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.