LM2595ATPBCKGEVB ON Semiconductor, LM2595ATPBCKGEVB Datasheet - Page 15
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LM2595ATPBCKGEVB
Manufacturer Part Number
LM2595ATPBCKGEVB
Description
EVAL BOARD FOR LM2595ATPBCKG
Manufacturer
ON Semiconductor
Specifications of LM2595ATPBCKGEVB
Design Resources
LM2595ATPBCKGEVB BOM LM2595ATPBCKGEVB Gerber Files LM2595ATPBCKGEVB Schematic
Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
5V
Current - Output
1A
Voltage - Input
4.5 ~ 40 V
Regulator Topology
Buck
Frequency - Switching
150kHz
Board Type
Fully Populated
Utilized Ic / Part
LM2595
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With/related Products
LM2595ATPBCKG
Other names
LM2595ATPBCKGEVBOS
Catch Diode
Locate the Catch Diode Close to the LM2595
fast diode to provide a return path for the inductor current
when the switch turns off. This diode must be located close
to the LM2595 using short leads and short printed circuit
traces to avoid EMI problems.
Use a Schottky or a Soft Switching
Ultra−Fast Recovery Diode
losses within switching power supplies, choosing the
rectifier that best fits into the converter design is an
important process. Schottky diodes provide the best
performance because of their fast switching speed and low
forward voltage drop.
voltage applications (5.0 V and lower). Another choice
could be Fast−Recovery, or Ultra−Fast Recovery diodes. It
has to be noted, that some types of these diodes with an
abrupt turnoff characteristic may cause instability or
EMI troubles.
can better fulfill some quality, low noise design requirements.
Table 2 provides a list of suitable diodes for the LM2595
regulator. Standard 50/60 Hz rectifier diodes, such as the
1N4001 series or 1N5400 series are NOT suitable.
Inductor
switching power supply designs. The style of the core and
the winding technique used in the magnetic component’s
design has a great influence on the reliability of the overall
power supply.
high voltage spikes generated by the rate of transitions in
current within the switching power supply, and the
possibility of core saturation can arise during an abnormal
operational mode. Voltage spikes can cause the
semiconductors to enter avalanche breakdown and the part
can instantly fail if enough energy is applied. It can also
cause significant RFI (Radio Frequency Interference) and
EMI (Electro−Magnetic Interference) problems.
Continuous and Discontinuous Mode of Operation
continuous and the discontinuous modes of operation. The
regulator works in the continuous mode when loads are
relatively heavy, the current flows through the inductor
continuously and never falls to zero. Under light load
conditions, the circuit will be forced to the discontinuous
mode when inductor current falls to zero for certain period
of time (see Figure 20 and Figure 21). Each mode has
distinctively different operating characteristics, which can
affect the regulator performance and requirements. In many
cases the preferred mode of operation is the continuous
mode. It offers greater output power, lower peak currents in
the switch, inductor and diode, and can have a lower output
The LM2595 is a step−down buck converter; it requires a
Since the rectifier diodes are very significant sources of
They provide the best efficiency especially in low output
A fast−recovery diode with soft recovery characteristics
The magnetic components are the cornerstone of all
Using an improper or poorly designed inductor can cause
The LM2595 step−down converter can operate in both the
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15
ripple voltage. On the other hand it does require larger
inductor values to keep the inductor current flowing
continuously, especially at low output load currents and/or
high input voltages.
selection guide for the LM2595 regulator was added to this
data sheet (Figure 19). This guide assumes that the regulator
is operating in the continuous mode, and selects an inductor
that will allow a peak−to−peak inductor ripple current to be
a certain percentage of the maximum design load current.
This percentage is allowed to change as different design load
currents are selected. For light loads (less than
approximately 300 mA) it may be desirable to operate the
regulator in the discontinuous mode, because the inductor
value and size can be kept relatively low. Consequently, the
percentage of inductor peak−to−peak current increases. This
discontinuous mode of operation is perfectly acceptable for
this type of switching converter. Any buck regulator will be
forced to enter discontinuous mode if the load current is light
enough.
Selecting the Right Inductor Style
are core material, cost, the output power of the power supply,
the physical volume the inductor must fit within, and the
amount of EMI (Electro−Magnetic Interference) shielding
that the core must provide. The inductor selection guide
covers different styles of inductors, such as pot core, E−core,
toroid and bobbin core, as well as different core materials
such as ferrites and powdered iron from different
manufacturers.
be the best choice. Since the magnetic flux is contained
within the core, it generates less EMI, reducing noise
problems in sensitive circuits. The least expensive is the
bobbin core type, which consists of wire wound on a ferrite
rod core. This type of inductor generates more EMI due to
the fact that its core is open, and the magnetic flux is not
contained within the core.
same printed circuit board, open core magnetics can cause
Waveform
Waveform
To simplify the inductor selection process, an inductor
Some important considerations when selecting a core type
For high quality design regulators the toroid core seems to
When multiple switching regulators are located on the
Inductor
Current
Current
Switch
Power
Figure 20. Continuous Mode Switching Current
0.4 A
0.8 A
0 A
0 A
HORIZONTAL TIME BASE: 2.0 ms/DIV
Waveforms