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    0.45 | 1ku    0.60 | 1ku    0.35 | 1ku