| ??? 02/22/03 20:49 Read: times |
#39787 - RE: Linear Power and Temperature Responding to: ???'s previous message |
Scott P. Dolan wrote:
------------------------------- I am using a National.com LM1086IS-5.0V power supply. My main probably is when the input voltage increase to 15V the LM1086 get too hot to touch. My goal is to figure out how much copper area the power supply needs to run cool to human touch approx. 30c. My Voltage ranges from 6.5v - 15V My Supply current is 2-3A My Output Voltage is 5V My cirucit consume 500mA My Max Ambient Temperature 70 c How do you have 2-3A input and 500mA output ! Your ambient spec is very tough. We usually allow only a 60C internal maximum. Do you have ANY heatsink ? Roughly, you are asking to dissipate a maximum of 5W in the heatsink. Now buy a heatsink with a low enough thermal resistance, that when it is dissipating 5W, the inside of your device doesn't exceed 150 C. You need to know the junction-heatsink thermal resistance for a start. Steve |
| Topic | Author | Date |
| Linear Power and Temperature | 01/01/70 00:00 | |
| RE: Linear Power and Temperature | 01/01/70 00:00 | |
| Re: Steve | 01/01/70 00:00 | |
| Re: Steve | 01/01/70 00:00 | |
| Re: Steve | 01/01/70 00:00 | |
| Re: Steve | 01/01/70 00:00 | |
| Re: Steve | 01/01/70 00:00 | |
| Re: Steve | 01/01/70 00:00 | |
| Re: Steve | 01/01/70 00:00 | |
| Ending | 01/01/70 00:00 | |
| RE: Ending | 01/01/70 00:00 | |
| RE: Linear Power and Temperature | 01/01/70 00:00 | |
| RE: Linear Power and Temperature | 01/01/70 00:00 | |
| RE: Linear Power and Temperature | 01/01/70 00:00 | |
| RE: Linear Power and Temperature | 01/01/70 00:00 | |
RE: Linear Power and Temperature | 01/01/70 00:00 | |
| Dropout Voltage Mean | 01/01/70 00:00 | |
| RE: Dropout Voltage Mean | 01/01/70 00:00 | |
| Input Range | 01/01/70 00:00 |