基于TOP265EG設(shè)計(jì)的30W待機(jī)電源方案
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時(shí)間：2010-06-09
來(lái)源：網(wǎng)絡(luò)
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技術(shù)方案與實(shí)用技巧
TOPSwitch-JX TOP264-271 cost effectively incorporates a 725 V power MOSFET, high voltage switched current source, multi-mode PWM control, oscillator, thermal shutdown circuit, fault protection and other control circuitry onto a monolithic device.
TOPSwitch-JX 系列主要特性:
EcoSmart® - Energy Efficient
Energy efficient over entire load range
No-load consumption below 100 mW at 265 VAC
Up to 750 mW standby output power for 1 W input at 230 VAC
High Design Flexibility for Low System Cost
Multi-mode PWM control maximizes efficiency at all loads
132 kHz operation reduces transformer and power supply size
66 kHz option for highest efficiency requirements
Accurate programmable current limit
Optimized line feed-forward for line ripple rejection
Frequency jittering reduces EMI filter cost
Fully integrated soft-start for minimum startup stress
725 V rated MOSFET
Simplifies meeting design derating requirements
Extensive Protection Features
Auto-restart limits power delivery to 3% during overload faults
Output short-circuit protection (SCP)
Output over-current protection (OCP)
Output overload protection (OPP)
Output overvoltage protection (OVP)
User programmable for hysteretic/latching shutdown
Simple fast AC reset
Primary or secondary sensed
Line undervoltage (UV) detection prevents turn-off glitches
Line overvoltage (OV) shutdown extends line surge withstand
Accurate thermal shutdown with large hysteresis (OTP)
Heat transfer to both PCB and heat sink
Optional external heat sink provides thermal impedance equivalent to a TO-220
eSIP®-7C package:
Vertical orientation for minimum PCB footprint
Simple heat sink mounting using clip provides thermal impedance equivalent to a TO-220
Extended creepage to DRAIN pin
Heat sink is connected to SOURCE for low EMI
圖1.TOPSwitch-JX系列功能方框圖(E 和V 封裝).
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