Datasheet

LM2574, LM2574HV
SNVS104C –JUNE 1999–REVISED APRIL 2013 www.ti.com
Note: Complete circuit not shown.
Note: Pin numbers are for 8-pin PDIP package.
Figure 35. Delayed Startup
Note: Pin numbers are for 8-pin PDIP package.
Figure 36. 1.2V to 55V Adjustable 500 mA Power Supply with Low Output Ripple
Definition of Terms
BUCK REGULATOR
A switching regulator topology in which a higher voltage is converted to a lower voltage. Also known as a step-
down switching regulator.
BUCK-BOOST REGULATOR
A switching regulator topology in which a positive voltage is converted to a negative voltage without a
transformer.
DUTY CYCLE (D)
Ratio of the output switch's on-time to the oscillator period.
(7)
CATCH DIODE OR CURRENT STEERING DIODE
The diode which provides a return path for the load current when the LM2574 switch is OFF.
EFFICIENCY (η)
The proportion of input power actually delivered to the load.
(8)
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