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IL44608N75 Datasheet(PDF) 10 Page - IK Semicon Co., Ltd |
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IL44608N75 Datasheet(HTML) 10 Page - IK Semicon Co., Ltd |
10 / 13 page IL44608N EQUATION 8 ⎪ ⎪ ⎪ ⎭ ⎪⎪ ⎪ ⎬ ⎫ ⎪ ⎪ ⎪ ⎩ ⎪⎪ ⎪ ⎨ ⎧ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎡ ⎟⎟ ⎟ ⎟ ⎟ ⎟ ⎠ ⎞ ⎜⎜ ⎜ ⎜ ⎜ ⎜ ⎝ ⎛ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + × + × ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + + = stup pin3 S/L S/Stup stup G BM I I k2 1 k k I I k1 1 1 d where: k1 = Iccs/Istup k2 = IccL/Istup kS/Stup = (Vstup–UVLO2)/(Vstup–UVLO1) kS/L = (UVLO1–UVLO2)/(Vstup–UVLO1) PULSED MODE CURRENT SENSE CLAMPING LEVEL Equations 9, 10, 11 and 12 allow the calculation of the Rcs value for the desired maximum current peak value during the SMPS stand–by mode.] EQUATION 9 S cs cs th cs stby R ) I (R V Ipk × − = − where: Vcs–th is the CS comparator threshold Ics is the CS internal current source RS is the sensing resistor Rcs is the resistor connected between pin 2 and RS EQUATION 10 S th c cs cs th cs stby R V I R 1 V Ipk ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ × − × = − − s EQUATION 11 ( ) S stby cs cs th cs stby R Y R 1 V Ipk − − × − × = where: Ycs–stby = Ics/Vcs–th Taking into account the circuit propagation delay (δtcs) and the Power Switch reaction time (δtps): EQUATION 12 ( ) P ps cs in S stby cs cs th cs stby L ) δt t (δ V R Y R 1 V Ipk + × + ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ × − × = − − 10 |
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