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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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SI9130CG-T1 Fiches technique(PDF) 9 Page - Vishay Siliconix |
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SI9130CG-T1 Fiches technique(HTML) 9 Page - Vishay Siliconix |
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9 / 15 page  Document Number: 70190 S11-0975-Rev. G, 16-May-11 www.vishay.com 9 Vishay Siliconix Si9130 This document is subject to change without notice. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 3.3 V Switching Supply The 3.3 V supply is regulated by a current-mode PWM controller in conjunction with several externals: two N-Channel MOSFETs, a rectifier, an inductor and output capacitors (see Figure 1). The gate drive supplied by DH3 needs to be greater than VL , so it is provided by the bootstrap circuit consisting of a 100 nF capacitor and diode connected to BST3. A low-side switching MOSFET connected to DL3 increases efficiency by reducing the voltage across the rectifier diode. A low value sense resistor in series with the inductor sets the maximum current limit, to disallow current overloads at power-on or in short-circuit situations. The soft-start feature on the Si9130 is capacitor programmable; pin SS3 functions as a constant current source to the external capacitor connected to GND. Excess currents at power-on are avoided, and power-supplies can be sequenced with different turn-on delay times by selecting the correct capacitor value. 5 V Switching Supply The 5 V supply is regulated by a current-mode PWM controller which is nearly the same as the 3.3 V output. The dropout voltage across the 5 V supply, as shown in the schematic in Figure 1, is 400 mV (typ) at 2 A. If the voltage at V+ falls, nearing 5 V, the 5 V supply will lower as well, until the VL linear regulator output falls below the 4 V undervoltage lockout threshold. Below this threshold, the 5 V controller is shut off. The frequency of both PWM controllers is set at 300 kHz when the SYNC pin is tied to REF. Connecting SYNC to either GND or VL sets the frequency at 200 kHz. Figure 2. Si9130 Block Diagram + 5 V LDO Linear Regulator + 3.3 V Reference ON 300 kHz/200 kHz Oscillator ON 3.3 V PWM Controller (See Figure 3) 5 V PWM Controller (See Figure 3) STANDBY FB3 CS3 BST3 DH3 LX3 DL3 SS3 ON3 ON5 PGND FB5 CS5 BST5 DH5 LX5 DL5 SS5 V+ VL REF SHDN SYNC 4.5 V 4 V 2.8 V ON ON 3.6ADJ 3.45ADJ |
Numéro de pièce similaire - SI9130CG-T1 |
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Description similaire - SI9130CG-T1 |
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