AP1530SG-13 Datasheet, PDF (1/12 Pages) Diodes Incorporated – 18V 3A 300KHz BUCK CONVERTER

Features
• Input voltage: 3.6V to 18V.
• Output voltage: 0.8V to VCC.
• Duty ratio: 0% to 100% PWM control
• Oscillation frequency: 300kHz typ.
• Current Limit, Enable function
• Thermal Shutdown function
• Built-in internal SW P-channel MOS
• Lead Free package: SOP-8L
• SOP-8L: Available in “Green” Molding Compound
(No Br, Sb) (Note 1)
• Lead Free Finish/ RoHS Compliant (Note 2)
Applications
• PCD Motherboard
• LCD Monitor
• Graphic Card
• DVD-Video Player
• Telecom Equipment
• ADSL Modem
• Printer and other Peripheral Equipment
• Microprocessor core supply
• Networking power supply
Typical Application Circuit
AP1530
18V 3A 300KHz BUCK CONVERTER
General Description
AP1530 consists of step-down switching regulator with PWM
control. These devices include a reference voltage source,
oscillation circuit, error amplifier and internal PMOS.
AP1530 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 100%. This converter also
contains an error amplifier circuit. An enable function, an over
current protection and a short circuit protection 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 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.
V_IN
Vcc
Output
R_OCSET C_OCSET
3K Option
AP 1530
C _IN
OCSET
FB
470uF
EN
V _SS
CVcc
R_EN
100K
0.1uF
C_EN
0.1uF
L1
22uH
Cc
Option
D1*
V_{OUT = 5V/3A}
R_A
6.8K
+
-
R_B
1.3K
+
C
0.1uF_-
C_OUT
470uF
V_OUT= V _FB x (1+ R_A/RB)
R_B= 0.7K~5K ohm
* Suggested DIODES Power Schottky P/N: B340 series or PDS340.
AP1530 Rev. 7
DS31092
1 of 12
www.diodes.com
NOVEMBER 2009
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