AP1538_9-EVM

AP1538 Evaluation Module
3A/18V, 300kHz Buck Converter
Device Features
Description
•
•
•
•
•
•
•
•
•
AP1538 is a step-down switching regulator with PWM
control. It provides low-ripple power, high efficiency,
and excellent transient characteristics. The PWM
control circuit is able to vary the duty ratio linearly
from 0 up to 99%. This converter also contains an
error amplifier circuit as well as a soft-start circuit that
prevents overshoot at startup. An enable function,
over current protection and short circuit protection
are built-in, and when OCP or SCP happens, the
operation frequency will be reduced from 300KHz to
50KHz. Also, an internal compensation block is built
in to minimize external component count.
•
Input voltage : 3.6V to 18V
Output voltage : 0.8V to VCC
Output current : up to 3A
Duty ratio: 0% to 99% PWM control
Oscillation frequency: 300KHz typical
Soft-start like, Current limit and Enable function
Thermal Shutdown function
Built-in internal SW P-channel MOS
SOP-8L and SOP-8L-DEP: Available in “Green”
Molding Compound (No Br, Sb)
Lead-Free Finish / RoHS Compliant
With an internal P-channel Power MOS, coupled with
the SOP-8L and SOP-8L-DEP mini-packages, these
step-down switching regulators can serve as ideal
power supply units for portable devices. Since this
converter can accommodate an input voltage up to
18V, it is also suitable for the operation via an AC
adapter.
EVM Features
•
•
•
Input voltage : 6V to 18V
Output voltage : 5.0V
Output current : up to 3A
Ordering Information
Device
Package Code
Packaging
AP1538SG
AP1538SDPG
S
SDP
SOP-8L
SOP-8L-DEP
AP1538-EVM Rev. 0.1
1 of 5
www.diodes.com
EVM Part Number
DECEMBER 2008
© Diodes Incorporated
AP1538 Evaluation Module
3A/18V, 300kHz Buck Converter
Schematic
AP1538-EVM Schematic
AP1538-EVM Rev. 0.1
2 of 5
www.diodes.com
DECEMBER 2008
© Diodes Incorporated
AP1538 Evaluation Module
3A/18V, 300kHz Buck Converter
PCB Layout
Top Layer Layout of AP1538-EVM
Bottom Layer Layout of AP1538-EVM
AP1538-EVM Rev. 0.1
3 of 5
www.diodes.com
DECEMBER 2008
© Diodes Incorporated
AP1538 Evaluation Module
3A/18V, 300kHz Buck Converter
Bill of Material
Bill of Material for AP1538 EVM
Ref
Count
C1
1
C2
1
C3, C6, C9, C10
4
C4
1
C5
1
C7
1
C8
1
R1
1
R2
1
R3
1
R4
1
R5
1
L1
1
D1
1
U1
1
Size
0805
TH
0805
TH
0805
0805
0805
0805
0603
0603
0603
0603
TH
SMA
SOP8
Mfr
STD
STD
STD
STD
STD
STD
STD
STD
STD
STD
STD
STD
Part Number
STD
STD
STD
STD
STD
STD
STD
STD
STD
STD
STD
STD
Diodes
Diodes
B340A
AP1538
Description
Not populated
470 µF electrolytic capacitor
0.1 µF ceramic capacitor
470 µF electrolytic capacitor
Not populated
0.01 µF ceramic capacitor
0.1 µF ceramic capacitor
6.8 kΩ resistor
1.3 kΩ resistor
Not populated
20 kΩ resistor
100 kΩ resistor
22 µH inductor
3A/40V Schottky diode
3A/18V 300kHz Buck converter
I/O Terminals and Test Points
Terminals and Jumpers for AP1538 EVM
I/O and Test Points
Description
Comments
VIN, GND
VOUT, GND
Input and Ground
Connect to input power supply
Output and Ground
OFF
Enable jumper
Connect to load
Open to enable the operation; Place a shunt to
disable the device
AP1538-EVM Rev. 0.1
4 of 5
www.diodes.com
DECEMBER 2008
© Diodes Incorporated
AP1538 Evaluation Module
3A/18V, 300kHz Buck Converter
Quick Start Guide
1. Leave the Enable jumper open.
2. Connect a +12V power supply between the VIN and GND terminals. Make sure the power supply
is turned off.
3. Connect an adjustable current or resistive load to the OUT and GND terminals.
4. Turn on the power supply. Measure the output voltage. Vout should be about 5V.
5. Increase the load current and monitor the output voltage.
6. Vary the input voltage between 6V and 18V and monitor the output voltage.
AP1538-EVM Rev. 0.1
5 of 5
www.diodes.com
DECEMBER 2008
© Diodes Incorporated
Similar pages