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PDF AP6507 Data sheet ( Hoja de datos )
| Número de pieza | AP6507 | |
| Descripción | 500kHz 18V 3A SYNCHRONOUS DC/DC BUCK CONVERTER | |
| Fabricantes | Diodes | |
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AP6507
500 kHz 18V 3A SYNCHRONOUS DC/DC BUCK CONVERTER
Description
The AP6507 is a 500kHz switching frequency internal
compensated synchronous DCDC buck converter. It has
integrated compensation, and low RDSON high and low side
MOSFETs.
The AP6507 enables continues load current of up to 3A with
efficiency as high as 93%.
The AP6507 features current mode control operation, which
enables fast transient response times and easy loop
stabilization.
The AP6507 simplifies board layout and reduces space
requirements with its high level of integration and minimal
need for external components, making it ideal for distributed
power architectures.
The AP6507 is available in a standard Green SO-8EP
package with exposed PAD for improved thermal
performance and is RoHS compliant.
Pin Assignments
( Top View )
IN 1
SW 2
SW 3
BST 4
SO-8EP
8
7
6
5
Features
Applications
• VIN 4.5V to 18V
• VOUT adjustable to 0.8V
• 500kHz switching frequency
• Enable pin
• Protection:
o OCP
• Gaming Consoles
• TV sets and Monitors
•
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•
Set Top Boxes
Distributed power systems
• Home Audio
• Consumer electronics
o Thermal Shutdown
• Lead Free Finish/ RoHS Compliant (Note 1)
Note:
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
GND
VCC
FB
EN
Typical Application Circuit
100
90
VOUT = 2.5V
80
70
60
50
VIN = 12V
VIN = 5V
40
0 12 3
LOAD CURRENT (A)
Efficiency vs. Load Current
AP6507
Document number: DS33435 Rev. 2 - 2
1 of 13
www.diodes.com
May 2011
© Diodes Incorporated
datasheet pdf - http://www.DataSheet4U.net/
1 page  
AP6507
500 kHz 18V 3A SYNCHRONOUS DC/DC BUCK CONVERTER
Typical Performance Graphs (VIN = 12V, VOUT = 1.2V, TA = +25°C, unless otherwise noted
1.3 13
1.25 11
9
1.2
7
1.15
5
1.1
3
1.05 1
1
0 5 10 15 20
INPUT VOLTAGE (V)
Quiescent Supply Current vs. Input Voltage
5.05
5.045
5.04
5.035
5.03
5.025
5.02
0
1.225
1.2245
1.224
1.2235
1.223
1.2225
1.222
1.2215
1.221
1.2205
1.22
0
5 10 15
INPUT VOLTAGE (V)
VCC Regulator Line Regulation
20
5 10 15 20 25
INPUT VOLTAGE (V)
Line Regulation vs. Output Current
-1
0 5 10 15 20
INPUT VOLTAGE (V)
Shutdown Supply Current vs. Input Voltage
7
6.8
VIN = 12V
VOUT = 1.2V
6.6
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6.4
6.2
6
5.8
5.6
5.4
5.2
5
-20 -10 0 10 20 30 40 50 60 70 80 90
TEMPERATURE (°C)
Current Limit vs. Temperature
1.21
1.208
1.206
1.204
VIN = 12V
1.202
1.2
VIN = 5V
1.198
1.196
1.194
1.192
0
0.5 1 1.5 2 2.5
OUTPUT CURRENT (A)
Load Regulation vs. Output Current
3
AP6507
Document number: DS33435 Rev. 2 - 2
5 of 13
www.diodes.com
May 2011
© Diodes Incorporated
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
AP6507
500 kHz 18V 3A SYNCHRONOUS DC/DC BUCK CONVERTER
Application Information (cont.)
Inductor (cont.)
Peak current determines the required saturation current
rating, which influences the size of the inductor. Saturating
the inductor decreases the converter efficiency while
increasing the temperatures of the inductor and the
internal MOSFETs. Hence choosing an inductor with
appropriate saturation current rating is important.
A 1µH to 10µH inductor with a DC current rating of at least
25% percent higher than the maximum load current is
recommended for most applications.
For highest efficiency, the inductor’s DC resistance should
be less than 200mΩ. Use a larger inductance for
improved efficiency under light load conditions.
Input Capacitor
The input capacitor reduces the surge current drawn from
the input supply and the switching noise from the device.
The input capacitor has to sustain the ripple current
produced during the on time on the upper MOSFET. It
must hence have a low ESR to minimize the losses.
The RMS current rating of the input capacitor is a critical
parameter that must be higher than the RMS input current.
As a rule of thumb, select an input capacitor which has an
RMs rating that is greater than half of the maximum load
current.
Due to large dI/dt through the input capacitors, electrolytic
or ceramics should be used. If a tantalum must be used, it
must be surge protected. Otherwise, capacitor failure
could occur. For most applications, a 4.7µF ceramic
capacitor is sufficient.
An output capacitor with ample capacitance and low ESR
is the best option. For most applications, a 22µF ceramic
capacitor will be sufficient.
Co
=
L(Iout
(Δ V +
+ ΔIinductor )2
2
Vout )2 − Vout2
Where ΔV is the maximum output voltage overshoot.
PC Board Layout
This is a high switching frequency converter. Hence
attention must be paid to the switching currents
interference in the layout. Switching current from one
power device to another can generate voltage transients
across the impedances of the interconnecting bond wires
and circuit traces. These interconnecting impedances
should be minimized by using wide, short printed circuit
traces.
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34mm
External feedback
resistor dividers
must be placed
close to the FB pin.
Input capacitor C1
must be placed as
close as possible
to the IC and to L1.
52mm
Output Capacitor
The output capacitor keeps the output voltage ripple small,
ensures feedback loop stability and reduces the overshoot
of the output voltage. The output capacitor is a basic
component for the fast response of the power supply. In
fact, during load transient, for the first few microseconds it
supplies the current to the load. The converter recognizes
the load transient and sets the duty cycle to maximum, but
the current slope is limited by the inductor value.
Maximum capacitance required can be calculated from the
following equation:
ESR of the output capacitor dominates the output voltage
ripple. The amount of ripple can be calculated from the
equation below:
Voutcapacitor = ΔIinductor * ESR
AP6507 is exposed at the bottom of the package and
must be soldered directly to a well designed thermal pad
on the PCB. This will help to increase the power
dissipation.
External Bootstrap Diode
It is recommended that an external bootstrap diode be
added when the input voltage is no greater than 5V or the
5V rail is available in the system. This helps to improve
the efficiency of the regulator. This solution is also
applicable for D > 65%. The bootstrap diode can be a low
cost one such as BAT54 or a schottky that has a low Vf.
5V
BST 4
BOOST
DIODE
AP6507
10nF
SW 3
AP6507
Document number: DS33435 Rev. 2 - 2
Figure 3. External Bootstrap Diode
11 of 13
www.diodes.com
May 2011
© Diodes Incorporated
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AP6507.PDF ] | |
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