Note 1 Test Circuit Figure 15 Output Voltage V in 25 V I Load 05 A T J 25 C

Note 1 test circuit figure 15 output voltage v in 25

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(Note 1 Test Circuit Figure 15) Output Voltage (V in = 25 V, I Load = 0.5 A, T J = 25 ° C) V out 11.76 12 12.24 V Output Voltage (15 V V in 40 V, 0.5 A I Load 3.0 A) V out V T J = 25 ° C 11.52 12 12.48 T J = −40 to +125 ° C 11.4 12.6 Efficiency (V in = 15 V, I Load = 3.0 A) η 88 % LM2576−15 (Note 1 Test Circuit Figure 15) Output Voltage (V in = 30 V, I Load = 0.5 A, T J = 25 ° C) V out 14.7 15 15.3 V Output Voltage (18 V V in 40 V, 0.5 A I Load 3.0 A) V out V T J = 25 ° C 14.4 15 15.6 T J = −40 to +125 ° C 14.25 15.75 Efficiency (V in = 18 V, I Load = 3.0 A) η 88 % LM2576 ADJUSTABLE VERSION (Note 1 Test Circuit Figure 15) Feedback Voltage (V in = 12 V, I Load = 0.5 A, V out = 5.0 V, T J = 25 ° C) V out 1.217 1.23 1.243 V Feedback Voltage (8.0 V V in 40 V, 0.5 A I Load 3.0 A, V out = 5.0 V) V out V T J = 25 ° C 1.193 1.23 1.267 T J = −40 to +125 ° C 1.18 1.28 Efficiency (V in = 12 V, I Load = 3.0 A, V out = 5.0 V) η 77 % 1. External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2576 is used as shown in the Figure 15 test circuit, system performance will be as shown in system parameters section . 2. Tested junction temperature range for the LM2576: T low = −40 ° C T high = +125 ° C
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LM2576 4 DEVICE PARAMETERS ELECTRICAL CHARACTERISTICS (Unless otherwise specified, V in = 12 V for the 3.3 V, 5.0 V, and Adjustable version, V in = 25 V for the 12 V version, and V in = 30 V for the 15 V version. I Load = 500 mA. For typical values T J = 25 ° C, for min/max values T J is the operating junction temperature range that applies [Note 2], unless otherwise noted.) Characteristics Symbol Min Typ Max Unit ALL OUTPUT VOLTAGE VERSIONS Feedback Bias Current (V out = 5.0 V Adjustable Version Only) I b nA T J = 25 ° C 25 100 T J = −40 to +125 ° C 200 Oscillator Frequency Note 3 f osc kHz T J = 25 ° C 52 T J = 0 to +125 ° C 47 58 T J = −40 to +125 ° C 42 63 Saturation Voltage (I out = 3.0 A Note 4) V sat V T J = 25 ° C 1.5 1.8 T J = −40 to +125 ° C 2.0 Max Duty Cycle (“on”) Note 5 DC 94 98 % Current Limit (Peak Current Notes 3 and 4) I CL A T J = 25 ° C 4.2 5.8 6.9 T J = −40 to +125 ° C 3.5 7.5 Output Leakage Current Notes 6 and 7, T J = 25 ° C I L mA Output = 0 V 0.8 2.0 Output = −1.0 V 6.0 20 Quiescent Current Note 6 I Q mA T J = 25 ° C 5.0 9.0 T J = −40 to +125 ° C 11 Standby Quiescent Current (ON/OFF Pin = 5.0 V (“off”)) I stby m A T J = 25 ° C 80 200 T J = −40 to +125 ° C 400 ON/OFF Pin Logic Input Level (Test Circuit Figure 15) V V out = 0 V V IH T J = 25 ° C 2.2 1.4 T J = −40 to +125 ° C 2.4 V out = Nominal Output Voltage V IL T J = 25 ° C 1.2 1.0 T J = −40 to +125 ° C 0.8 ON/OFF Pin Input Current (Test Circuit Figure 15) m A ON/OFF Pin = 5.0 V (“off”), T J = 25 ° C I IH 15 30 ON/OFF Pin = 0 V (“on”), T J = 25 ° C I IL 0 5.0 3. 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 dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%.
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  • Spring '19
  • Margaret Earle
  • Switched-mode power supply, Vout

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