Non-isolated, Phase Dimmable, Buck PFC LED Driver with Digital Reference Control - TPS92075


Non-isolated, Phase Dimmable, Buck PFC LED Driver with Digital Reference Control



The TPS92075 is a hybrid power factor controller (PFC) with a built-in phase dimming decoder. The device analyzes line cycles continuously using an internal, low-power, digital controller for shape and symmetry. The power converter stage generates an analog current reference and uses it to regulate the output current. The device uses control algorithms to manipulate the analog reference. These algorithms optimize dimmer compatibility, power factor and total harmonic distortion (THD).

Using a constant off-time control, the solution achieves low component count, high efficiency and inherently provides variation in the switching frequency. This variation creates an emulated spread spectrum effect easing the converters EMI signature and allowing a smaller input filter.

The TPS92075 also includes standard features: current limit, overvoltage protection, thermal shut-down, and VCC undervoltage lockout, all in packages


  • Controlled Reference Derived PFC
  • Integrated Digital Phase-Angle Decoder
  • Digital 50/60 Hz Synchronization
  • Phase-Symmetry Balancing
  • Constant LED current operation
  • Fast Start-up
  • Dimming Implemented Via Analog Reference Control
  • Smooth Dimming Transitions
  • Overvoltage Protection
  • Feedback Short-Circuit Protection
  • Leading and Trailing Edge Dimmer Compatibility
  • Low BOM Cost and Small PCB Footprint
  • Patent Pending Digital Architecture
  • Available in 8-Pin SOIC and 6-Pin TSOT

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Parametrics Compare all products in LED Lighting - Illumination

Input Voltage (Type)
Vin (Min) (V)
Vin (Max) (V)
Iout (Max) (A)
Vout (Min) (V)
Vout (Max) (V)
Regulated Outputs (#)
Dimming Method
Power Factor Correction (Min)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Vref (V)
UVLO Thresholds On/Off (V)
Special Features
Operating Temperature Range (C)
Approx. Price (US$)
TPS92075 LM3447 TPS92070 TPS92074
AC/DC     AC/DC     AC/DC     AC/DC    
11     7.5     9     11    
18     17.5     21.5     18    
2     2     0.5     2    
9     9     9     9    
120     60     60     120    
1     1     1     1    
Flyback     Flyback     Buck
Forward Phase (Triac)
Reverse Phase    
Forward Phase (Triac)
Reverse Phase    
Forward Phase (Triac)     Analog
Active     Active     Passive     Active    
Inductive     Inductive     Inductive     Inductive    
50     60     20     50    
300     120     138     300    
1.3     1.6     0.75     1.3    
0.5     1     0.1     0.5    
9.8 / 6.4     10.5 / 7.5     7.88 / 7.78     9.8 / 6.4    
Adjustable Switch Frequency
Soft Start
Thermal Shutdown    
Adjustable Switch Frequency
Soft Switching
Thermal Shutdown    
Soft Switching
Thermal Shutdown    
Adjustable Switch Frequency
Soft Start
Thermal Shutdown    
Catalog     Catalog     Catalog     Catalog    
-40 to 125     -40 to 125     -40 to 125     -40 to 125    
14TSSOP     16TSSOP     6SOT
0.40 | 1ku     0.50 | 1ku     0.60 | 1ku     0.35 | 1ku