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LM2575EP Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LM2575EP Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 26 page All Output Voltage Versions Electrical Characteristics (Note 16) (Continued) Specifications with standard type face are for T J = 25˚C, and those with boldface type apply over full Operating Tempera- ture Range. Unless otherwise specified, V IN = 12V for the 3.3V, 5V, and Adjustable version, VIN = 25V for the 12V version, and V IN = 30V for the 15V version. ILOAD = 200 mA. Symbol Parameter Conditions Typ LM2575-XXEP Units (Limits) LM2575HV-XXEP Limit (Note 5) DEVICE PARAMETERS θ JA Thermal Resistance T Package, Junction to Ambient (Note 11) 65 θ JA T Package, Junction to Ambient (Note 12) 45 ˚C/W θ JC T Package, Junction to Case 2 θ JA N Package, Junction to Ambient (Note 13) 85 θ JA M Package, Junction to Ambient (Note 13) 100 θ JA S Package, Junction to Ambient (Note 14) 37 ON /OFF CONTROL Test Circuit Figure 2 V IH ON /OFF Pin Logic V OUT = 0V 1.4 2.2/2.4 V(Min) V IL Input Level V OUT = Nominal Output Voltage 1.2 1.0/0.8 V(Max) I IH ON /OFF Pin Input ON /OFF Pin = 5V (OFF) 12 µA Current 30 µA(Max) I IL ON /OFF Pin = 0V (ON) 0µA 10 µA(Max) Note 4: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 5: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. Note 6: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2575EP is used as shown in the Figure 2 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics. Note 7: Output (pin 2) sourcing current. No diode, inductor or capacitor connected to output pin. Note 8: Feedback (pin 4) removed from output and connected to 0V. Note 9: Feedback (pin 4) removed from output and connected to +12V for the Adjustable, 3.3V, and 5V versions, and +25V for the 12V and 15V versions, to force the output transistor OFF. Note 10: VIN = 40V (60V for the high voltage version). Note 11: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with 1⁄2 inch leads in a socket, or on a PC board with minimum copper area. Note 12: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with 1⁄2 inch leads soldered to a PC board containing approximately 4 square inches of copper area surrounding the leads. Note 13: Junction to ambient thermal resistance with approximately 1 square inch of pc board copper surrounding the leads. Additional copper area will lower thermal resistance further. See thermal model in Switchers made Simple software. Note 14: If the TO-263 package is used, the thermal resistance can be reduced by increasing the PC board copper area thermally connected to the package: Using 0.5 square inches of copper area, θJA is 50˚C/W; with 1 square inch of copper area, θJA is 37˚C/W; and with 1.6 or more square inches of copper area, θJA is 32˚C/W. Note 15: The oscillator frequency reduces to approximately 18 kHz in the event of an output short or an overload which causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average power dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%. Note 16: "Testing and other quality control techniques are used to the extent deemed necessary to ensure product performance over the specified temperature range. Product may not necessarily be tested across the full temperature range and all parameters may not necessarily be tested. In the absence of specific PARAMETRIC testing, product performance is assured by characterization and/or design." www.national.com 8 |
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