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PDF IL2575-XX Data sheet ( Hoja de datos )
| Número de pieza | IL2575-XX | |
| Descripción | Step-Down Switching Regulator | |
| Fabricantes | IK Semicon | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de IL2575-XX (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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TECHNICAL DATA
1.0 A, 15 V, Step-Down
Switching Regulator
The IL2575 series of regulators are monolithic integrated
circuits ideally suited for easy and convenient design of a step–
down switching regulator (buck converter). All circuits of this series
are capable of driving a 1.0 A load with excellent line and load
regulation. These devices are available in fixed output voltages of
3.3 V, 5.0 V, 12 V, 15 V, and an adjustable output version.
These regulators were designed to minimize the number of
external components to simplify the power supply design. Standard
series of inductors optimized for use with the IL2575 are offered by
several different inductor manufacturers. Since the IL2575
converter is a switch–mode power supply, its efficiency is
www.DaslinitgaenSahifreicerate4ngUtul.yclaotmhoirgsh,eer spinecicaollmy pwairtihsohnighweitrh
popular three–terminal
input voltages. In many
cases, the power dissipated is so low that no heatsink is required
or its size could be reduced dramatically.
A standard series of inductors optimized for use with the
IL2575 are available from several different manufacturers. This
feature greatly simplifies the design of switch–mode power
supplies. The IL2575 features include a guaranteed ±4% tolerance
on output voltage within specified input voltages and output load
conditions, and ±10% on the oscillator frequency (±2% over 0°C to
125°C). External shutdown is included, featuring 80 ㎂ (typical)
standby current. The output switch includes cycle–by–cycle current
limiting, as well as thermal shutdown for full protection under fault
conditions.
IL2575-xx
TO-220-5L
TO-220-5L
TO-263-5L
ORDERING INFORMATION
IL2575Q
IL2575S
IL2575D2
TO-220-5L
TO-220-5L
TO-263-5L
TA = -40° to 125° C for all packages
Features
• 3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions
• Adjustable Version Output Voltage Range, 1.23 to 37 V ±4%
Maximum Over Line and Load Conditions
• Guaranteed 1.0 A Output Current
• Wide Input Voltage Range
• Requires Only 4 External Components
• 52 kHz Fixed Frequency Internal Oscillator
• TTL Shutdown Capability, Low Power Standby Mode
• High Efficiency
• Uses Readily Available Standard Inductors
• Thermal Shutdown and Current Limit Protection
Pin connections
1. Vin
2. Output
3. Ground
4. Feedback
5. ON/OFF
Applications
• Simple High–Efficiency Step–Down (Buck) Regulator
• Efficient Pre–Regulator for Linear Regulators
• On–Card Switching Regulators
• Positive to Negative Converter (Buck–Boost)
• Negative Step–Up Converters
• Power Supply for Battery Chargers
Rev. 00
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 14)
IL2575-xx
www.DataSheet4FUi.gcuorme 2. Normalized Output Voltage
Figure 3. Line Regulation
Figure 4. Switch Saturation Voltage
Figure 5. Current Limit
Figure 6. Dropout Voltage
Figure 7. Quiescent Current
Rev. 00
5 Page 
IL2575-xx
Delayed Startup
There are some applications, like the inverting regulator already mentioned above, which require a
higher amount of startup current. In such cases, if the input power source is limited, this delayed startup
feature becomes very useful. To provide a time delay between the time the input voltage is applied and the
time when the output voltage comes up, the circuit in Figure 20 can be used. As the input voltage is applied,
the capacitor C1 charges up, and the voltage across the resistor R2 falls down. When the voltage on the
ON/OFF pin falls below the threshold value 1.4 V, the regulator starts up. Resistor R1 is included to limit the
maximum voltage applied to the ON/OFF pin, reduces the power supply noise sensitivity, and also limits the
capacitor C1 discharge current, but its use is not mandatory.
When a high 50 Hz or 60 Hz (100 Hz or 120 Hz respectively) ripple voltage exists, a long delay time
can cause some problems by coupling the ripple into the ON/OFF pin, the regulator could be switched
periodically on and off with the line (or double) frequency.
www.DataSheet4U.com
NOTE: This picture does not show the complete circuit.
Figure 20. Delayed Startup Circuitry
Undervoltage Lockout
Some applications require the regulator to remain off until the input voltage reaches a certain threshold
level. Figure 21 shows an undervoltage lockout circuit applied to a buck regulator. A version of this circuit for
buck–boost converter is shown in Figure 22. Resistor R3 pulls the ON/OFF pin high and keeps the regulator
off until the input voltage reaches a predetermined threshold level, which is determined by the following
expression:
NOTE: This picture does not show the complete circuit.
Figure 21. Undervoltage Lockout Circuit for
Buck Converter
Rev. 00
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet IL2575-XX.PDF ] | |
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