Solution Finder Get Tech Support

LYT7503D

Phase-Cut Dimmable Single-Stage LED Driver IC with Combined PFC and Constant Current Output for Buck Topology

This is an active product that is not recommended for new designs.
Applications

Product Details

The LYTSwitch™-7 family is ideal for single-stage, high PF, constant current LED dimmable applications.

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 CrM operation results in low turn-on losses and reduces cost of output diode (slower reverse recovery).

LYTSwitch-7 devices are suitable for applications from 4 W to 22 W. See Graph 1 for selection guidance based on typical inductance. LYTSwitch-7 peak current mode operation is suitable for TRIAC applications without the need of an active bleeder.

Product Highlights

Single-Stage PFC + Accurate CC Output

  • ±3% CC regulation in single line input voltage applications
  • Power factor >0.9
  • High efficiency >85%
  • Robust 725 V MOSFET for increased line voltage surge performance
  • Critical Conduction Mode (CrM) buck
  • Low EMI
  • Excellent line noise and transient rejection

Dimming Highlights

  • Fast turn-on (<500 ms)
  • Low pop-on
  • Better than 10:1 dimming ratio
  • Simple passive R-C damper
  • Monotonic dimming response

Design Flexibility

  • Wide input (90 VAC – 308 VAC) and output voltage range operation
  • LYT7503D and LYT7504D both cover power range for optimum device selection
  • Requires no inductor bias winding
  • Small form factor package – SO-8

Highest Reliability

  • Industries lowest component count dimming solution
  • 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

Specifications

Specifications
Output Power (Max) - Open Frame, 230V 22.00 W
Breakdown Voltage 725 V
IC Package SO-16B
Device Package SO-16B
Mounting Type Surface Mount

Resources