PCA9685 powering 160 RGB leds

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hi:

newbie here, i'm using pca9685 , adafruit library. has 16 channel, 12bit pwm

however facing issue power 160 rgb leds split 5 groups each has 3 channel.

40 leds per channel.

one rgb led taking 20ma

i need 3.2a power of them.

my question :-
1. possible drive rgb leds common anode of constant power 5a ubec sink them pwm pin ?

2. or need use common cathod rgb leds 1 mosfet (irlu024n) each per channel ?

regards,
raymond

1) no

2) no


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