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LM2574 Arkusz danych(PDF) 11 Page - Texas Instruments

Numer części LM2574
Szczegółowy opis  SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator
Download  38 Pages
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

LM2574 Arkusz danych(HTML) 11 Page - Texas Instruments

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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)


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