LM2597HVM-12 National Semiconductor, LM2597HVM-12 Datasheet - Page 5

• Manufacturer Part Number: LM2597HVM-12
• Description: SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator/ with Features
• Manufacturer: National Semiconductor

All Output Voltage Versions
Electrical Characteristics
Note 6: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2597/
LM2597HV is used as shown in the Figure 12 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics.
Note 7: The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is determined by the severity of current over-
load.
Note 8: No diode, inductor or capacitor connected to output pin.
Note 9: Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
Note 10: Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version, and 15V for the 12V version, to force the output transistor
switch OFF.
Note 11: V
Note 12: Junction to ambient thermal resistance with approximately 1 square inch of printed circuit board copper surrounding the leads. Additional copper area will
lower thermal resistance further. See application hints in this data sheet and the thermal model in Switchers Made Simple
Typical Performance Characteristics
Normalized
Output Voltage
Switch Saturation
Voltage
Quiescent Current
IN
= 40V for the LM2597 and 60V for the LM2597HV.
DS012440-5
DS012440-8
DS012440-2
(Continued)
Line Regulation
Switch Current Limit
Standby
Quiescent Current
5
DS012440-6
DS012440-9
DS012440-3
Efficiency
Dropout Voltage
Minimum Operating
Supply Voltage
™
software.
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DS012440-10
DS012440-4
DS012440-7