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LM2595DSADJG 데이터시트(PDF) 4 Page - ON Semiconductor |
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LM2595DSADJG 데이터시트(HTML) 4 Page - ON Semiconductor |
4 / 25 page LM2595 http://onsemi.com 4 SYSTEM PARAMETERS ELECTRICAL CHARACTERISTICS Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range −40°C to +125°C Characteristics Symbol Min Typ Max Unit LM2595 (Note 1, Test Circuit Figure 16) Feedback Voltage (Vin = 12 V, ILoad = 0.2 A, Vout = 5.0 V, ) VFB_nom 1.23 V Feedback Voltage (8.0 V ≤ Vin ≤ 40 V, 0.2 A ≤ ILoad ≤ 1.0 A, Vout = 5.0 V) VFB 1.193 1.18 1.267 1.28 V Efficiency (Vin = 12 V, ILoad = 1.0 A, Vout = 5.0 V) h − 81 − % Characteristics Symbol Min Typ Max Unit Feedback Bias Current (Vout = 5.0 V) Ib 25 100 200 nA Oscillator Frequency (Note 2) fosc 135 120 150 165 180 kHz Saturation Voltage (Iout = 1.0 A, Notes 3 and 4) Vsat 1.0 1.2 1.3 V Max Duty Cycle “ON” (Note 4) DC 95 % Current Limit (Peak Current, Notes 2 and 3) ICL 1.2 1.15 2.1 2.4 2.6 A Output Leakage Current (Notes 5 and 6) Output = 0 V Output = −1.0 V IL 0.5 13 2.0 30 mA Quiescent Current (Note 5) IQ 5.0 10 mA Standby Quiescent Current (ON/OFF Pin = 5.0 V (“OFF”)) (Note 6) Istby 50 200 250 mA ON/OFF PIN LOGIC INPUT Threshold Voltage 1.6 V Vout = 0 V (Regulator OFF) VIH 2.2 2.4 V Vout = Nominal Output Voltage (Regulator ON) VIL 1.0 0.8 V ON/OFF Pin Input Current ON/OFF Pin = 5.0 V (Regulator OFF) IIH − 15 30 mA ON/OFF Pin = 0 V (regulator ON) IIL − 0.01 5.0 mA 1. External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2595 is used as shown in the Figure 16 test circuit, system performance will be as shown in system parameters section. 2. The oscillator frequency reduces to approximately 30 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%. 3. No diode, inductor or capacitor connected to output (Pin 1) sourcing the current. 4. Feedback (Pin 4) removed from output and connected to 0 V. 5. Feedback (Pin 4) removed from output and connected to +12 V to force the output transistor “off”. 6. Vin = 40 V. |
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