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Current matching in LED strings?

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eem2am1

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Hello,

the video at the bottom of this page about UCC25710 PWM IC says that it can achieve greater than 1% efficiency in multiple strings of LEDs...even though each series string does not have individual current control.............

AC/DC and DC/DC Power Supply - PWM Controller - UCC25710 - TI.com

..Surely this must be false?

With LEDs , every single series strng of LEDs must have its own dedicated current controller.
 

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