LED power supply is generally a constant current source, according to the need, not to change the output voltage, but to change the output current.
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2, LED power supply used in the power chip (6-pin, or 8-pin) near, generally have 1, 2 ohMs resistance, change the resistance value, you can change the output current.
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3, change the output current, you can change the output voltage.
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4, note: Because the LED increases with the temperature, the voltage drop will decrease, so even if the output current is constant, the output voltage will change.
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5, when the capacitor is in the board, the initial power, the process of charging the capacitor, more or less limits the rise speed of the abnormal no-load voltage.
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6, the no-load output voltage is abnormal, does not mean that it can not be used (in addition to chip self-protection). When you connect the lamp board, the output voltage is determined by the working voltage of the lamp board, if the power is connected under the premise of the original design lamp board, even if you remove the capacitor, the resistance will not burn.
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7, even if it can be used, but there will always be no load, if you have the ability, or change it to normal. Otherwise, in the case of virtual contact in the circuit, abnormally high no-load voltage is more likely to breakdown and damage the lamp bead.
To adjust the output current and voltage of the LED driver, you can take the following steps:
1. Understand the technical parameters of the driver, including current output range, voltage output range, and output power.
2. Adjust the output current or voltage as needed, which can be achieved by changing the resistance, adjusting the potentiometer, replacing the integrated circuit, etc.
3. Pay attention to safety during adjustment to avoid equipment damage or safety problems caused by excessive adjustment.
4. It is best to refer to the driver's instruction manual or consult the manufacturer's technical support to ensure that the adjustment is correct and does not affect product quality.
To adjust the switch chip feedback resistance, voltage adjustment should be in a limited range