 |
|
|
 |
|
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
| Power & Power ICs |
| Product Review |
 | Archives | Feedback |
110V, Current-Mode PWM Controllers Integrate A High-Voltage Startup FET In An 8-pin SO
manufacturer says... |
Nasser Kutkut, Ph.D., says... |
|
Maxim Integrated Products introduces the MAX5014/MAX5015 PWM controllers designed for compact, high-performance, isolated power supplies for telecom and networking equipment. The MAX5014/MAX5015 operate from a wide 12V to 110V input voltage range and include a high-voltage preregulator for startup. After startup, however, device power is derived from a low-voltage tertiary winding from the transformer. The MAX5014 operates at an 85% maximum duty cycle and is recommended for isolated flyback converters up to 20W output power. The MAX5015 operates at a 50% maximum duty cycle and is recommended for forward-mode converters up to 60W output power. Other controller features include current-mode control, leading-edge blanking, shutdown, soft-start, overcurrent shutdown, undervoltage lockout, and thermal shutdown. Oscillator frequency is internally trimmed to 275kHz, which allows use of all surface-mount components. To speed designs, a fully tested 50W isolated power-supply evaluation kit is available in the standard half-brick module footprint and pin-out. The MAX5014 evaluation kit operates from the telecom (32V to 72V) input voltage range. Both the MAX5014/MAX5015 are available in an 8-pin SO package and are rated for operation over the extended industrial temperature range (-40ºC to +85ºC). Prices start at $0.75 (1000-up, FOB USA). |
When it comes to selecting a current mode controller for your power supply design, the selections seem top be endless. Most power semiconductor device and IC manufacturers offer one or more version of PWM current mode power supply controllers. However, your task doesnęt end by selecting the controller. You need to worry about starting the converter and providing startup power to your controller. A tertiary winding off your main transformer can be used to get continuous control power afterwards. Conventionally, this can be achieved by utilizing discrete components to get the kick-start power or dedicated linear regulators. Not anymore. The new current mode controller from Maxim integrates a high voltage pre-regulator into the chip for startup power. The new MAX5014/MAX5015 operate over a wide input voltage range from 12-110V and features various safety and protection circuitry consistent with their conventional counterparts. The new controllers will save you the additional components that you would otherwise use for startup power, thus reducing cost and real estate. |
 | ||||
 |
|
Click here to get your listing up.
|
|
|
| ||||
Copyright © 2003 ChipCenter-QuestLink
About ChipCenter-Questlink
Contact Us
Privacy Statement
Advertising Information
FAQ
