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PDF AP65400 Data sheet ( Hoja de datos )
| Número de pieza | AP65400 | |
| Descripción | LIGHT LOAD IMPROVED 4A SYNCH DC/DC BUCK CONVERTER | |
| Fabricantes | Diodes | |
| Logotipo |  |
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AP65400
LIGHT LOAD IMPROVED 4A SYNCH DC/DC BUCK CONVERTER
Description
The AP65400 is a 340kHz switching frequency external compensated
synchronous DC/DC buck converter. It has integrated low RDSON high
and low side MOSFETs.
The AP65400 enables continues load current of up to 4A with
efficiency as high as 96%.
The AP65400 implements an automatic custom light load
efficiency improvement algorithm.
The AP65400 features current mode control operation, which enables
fast transient response times and easy loop stabilization.
The AP65400 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 AP65400 is available in a standard Green SO-8EP package and
is RoHS compliant.
Pin Assignments
Features
• VIN 4.75V to 18V
• 4A Continuous Output Current, 7A Peak
• Efficiency Up to 96%
• Automated Light Load improvement
• VOUT Adjustable to 0.8 to 16V
• 340kHz Switching Frequency
• External Programmable Soft-Start
• Enable Pin
• OCP with Hiccup and Thermal Protection
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. “Green” Device (Note 3)
Applications
• Gaming Consoles
• Flat Screen TV sets and Monitors
• Set Top Boxes
• Distributed power systems
• Home Audio
• Consumer electronics
• Network Systems
• FPGA, DSP and ASIC Supplies
• Green Electronics
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
AP65400
Document number: DS36497 Rev. 1 - 2
1 of 15
www.diodes.com
Figure 1. Typical Application Circuit
April 2014
© Diodes Incorporated
1 page  
AP65400
Typical Performance Characteristics (@TA = +25°C, VIN = 12V, VOUT = 3.3V, unless otherwise specified.)
AP65400
Document number: DS36497 Rev. 1 - 2
5 of 15
www.diodes.com
April 2014
© Diodes Incorporated
5 Page 
AP65400
Application Information (cont.)
Inductor (cont.)
Choose the inductor ripple current to be 30% of the maximum load current. The maximum inductor peak current is calculated from:
IL(MAX)
= ILOAD
+
∆IL
2
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 100mΩ. 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 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 44µF ceramic capacitor is sufficient.
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 = ∆Iinductor * ESR
An output capacitor with ample capacitance and low ESR is the best option. For most applications, a 72µF ceramic capacitor will be sufficient.
Co
=
L(Iout
+
∆Iinductor
2
)2
(∆ V + Vout )2 − Vout2
Where ∆V is the maximum output voltage overshoot.
AP65400
Document number: DS36497 Rev. 1 - 2
11 of 15
www.diodes.com
April 2014
© Diodes Incorporated
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet AP65400.PDF ] | |
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