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PDF AP65200 Data sheet ( Hoja de datos )
| Número de pieza | AP65200 | |
| Descripción | LIGHT LOAD IMPROVED 2A SYNCH DC/DC BUCK CONVERTER | |
| Fabricantes | Diodes | |
| Logotipo |  |
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AP65200
LIGHT LOAD IMPROVED 2A SYNCH DC/DC BUCK CONVERTER
Description
The AP65200 is a 340kHz switching frequency external compensated
synchronous DC-DC buck converter. It has integrated low RDSON high
and low-side MOSFETs.
The AP65200 enables a continuous load current of up to 2A with
efficiency as high as 95%.
The AP65200 implements an automatic custom light-load efficiency
improvement algorithm.
Pin Assignments
( Top View )
( Top View )
BS 1
IN 2
8 SS BS 1
7 EN IN 2
8 SS
7 EN
SW 3
GND 4
6 COMP SW 3
5 FB GND 4
6 COMP
5 FB
The AP65200 features current mode control operation, which enables
fast, transient response times and easy loop stabilization.
The AP65200 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 AP65200 is available in a standard Green SO-8, MSOP-8EP,
U-DFN2626-10 and SO-8EP package and is RoHS compliant.
SO-8
( Top View )
BS 1
IN 2
SW 3
GND 4
8 SS
7 EN
6 COMP
5 FB
MSOP-8EP
SO-8EP
( Top View )
AGND 1
BS 2
IN 3
SW 4
GND 5
10 SS
9 EN
8 COMP
7 FB
6 GND
U-DFN2626-10
Features
Applications
VIN 4.7V to 18V
2A Continuous Output Current, 3A Peak
Gaming Consoles
Flat Screen TV Sets and Monitors
Efficiency Up to 95%
Set Top Boxes
Automated Light Load Improvement
Distributed Power Systems
VOUT Adjustable to 0.925 to 16V
340kHz Switching Frequency
Home Audio
Consumer Electronics
External Programmable Soft-Start
Network Systems
Enable Pin
FPGA, DSP and ASIC Supplies
OCP and Thermal Protection
Green Electronics
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
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/quality/lead_free.html 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
100
5VIN
95
12VIN
90
85
80
75
0.0 0.2
0.4 0.6 0.8 1.0 1.2 1.4 1.6
LOAD CURRENT (A)
Efficiency vs. Load Current
VOUT = 3.3V
1.8 2.0
AP65200
Document number: DS35548 Rev. 7 - 2
INPUT
C1
10μF
21
IN BST
3
ON 7
SW
OFF EN AP65200
5
FB
8
C4 SS
0.1μF
6
COMP
4
GND
C5
10nF L1
10µH
R1
26.1kΩ
R2
10kΩ
C3
6.8nF
R3
6.8kΩ
OUTPUT
VOUT
3.3V
C2
2 x 22μF
Figure 1 Typical Application Circuit
1 of 18
www.diodes.com
June 2015
© Diodes Incorporated
1 page  
AP65200
Typical Performance Characteristics (@TA = +25°C, VIN = 12V, VOUT = 3.3V, unless otherwise specified.)
0.40 0.024
0.35
0.30
0.25
0.022
0.020
0.018
0.016
0.20 0.014
0.15
0.10
0.05
0.012
0.010
0.008
0.006
0.00
0
4.65
5 10 15 20
INPUT VOLTAGE (V)
Quiescent Supply Current vs. Input Voltage
0.004
0
3.330
5 10 15 20
INPUT VOLTAGE (V)
Shutdown Supply Current vs. Input Voltage
4.60 3.329
4.55 3.328
4.50 3.327
4.45
4.40
3.326
3.325
VIN = 12V
4.35
4.30
4.25
4.20
4.15
-50
0.932
0 50
TEMPERATURE (°C)
Current Limit vs. Temperature
100
3.324
3.323
3.322
3.321
3.320
4.75
344
9.75
14.75
19.75
INPUT VOLTAGE (V)
Line Regulation
24.75
0.930
343
0.928
342
0.926
0.924
341
340
0.922
339
0.920
338
0.918
337
0.916
-50
0 50
TEMPERATURE (°C)
Feedback Voltage vs. Temperature
100
336
-50
0 50
TEMPERATURE (°C)
Oscillator Frequency vs. Temperature
100
AP65200
Document number: DS35548 Rev. 7 - 2
5 of 18
www.diodes.com
June 2015
© Diodes Incorporated
5 Page 
AP65200
Application Information (cont.)
Inductor (continued)
Choose the inductor ripple current to be 30% of the maximum load current. The maximum inductor peak current is calculated from:
IL(MAX)
ILOAD
ΔIL
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% 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.
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
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
ΔIinductor )2
2
(Δ V Vout )2 Vout2
, where ΔV is the maximum output voltage overshoot.
AP65200
Document number: DS35548 Rev. 7 - 2
11 of 18
www.diodes.com
June 2015
© Diodes Incorporated
11 Page | ||
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| PDF Descargar | [ Datasheet AP65200.PDF ] | |
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