| Part Number | SI9121 |
| Manufacturer | Vishay Siliconix |
| Title | High-Voltage/ Non-Isolated Buck-Boost Converter for ISDN Digital Phones |
| Description | The Si9121 simplifies the –48-V to +5-V or +3.3-V converter design for ISDN application by integrating the floating feedback error amplifier provi... |
| Features |
D Fixed +5-V or +3.3-V Output D Integrated Floating Feedback Amplifier D On-Chip 70-V, 1.5-W N-Channel MOSFET Switch D Integrated High Voltage Start-Up Circuit, with VCC Regulator D D D D D –10-V to –60-V Input Voltage Range 95-kHz PWM Operation Integrated Soft-Start and Oscillator High Efficiency O... |
| File Size | 72.42KB |
| Datasheet |
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SI9120 : The Si9120 is a BiC/DMOS integrated circuit designed for use in low-power, high-efficiency off-line power supplies. High-voltage DMOS inputs allow the controller to work over a wide range of input voltages (10- to 450-VDC). Current-mode PWM control circuitry is implemented in CMOS to reduce quiescent current to less than 1.5 mA. A CMOS output driver provides high-speed switching for MOSFET devices with gate charge, Qg, up to 25 nC, enough to supply 30 W of output power at 100 kHz. These devices, when combined with an output MOSFET and transformer, can be used to implement single-ended power converter topologies (i.e., flyback and forward). The Si9120 is available in both standard and lead (P.
SI9122 : 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 33−72 V and withstand 100 V, 100 ms transients, 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 .