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LM2574M-ADJ/NOPB датащи(PDF) 11 Page - Texas Instruments |
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LM2574M-ADJ/NOPB датащи(HTML) 11 Page - Texas Instruments |
11 / 38 page Unregulated DC Input Copyright © 2016, Texas Instruments Incorporated CIN + 2 Feedback 1 5 VIN Internal Regulator ON / OFF Signal GND + ± + ± 1.23 V BAND ± GAP REFRENCE Reset Thermal Shutdown Current Limit 52 kHz OSCILLATOR Compatator Fixed Gain Error Amp R2 R1 ON / OFF 0.5 Amp Switch 3 7 4 DRIVER Pwr Gnd Output + COUT D1 L1 L O A D VOUT 11 LM2574, LM2574HV www.ti.com SNVS104D – JUNE 1999 – REVISED APRIL 2016 Product Folder Links: LM2574 LM2574HV Submit Documentation Feedback Copyright © 1999–2016, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The LM2574 SIMPLE SWITCHER® regulator is an easy-to-use, non-synchronous, step-down DC-DC converter with a wide input voltage range from 40 V to up to 60 V for a HV version. It is capable of delivering up to 0.5-A DC load current with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, 15 V, and an adjustable output version. The family requires few external components and the pin arrangement was designed for simple, optimum PCB layout. 7.2 Functional Block Diagram Note: Pin numbers are for the 8-pin PDIP package R1 = 1 k 3.3 V, R2 = 1.7 k 5 V, R2 = 3.1 k 12 V, R2 = 8.84 k 15 V, R2 = 11.3 k For adjustable version, R1 = Open, R2 = 0 Ω 7.3 Feature Description 7.3.1 Current Limit The LM2574 device has current limiting to prevent the switch current from exceeding safe values during an accidental overload on the output. This value (ICL) can be found in Electrical Characteristics for All Output Voltage Versions. 7.3.2 Undervoltage Lockout In some applications, it is desirable to keep the regulator off until the input voltage reaches a certain threshold. An undervoltage lockout circuit which accomplishes this task is shown in Figure 15 while Figure 16 shows the same circuit applied to a buck-boost configuration. These circuits keep the regulator off until the input voltage reaches a predetermined level in Equation 1. VTH ≈ VZ1 + 2 VBE (1) |
Аналогичный номер детали - LM2574M-ADJ/NOPB |
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Аналогичное описание - LM2574M-ADJ/NOPB |
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