Primary Peak Current Limit Back-Solver

 Back-solve the actual primary peak-current limit after slope-compensation subtraction and compare it against a target current requirement.

Input Model for New Users

Enter the raw current-limit threshold, the injected slope-compensation ramp, on-time, sense resistor, and the target peak current. The tool subtracts the compensation ramp from the sense threshold before converting the remaining headroom into actual peak current.

What the Tool Calculates and Why It Matters

The calculator reports effective threshold, actual peak-current limit, and the threshold required to reach a target current. That matters in current-mode supplies where a threshold that looks sufficient on paper is materially reduced by the compensation ramp at long on-times.

End-to-End Example Workflow

Use the longest on-time corner, enter the real slope-compensation value and sense resistor, then compare the solved peak current against the target. If the result is short, adjust threshold, turns ratio, or sense scaling before chasing the problem elsewhere.

Advanced Domain Use Cases

This is useful for flyback current-limit tuning, controller migration work, and reviewing whether a protection setting that passed nominal testing still holds at worst-case duty cycle.

Failure Modes and Recovery Patterns

The usual failure mode is a unit mix between millivolts, microseconds, and milliohms. If the answer is implausible, first verify the ramp units and then confirm whether the sense resistor value is the effective value seen by the controller input.

Operational Adoption

Use this when current-limit targets and slope-compensation settings are being negotiated at the same time. Open the live tool for a quick peak-current back-solve.

Copy and Paste Examples

Use the following baseline template to test the Primary Peak Current Limit Back-Solver endpoint quickly. Replace sample values with your production-like payload.

Input Template

Sample input for Primary Peak Current Limit Back-Solver

Operation Checklist

- Ramp-consumed threshold subtraction from the raw current-limit sense level
- Peak-current-limit solving from the effective threshold and sense resistance
- Target-margin and required-threshold reporting for controller setup review

Expected Output Shape

Deterministic output report for Primary Peak Current Limit Back-Solver

Frequently Asked Questions

What is the main purpose of Primary Peak Current Limit Back-Solver?

Back-solve the actual primary peak-current limit after slope-compensation subtraction and compare it against a target current requirement.

What input should I provide?

Provide clean source data that matches the operation you select. Typical operations include: Ramp-consumed threshold subtraction from the raw current-limit sense level, Peak-current-limit solving from the effective threshold and sense resistance, Target-margin and required-threshold reporting for controller setup review.

What errors should I expect?

Most failures come from malformed input, type mismatches, or rule conflicts. Common patterns: Mixing millivolt, microsecond, and milliohm units in the ramp subtraction, Ignoring propagation delay and sample timing in the real current-limit trip point, Using nominal values instead of worst-case tolerances on threshold and sense resistance.

How should I use this tool in production workflows?

Treat output as a deterministic validation step and pair it with test fixtures. Best practices: Check the result at the longest on-time corner, Use component tolerances when reviewing real current-limit margin, Validate final peak current on the bench with a representative stress condition.

Need hands-on validation? Open the live tool.

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