поискавой системы для электроныых деталей |
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SI9122E датащи(PDF) 1 Page - Vishay Siliconix |
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SI9122E датащи(HTML) 1 Page - Vishay Siliconix |
1 / 20 page Vishay Siliconix Si9122E Document Number: 73866 S-80112-Rev. D, 21-Jan-08 www.vishay.com 1 500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification Drivers DESCRIPTION Si9122E is a half-bridge controller IC ideally suited to fixed telecom applications where high efficiency is required at low output voltages (e.g. < 3.3 V). Designed to operate within the fixed telecom voltage range of 36 V to 75 V, the IC is capable of controlling and driving both the low and high-side switching devices of a half bridge circuit and also controlling the switching devices on the secondary side of the bridge. Due to the very low on-resistance of the secondary MOSFETs, a significant increase in conversion efficiency can be achieved as compared with conventional Schottky diodes. Control of the secondary devices is by means of a pulse transformer and a pair of inverters. Such a system has efficiencies well in excess of 90 % even for low output voltages. On-chip control of the dead time delays between the primary and secondary synchronous signals keep efficiencies high and prevent shorting of the power transformer. An external resistor sets the oscillator frequency from 200 kHz to 500 kHz. Si9122E has advanced current monitoring and control circuitry which allow the user to set the maximum current in the primary circuit. Such a feature acts as protection against output shorting and also provides constant current into large capacitive loads during start-up or when paralleling power supplies. Current sensing is by means of a sense resistor on the low-side primary device. FEATURES • 92 % primary/secondary duty cycle • 135 °C over temperature protection • Compatible with ETSI 300 132-2 • 28 V to 75 V input voltage range • Integrated ± 1 A half bridge primary drivers • Secondary synchronous rectifier control signals with programmable deadtime delay • Voltage mode control • Voltage feedforward compensation • High voltage pre-regulator operates during start-up • Current sensing on low-side primary device • Frequency foldback eliminates constant current tail • Advanced maximum current control during start-up and shorted load • Low input voltage detection • Programmable soft-start function APPLICATIONS • Network cards • Power supply modules • Distributed power systems • Intermediate bus converter • Brick converter FUNCTIONAL BLOCK DIAGRAM AND PIN CONFIGURATION Figure 1. BST DH LX DL CS2 CS1 EP CL_CONT VINDET Si9122E 36 V to 75 V Synchronous Rectifiers VCC - + VREF Error Amplifier Opto Isolator VOUT + - 1 V to 12 V Typ. SRH SRL RoHS COMPLIANT |
Аналогичный номер детали - SI9122E |
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Аналогичное описание - SI9122E |
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