基于TOP265EG设计的30W待机电源方案
TOPSwitch-JX系列(TOP264-271)集成了725V功率MOSFET,高压开关电流源,多模式PWM控制,热关断电路,故障保护和其它控制电路, 265 VAC电压下无负载的功耗低于100mW.本文介绍了TOPSwitch-JX系列(TOP264-271)主要特性, 方框图, 通用输入高效19V 65W反激电源电路图和采用TOP265EG的12V 30W高效待机电源设计案例的电路图和所用材料清单.
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
图1.TOPSwitch-JX系列功能方框图(E 和V 封装).
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
图1.TOPSwitch-JX系列功能方框图(E 和V 封装).
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