Single-Stage PFC + Accurate CC Output
• ±3% CC regulation in single line input voltage applications
• Power factor >0.9
• High efficiency >93%
• Robust 725 V MOSFET for increased line voltage surge performance
• Critical Conduction Mode (CrM) buck
• Low EMI
• Excellent line noise and transient rejection
Design Flexibility
• Supports high- and low-side buck topologies
• Wide input (90 VAC – 308 VAC) and output voltage range operation
• 3 family members cover power range for optimum device selection
• Requires no inductor bias winding
Highest Reliability
• Lowest component count
• Comprehensive protection features with auto-restart
• Input and output overvoltage protection (OVP)
• Output short-circuit protection
• Open-loop protection
• Advanced thermal control
• Thermal foldback ensures that light continues to be delivered at
elevated temperatures
• Over-temperature shutdown provides protection during fault
conditions
Description
The LYTSwitch™-1 family is ideal for single-stage, high PF, constant
current LED bulbs and tubes.
The family incorporates a high-voltage MOSFET with a variable on-time
CrM controller. Extensive protection features with minimum external
components provide industry leading power density and functionality.
The devices can be used in high-side or low-side non-isolated buck
topology.
The CrM operation results in low turn-on losses and reduces cost of
output diode (slower reverse recovery).
LYTSwitch-1 devices are suitable for applications from 2 W to 22 W.
See Table 1 for selection guidance.