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SI9122DLP-T1-E3 Datasheet(PDF) 1 Page - Vishay Siliconix |
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SI9122DLP-T1-E3 Datasheet(HTML) 1 Page - Vishay Siliconix |
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1 / 20 page  Vishay Siliconix Si9122 Document Number: 71815 S-80038-Rev. J, 14-Jan-08 www.vishay.com 1 500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification Drivers FEATURES • 12 V to 72 V input voltage range • Integrated half-bridge primary drivers (1 A drive capability) • Secondary synchronous 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 • Over temperature protections APPLICATIONS • Network cards • Power supply modules DESCRIPTION Si9122 is a dedicated half-bridge IC ideally suited to fixed telecom applications where efficiency is required at low output voltages (e.g. < 3.3 V). Designed to operate within the fixed telecom voltage range of 33 to 72 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 the 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 accidental destruction of the power transformer. An external resistor sets the switching frequency from 200 kHz to 625 kHz. Si9122 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. FUNCTIONAL BLOCK DIAGRAM Figure 1. BST DH LX DL CS2 CS1 EP CL_CONT VIN_DET Si9122 12 V to 72 V Synchronous Rectifiers VCC - + VREF Error Amplifier Opto Isolator VOUT + - 1 V to 12 V Typ. SRH SRL RoHS COMPLIANT |
Similar Part No. - SI9122DLP-T1-E3 |
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