I'm using the following "inexpensive power suppy module" to provide variable DC voltage of approx 1.75-2.25 VDC to a short length of nichrome heating wire with a cold resistance of 4ohms. It draws about 1/2 amp (ohms law), well within the operating range of the module.
I have a 6V 2.5 amp "wall wart" supplying power to the module.
PROBLEM: The 2596s chip in the module gets extremely hot and shuts downor goes unstable. Is this variable DC module suitable for the application, and if not then what is the best way to supply 1.75 - 2.25 VDC to the heating element?? Cost is not really an issue. It has to be powered by an AC-DC wall wart.
Any help or comments greatly appreciated.
Thanks,
Steve
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POWER SUPPLY MODULE SPECS:
LM2596S DC-DC Step Down Adjustable Power Supply Module
1. Input voltage: 3.2-40V
2. Output Voltage: 1.5-35V (adjustable) ,input must least high 1.5V than output
3. Output current: rated current 2A, maximum 3A (need to add heat sink), if the output power greater than 15W, combined heat sink is proposed.
4. Conversion efficiency: Up to 92% (output voltage higher, the higher the efficiency)
5. Minimum dropdown voltage:1.5V
6.Voltage regulation: ± 0.5%
7. Dynamic response speed: 5% 200uS
8. circuit protection: SS36
9. Operating temperature: Industrial grade (-40 ℃ to +85 ℃) (output power 10W or less)
10. Load regulation: ± 0.5%
I have a 6V 2.5 amp "wall wart" supplying power to the module.
PROBLEM: The 2596s chip in the module gets extremely hot and shuts downor goes unstable. Is this variable DC module suitable for the application, and if not then what is the best way to supply 1.75 - 2.25 VDC to the heating element?? Cost is not really an issue. It has to be powered by an AC-DC wall wart.
Any help or comments greatly appreciated.
Thanks,
Steve
---------------------
POWER SUPPLY MODULE SPECS:
LM2596S DC-DC Step Down Adjustable Power Supply Module
1. Input voltage: 3.2-40V
2. Output Voltage: 1.5-35V (adjustable) ,input must least high 1.5V than output
3. Output current: rated current 2A, maximum 3A (need to add heat sink), if the output power greater than 15W, combined heat sink is proposed.
4. Conversion efficiency: Up to 92% (output voltage higher, the higher the efficiency)
5. Minimum dropdown voltage:1.5V
6.Voltage regulation: ± 0.5%
7. Dynamic response speed: 5% 200uS
8. circuit protection: SS36
9. Operating temperature: Industrial grade (-40 ℃ to +85 ℃) (output power 10W or less)
10. Load regulation: ± 0.5%