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So we are building a 12 volts output buck converter with 17 volts input for our project. And i was wondering if using LM317 as regulators and NE 555 for the PWM generator a good idea.thanks.

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  • \$\begingroup\$ What is the required current compliance and what is the expected current dynamic range? (Or, what's the minimum load and what's the maximum load?) \$\endgroup\$ – jonk Jun 17 '17 at 20:03
  • \$\begingroup\$ I forgot to add thats its for battery charging 12 Volts. \$\endgroup\$ – user152362 Jun 17 '17 at 20:07
  • \$\begingroup\$ You can buy a buck converter controller IC. This will make the process much easier. \$\endgroup\$ – mkeith Jun 18 '17 at 0:45
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The LM317 is a linear regulator with no correlation to a buck converter.

An NE555 is not a practical element for pulse width modulation required of a buck converter.

There are hundreds of special purpose ICs made specifically to be the heart of a buck converter. You should review the available application notes and choose one that satisfies your requirements.

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