Increasing Regulator Current - notes although the 78xx series of voltage regulators are available with different current outputs you can boost the available current output with this circuit notes although the 78xx series of voltage regulators are available with different current outputs you can boost the available current output with this circuit notes although the 78xx series of voltage regulators are available with different current outputs you can boost the available current output with this circuit the dissipation would be reduced to just 15 watts if you want to increase the output current with a negative regulator such as the 79xx series then the circuit is although the 78xx series of voltage regulators are available with different current outputs you can boost the available current output with this circuit a power transistor is used to supply extra current to the load the regulator maintaining a constant voltage.

this transistor is known as an outboard bypass transistor i m looking to draw about 6a i have an lm338 regulator that can supply up to 5a searching the inter i came across this schematic so basically when the 1r resistor drops 0 6v then the transis max current per regulator is about 1 8a so you really need at least 2a diodes but they are really cheap 0 1usd per piece so just get 3a ones 50v is enough but there are span class news dt 07 05 2017 span nbsp 0183 32 the regulator must deliver to the load the current sense resistor current plus the pnp base current for a total 3 output 0 5 through the regulator will need 2 5 through the pnp collector current gain will be better than 20 so there will be less than 150ma base current that is within the regulator s capability circuit notes although the 78xx series of voltage regulators are available with different current outputs you can boost.

the available current output with this circuit



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