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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LM4510SDEV датащи(PDF) 14 Page - Texas Instruments |
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LM4510SDEV датащи(HTML) 14 Page - Texas Instruments |
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14 / 23 page  [sec] + ) 7 . - 0 V ( x C = t IN OUT SS I CHARGE _ INIT I CHARGE _ SS V x C FB S VEN appropriate VOUT VSS = VFB VOUT = VIN - 0.7V VSS VSS = VIN VOUT LM4510 SNVS533C – SEPTEMBER 2007 – REVISED MAY 2013 www.ti.com Table 3. Suggested CIN and COUT Capacitors and Their Suppliers Case Size Model Type Vendor Voltage Rating Inch (mm) 4.7 µF for CIN C2012X5R0J475 Ceramic, X5R TDK 6.3V 0805 (2012) GRM21BR60J475 Ceramic, X5R muRata 6.3V 0805 (2012) JMK212BJ475 Ceramic, X5R Taiyo-Yuden 6.3V 0805 (2012) C2012X5R0J475K Ceramic, X5R TDK 6.3V 0603 (1608) 10 µF for COUT TMK316BJ106KL Ceramic, X5R Taiyo-Yuden 25V 1206 (3216) 12103D106KAT2A Ceramic, X5R AVX 25V 1210 (3225) SOFT-START FUNCTION AND SOFT-START CAPACITOR SELECTION The LM4510 has a soft-start pin that can be used to limit the input inrush current. Connect a capacitor from SS pin to GND to set the soft-start period. Figure 27 describes the soft start process. • Initial charging period: When the device is turned on, the control circuitry linearly regulating initial charge current charges VOUT by limiting the inrush current. • Soft-start period: After VOUT reaches VIN -0.7V (typ.), the device starts switching and the CS is charged at a constant current of 11 μA, ramping up to VIN. This period ends when VSS reaches VFB. CS should be large enough to ensure soft-start period ends after CO is fully charged. During the initial charging period, the required load current must be smaller than the initial charge current to ensure VOUT reaches VIN -0.7V (typ.). Figure 27. Soft Start Timing Diagram CS Selection The soft-start time without load can be estimated as: (8) Where the IINIT_CHARGE is Initial Charging Current depending on VIN and ISS_CHARGE (11 μA (typ.)). Also, when selecting the fuse current rating, make sure the value is higher than the initial charging current. COMPENSATION COMPONENT SELECTION The LM4510 provides a compensation pin COMP to customize the voltage loop feedback. It is recommended that a series combination of RC and CC1 be used for the compensation network, as shown in the typical application circuit. In addition, CC2 is used for compensating high frequency zeros. 14 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Product Folder Links: LM4510 |
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