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MP2487DN Datasheet(PDF) 11 Page - Monolithic Power Systems |
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MP2487DN Datasheet(HTML) 11 Page - Monolithic Power Systems |
11 / 13 page MP2487 – 55V, 1A, HIGH-POWER LEDS DRIVER MP2487 Rev. 1.0 www.MonolithicPower.com 11 9/22/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 3. Determine if the second compensation capacitor (CCOM2) is required, which is connected from COMP pin to GND. It is required if the ESR zero of the output capacitor is located at less than half of the switching frequency: S OUT ESR f 1 2C R 2 < π× × If this is the case, then add the second compensation capacitor (CCOM2) to set the pole fP3 at the location of the ESR zero. Determine the CCOM2 value by the equation: OUT ESR COM2 COM CR C R × = External Bootstrap Diode An external bootstrap diode may enhance the efficiency of the regulator. In below cases, an external BST diode is recommended from the 5V to BST pin: There is a 5V rail available in the system; VIN is not greater than 5V; VOUT is between 3.3V and 5V; The bootstrap diode can be a low cost one such as IN4148 or BAT54. MP2487 SW BST 0.1 υF 5V Figure 2—External Bootstrap Diode |
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