標題: 請問有沒有穩壓管或LDO輸入5V-12V， 輸出5V的 [打印本頁] 作者: happy2058 時間: 2025-6-25 19:18 標題: 請問有沒有穩壓管或LDO輸入5V-12V， 輸出5V的 謝謝大家作者: xianfajushi 時間: 2025-6-25 22:31
TL431范圍很寬且有一定動態范圍作者: 名字不是重點 時間: 2025-6-25 23:13
進12V出5V太有了。。進5V出5V的貌似沒有。。。作者: Xuchuanqiu 時間: 2025-6-26 04:50
有。可調節就行作者: hailuoren 時間: 2025-6-26 09:33
這個范圍了直接DCDC唄作者: huangkk222 時間: 2025-6-26 14:18
可以加穩壓管12V穩5V Y要看電流是多大作者: rundstedt 時間: 2025-6-27 16:16
只能選LDO了，但LDO也是有壓降的。作者: SHYKH 時間: 2025-6-27 17:50
Yes, there are several voltage regulators and LDOs that can take an input range of 5V to 12V and output a stable 5V. The choice depends on your current requirements and how much efficiency or heat tolerance you need.
✅ Common Options:
🔹 1. Linear Regulators (e.g., 7805, AMS1117-5.0)
7805: Classic linear regulator, input up to 35V.
Easy to use, but inefficient—dissipates extra voltage as heat.
Good for low-power applications.
AMS1117-5.0: LDO with dropout ~1.1V.
Needs at least ~6.1V input to maintain stable 5V output.
Not suitable if your input drops to near 5V.
🔧 Note: Linear regulators get hot when stepping down from 12V to 5V at high current—add a heatsink if needed.
🔹 2. Switching Regulators (Buck Converters)
Much more efficient, especially if your input varies from 12V down to 5V.
Examples:
LM2596 (DC-DC buck module, very common)
MP1584, XL4015, TPS5430
Accept wide input (up to 30V depending on model), and maintain stable 5V output with high efficiency (80–90%).
✅ Great for powering microcontrollers, LED strips, sensors, etc.
🔹 3. LDO with Wide Input Support
If you need a proper LDO with better efficiency than a 7805:
LT1763, MIC29302, or LD1117 can be good choices depending on your current and dropout needs.
🔍 Recommendation:
If your input drops close to 5V, use a buck-boost converter or LDO with ultra-low dropout.
For most general use (like Arduino or Raspberry Pi), a buck converter is the most practical and efficient.
Let me know your specific current needs and whether efficiency or simplicity is more important—I’d be happy to recommend the best part number for your project!作者: weijoyer 時間: 2025-6-27 18:17
1117啊作者: coody_sz 時間: 2025-6-28 17:57
使用BUCK-BOOST電路，輸入2~12V，可以得到5V。作者: rayin 時間: 2025-6-30 07:20
即便是LDO也是有0.幾v的壓降. 5.0V進,5.0v出, LDO是做不到的.作者: 3637320230 時間: 2025-6-30 11:36
LM1117-5V