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LM2596 Datasheet(PDF) 4 Page - Estek Electronics Co. Ltd |
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LM2596 Datasheet(HTML) 4 Page - Estek Electronics Co. Ltd |
4 / 12 page Note 6: 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 7: No diode, inductor or capacitor connected to output pin. Note 8: Feedback pin removed from output and connected to 0V to force the output transistor switch ON. Note 9: 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 10: VIN = 40V. Note 11: Junction to ambient thermal resistance (no external heat sink) for the TO-220 package mounted vertically, with the leads soldered to a printed circuit board with (1 oz.) copper area of approximately 1 in 2 Note 12: Junction to ambient thermal resistance with the TO-263 package tab soldered to a single printed circuit board with 0.5 in 2 of (1 oz.) copper area. Note 13: Junction to ambient thermal resistance with the TO-263 package tab soldered to a single sided printed circuit board with 2.5 in 2 of (1 oz.) copper area. Note 14: Junction to ambient thermal resistance with the TO-263 package tab soldered to a double sided printed circuit board with 3 in 2 of (1 oz.) copper area on the LM2596S side of the board, and approximately 16 in2 of copper on the other side of the p-c board. TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 1) Normalized Output Voltage Line Regulation Efficiency Switch Saturation Voltage Switch Current Limit Dropout Voltage 1.5 1.0 0.5 0 -0.5 -1.0 -50 -25 0 25 50 75 0 5 10 15 20 25 30 35 40 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 INPUT VOLTAGE (V) 0 5 10 15 20 25 30 35 40 65 70 75 80 85 90 95 INPUT VOLTAGE (V) 3.3V 5V 12V 20V 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 0 12 3 4 SWITCH CURRENT (A) V =12V IN T=-40 C J 0 25 C 0 125 C 0 -50 -25 0 25 50 75 5.5 5.0 4.5 4.0 3.5 V= 12V V=5V IN OUT -50 -25 0 25 50 75 1.6 1.4 1.2 1.0 0.8 0.6 I=3A LOAD I=1A LOAD 4 BEIJING ESTEK ELECTRONICS CO.,LTD LM2596 3AStep-Down VoltageRegulator |
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