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LM2574 数据表(PDF) 2 Page - ON Semiconductor |
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LM2574 数据表(HTML) 2 Page - ON Semiconductor |
2 / 28 page LM2574 http://onsemi.com 2 Figure 1. Block Diagram and Typical Application 7.0 - 40 V Unregulated DC Input L1 330 µH Pwr Gnd +Vin 5 Cin 22 µF 4ON/OFF 3 Output 7 Feedback 1 D1 1N5819 Cout 220 µF Typical Application (Fixed Output Voltage Versions) Representative Block Diagram and Typical Application Unregulated DC Input +Vin 5 Cout Feedback 1 Cin L1 D1 R2 R1 1.0 k Output 7 Pwr Gnd 4 ON/OFF 3 Reset Latch Thermal Shutdown 52 kHz Oscillator 1.235 V Band-Gap Reference Freq Shift 18 kHz Comparator Fixed Gain Error Amplifier Current Limit Driver 1.0 Amp Switch ON/OFF 3.1 V Internal Regulator Vout Load Output Voltage Versions 3.3 V 5.0 V 12 V 15 V R2 (Ω) 1.7 k 3.1 k 8.84 k 11.3 k For adjustable version R1 = open, R2 = 0 Ω LM2574 5.0 V Regulated Output 0.5 A Load Sig Gnd 2 Sig Gnd 2 (12) (14) (3) (4) (6) (5) (5) (12) (3) (4) (14) (6) NOTE: Pin numbers in ( ) are for the SO–16W package. ABSOLUTE MAXIMUM RATINGS (Absolute Maximum Ratings indicate limits beyond which damage to the device may occur). Rating Symbol Value Unit Maximum Supply Voltage Vin 45 V ON/OFF Pin Input Voltage – –0.3 V ≤ V ≤ +Vin V Output Voltage to Ground (Steady State) – –1.0 V DW Suffix, Plastic Package Case 751G Max Power Dissipation PD Internally Limited W Thermal Resistance, Junction–to–Air RθJA 145 °C/W N Suffix, Plastic Package Case 626 Max Power Dissipation PD Internally Limited W Thermal Resistance, Junction–to–Ambient RθJA 100 °C/W Thermal Resistance, Junction–to–Case RθJC 5.0 °C/W Storage Temperature Range Tstg –65 °C to +150°C °C Minimum ESD Rating – 2.0 kV (Human Body Model: C = 100 pF, R = 1.5 k Ω) Lead Temperature (Soldering, 10 seconds) – 260 °C Maximum Junction Temperature TJ 150 °C NOTE: ESD data available upon request. |
类似零件编号 - LM2574 |
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类似说明 - LM2574 |
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