LED Flood Light Ripple Current Chip Study Introduction

Low cost switching DoB (15W) test is currently completed, by recapping
the data, it’s found that flicker is over 63% plus 1pc 47uF E-cap*1.
Aim to reduce & eliminate the flicker, linear LED ripple current IC SY5861B*2
is introduced to study.

Basic information of the IC

• Silgery brand
• 20V to 100V working voltage
• Max 250mA driving current
• Proprietary scheme for low power loss ≤2.5%
• LED open & short protection
• Adaptive for wide output speculation

LED Flood Light Ripple Current Chip Study Test Data

LED Flood Light Ripple Current Chip Study Summary & Conclusion

• A single chip SY5861B can reduce 15 W DoB current ripple to be less than 5%
• Max working voltage is up to 100V
• Multiple chips connecting in parallel is able to realize higher power DoB current reduction
• E-cap is needed to be in front of the chip to reduce heat dissipation
• Rough solution cost is less 0.15$