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SI9123 Datasheet(PDF) 1 Page - Vishay Siliconix |
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SI9123 Datasheet(HTML) 1 Page - Vishay Siliconix |
1 / 16 page Si9123 Vishay Siliconix New Product Document Number: 72098 S-03639—Rev. B, 20-Mar-03 www.vishay.com 1 500-kHz Half-Bridge DC-DC Converter With Integrated Secondary Synchronous Rectification Control FEATURES D 12-V to 72-V Input Voltage Range D Compatible with ETSI 300 132-2 100 V, 100-ms Transients D Integrated Half-Bridge 1-A Primary Drivers D Secondary Synchronous Rectifier Control D Voltage Mode Control D Voltage Feedforward Compensation D High Voltage Pre-Regulator Operates During Start-Up D Current Sensing On Low-Side Primary Device D Hiccup Current Control During Shorted Load D Low Input Voltage Detection D Programmable Soft-Start Function D Programmable Oscillator Frequency D Over Temperature Protection APPLICATIONS D Network Cards D Power Supply Modules DESCRIPTION Si9123 is a dedicated half-bridge controller IC ideally suited to fixed telecom dc-dc converter applications where high efficiency is required at low output voltages (e.g. <3.3 V). Designed to operate within the voltage range of 12-72 V and withstand 100 V, 100 ms transients, the IC is capable of controlling and directly driving both primary side MOSFET switches of a half-bridge circuit. High conversion efficiency is achieved by use of synchronous rectifying MOSFET transistors in the secondary. 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 for today’s low output voltages. On-chip control of the dead time delays between the primary and secondary signals keep efficiencies high and prevents accidental destruction of the power transformer or wasted energy from self timed approaches. Such a system can achieve conversion efficiencies well in excess of 90%. FUNCTIONAL BLOCK DIAGRAM Driver Logic Pulse Transformer SEC_SYNC RS - Figure 1. Voltage Control Current Control Pre-Reg Primary Drivers Secondary Drivers Error Amp Opto CLOAD RLOAD VOUT Power Transformer (High) DL Si9123 Half-Bridge Synchronous Controller VINEXT VCC EP CS2 Voltage Information To VCC CVIN1 + CVCC D1 DH CS1 CBOOST 1.215 V BST LX Soft- Start PWM CSS SS REXT VIN (Low) |
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