DC Power Supply Transformer Selection Chart
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LINEAR OR SWITCH MODE?
Linear power supplies provide a smooth output current and are suitable for use in any applications up to 2.5 Amps, including ripple sensitive devices such as card readers.
Switch mode power supplies provide high power without giving off excessive heat. Very flexible, they may be used with a wide range of transformers.
TRANSFORMER SELECTION The following guide can be used to select the appropriate transformer for your power supply. The following general rules apply:
Linear power supplies provide a smooth output current and are suitable for use in any applications up to 2.5 Amps, including ripple sensitive devices such as card readers.
Switch mode power supplies provide high power without giving off excessive heat. Very flexible, they may be used with a wide range of transformers.
TRANSFORMER SELECTION The following guide can be used to select the appropriate transformer for your power supply. The following general rules apply:
TRANSFORMER SELECTION TABLE
If drawing 2.5 Amps or less at 24V DC from the SW-1224, a 60VA transformer is adequate.
Stealth Labs does not currently supply plug-in transformers, except as part of the power supply kits, PS-1213CT, PS-1213TB and PS-1213CTB (for applications up to 1.3 Amps) and PS-1225CT, PS-1225TB and PS-1225CTB (for applications up to 1.3 Amps). The appropriate transformers are available from any security products distributor. Where a plug-in transformer can be used, this is indicated in the table.
Stealth Labs supplies open frame transformers under part numbers beginning with TOF. They are also available in a metal can under part numbers beginning with TIB. The appropriate open frame transformer part numbers are shown in the table.
Stealth Labs supplies open frame transformers under part numbers beginning with TOF. They are also available in a metal can under part numbers beginning with TIB. The appropriate open frame transformer part numbers are shown in the table.
| · | A linear power supply uses a 12V AC transformer for a 6V DC output, a 16.5V AC transformer for a 12V DC output and a 24V AC transformer for a 24V DC output. |
| · | A switch mode power supply can use a 24V AC transformer for a 12 or 24V DC output. For a 12V DC output, a 16.5V AC transformer may also be used. |
| · | The suggested transformers are the minimum required. A larger transformer (higher VA) may always be used. Two main types of transformers are generally available. |
| · | Plug-in transformers plug directly into an electrical outlet. They provide the most cost effective solution for lower current applications. |
| · | When more current is required, an open frame transformer is needed. These will usually be housed in a metal cabinet, with a power cord going to a wall outlet. |