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IHLP4040DZER1R0 Datasheet(PDF) 4 Page - Vishay Siliconix |
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IHLP4040DZER1R0 Datasheet(HTML) 4 Page - Vishay Siliconix |
4 / 10 page SiC401, SiC402, SiC403 www.vishay.com Vishay Siliconix Revision: 17-Nov-14 4 Document Number: 62923 For technical questions, contact: powerictechsupport@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 The UVLO will be activated if the voltage present at this pin is below 2.6 V. This can be set using the following equation. If under voltage is not a consideration then this can be connected to VIN. The divider values for this pin can be set using the following equation: SOFT START SETTING Soft start is a useful function helping to limit the current draw from the source at switch on. This is simply set with a ceramic capacitor using the following equation: A 2. 2 nF capacitor will provide ~ 1 ms soft start time. BOOTSTRAP CIRCUIT A bootstrap capacitor of 100 nF will be sufficient for this circuit with switching frequencies from 200 kHz to 500 kHz. A series resistor has been added in order to slow down the low side switch in and minimize overshoot without adding a snubber. This is user adjustable. VDD DECOUPLING The VDD pin will need to be decoupled in order to provide a stable voltage internally and externally. The value for this capacitor is recommended as ≥ 1 μF. CURRENT LIMIT RESISTOR The current limit is set by placing a resistor between pins LXS and ILIM. The values can be found using the following equations. SiC401: SiC402: SiC403: OUTPUT CAPACITANCE The output capacitance will be determined by the ripple voltage requirement. Voltage mode COT topology can work with very small values of capacitor ESR however a ripple injection network will also be required for stable operation. The overall capacitance needs to be calculated next. The following equations are used to calculate the size needed to meet a transient load response: Where ILPK is the peak inductor current, IMAX. is the maximum output current, dILOAD is the current step in μF and VPK is the peak voltage, the output voltage summed with the specified over and under shoot. INPUT CAPACITANCE In order to keep the design compact and minimize parasitic elements, ceramic capacitors will be chosen. The initial requirement for the input capacitance is decided by the maximum input voltage, 16 V in this case however a 35 V rated capacitor will be chosen of the X7R variety. The footprint will be a compact 1206. In order to determine the minimum capacitance the input voltage ripple needs to be specified; VCINPP ≤ 150 mV is a suitable starting point. This magnitude is determined by the final application specification. The input current needs to be determined for the lowest operating input voltage: The minimum input capacitance can then be found, HIGH OUTPUT VOLTAGE OPERATION For the SiC40X family the recommended maximum output voltage of no more than 75 % of VIN. For applications where an output voltage greater than 5 V is required a resistive network should be used to step down the output voltage in order to provide the VOUT pin with 4.5 V. For example, if an output voltage of VOUT = 8.5 V is required, setting R2 = 10 k Ω and VOUT PIN = 4.5 V results in R1 = 8870 Ω. The switching frequency will also need recalculating using a VOUT PIN magnitude of 4.5 V. Fig. 1 - Resistor Divider Network Allows 4.5 V at the VOUT PIN V ENL = V IN x R9 R 1 + R9 ---------------------- C SS = t SS 500 000 --------------------- R ILIM = 792 x ILIM x 0.101 x 5 V - V DD () + 1 [] R ILIM = 446 x ILIM x 0.099 x 5 V - V DD () + 1 [] R ILIM = 1176 x ILIM x 0.112 x 5 V - V DD () + 1 [] I LPK = IMAX. + 0.5 x IRIPPLE MAX, C OUT MIN. = ILPK x L x I LPK V OUT -------------- - I MAX. dI LOAD ------------------ x dt 2 x V PK - VOUT () -------------------------------------------------------------- I CIN(RMS) = I OUT V IN ------------ x V OUT x V IN - VOUT () C IN MIN. = IOUT x DC - 1 - DC () V CINPP x FSW -------------------------------------- R 1 = R 2 x V OUT - VOUT PIN () V OUT PIN ------------------------------------------------------------- F SW = V OUT PIN t ON x VIN ------------------------- SiC40X COUT VOUT VOUT PIN LX R1 R2 |
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