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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsA boost converter’s light-load mode can change not only efficiency but also the size, timing and frequency content of output ripple. For a sensitive load, choose the mode against the load’s actual ripple, transient, audible-noise and RF limits, then validate the complete converter on its real board. There is no universal best setting: the right choice depends on the regulator, input and output ranges, and what the load can tolerate.
Why light-load behavior changes
Many boost converters reduce switching activity at light load using pulse-frequency modulation (PFM), burst operation or pulse skipping. Switching less often can improve light-load efficiency, but the resulting gaps or groups of pulses change the output ripple’s timing and spectrum. A load may therefore see more ripple, low-frequency envelopes, or spectral components that matter even when the average output voltage looks correct.
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Do not assume that a regulator’s “light-load efficiency” feature describes its full behavior. Check the device documentation for its operating modes, how it transitions between them, and whether a pin or control input can select a mode.
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Define what the sensitive load can tolerate
Before selecting a mode or changing components, turn “sensitive” into measurable limits. Establish requirements across the load’s operating states, including startup and load changes.
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- The front side of the PCB can be seen with the words A and B. The output voltage can be changed by using the soldering iron to change the pad on and off.
- DC accuracy: the allowed steady-state output-voltage error.
- Ripple by frequency band: distinguish switching-frequency ripple from lower-frequency burst or pulse-skip envelopes. Include relevant RF bands if the system is susceptible to interference.
- Transient response: maximum acceptable droop and overshoot, and how quickly the output must recover after a load step.
- Noise constraints: whether audible tones or interference with nearby radios, sensors or other circuitry are unacceptable.
- Startup and transitions: behavior during startup and when the converter moves between light-load and higher-load modes.
These limits determine which measurements matter. A single peak-to-peak ripple number may not reveal a low-frequency envelope or an interference problem.
How to find the light-load mode transition
Use the selected regulator’s load-regulation curves to locate the PFM-to-PWM or other mode transition across the input-voltage range. Repeat the check across relevant temperatures and operating conditions; a threshold observed at one input voltage is not a universal current limit.
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- Note: Before the first use, the module is not powered and not connected to the load, the blue potentiometer copper head a word mouth adjustment cap, aligned with the direction of the chest, counterclockwise rotation of the potentiometer to the end of the "ta" sound, and then clockwise rotation of the potentiometer more than 30 turns, and finally connected to the power supply, using a multimeter to monitor the module's output voltage to achieve the desired voltage
If the datasheet provides the necessary thresholds and equations, calculate the transition using the device’s specified mode threshold, inductor ripple and stated operating conditions. Confirm the assumptions against the current datasheet and characterization data. The threshold may move substantially as input voltage changes.
TI’s March 2022 TPS61022 brief gives a device-specific illustration: at typical conditions and 25 °C, its PFM/PWM transition is about 250 mA with 1.8 V input and about 500 mA with 4.2 V input. These are examples for that device, not general boost-converter thresholds. The same brief reports 30 mV typical and 50 mV maximum simulated output ripple under the TPS61022 datasheet’s recommended operating conditions; those figures are likewise specific to the part and conditions. TI’s TPS61022 brief
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Choose between automatic PFM and fixed-frequency operation
Compare the actual modes offered by the regulator rather than treating PFM and PWM as interchangeable labels. The relevant trade-offs include efficiency, ripple amplitude and spectrum, switching or burst frequency, acoustic behavior, interference, load-step response, transition behavior and any required control pins or external components.
| Mode choice | Potential benefit | What to verify |
|---|---|---|
| Automatic PFM, burst or skip | Reduced switching activity can improve light-load efficiency. | Ripple and pulse spacing may vary with load; check low-frequency envelopes, RF interactions, audible noise and the transition into continuous switching. |
| Forced PWM | Predictable switching frequency can place switching energy in a known band. | Confirm efficiency at the lightest load, ripple, thermal behavior and load-step performance for the chosen device. |
| Ultrasonic or other special light-load mode | May move switching activity away from the audible range in the conditions supported by the device. | It does not automatically eliminate conducted or radiated EMI; check the regulator’s exact behavior and measure the assembled system. |
TI’s discussion of the TPS61253A describes auto-PFM, forced-PWM and ultrasonic settings as device-specific choices. For its cited NFC use case, forced PWM sets the switching frequency to 3.8 MHz typical, above the subcarrier band discussed in that article. TI’s stated rationale is: “The proposed solution is to maintain the switching frequency of the boost converter above the subcarrier frequency band.” That example does not establish a universal frequency target for other radios or designs. TI’s NFC-interference article
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Another device-specific example illustrates why an efficiency improvement is not enough to recommend a modification by itself. An Analog Devices PFM-controller circuit note reports a 5% efficiency improvement at medium and light loads in its abstract, and 4–5% in the figure caption, for its particular circuit modification. It also warns that the connection increases output ripple by about 100 mV at light-to-medium loads. Those results describe that circuit, not a general-purpose design change. Analog Devices’ PFM-controller circuit note
Keep the control loop within the boost converter’s limits
A boost power stage has a right-half-plane zero (RHPZ) whose frequency depends on duty cycle and load. It constrains how quickly the control loop can respond: pushing bandwidth too high can undermine stability. Evaluate the RHPZ across the full input, output and load range, and base the design on the lowest frequency found.
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Analog Devices’ general guidance is to keep loop bandwidth below one tenth of the lowest RHPZ frequency. Treat that as a design guideline, not a substitute for the selected controller’s compensation instructions; actual loop design depends on the topology, controller and operating range. Analog Devices’ boost-converter loop guidance
Validate the mode and output on the actual design
Measure the assembled board with the real load or a representative load profile. Include operating points below, near and above the mode transition, along with input-voltage and load extremes that matter to the application.
- Capture output ripple with suitable probing. Use a measurement setup appropriate to the bandwidth and ripple level being assessed, and inspect both switching-frequency ripple and slower burst or skip patterns.
- Apply load steps. Record droop, overshoot and recovery, including steps that cross a mode transition.
- Check acoustic and RF behavior where relevant. Look for audible tones and interference in the system’s actual operating bands; a clean average DC reading does not rule these out.
- Assess stability when the design requires it. Measure loop gain where stability margin matters, and follow the selected regulator’s compensation procedure.
- Recheck after changes. Repeat the measurements after changing the operating mode, layout, compensation or output network. A generic increase in capacitance or a compensation adjustment is not a diagnosis of the underlying mode behavior.
Analog Devices cautions that simulation does not capture all parasitics and nonlinearities, which is why measurements on the real circuit remain important. Analog Devices’ boost-converter loop guidance
Quick Recap
A practical selection sequence
- Write down the load’s DC, ripple-by-band, transient, startup, acoustic and RF limits.
- Read the regulator’s mode description and identify its available automatic and forced settings.
- Find the mode transition across input voltage and other relevant operating conditions using load-regulation curves or device-specific equations.
- Compare the resulting efficiency and noise behavior against the load limits; do not infer that a special mode solves every EMI problem.
- Check loop compensation against the lowest RHPZ over the operating range.
- Verify ripple, transitions, transients and stability on the actual board before accepting the design.
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