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LM2576-5.0WU 데이터시트(PDF) 5 Page - Micrel Semiconductor |
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LM2576-5.0WU 데이터시트(HTML) 5 Page - Micrel Semiconductor |
5 / 9 page August 2005 5 M9999-082605-B LM2576 Micrel, Inc. Electrical Characteristics (continued) LM2576 Units Symbol Parameter Conditions Typ Limit (Limits) (Note 2) ON/OFF CONTROL, FIXED and ADJUSTABLE REGULATORS Test Circuit Figure 1 V IH ON/OFF Pin Logic V OUT = 0V 1.4 2.2/2.4 V(min) V IL Input Level V OUT = 5V 1.2 1.0/0.8 V(max) I IH ON /OFF Pin Logic ON /OFF Pin = 5V (OFF) 4 µA Current 30 µA(max) I IL ON/OFF Pin = 0V (ON) 0.01 µA 10 µA(max) Note 1: Absolute Maximum Rating 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 2: 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 extreme are guaranteed via testing. Note 3: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2576/LM1576 is used as shown in Figure 1 test circuit, system performance will be shown in system parameters section of Electrical Characteristics. Note 4: Output (pin 2) sourcing current. No diode, inductor or capacitor connected to output. Note 5: Feedback (pin 4) removed from output and connected to 0V. Note 6: Feedback (pin 4) removed from output and connected to 12V to force the output transistor OFF. Note 7: Junction to ambient thermal resistance (no external heat sink) for the 5-lead TO-220 package mounted vertically, with 1/2" leads in a socket, or on PC board with minimum copper area. Note 8: Junction to ambient thermal resistance (no external heat sink) for the 5-lead TO-220 package mounted vertically, with 1/4" leads soldered to PC board containing approximately 4 square inches of copper area surrounding the leads. Note 9: Junction to ambient thermal resistance with approximately 1 square inch of pc board copper surrounding the leads. Additional copper will lower thermal resistance further. Typical Performance Characteristics Normalized Feedback Voltage* JUNCTION TEMPERATURE (˚C) 25 20 15 10 5 0 -5 -10 -15 -20 -25 -75 -50 -25 0 25 50 75 100 125 150 VIN = 12V ILOAD = 200mA Normalized to TJ = 25˚C Feedback Voltage vs Duty Cycle* DUTY CYCLE (%) 20 15 10 5 0 -5 -10 -15 -20 ILOAD = 200 mA VIN = 40V VIN = 7V 0 20 40 60 80 100 * Adjustable version only |
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