LYT5228D
Single-Stage LED Driver IC with Combined PFC and Constant Current Output in Isolated and Non-Isolated Topologies
Product Details
Description
The LYTSwitch-5 family is ideal for single-stage power factor corrected constant current LED applications – bulbs, tubes and ballasts.
Each device incorporates a high-voltage power MOSFET and discontinuous mode, variable frequency, variable on-time controller. The controller also provides fast (cycle-by-cycle) current limit, input and output OVP, plus advanced thermal management circuitry.
The combination of a low-side switching topology, cooling via electronically quiet SOURCE pins and frequency jitter ensures extremely low EMI. This reduces the size of the input filter components – greatly reducing audible noise.
The part numbers shown in Table 1 describe 3 different power levels and two MOSFET voltage options to cost-optimize designs, while EcoSmart™ switching technology ensures maximum efficiency for each device size and load condition.
Product Highlights
Combined Single-Stage PFC + Accurate CC Output
- Accurate CC, better than ±3%
- Power Factor >0.9
- Low THD, <10% with typical input and output conditions
- >90% efficient in optimized designs
- High switching frequency and DCM allow compact magnetics
Design Flexibility
- Supports buck, buck-boost, tapped-buck, boost, isolated and non-isolated flyback topologies
- 2 MOSFET voltage options and 3 power levels for optimum device selection
Highest Reliability
- No electrolytic bulk capacitors or optoisolators for increased lifetime
- Comprehensive protection features
- Input and output overvoltage
- Open-loop protection
- Advanced thermal control
- Thermal foldback allows output light delivery at abnormally high ambient temperatures
- Hysteretic shutdown provides protection during fault conditions
Specifications
| Power - Output (Max, Univ) | 25.00 W |
| Breakdown Voltage | 725 V |
| Voltage - Input (Min) | 90 V |
| Voltage - Input (Max) | 308 V |
| Auto-Restart & Overvoltage Response | Latch Off |
| IC Package | SO-16B |
| Internal Switch | Yes |
| Mounting Type | Surface Mount |
| Over-Temperature Response | Hysteretic |
| Power Factor | High |
| Temperature - Operating (Min) | -40 °C |
| Temperature - Operating (Max) | 150 °C |
| Control Features |
Frequency Jittering
Auto-Restart/Latching Fault Response
|
| Dimming Interface |
0-10 V
Analog
PWM
|
| Protection Features |
Input Overvoltage
Output Open Loop
Output Overvoltage
Output Undervoltage
Thermal Foldback
|
| Output Profile | CC |
| Topology |
Buck-Boost
Flyback
Boost PFC
|
| Product Sub-Type | PMIC |
