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Reverse Recovery Time Formula

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Reverse Recovery Time is the amount of time the current flows in the reverse direction when the forward current simultaneously switches directions due to residual stored charge in BJT. Check FAQs

t rr = \sqrt{2 \cdot \frac{Q RR}{ΔI}}

t_rr - Reverse Recovery Time?Q_RR - Reverse Recovery Charge?ΔI - Change in Current?

Reverse Recovery Time Example

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With units

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Here is how the Reverse Recovery Time equation looks like with Values.

Here is how the Reverse Recovery Time equation looks like with Units.

Here is how the Reverse Recovery Time equation looks like.

2.2852 = \sqrt{2 \cdot \frac{0.04}{15.32}}

2.2852s = \sqrt{2 \cdot \frac{0.04C}{15.32mA}}

2.2852 = \sqrt{2 \cdot \frac{0.04}{15.32}}

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Reverse Recovery Time Solution

Follow our step by step solution on how to calculate Reverse Recovery Time?

FIRST Step Consider the formula

t rr = \sqrt{2 \cdot \frac{Q RR}{ΔI}}

Next Step Substitute values of Variables

∴

t rr = \sqrt{2 \cdot \frac{0.04C}{15.32mA}}

Next Step Convert Units

∴

t rr = \sqrt{2 \cdot \frac{0.04C}{0.0153A}}

Next Step Prepare to Evaluate

∴

t rr = \sqrt{2 \cdot \frac{0.04}{0.0153}}

Next Step Evaluate

∴

t rr = 2.28515472449515s

LAST Step Rounding Answer

∴

t rr = 2.2852s

Reverse Recovery Time Formula Elements

Variables

Functions

Reverse Recovery Time

Reverse Recovery Time is the amount of time the current flows in the reverse direction when the forward current simultaneously switches directions due to residual stored charge in BJT.

Symbol: t_rr

Measurement: TimeUnit: s

Note: Value should be greater than 0.

Formulas to find Reverse Recovery Time

Reverse Recovery Charge

Reverse Recovery Charge is the charge required to get anode current zero or, recovering its ability to block negative voltage from developing a current in BJT.

Symbol: Q_RR

Measurement: Electric ChargeUnit: C

Note: Value should be greater than 0.

Formulas to find Reverse Recovery Charge

Change in Current

Change in current refers to the variation in the flow of electrical charge carriers, usually electrons or electron-deficient atoms in a transistor device.

Symbol: ΔI

Measurement: Electric CurrentUnit: mA

Note: Value can be positive or negative.

Formulas to find Change in Current

sqrt

A square root function is a function that takes a non-negative number as an input and returns the square root of the given input number.

Syntax: sqrt(Number)

Other formulas in BJT category

Go Reverse Recovery Current

I RR = \sqrt{2 \cdot Q RR \cdot ΔI}

Go Reverse Recovery Charge

Q RR = 0.5 \cdot I RR \cdot t rr

Go Softness Factor

s = \frac{t b}{t a}

Go BJT Turn ON Time

T on = T r + T d

How to Evaluate Reverse Recovery Time?

Reverse Recovery Time evaluator uses Reverse Recovery Time = sqrt(2*Reverse Recovery Charge/Change in Current) to evaluate the Reverse Recovery Time, The Reverse Recovery Time is the time required by the diode to sweep out the excess charge carrier from the drift region. Reverse Recovery Time is denoted by t_rr symbol.

How to evaluate Reverse Recovery Time using this online evaluator? To use this online evaluator for Reverse Recovery Time, enter Reverse Recovery Charge (Q_RR) & Change in Current (ΔI) and hit the calculate button.

FAQs on Reverse Recovery Time

What is the formula to find Reverse Recovery Time?

The formula of Reverse Recovery Time is expressed as Reverse Recovery Time = sqrt(2*Reverse Recovery Charge/Change in Current). Here is an example- 2.285155 = sqrt(2*0.04/0.01532).

How to calculate Reverse Recovery Time?

With Reverse Recovery Charge (Q_RR) & Change in Current (ΔI) we can find Reverse Recovery Time using the formula - Reverse Recovery Time = sqrt(2*Reverse Recovery Charge/Change in Current). This formula also uses Square Root (sqrt) function(s).

Can the Reverse Recovery Time be negative?

No, the Reverse Recovery Time, measured in Time cannot be negative.

Which unit is used to measure Reverse Recovery Time?

Reverse Recovery Time is usually measured using the Second[s] for Time. Millisecond[s], Microsecond[s], Nanosecond[s] are the few other units in which Reverse Recovery Time can be measured.

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