寻找DC-DC方案芯片

寻找19V输入+12v输出3A,+5v输出3A,+3.3v输出3A,-12v输出3A,希望大家多提供信息啊,谢谢!!

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LV.5

2008-08-11 16:52

三款芯片  我先上下参数

GT1500

3.3V, 5V, 12V and adjustable output versions
Adjustable version output voltage range, 1.23V to
28V +4% max over line and load condiction
Available in TO220-5L and TO263-5L packages
Voltage mode non-synchronous PWM control
Thermal-shutdown and current-limit protection
ON/OFF shutdown control input
Input voltage range up to 32V
Output load current: 3A
150 kHz fixed frequency internal oscillator
Low power standby mode
Built-in switching transistor on chip

GT1510

Input voltage:3.6V to 24V
Adjustable output voltage range :0.8V to VCC
Duty ratio:0%to 100%PWM control
Oscillation frequency:320KHz typ.
Soft-start, Current limit,Enable function
Thermal Shutdown function
Bulit-in internal 60mΩ P-channel DMOS
Up to 95%Efficiency
Output load current: 3A
SOP-8L Pb-Free Package
Low power standby mode

前两款是集成方案,下面这款是分立方案
PWM IC

GT1512

Input voltage:3.6V to 24V
Adjustable output voltage range :0.8V to VIN
Duty ratio:0% to 100% PWM control
Oscillation frequency:320KHz typ.
Soft-start, Current limit function
Thermal Shutdown function
+/-1.3%(+/- 2% over temp) internal reference.
Up to 95% Efficiency
Dedicated enable pin.
SOP-8L Pb-Free Package
Low power standby mode(<5uA)

如需样片和相应规格DEMO测试效率  请联系

paul343400@163.com 15989361319 QQ:278422596 (注明DC-DC)

tanknet

LV.7

2008-08-12 02:31

现在怎么突然这么多人做电脑电源呢

这个要求应该用高频buck实现效率最高,-12V用反压,一共需要用4个分立电感、4个MOSFET(或8个,同步整流,最大输出时同步整流可以省约5W功率)

此外如果你的工艺偏好磁集成,也可以全部反激,可以把所有磁性元件集成到一个铁硅铝一类的磁环上.一个磁环变压器1个mosfet(或5个,次级做同步整流)