3.3V, 5.0V, 12V, 15V, Adjustable Output Versions Adjustable Version Ou

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3.3V, 5.0V, 12V, 15V, Adjustable Output Versions Adjustable Version Ou

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52kHz, Step-Down Switching Regulator
3.3V, 5.0V, 12V, 15V, Adjustable Output Versions Adjustable Version Output Voltage Range, 1.23 AG10 Maximum Over Line Load Conditions Guaranteed Output Current Wide Input Voltage Range Requires Only External Components 52kHz Fixed Frequency Internal Oscillator Shutdown Capability, Power Standby Mode High Efficiency Uses Readily Available Standard Inductors Thermal Shutdown Current Limit Protection Moisture Sensitivity Level
LM2575
TO-220
TO-220V
Applications
Simple High-Efficiency Step-Down(Buck) Regulator Efficient Pre-Regulator Linear Regulators On-Card Switching Regulators Positive Negative Converter(Buck-Boost) Negative Step-Up Converters Power Supply Battery Chargers
TO-263
Output Ground Feedback On/Off
DESCRIPTION
LM2575 series regulators monolithic integrated circuits ideally suited easy convenient design step-down switching regualtor(buck converter). circuits this series capable driving load with excellent line load regulation. These devices available fixed output voltages 3.3V, 5.0V,12V, 15V, adjustable output version.
ORDERING INFORMATION
Device LM2575T-X.X LM2575TV-X.X LM2575R Marking LM2575T-X.X LM2575T-X.X LM2575R-X.X Package TO-220 TO-220V TO-263
These regulatiors were designed minimize number externalcomponents simplify power supply design. Standard series inductors optimized with LM2575 offered several different inductor manufacturers. Since LM2575 converter switch-mode power supply, efficiency significantly higher comparison with popular three-terminal limear reguators, especially with higher input voltages. many cases, power dissipated that heatsink required size could reduced dramatically. standard series inductors optimized with LM2575 available from several different manufacturers. This feature greatly simplifies design switch-mode power supplies. LM2575 features include guaranteed tolerance output voltage within specified input voltages output load conditions, +/-10% oscillator frequency (+/- over External shutdown included, featuring (typical) standby current. output switch includes cycle-bycycle current limiting, well thermal shutdown full protection under fault conditions.
2008 Ver.
52kHz, Step-Down Switching Regulator
Typical Application (Fixed Output Voltage Versions)
LM2575
LM2575
Load
Figure Block Diagram Typical Application
ABSOLUTE MAXIMUM RATINGS
(Absolute Maximum Ratings indicate limits beyond which damage device occur) Rating Maximum Supply Voltage On/Off Input Voltage Output Voltage Ground (Steady-State) Power Dissipation TO-220 5Lead Thermal Resistance, Juntion Ambient Thermal Resistance, Juntion Case TO-263 5Lead Thermal Resistance, Juntion Ambient Thermal Resistance, Juntion Case Storage Temperature Range Minimum Rating(Human Body Model C=100 R=1.5) Lead Temperature (Soldering,10seconds) Maximum Junction Temperature Symbol Tstg Value -0.3V +Vin Internally Limited Internally Limited +150 Unit
52kHz, Step-Down Switching Regulator
LM2575
OPERATING RATINGS(Operating Ratings indicate conditions which device
intended functional, guarantee specific performance limits. guaranteed specifications, Electrical Characteristics.) Rating Operating Junction Temperature Range Supply Voltage Symbol Value +125 Unit
ELECTRICAL CHARACTERISTICS SYSTEM PARAMETERS ([Note Test Circuit Figure
(Unless otherwise specified, Adjustable version, version, version. ILoad typical values 25°C, min/max values operating junction temperature range that applies [Note unless otherwise noted.) Characteristics LM2575-3.3V ([Note Test Circuit Figure Output Voltage (Vin 12V, ILOAD=0.5A, TJ=25) Output Voltage (6.0VVin40V, 0.5AILOAD1A TJ=25 +125 Efficiency (Vin=12V, ILOAD=1A) LM2575-5.0V ([Note Test Circuit Figure Output Voltage (Vin 12V, ILOAD=0.5A, TJ=25) Output Voltage (8.0VVin40V, 0.5AILOAD1A TJ=25 +125 Efficiency (Vin=12V, ILOAD=1A) LM2575-12V ([Note Test Circuit Figure Output Voltage (Vin 25V, ILOAD=0.5A, TJ=25) Output Voltage (15VVin40V, 0.5AILOAD1A TJ=25 +125 Efficiency (Vin=12V, ILOAD=1A) LM2575-ADJ ([Note Test Circuit Figure Feedback Voltage (Vin=12V, ILOAD=0.5A, TJ=25)
