Dear Sir,
Is it possible to use one LTC3490 to driver LEDs in 3 parallel 3 series LED/ total LED current is 60mA?
(I use LTSpice to simulation is ok, but customer test in PCBA circuit is failure)
Thanks.
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LT3591
Production
The LT3591 is a fixed frequency step-up DC/DC converter speciï¬cally designed to drive up to ten white LEDs in series from a Li-Ion cell. Series connection...
Datasheet
LT3591 on Analog.com
LTC3490
Production
The LTC3490 provides a constant current drive for 1W LED applications. It is a high efficiency boost converter that operates from 1 or 2 NiMH or alkaline...
Datasheet
LTC3490 on Analog.com
Dear Sir,
Is it possible to use one LTC3490 to driver LEDs in 3 parallel 3 series LED/ total LED current is 60mA?
(I use LTSpice to simulation is ok, but customer test in PCBA circuit is failure)
Thanks.
Hi
Do you know what is the part number of the LED's being driven ?
Regards
Dear Mikee,
LED part number: 01. JT.CB426WS ,


VIn:5V, Vo: 16.5V~19.2V(LED: 3S3P), Io: 60mA
Thanks.
Dear Mikee,
The LED part number is "01. JT.CB426WS", Vf:6V, If: 20mA
Vin: 2.5V~4.6V
Thanks.
Hi
LTC3490 would not be able to handle the configuration as it is limited to 4V
LTC3491 should be able to handle the requirements.
Can you provide wave forms on the SW, VIn, Cap and LED nodes ?
For the mean time, please check the connections on the board and the orientation of the inductor in the circuit
Regards
Dear Mikee,
If LTC3491 Vin voltage is 5V, is it should be able to handle the requirements?
Thanks.
Hi
Rough computation for the Pk inductor current with the given conditions using LTC3491 would be about 250mA. Which should allow the LED driver with the given conditions.
Please provide the waveforms requested in order to check what might be the cause of the problem
Regards