SLYT710B september   2017  – august 2023 LM22670 , LM25145 , LM2696 , LM3100 , LM3150 , LM3475 , LM3485 , LM5017 , LM5116 , LM5119 , LM5140-Q1 , LM5145 , TPS40040 , TPS40057 , TPS40170 , TPS51116 , TPS53014 , TPS53219A , TPS53355 , TPS54325 , TPS54336A , TPS543B20 , TPS543C20 , TPS543C20A , TPS54478 , TPS54610 , TPS54620 , TPS548A20 , TPS548D22 , TPS54A20 , TPS56121 , TPS56C215 , TPS62097 , TPS62130 , TPS82130

 

  1.   1
  2. 1 Overview
  3. 2 Voltage mode
  4. 3 Voltage mode with voltage feed-forward
  5. 4 Peak current mode
  6. 5 Average current mode
  7. 6 Emulated current mode
  8. 7 Internally-compensated advanced current mode (ACM)
  9. 8 Hysteretic control mode
  10. 9 Constant on-time
  11. 10Constant on-time with emulated ripple mode
  12. 11DCS-Control™: Direct control with seamless transition into power-save mode
  13. 12Direct connection to the output capacitor (D-CAP™)
  14. 13D-CAP+™
  15. 14D-CAP2™
  16. 15D-CAP3™
  17. 16D-CAP4™

2 Voltage mode

Pulse-width modulation (latch output) is accomplished by comparing a voltage error signal (VE) from the output voltage and reference voltage to a constant saw-tooth-ramp waveform. The ramp is initiated by a clock signal from an oscillator. Good noise-margin performance is attained with a fixed ramp amplitude (VR). Voltage regulation is independent of the output current. Voltage mode uses type-3 compensation addressing a double-pole power stage to support a wide range of output filter combinations for externally compensated devices.

When to use: When a fixed, predictable switching frequency is desired. Also useful when wide output-load variations are possible.

Popular devices: TPS54610, TPS40040, LM22670

Learn more: Switching Power Supply Topology Voltage Mode vs. Current Mode

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