AP6503-EVM

AP6503-EVM
340kHz 23V 3A Synchronous DCDC Buck Converter
Description
The AP6503 is a 340kHz switching
frequency
external
compensated
synchronous DCDC buck converter. It has
integrated low RDSON high and low side
MOSFETs.
The AP6503 is available in a standard
Green SO-8EPpackage with exposed PAD
for improved thermal performance and is
RoHS compliant.
The AP6503 enables continues load current
of up to 3A with efficiency as high as 95%.
The AP6503 features current mode control
operation, which enables fast transient
response times and easy loop
stabilization.
• Gaming Consoles
• TV sets and Monitors
• Set Top Boxes
Performance Spec of AP6503SPG-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 23V
Peak Deviation
Load step 1.5A/us to 3A/us
Switching Frequency
Efficiency
Figure 1. Evaluation Board
AP6503
Document number: Rev. 1 - 0
Performance Value
12V
3A
3.3V
20mVp-p
190mV
340kHz
90%
Figure 2. Efficiency vs Load Current
1 of 4
www.diodes.com
August 2011
© Diodes Incorporated
AP6503-EVM
340kHz 23V 3A Synchronous DCDC Buck Converter
Quick Start Guide
The AP6503-EVM has a simple layout and allows access to the appropriate signals through test
points. To evaluate the performance of the AP6503, 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.
AP6503
Document number: Rev. 1 - 0
2 of 4
www.diodes.com
August 2011
© Diodes Incorporated
AP6503-EVM
340kHz 23V 3A Synchronous DCDC Buck Converter
EVALUATION BOARD SCHEMATIC
BILL OF MATERIALS
QTY
REF
VALUE
DESCRIPTION
PACKAGE
MANUFACTURER
MANUFACTURER
P/N
1
C1
10nF
Ceramic Capacitor,
25V,X5R
SM0805
AVX
08055C103KAT2A
2
C2
22uF
1210
AVX
1210YD226KAT2A
3
C3
6.8nF
Ceramic Cap, 16V,
X5R
Ceramic Cap, 50V,
X7R
SM0805
AVX
08055C682KAT2A
4
C5
47uF
Ceramic Capacitor,
10V, X5R
1210
AVX
5
C6
0.1uF
Ceramic Cap, 50V,
X7R
0805
AVX
GRM32ER61A476
KE20L
08055C104KAT2A
6
L1
10µh
Inductor, 5.0A
SMD
Wurth Electronics
74477110
7
R1
26.1K
Resistor, 1%
0603
Panasonic
8
R2
6.8KΩ
Resistor, 1%
0603
Panasonic
CRCW060326KIFK
EA
ERJ-6GEYJ682V
9
R3
10.0k
Resistor, 1%
0603
Panasonic
ERJ-6ENF1002V
10
R4
100k
Resistor, 1%
0603
Panasonic
ERJ-6GEYJ104V
11
U1
DC/DC Converter
SOP-8LEP
Diodes Inc
AP6503
AP6503
Document number: Rev. 1 - 0
3 of 4
www.diodes.com
August 2011
© Diodes Incorporated
AP6503-EVM
340kHz 23V 3A Synchronous DCDC Buck Converter
TOP SILK LAYER
TOP LAYER
BOTTOM LAYER
AP6503
Document number: Rev. 1 - 0
4 of 4
www.diodes.com
August 2011
© Diodes Incorporated
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