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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LM5145 датащи(PDF) 20 Page - Texas Instruments |
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LM5145 датащи(HTML) 20 Page - Texas Instruments |
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20 / 69 page  9.3 Feature Description 9.3.1 Input Voltage Range (VIN) The LM25143 operational input voltage range is from 3.5 V to 42 V. The device is intended for step-down conversions from 12-V and 24-V supply rails. The application circuit in Figure 9-1 shows all the necessary components to implement an LM25143-based wide-VIN dual-output step-down regulator using a single supply. The LM25143 uses an internal LDO subregulator to provide a 5-V VCC bias rail for the gate drive and control circuits (assuming the input voltage is higher than 5 V plus the necessary subregulator dropout specification). VIN SS2 RES DEMB AGND SS1 COMP2 PGND2 VOUT2 CS2 LO2 SW2 HO2 HB2 VIN COMP1 PGND1 VOUT1 CS1 LO1 SW1 HO1 HB1 VCC PG1 HOL1 LOL1 HOL2 LOL2 EN1 EN2 VCCX RT VDDA PG2 FB2 SYNCOUT FB1 MODE LM25143 LO1 CO2 CIN CSS1 CSS2 CRES CVDD LO2 CO1 RHO2 RHO1 CDITH DITH RRT VOUT2 VOUT1 SYNC Out SYNC In (optional) CVCC2 CVCC1 RS1 RS2 CHF2 RCOMP2 CCOMP2 CHF1 RCOMP1 CCOMP1 Figure 9-1. Dual-Output Regulator Schematic Diagram With an Input Voltage Range of 3.5 V to 42 V In high input voltage applications, make sure the VIN and SW pins do not exceed their absolute maximum voltage rating of 47 V during line or load transient events. Voltage excursions that exceed the Absolute Maximum Ratings can damage the IC. Proceed carefully during PCB layout and use high-quality input bypass capacitors to minimize voltage overshoot and ringing. 9.3.2 High-Voltage Bias Supply Regulator (VCC, VCCX, VDDA) The LM25143 contains an internal high-voltage VCC bias regulator that provides the bias supply for the PWM controller and the gate drivers for the external MOSFETs. The input voltage pin (VIN) can be connected directly to an input voltage source up to 42 V. However, when the input voltage is below the VCC setpoint level, the VCC voltage tracks VIN minus a small voltage drop. The VCC regulator output current limit is 170 mA (minimum). At power up, the regulator sources current into the capacitors connected at the VCC pin. When the VCC voltage exceeds 3.3 V, both output channels are enabled (if EN1 and EN2 are connected to a voltage greater than 2 V) and the soft-start sequence begins. Both channels remain active unless the VCC voltage falls below the VCC falling UVLO threshold of 3.1 V (typical) or EN1 or EN2 is switched to a low state. The LM25143 has two VCC pins that must be connected together on the PCB. TI recommends that two VCC capacitors are connected from VCC1 to PGND1 and from VCC2 to PGND2. The recommended range for each VCC capacitor is from 2.2 µF to 10 µF. LM25143 SNVSC10 – MARCH 2022 www.ti.com 20 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: LM25143 |
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