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MP2497DS Datasheet(PDF) 11 Page - Monolithic Power Systems |
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MP2497DS Datasheet(HTML) 11 Page - Monolithic Power Systems |
11 / 14 page MP2497 – 3A, 50V, 100kHz STEP-DOWN CONVERTER MP2497 Rev. 1.12 www.MonolithicPower.com 11 12/22/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. Programming the Short Circuit Current Limit The hiccup current limit at output short condition can be programmed to be lower by external resisters (RS1, RS2, RS1=RS2), as shown in figure 4. When output voltage is lower than 200mV, the current limit is described by: OUT _ SL SENSE S1 I R 6.2 A R 100mV ×+ μ × = (14) The current limit at output short condition is: S1 OUT _ SL SENSE 100mV 6.2 A R I R −μ × = (15) SW ISP ISN RSENSE RS1 RS2 200mV 6.2uA Figure 4—Short Circuit Current Limit PC Board Layout The high frequency path (IN, SW and GND) should be placed very close to the device with short, direct and wide traces. The input capacitor needs to be as close as possible to the IN and GND pins. The external feedback resistors should be placed next to the FB pin. Keep the switching node SW short and away from the feedback network. External Bootstrap Diode It is recommended that an external bootstrap diode be added when the system has a 5V fixed input or the power supply generates a 5V output. This helps improve the efficiency of the regulator. The bootstrap diode can be a low cost one such as IN4148 or BAT54. This diode is also recommended for high duty cycle operation (when O U T I N V V >65%) and high output voltage (VOUT>12V) applications. MP2497 BS SW 10nF 5V Figure 5—External Bootstrap Diode Design Example Below is a design example following the application guidelines for the specifications: VIN 8 to 50V VOUT 5V VOVP 6V FSW 100kHz IOUT-L 3A The detailed application schematic is shown in Figure 6. The typical performance and circuit waveforms have been shown in the Typical Performance Characteristics section. For more possible applications of this device, please refer to related Evaluation Board Data Sheets. |
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