19-6043; Rev 1; 3/12
E V A L U A T I O N K I T A V A I L A B L E
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 Flyback/Boost 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
flyback converters is 250kHz, while that of the MAX17498B
flyback/boost converter is 500kHz. 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 function-
ing as an on/off pin. The OVI pin enables implementation
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
Hiccup-Mode Overcurrent Protection
Thermal Shutdown with Hysteresis
S Robust Protection Features
Flyback/Boost 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
current limit allows proper sizing and protection of the
primary switching FET. The MAX17498B supports a maxi-
mum duty cycle of 92% and provides programmable
slope compensation to allow optimization of control-loop
performance. The MAX17498A/MAX17498C support a
maximum duty cycle of 49%, and have fixed internal slope
compensation for optimum 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 regula-
tion. 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 for
Flyback/Boost Maximizes Obtainable Phase
Margin
S High Efficiency
175mI, 65V Rated n-Channel MOSFET Offers
Typical Efficiency Greater Than 80%
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)
Telecom Power Supplies
Wide Input Range DC Input Flyback/Boost
Industrial Power Supplies
Ordering Information appears at end of data sheet.
Typical Application Circuits appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX17498A.related.
ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ 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.
5秒后页面跳转
解析光耦仿真器：升级光耦合器技术的必要性
英伟达新一代Blackwell GPU过热问题致交付延迟
国产厂商思特威CMOS图像传感器芯片单月出货超1亿颗，技术创新引领行业发展
台积电5nm和3nm产能利用率达100%，半导体行业景气度持续攀升
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
