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ISL97656IRTZ-T Datasheet(PDF) 7 Page - Intersil Corporation |
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ISL97656IRTZ-T Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 8 page 7 All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com FN6439.4 April 2, 2010 Maximum Output Current The MOSFET current limit is nominally 4.0A and guaranteed 3.8A. This restricts the maximum output current, IOMAX, based on Equation 7: where: IL = MOSFET current limit IL(AVG) = average inductor current ΔIL = inductor ripple current VDIODE = Schottky diode forward voltage, typically, 0.6V fS = switching frequency, 600kHz or 1.2MHz D = MOSFET turn-on ratio: Table 1 gives typical maximum IOUT values for 1.2MHz switching frequency and 10µH inductor. Cascaded MOSFET Application A 24V N-Channel MOSFET is integrated in the boost regulator. For the applications where the output voltage is greater than 24V, an external cascaded MOSFET is needed as shown in Figure 11. The voltage rating of the external MOSFET should be greater than AIN. DC PATH BLOCK APPLICATION Note that there is a DC path in the boost converter from the input to the output through the inductor and diode, hence the input voltage will be seen at output with a forward voltage drop of diode before the part is enabled. If this voltage is not desired, the following circuit (see Figure 12) can be inserted between input and inductor to disconnect the DC path when the part is disabled. TABLE 1. TYPICAL MAXIMUM IOUT VALUES VIN (V) VOUT (V) IOMAX (mA) 2.5 5 1790 2.5 9 990 2.5 12 750 3.3 5 2370 3.3 9 1300 3.3 12 970 5 9 1970 5 12 1470 IL ILAVG () 12 ⁄ΔI L × () + = (EQ. 7) ΔI L VIN VO VDIODE + () V IN – [] × LVO ( VDIODE) fS × + × ------------------------------------------------------------------------------ = (EQ. 8) IL-AVG IOUT 1D – ------------- = (EQ. 9) D1 VIN VOUT VDIODE + -------------------------------------------- – = (EQ. 10) FIGURE 11. CASCADED MOSFET TOPOLOGY FOR HIGH OUTPUT VOLTAGE APPLICATIONS INTERSIL ISL97656 LX FB AIN VIN FIGURE 12. CIRCUIT TO DISCONNECT THE DC PATH OF BOOST CONVERTER INPUT EN TO INDUCTOR ISL97656 |
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