-DC Peak-Current-Mode Converters for Flyback/Boost Applications
MAX17498A_13	MAXIM	获取价格	AC-DC and DC-DC Peak Current-Mode Converters for Flyback/Boost Applications
MAX17498AATE	MAXIM	获取价格	AC-DC and DC-DC Peak Current-Mode Converters for Flyback/Boost Applicatio
MAX17498B	MAXIM	获取价格	AC-DC and DC-DC Peak-Current-Mode Converters for Flyback/Boost Applications
MAX17498B	ADI	获取价格	AC-DC和DC-DC峰值电流模式转换器，支持反激/Boost应用
MAX17498BATE	MAXIM	获取价格	AC-DC and DC-DC Peak Current-Mode Converters for Flyback/Boost Applicatio

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