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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LM3532 датащи(PDF) 42 Page - Texas Instruments |
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LM3532 датащи(HTML) 42 Page - Texas Instruments |
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42 / 52 page  SW ILED1 GND LM3532 Up to 40V L D1 Paracitic Circuit Board Inductances Current through inductor Pulsed voltage at SW Voltage Spike LCD Display SDA SCL IN OVP COUT Current through Schottky Diode and COUT 2.7V to 5.5V 10 k: 10 k: Affected Node due to capacitive coupling Cp1 Lp1 Lp2 Lp3 VLOGIC IAVE = IIN IPEAK VOUT + VF Schottky ILED2 ILED3 LM3532 SNVS653E – JULY 2011 – REVISED AUGUST 2015 www.ti.com 10 Layout 10.1 Layout Guidelines The LM3532 contains an inductive boost converter which sees a high switched voltage (up to 40 V) at the SW pin, and a step current (up to 1 A) through the Schottky diode and output capacitor each switching cycle. The high switching voltage can create interference into nearby nodes due to electric field coupling (I = CdV/dt). The large step current through the diode, and the output capacitor can cause a large voltage spike at the SW pin and the OVP pin due to parasitic inductance in the step current conducting path (V = LdI/dt). Board layout guidelines are geared towards minimizing this electric field coupling and conducted noise. Figure 44 highlights these two noise generating components. Figure 44. LM3532'S Boost Converter Showing Pulsed Voltage at SW (High Dv/Dt) and Current Through Schottky and COUT (High Di/Dt) 42 Submit Documentation Feedback Copyright © 2011–2015, Texas Instruments Incorporated Product Folder Links: LM3532 |
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