Datasheet > MAX17498CATE

MAX17498CATE

更新时间： 2024-11-15 01:14:23

品牌	Logo	应用领域
美信 - MAXIM		/
页数	文件大小	规格书
20页	1201K
描述
AC-DC and DC-DC Peak Current-Mode Converters for Flyback/Boost Applicatio

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MAX17498CATE 数据手册

EVALUATION KIT AVAILABLE

MAX17498A/MAX17498B/MAX17498C

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

for Flyback/Boost Applications

General Description

Benefits and Features

The MAX17498A/MAX17498B/MAX17498C devices are

current-mode fixed-frequency flyback/boost converters

with a minimum number of external components. They

contain all the control circuitry required to design wide

input voltage isolated and nonisolated power supplies.

The MAX17498A has its rising/falling undervoltage lock-

out (UVLO) thresholds optimized for universal offline (85V

AC to 265V AC) applications, while the MAX17498B/

MAX17498C support UVLO thresholds suitable to low-

voltage DC-DC applications.

S Peak Current-Mode Converter

S Current-Mode Control Provides Excellent

Transient Response

S Fixed Switching Frequency

 250kHz: MAX17498A/MAX17498C

 500kHz: MAX17498B

S Flexible Error Amplifier to Regulate Both Positive

and Negative Outputs

S Programmable Soft-Start to Reduce Input Inrush

The switching frequency of the MAX17498A/MAX17498C

is 250kHz, while that of the MAX17498B is 500kHz. These

frequencies allow the use of tiny magnetic and filter com-

ponents, resulting in compact, cost-effective power sup-

plies. 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 imple-

mentation of an input overvoltage-protection scheme that

ensures that the converter shuts down when the DC input

voltage exceeds the desired maximum value.

Current

S Programmable Voltage or Current Soft-Start

S Power-Good Signal (PGOOD)

S Reduced Power Dissipation Under Fault

 Overcurrent Protection

 Thermal Shutdown with Hysteresis

S Robust Protection Features

 Programmable Current Limit

 Input Overvoltage Protection

The devices incorporate a flexible error amplifier and an

accurate reference voltage (REF) to enable the end user to

regulate both positive and negative outputs. Programmable

currentlimitallowspropersizingandprotectionoftheprimary

switching FET. The devices support a maximum duty cycle

greater than 92% and provide programmable slope com-

pensation to allow optimization of control loop performance.

The devices provide an open-drain PGOOD pin that serves

as a power-good indicator and enters the high-impedance

state to indicate that the flyback/boost converter is in regu-

lation. An SS pin allows programmable soft-start time for the

flyback/boost converter. 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.

S Optimized Loop Performance

 Programmable Slope Compensation

S High Efficiency

 Low R

, 175mI, 65V Rated Internal

DSON

n-Channel MOSFET

 No Current-Sense Resistor

S Optional Spread Spectrum

S Space-Saving, 16-Pin (3mm x 3mm) TQFN

Package

Applications

Front-End AC-DC Power Supplies for Industrial

Applications (Isolated and Nonisolated)

Ordering Information and Typical Application Circuits

appear at end of data sheet.

Telecom Power Supplies

Wide Input Range DC Input Flyback/Boost

Industrial Power Supplies

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

refer to www.maximintegrated.com/MAX17498A.related.

For pricing, delivery, and ordering information, please contact Maxim Direct at

1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

19-6043; Rev 3; 4/13

12 3 4 5 6 7...20

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