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PDF AP1539 Data sheet ( Hoja de datos )
| Número de pieza | AP1539 | |
| Descripción | 18V 4A 300KHz BUCK CONVERTER | |
| Fabricantes | Diodes Incorporated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AP1539 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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Features
AP1539
18V 4A 300KHz BUCK CONVERTER
www.DataSheet4U.com
General Description
• Input voltage: 3.6V to 18V
• Output voltage: 0.8V to VCC
• Output current: up to 4A
• Duty ratio: 0% to 99% PWM control
• Oscillation frequency: 300KHz typ.
• Soft-start like, Current limit and Enable function
• Thermal Shutdown function
• Built-in internal SW P-channel MOS
• SOP-8L-DEP: Available in “Green” Molding Compound
(No Br, Sb)
• Lead Free Finish / RoHS Compliant (Note 1)
AP1539 consists of step-down switching regulator with PWM
control. These devices include a reference voltage source,
oscillation circuit, error amplifier, internal PMOS.
AP1539 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-DEP mini-package, 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.
Applications
• PC Motherboard
• LCD Monitor
• Graphic Card
• DVD-Video Player
• Telecom Equipment
• ADSL Modem
• Printer and other Peripheral Equipment
• Microprocessor core supply
Typical Application Circuit
VIN Vcc Output
ROCSET COCSET
3.9K Option
AP 1539
C IN
OCSET
FB
470uF
CVcc
REN
100K
EN
V SS
0.1uF
CEN
0.1uF
L1
22uH
Cc
Option*
D1**
VOUT = 5V/4A
RA
6.8K
+
-
RB
1.3K
+
C
0.1uF-
COUT
470uF***
Notes:
VOUT= V FB x (1+ RA/RB)
RB= 0.7K~5K ohm
* Typical feedback compensation (Cc): 5600pF.
** Suggested DIODES Power Schottky P/N: B540 series or PDS540.
*** Suggested COUT for VOUT < 1V; 680uF.
AP1539 Rev. 4
DS31477
1 of 13
www.diodes.com
OCTOBER 2009
© Diodes Incorporated
1 page  
Electrical Characteristics
AP1539
18V 4A 300KHz BUCK CONVERTER
www.DataSheet4U.com
(VIN = 12V, TA = 25°C, unless otherwise specified)
Symbol
Parameter
Conditions
VFB
IFB
ISHDN
Feedback Voltage
Feedback Bias Current
Current Consumption During
Power Off
IOUT = 0.1A
IOUT = 0.1A
VEN = 0V
∆VOUT
/ VIN
Line Regulation
VIN = 5V~18V
∆VOUT
/ VOUT
fOSC
fOSC1
Load Regulation
IOUT = 0.1 to 4A
Oscillation Frequency
Measure waveform at SW pin
Frequency of Current Limit or
Short Circuit Protection
Measure waveform at SW pin
VIH
VIL
EN Pin Input Voltage
Evaluate oscillation at SW pin
Evaluate oscillation stop at SW pin
ISH
ISL
EN
Pin
Input
Leakage
Current
EN
EN
Pin
Pin
High
Low
IOCSET OCSET Pin Bias Current
--
RDS(ON) Internal MOSFET RDS(ON)
VIN = 5V, VFB = 0V
VIN = 12V, VFB = 0V
EFFI Efficiency
VIN = 12V, VOUT = 5V
IOUT = 4A
TSHDN Thermal shutdown threshold
THYS Thermal shutdown hysteresis
θJC
Thermal Resistance
Junction-to-Case
SOP-8L-DEP (Note 5)
Min
0.784
-
-
-
-
240
-
2.0
-
-
-
75
-
-
-
-
-
-
Typ.
0.8
0.1
10
1
0.2
300
50
-
-
20
-10
90
90
50
92
150
55
26
Max
0.816
0.5
-
Unit
V
µA
µA
2%
0.5 %
400 KHz
- KHz
-
0.8
V
- µA
- µA
105 µA
-
-
mΩ
-%
- °C
- °C
- oC/W
Notes: 5. Test condition for SOP-8L-DEP: Devices mounted on 2oz copper, minimum recommended pad layout on top & bottom layer with thermal vias,
double sided FR-4 PCB.
AP1539 Rev. 4
DS31477
5 of 13
www.diodes.com
OCTOBER 2009
© Diodes Incorporated
5 Page 
Functional Description (Continued)
AP1539
18V 4A 300KHz BUCK CONVERTER
www.DataSheet4U.com
VIN Vcc Output
C7
R4 Option
AP1539
C2
OCSET
FB
C3 R5
EN VSS
C6
L1
C1
Option
D1
VOUT
R1
++
C8 C4
-
R2
-
Figure: Layout numbering comparison.
Marking Information
(1) SOP-8L-DEP
Logo
Part No.
( Top View )
85
AP1539
YY WW X X E
14
G : Green
YY : Year : 08, 09,10~
WW : Week : 01~52; 52
represents 52 and 53 week
X : Internal Code
SOP-8L-DEP
AP1539 Rev. 4
DS31477
11 of 13
www.diodes.com
OCTOBER 2009
© Diodes Incorporated
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AP1539.PDF ] | |
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