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Old 25th August 2012, 08:09 PM   #1711
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I am doing my first SSLV. Need 5v, 150mA load. I have 1k trimmer. Do I need 1 or 2 Leds? R303 jumper or 220R?
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Old 25th August 2012, 08:13 PM   #1712
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Have you read the guide?

Is for digital or analog?
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Old 25th August 2012, 08:16 PM   #1713
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5V Vout Mosfet reg. 2 1.9V LED, 220 Ohm R303. Other parts jumper.

There is in 1st post a calculator to calculate the current, always is better x 2 or x 3, in your case 300 or 450mA
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Old 25th August 2012, 10:18 PM   #1714
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I am using bjt. No 220r correct? 2 led rest jumpered. I am getting 2v across 20Ohm dummy no change using trimmer.

Last edited by wushuliu; 25th August 2012 at 10:20 PM.
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Old 26th August 2012, 12:36 AM   #1715
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You need the 220R or a simple diode in series with the LEDs. You need to jumper the non used positions to close the series Vref circuit. Use a 33R dummy to simulate 150mA load. Set CCS for 200mA minimum. Your now dummy asks for 250mA you are possibly chocking your CCS setting. Find your CCS current by measuring voltage drop across your setting resistor and dividing by its value.
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Old 26th August 2012, 02:28 AM   #1716
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Ah, thank you. I was indeed choking the current.Ok so I have BJT, 1k trimmer, 220R and 2Leds. I am getting 300mA w/ 4R 12w and 5.21v out. with trimmer turned all the way. How do I reduce to 5v proper?
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Old 26th August 2012, 03:15 AM   #1717
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Never mind. Figured it out. Thanks again Salas.
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Old 26th August 2012, 03:27 AM   #1718
Salas is offline Salas  Greece
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What is it built for?
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Old 26th August 2012, 03:44 AM   #1719
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Odac...
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Old 26th August 2012, 12:08 PM   #1720
qusp is offline qusp  Australia
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haha an interesting mix, the designer must think you very foolish when surely USB power is good enough… hehe
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