AP65200-EVM

AP65200-EVM
340kHz 18V 2A Synchronous DC/DC Buck Converter
Description
The AP65200 is a 340kHz switching
frequency externally compensated synchronous DC/DC buck converter. It has integrated low RDSON high- and low-side
MOSFETs.
The AP65200 enables continues load
current of up to 2A with efficiency as high as
96%. The AP65200 features current mode
control operation, which enables fast
transient response times and easy loop
stabilization.
The AP65200 implements an automatic
custom light load efficiency improvement
algorithm.
The AP65200 is available in green industry
standard SO-8, SO-8EP, U-DFN2626-10
and MSOP-8EP package.
The evaluation board utilizes only the
footprint of the SO-8 and SO-8EP package.
• Gaming Consoles
• TV Sets and Monitors
• Set Top Boxes
Performance Spec of AP65200S-EVM
Parameter
Input voltage
Output Current
Output Voltage
Output Voltage Ripple
Transient Response
• Distributed Power Systems
• Home Audio
• Consumer Electronics
Conditions
Range 4.75V to 18V
Performance Value
12V
2A
3.3V
20mVp-p
140mV
Peak Deviation
Load step 1.0A/us to 2A/us
Switching Frequency
Efficiency
340kHz
93%
Figure 1. Evaluation Board
Figure 2. Efficiency vs Load Current
Efficiency Vs Load Current
Vout=3.3V
100
Efficiency (%)
95
90
5Vin
12Vin
18Vin
85
80
75
70
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Load Current (A)
AP65200
Document number: Rev. 1 - 0
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www.diodes.com
January 2013
© Diodes Incorporated
AP65200-EVM
340kHz 18V 2A Synchronous DC/DC Buck Converter
Quick Start Guide
The AP65200-EVM has a simple layout and allows access to the appropriate signals through
test points. To evaluate the performance of the AP65200, follow the procedure below:
1. Connect a power supply to the input terminals Vin and GND. Set Vin to 12V.
2. Connect the positive terminal of the electronic load to Vout and negative terminal to GND.
3. EN has a positive voltage through a 100K pull-up to Vin. No supply input is required for EN.
Note: To use the EN function drive EN above 1.3V to start the converter and below 0.4V
to stop the converter.
4. The evaluation board should now power up with a 3.3V output voltage.
5. Check for the proper output voltage of 3.3V(+/-1%) at the output terminals Vout and GND.
Measurement can also be done with a multimeter with the positive and negative leads
between Vout and GND.
6. Set the load to 1.5A through the electronic load. Check for the stable operation of the SW
signal on the oscilloscope. Measure the switching frequency. A test point is conveniently
located at the head of the inductor.
Measurement/Performance Guidelines:
1) The evaluation board has the inductor pad spaced for easy access to measure the
inductor current. As shown in the picture, a current probe can be connected to the wire
loop to measure the inductor current.
2) When measuring the output voltage ripple, maintain the shortest possible ground lengths
on the oscilloscope probe. Long ground leads can erroneously inject high frequency
noise into the measured ripple.
3) For efficiency measurements, connect an ammeter in series with the input supply to
measure the input current. Connect an electronic load to the output for output current.
AP65200
Document number: Rev. 1 - 0
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January 2013
© Diodes Incorporated
AP65200-EVM
340kHz 18V 2A Synchronous DC/DC Buck Converter
EVALUATION BOARD SCHEMATIC
EN
R4
100kΩ
1
BS
SS
8
C6
0.1µF
C1
10nF
2
VIN
4.75V TO 18V
IN
EN
C7
OPEN
R5
OPEN
7
AP65200
C2
10µF
3
C8
OPEN
SW
COMP
6
C3
6.8nF
4
GND
FB
C4
OPEN
5
R1
26.1kΩ
1%
R3
10kΩ
1%
R2
6.8kΩ
SW
L1
10µH
D1
OPEN
C5
22µF
VOUT
3.3V
C9
22µF
BILL OF MATERIALS
REF
VALUE
DESCRIPTION
PACKAGE
MANUFACTURER
MANUFACTURER P/N
C1
10nF
SM0805
AVX
08055C103KAT2A
C5,
C9
C3
22uF
1210
AVX
1210YD226KAT2A
SM0805
AVX
08055C682KAT2A
C2
10uF
1210
AVX
12103D106KAT2A
C6
0.1uF
0805
AVX
08055C104KAT2A
L1
10µh
Ceramic Capacitor,
25V,X5R
Ceramic Cap, 16V,
X5R
Ceramic Cap, 50V,
X7R
Ceramic Capacitor,
10V, X5R
Ceramic Cap, 50V,
X7R
Inductor, 5.0A
SMD
Wurth Electronics
74477110
R1
26.1K
Resistor, 1%
0603
Panasonic
CRCW060326KIFKEA
R2
6.8KΩ
Resistor, 1%
0603
Panasonic
ERJ-6GEYJ682V
R3
10.0k
Resistor, 1%
0603
Panasonic
ERJ-6ENF1002V
R4
100k
Resistor, 1%
0603
Panasonic
ERJ-6GEYJ104V
DC/DC Converter
SO-8EP
Diodes Inc
AP65200SP
6.8nF
U1
AP65200
Document number: Rev. 1 - 0
3 of 4
www.diodes.com
January 2013
© Diodes Incorporated
AP65200-EVM
340kHz 18V 2A Synchronous DC/DC Buck Converter
Top Layer
Bottom Layer
AP65200
Document number: Rev. 1 - 0
4 of 4
www.diodes.com
January 2013
© Diodes Incorporated
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