|
|
PDF AP1538 Data sheet ( Hoja de datos )
| Número de pieza | AP1538 | |
| Descripción | 18V 3A 300KHz BUCK CONVERTER | |
| Fabricantes | Diodes Incorporated | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AP1538 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
|
No Preview Available !
AP1538
18V 3A 300KHz BUCK CONVERTER
Features
•
•
•
•
•
•
•
•
www.DataSheet4U.co• m
•
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 (Note 1)
Applications
• PC Motherboard
• LCD Monitor
• Graphic Card
• DVD-Video Player
• Telecom Equipment
• ADSL Modem
• Printer and other Peripheral Equipment
• Microprocessor core supply
General Description
AP1538 consists of step-down switching regulator with PWM
control. These devices include a reference voltage source,
oscillation circuit, error amplifier, internal PMOS.
AP1538 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, an over
current protect function and a short circuit protect function are built
inside, 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 minimum external component
count.
With the addition of an internal P-channel Power MOS, a coil,
capacitors, and a diode connected externally, these ICs can
function as step-down switching regulators. They serve as ideal
power supply units for portable devices when coupled with the
SOP-8L and SOP-8L-DEP mini-packages, providing such
outstanding features as low current consumption. Since this
converter can accommodate an input voltage up to 18V, it is also
suitable for the operation via an AC adapter.
Ordering Information
AP 1538 XXX G - X
Package
S : SOP-8L
SDP : SOP-8L-DEP
Lead Free
G : Green
Packing
U : Tube
13 : Tape & Reel
Device
AP1538SG-U
AP1538SG-13
AP1538SDPG-U
AP1538SDPG-13
Package
Code
S
S
SDP
SDP
Packaging
(Note 2)
SOP-8L
SOP-8L
SOP-8L-DEP
SOP-8L-DEP
Tube
Quantity Part Number
Suffix
100 -U
NA NA
100 -U
NA NA
13” Tape and Reel
Quantity
Part Number
Suffix
NA NA
2500/Tape & Reel
-13
NA NA
2500/Tape & Reel
-13
Notes:
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes.
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
AP1538 Rev. 2
1 of 14
www.diodes.com
JUNE 2008
© Diodes Incorporated
1 page  
Typical Application Circuit
AP1538
18V 3A 300KHz BUCK CONVERTER
VIN
www.DataSheet4U.com
Vcc Output
C IN
470uF
ROCSET COCSET
3K Option
CVcc
0.1uF
REN
100K
CEN
0.1uF
AP 1538
OCSET
EN
FB
V SS
VOUT =V FB x (1+ RA/RB)
R B= 0.7K~5 K ohm
Notes:
6. Suggested DIODES Power Schottky P/N: B340 series or PDS340.
7. Suggested COUT for VOUT < 1V; 680μF.
8. Typical feedback compensation (Cc): 5600pF.
L1
22uH
Cc
Option
(Note 8)
D1
(Note 6)
VOUT = 5V/3A
RA
6.8K
+
-
RB
1.3K
C+
0.1uF-
COUT
470uF
(Note 7)
AP1538 Rev. 2
5 of 14
www.diodes.com
JUNE 2008
© Diodes Incorporated
5 Page 
AP1538
18V 3A 300KHz BUCK CONVERTER
Functional Description (Continued)
VIN
www.DataSheet4U.com C2
Vcc Output
R4
C3
C7
Option
AP1538
OCSET
FB
EN VSS
R5
C6
L1
C1
Option
D1
VOUT
R1
++
C8 C4
-
R2
-
Figure: Layout numbering comparison.
AP1538 Rev. 2
11 of 14
www.diodes.com
JUNE 2008
© Diodes Incorporated
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AP1538.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AP1530 | PWM CONTROL 3A STEP-DOWN CONVERTER | Diodes Incorporated |
| AP1533 | PWM CONTROL 1.8A STEP-DOWN CONVERTER | Diodes Incorporated |
| AP1534 | PWM CONTROL 2A STEP-DOWN CONVERTER | Diodes Incorporated |
| AP1537 | PWM Control 3A Step-Down Converter |  Anachip |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |