Datasheet Details
| Part number | AN938 |
|---|---|
| Manufacturer | STMicroelectronics |
| File Size | 572.12 KB |
| Description | Designing |
| Download | AN938 Download (PDF) |
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Overview: www.DataSheet4U.com ® AN938 APPLICATION NOTE DESIGNING WITH L4973, 3.5A HIGH EFFICIENCY DC-DC CONVERTER by N. Tricomi and G. Gattavari INTRODUCTION The L4973 family is a 3.5A monolithic dc-dc converter, step- down topology, operating in continuous mode. It is realized in BCD60 II technology, and it’s available in two plastic packages, POWERDIP18(12+3+3) and SO20L (12+4+4). Two versions are available, one fixing the output voltage, without any voltage divider, at 3.3V, and the second at 5.1V. Both the regulators can control higher output voltage values, by using an external voltage divider. The operating input supply voltage is ranging from 8V to 55V, while the absolute value, with no load, is 60V. New internal design solutions and superior technology performance allowed us to develop and produce a device with improved efficiency in all the operating conditions and reduced external component counts. While internal limiting current and thermal shutdown are today considered standard protections functions mandatory for a safe load supply, oscillator with voltage feedforward will improve line regulation and overall control loop. Soft-start does not allow output overvoltages at turn-on, and synchronization function can reduce EMI problems in multioutputs power supplies.
| Part number | AN938 |
|---|---|
| Manufacturer | STMicroelectronics |
| File Size | 572.12 KB |
| Description | Designing |
| Download | AN938 Download (PDF) |
|
|
|
For a better understanding of the device and it’s working principle, a short description of the main building blocks is given here below, with packaging options and complete block diagram.
Figure 1.
Two packaging options, with the pin function assignements.
| Part Number | Description |
|---|---|
| AN908 | APPLICATION NOTE |