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LM3477 Arkusz danych(PDF) 2 Page - Texas Instruments |
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LM3477 Arkusz danych(HTML) 2 Page - Texas Instruments |
2 / 35 page ISEN FB GND VIN CB SW DR LM3477 COMP/SD CBYP 0.1PF CBOOT 0.1PF CSN 0.1PF DR FB CB SW GND VIN ISEN LM3477 *RFB1 = RFB2 * (Vout - 1.26)/1.26 1 2 3 4 5 6 7 8 VIN 4.5V - 5.5V CIN 120PF/20V RSN 0.02: Q1 FDC653N D 30BG100 L 3.3PH VOUT 2.5V, 3A RFB1 20.5k RFB2 20.0k RC 510 CC1 47nF COUT 47PF ceramic COMP/SD LM3477 SNVS141K – OCTOBER 2000 – REVISED MARCH 2013 www.ti.com Typical Application Circuit Figure 1. Typical High Efficiency Step-Down (Buck) Converter Connection Diagram Figure 2. 8 Lead (VSSOP-8 Package) PIN DESCRIPTION Pin Name Pin Number Description ISEN 1 Current sense input pin. Voltage generated across an external sense resistor is fed into this pin. COMP/SD 2 Compensation pin. A resistor-capacitor combination connected to this pin provides compensation for the control loop. Pull this pin below 0.65V to shutdown. FB 3 Feedback pin. The output voltage should be adjusted using a resistor divider to provide 1.270V at this pin. GND 4 Ground pin. SW 5 Switch Node. Source of the external MOSFET is connected to this node. DR 6 Drive pin. The gate of the external MOSFET should be connected to this pin. CB 7 Boot-strap pin. A capacitor must be connected between this pin and SW pin (pin 5) for proper operation. The voltage developed across this capacitor provides the gate drive for the external MOSFET. VIN 8 Power Supply Input pin. These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 2 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3477 |
Podobny numer części - LM3477 |
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Podobny opis - LM3477 |
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