Hi guys,
I am using MAX761 to construct a regulator circuit from a solar power suuply. However, I found that the output capacitor is actually slowly discharging when no input is available. In fact, it is decreasing in voltage even with no load. I have isolated the problem to be an issue with the schottky diode 1N5817 recommended in the datasheet, the problem being that the capacitor seems to be dicharging from this diode. After I switched the diode to a diode chip, the drop in voltage across the output capacitor is reduced significantly. Can anyone tell me why this is so? The diode chip I substituted is actually a rectifier bridge DF04M, but it shouldn't be an issue. Has this drainage of charge from the capacitor got to do with the reverse characteristics of the diode? I read the datasheet for the 2 diodes but am not very sure what is mentioned in them, just that it seems that when the diode is in reverse-mode the current for the DF04M seems to be a lot less. Is this the reason why? The chip max761 is a switching regulator, so could this be reacting with the 1N5817 in generating the loss? Do note that the MAX761 in question is operating in non-bootstrapped mode. Ideas?
Thanks in advance!!
Cheers!!
Appleon
Note: I can't seem to be able to upload the datasheets, but the circuit I am building is exactly like that for non-bootstrapped mode for MAX761 in the datasheet.
I am using MAX761 to construct a regulator circuit from a solar power suuply. However, I found that the output capacitor is actually slowly discharging when no input is available. In fact, it is decreasing in voltage even with no load. I have isolated the problem to be an issue with the schottky diode 1N5817 recommended in the datasheet, the problem being that the capacitor seems to be dicharging from this diode. After I switched the diode to a diode chip, the drop in voltage across the output capacitor is reduced significantly. Can anyone tell me why this is so? The diode chip I substituted is actually a rectifier bridge DF04M, but it shouldn't be an issue. Has this drainage of charge from the capacitor got to do with the reverse characteristics of the diode? I read the datasheet for the 2 diodes but am not very sure what is mentioned in them, just that it seems that when the diode is in reverse-mode the current for the DF04M seems to be a lot less. Is this the reason why? The chip max761 is a switching regulator, so could this be reacting with the 1N5817 in generating the loss? Do note that the MAX761 in question is operating in non-bootstrapped mode. Ideas?
Thanks in advance!!
Cheers!!
Appleon
Note: I can't seem to be able to upload the datasheets, but the circuit I am building is exactly like that for non-bootstrapped mode for MAX761 in the datasheet.