WT7527 데이터 시트보기 (PDF) - Unspecified

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WT7527

PC POWER SUPPLY SUPERVISOR

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APPLICATION NOTE

WT7527

Rev. 1.20

When the load current increased, the voltage (VL) cross the inductor is increased.

And when inductor voltage exceeds the resistor voltage (VR), the OCP is active.

Sometimes power-on or load dynamics will cause false output of over-current detection. It can be

solved by connecting a capacitor between VS pin and IS pin. In typical case, C ≥ 0.47uF is suggested.

OCP point can be calculated by the following equation:

Let VR = VL

R × IR = RL × IL

Q IR = 8 × IREF = 8 × VREF

RI

∴

R

=

RL × IL

8 × VREF

RI

For example：

Assume RI=30KΩ, RL=5mΩ, OCP IL=20A.

Sol：R = ( IL * RL ) / ( 8 * IREF )

= ( 20A * 5mΩ) / { 8 * ( 1.2V / 30KΩ)}

= 312.5Ω

Weltrend Semiconductor, Inc.

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