AP1509-EVM

AP1509-EV
Application Note
AP1509 Application Information and Demo Board User Guide
Contents
1. Description
2. Schematic
3. PCB Layout
4. Bill of Materials
5. Vendors of peripheral components
This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability is
assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
1/3
Rev. A
Apr. 2011
www.diodes.com
 Diodes Incorporated
AP1509-EV
Application Note
AP1509 Application Information and Demo Board User Guide
1. Description
The AP1509 are a fully integrated step-down DC/DC converter, with the ability to drive 2A
load without the need of additional driver components. The AP1509 operates at a switching
frequency of 150KHZ enabling the use of small size filter components. As a result, board
space is reduced and BOM costs are lowered.
2. EVM Schematic
Figure 1. AP1509 schematic
VOUT = VFB * (1+R2/R3)
VFB=1.23V
R3 = 1K ~ 3K
3. Board Layout
Top Layer
Bottom Layer
This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability is
assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
2/3
Rev. A
Apr. 2011
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 Diodes Incorporated
AP1509-EV
Application Note
AP1509 Application Information and Demo Board User Guide
4. Bill of Materials
Component
Location
C1,C3
C2,C7
Qty
Value
Source
Part No.
Size
2
2
Aluminum Cap 470uF/25V
Cap MLCC 0.1uF/50V/X5R
TEAPO
TAIYO YUDEN
UMK212BJ104KG-T
10X15
C0805
L1
1
47uH/3A
Wurth Electronics
7447 series
12X12X8mm
R4
D1
1
1
Diodes
B340
R0805
SMC
U1
1
Diodes
AP1509
SOP-8L
Vin, Vout
4
-
-
2X2X13mm
PCB
1
Short
Schottky diode 40V/3A
150KHz, 2A PWM buck
converter
HEADER_1
AP1501/6/9/18/19 Buck
Regulator V1.1
Diodes Inc.
TDB0007
2160X1540mil
The recommended components for adjustable output versions:
:
VOUT(V)
R2(kΩ, 1%)
R3(kΩ, 1%)
L1(µH)
2.5
1
1
39
3.3
5
3
47
5
3
1
47
12
13
1.5
47
The recommended components for fixed output versions:
:
VOUT(V)
R2(kΩ, 1%)
R3(kΩ, 1%)
L1(µH)
3.3
Short
NC
47
5
Short
NC
47
12
Short
NC
47
5. Vendors of peripheral components
:
Suggested Capacitors for C1 and C3
Vendor
Capacitance
TEAPO
Aluminum Cap 470uF/25V
Suggested Capacitors for C2 and C7
Type
DIP
Series
Vendor
TAIYO YUDEN
Suggested Resistor
Type
SMD
Series
UMK212BJ104KG-T
:
:
Capacitance
Cap MLCC 0.1uF/50V/X5R
Vendor
YAGEO
Suggested Inductor
Type
SMD
Series
RC0805FR-SK
Vendor
Wurth Electronics
Type
SMD
Series
7447 series
:
This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without notice. No liability is
assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
3/3
Rev. A
Apr. 2011
www.diodes.com
 Diodes Incorporated
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