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LM3224 Scheda tecnica(PDF) 10 Page - Texas Instruments |
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LM3224 Scheda tecnica(HTML) 10 Page - Texas Instruments |
10 / 26 page : RFB1 = RFB2 x VOUT - 1.26 1.26 VOUT = VIN 1-D , D' = (1-D) = VIN VOUT LM3224 SNVS277B – DECEMBER 2004 – REVISED SEPTEMBER 2005 www.ti.com (1) where D is the duty cycle of the switch, D and D ′ will be required for design calculations. SETTING THE OUTPUT VOLTAGE The output voltage is set using the feedback pin and a resistor divider connected to the output as shown in the typical operating circuit. The feedback pin voltage is 1.26V, so the ratio of the feedback resistors sets the output voltage according to the following equation: (2) SOFT-START CAPACITOR The LM3224 has a soft-start pin that can be used to limit the inductor inrush current on start-up. The external SS pin is used to tailor the soft-start for a specific application but is not required for all applications and can be left open when not needed. When used, a current source charges the external soft-start capacitor, Css. The soft- start time can be estimated as: Tss = Css*1.24V/Iss (3) THERMAL SHUTDOWN The LM3224 includes thermal shutdown protection. If the die temperature exceeds 140°C the regulator will shut off the power switch, significantly reducing power dissipation in the device. The switch will remain off until the die temperature is reduced to approximately 120°C. If the cause of the excess heating is not removed (excessive ambient temperature, excessive power dissipation, or both) the device will continue to cycle on and off in this manner to protect from damage. 10 Submit Documentation Feedback Copyright © 2004–2005, Texas Instruments Incorporated Product Folder Links: LM3224 |
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