Isolated power supplies for Local Area Networks
Sean Gold
Abstract
Isolated power supplies for local area networks are discussed.
Keywords
Local area networks
LAN
Ethernet
Cheapernet
LT1072
switching regulator
Introduction
Local Area Networks such as Ethernet or Cheapernet, require low cost isolated power supplies with modest line and load regulation. Table 237.1 summarizes the objective design specifications based on IEEE 802.3 and ECMA 200-V. The LT1072 high efficiency switching regulator can be used in isolated flyback mode to satisfy these requirements with minimal support circuitry.1
Table 237.1
Power Supply Specifications for Figure 237.1
| PARAMETER | VALUE | COMMENTS |
| VOUT | −9V | Ethernet 11.4 <VIN < 12.6V |
| Cheapernet ... |
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