Feedback Voltage(8.0VVin40V, 0.5AILOAD1A, Vout=5.0V)
Symbol
Unit
Vout Vout
3.234 3.168 3.135
3.366 3.432 3.465
Vout Vout
4.75
5.25
Vout Vout
11.76 11.52 11.4
12.24 12.48 12.6
Vout Vout
1.217 1.193 1.18
1.23 1.23
1.243 1.267 1.28
TJ=25 +125 Efficiency (Vin=12V, ILOAD=1A, Vout=5.0V)
External components such catch diode, inductor, input output capacitors affect switching regulator system performance. When LM2575 used shown Figure test circuit, system performance will shown system parameters section Tested junction temperature range LM2575: Tlow -40°C Thigh +125°C
52kHz, Step-Down Switching Regulator
ELECTRICAL CHARACTERISTICS Device Parameters
LM2575
(Unless otherwise specified, Adjustable version, version, version. ILoad typical values 25°C, min/max values operating junction temperature range that applies [Note unless otherwise noted.) Characteristics Output Voltage Versions
Feedback Bias Current (Vout=5.0V [Adjustable Version Only])
Symbol
Unit
TJ=25 +125 Oscillator Frequency [Note TJ=25 +125 +125 Saturation Voltage (Iout=1A [note TJ=25 +125 Duty Cycle ("0") [Note Current Limit (Peak Current [Note TJ=25 +125 Output Leakage Current [Note TJ=25 Output Output -1.0V Quiescent Current [Note TJ=25 +125 Standby Quiescent Current (ON/OFF 5.0V ("off")) TJ=25 +125 ON/OFF Logic Input Level (Test circuit Figure Vout=0V TJ=25 +125 Vout=Nominal Output Voltage TJ=25 +125 ON/OFF Input Current (Test Circuit Figure ON/OFF 5.0V (Regulator OFF), TJ=25 ON/OFF (Regulator ON), TJ=25
Fosc
Vsat
ISTBY
oscillator frequency reduces approximately event output short overload which causes regulated output voltage drop approximately from nominal output voltage. This self protection feature lowers average dissipation lowering minimum duty cycle from down approximately Output (Pin sourcing current. diode, inductor capacitor connected output pin. Feedback (Pin removed from output connected Feedback (Pin removed from output connected Adjustable, 5.0V ersions, and15 versions, force output transistor "off".
52kHz, Step-Down Switching Regulator
TYPICAL PERFORMANCE CHARACTERISTICS (Circuit Figure
LM2575
52kHz, Step-Down Switching Regulator
TYPICAL PERFORMANCE CHARACTERISTICS (Circuit Figure
LM2575
52kHz, Step-Down Switching Regulator
LM2575
LM2575
LM2575
52kHz, Step-Down Switching Regulator
LM2575
FUNCTION DESCRIPTION
Symbol
Description This positive input supply LM2575 step-down switching
regulator.In order minimize voltage transients supply switching currents needed regulator, suitable input bypass capacitor must present .(Cin Figure Output This emitter internal switch. saturation voltage Vsat this output switch typically should kept mind that area connected this should kept minimum order minimize coupling sensitive circuitry. Circuit ground pin. information about printed circuit board layout. Feedback This senses regulated output voltage complete feedback loop. signal divided internal resistor divider network applied non-inverting input internal error amplifier. Adjustable version LM2575 switching regulator this direct input error amplifier resistor network connected externally allow programming output voltage. ON/OFF allows switching regulator circuit shut down using logic level signals, thus dropping total input supply current approximately threshold voltage typically Applying voltage above this value +Vin) shuts regulator off. voltage applied this lower than 1.4V this left open, regulator will "on" condition
52kHz, Step-Down Switching Regulator
LM2575
LM2575-5.0
52kHz, Step-Down Switching Regulator
LM2575
LM2575
LM2575-ADJ
52kHz, Step-Down Switching Regulator
LM2575-ADJ
LM2575
52kHz, Step-Down Switching Regulator
LM2575
LM2575-3.3V
LM2575-5.0V
LM2575-12V
LM2575-15V
LM2575-ADJ
52kHz, Step-Down Switching Regulator
LM2575

3.3V, 5.0V, 12V, 15V, Adjustable Output Versions Adjustable Version Ou

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