Current-Mode Slope Compensation Calculator

 Estimate sensed current slopes, the half-down-slope compensation target, and ramp margin for peak-current-mode buck control at a chosen operating point.

Input Model for New Users

Each row represents one buck operating point: scenario name, input voltage, output voltage, inductance, switching frequency, current-sense resistance, and the existing artificial ramp in millivolts per microsecond. These fields are chosen to match the core stability question in peak-current-mode control. Input and output voltages define duty cycle. Inductance and sense resistance translate current slope into the voltage slope seen by the comparator. The final ramp term lets the tool compare what the controller is actually injecting against what the power stage would ideally like to see.

What the Tool Calculates and Why It Matters

The calculator reports duty cycle, sensed up-slope and down-slope, the half-down-slope target, and margin between that target and the configured compensation ramp. Those outputs matter because subharmonic instability often hides until duty cycle rises, current ramps steepen, and the converter starts alternating pulse-to-pulse behavior. A clear slope-compensation number gives control and power engineers a common language for deciding whether the ramp network is fundamentally adequate.

End-to-End Example Workflow

A team bringing up a 48 V to 12 V buck can enter the nominal point and the worst-case high-duty corner in two rows. If the nominal line shows comfortable margin but the high-duty row falls below the half-down-slope target, the next action is obvious: increase injected ramp or revisit switching frequency and inductance. The report becomes a design-review artifact instead of relying on vague statements like “the current loop looks noisy on the bench.”

Advanced Domain Use Cases

This tool is useful when porting a controller between power stages, reviewing compensation after a sense-resistor change, or checking whether a frequency increase quietly broke the original ramp budget. It also helps firmware and analog teams coordinate around digital-ramp implementations, where unit scaling mistakes can be hard to spot. Multiple rows can represent startup, brown-in, and maximum output load corners in one analysis pass.

Failure Modes and Recovery Patterns

The most common error is mixing units, especially milliohms, microhenries, and millivolts per microsecond. Another mistake is applying the tool to conditions that are not simple buck operation. If numbers look inconsistent with lab behavior, recover by confirming the real sense-path gain, checking the effective inductance under bias, and re-running the calculation at the exact duty cycle where oscillation or period-doubling was observed.

Operational Adoption

Use the calculator before bench time to narrow where current-loop instability is likely to appear. It is especially effective as a design-review gate whenever input range, output voltage, or inductance changes. Open the live tool to screen slope-compensation margin across operating corners.

Copy and Paste Examples

Use the following baseline template to test the Current-Mode Slope Compensation Calculator endpoint quickly. Replace sample values with your production-like payload.

Input Template

Sample input for Current-Mode Slope Compensation Calculator

Operation Checklist

- Sense-node current up-slope and down-slope derivation from buck operating-point inputs
- Half-down-slope compensation target solving in mV/us for stability screening
- Existing-ramp margin reporting together with a ripple-current proxy

Expected Output Shape

Deterministic output report for Current-Mode Slope Compensation Calculator

Frequently Asked Questions

What is the main purpose of Current-Mode Slope Compensation Calculator?

Estimate sensed current slopes, the half-down-slope compensation target, and ramp margin for peak-current-mode buck control at a chosen operating point.

What input should I provide?

Provide clean source data that matches the operation you select. Typical operations include: Sense-node current up-slope and down-slope derivation from buck operating-point inputs, Half-down-slope compensation target solving in mV/us for stability screening, Existing-ramp margin reporting together with a ripple-current proxy.

What errors should I expect?

Most failures come from malformed input, type mismatches, or rule conflicts. Common patterns: Applying the calculator to non-buck conditions where Vout is not below Vin, Sense-resistor or ramp-scaling unit mistakes that distort the compensation target, Treating the simplified slope model as complete loop-stability proof without timing or delay review.

How should I use this tool in production workflows?

Treat output as a deterministic validation step and pair it with test fixtures. Best practices: Use maximum-duty conditions when screening compensation margin, Keep sense-path scaling and injected-ramp units explicit in design reviews, Verify the final result with measured current-loop behavior near the highest duty operating point.

Need hands-on validation? Open the live tool.

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