Diodes AP1513 Manuel d'utilisateur

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AP1513
PWM CONTROL 2A STEP-DOWN CONVERTER
AP1513 Rev. 4 1 of 9 JULY 2009
DS31053 www.diodes.com © Diodes Incorporated
Input voltage: 3.6V to 18V
Output voltage: 0.8V to V
CC
Duty ratio: 0% to 100% PWM control
Oscillation frequency: 300KHz typ.
Soft-start, Current limit, Enable function
Thermal Shutdown function
Built-in internal SW P-channel MOS
SOP-8L: Available in “Green” Molding Compound
(No Br, Sb)
Lead Free Finish/ RoHS Compliant (Note 1)
AP1513 consists of step-down switching regulator with PWM
control. These devices include a reference voltage source,
oscillation circuit, error amplifier, and internal PMOS.
AP1513 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 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 30KHz. 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 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.
PC 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
AP1513
+
-
V
SS
EN
C
C
R
A
R
B
D1
SBR2U30P1
FB
Vcc
Output
CVcc
V
OUT
= 5V/2A
V
IN
R
OCSET
OCSET
C
OUT
C
IN
Optional
C
OCSET
C
EN
R
EN
Option
100K
Note: V
OUT
= V
FB
x (1+R
A
/R
B
)
R
B
=0.7K~5K ohm
L1
33uH
6.8K
1.3K
3K
0.1uF
+
-
C
0.1uF
470uF
470uF
0.1uF
V
IN
=12V, I
MAX
=2A
V
OUT
2.5V 3.3V 5V
L1 Value
22uH 27uH 33uH
Features
General Description
Applications
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Résumé du contenu

Page 1 - Applications

AP1513PWM CONTROL 2A STEP-DOWN CONVERTER AP1513 Rev. 4 1 of 9

Page 2 - Pin Descriptions

AP1513PWM CONTROL 2A STEP-DOWN CONVERTER AP1513 Rev. 4 2 of 9

Page 3 - Absolute Maximum Ratings

AP1513PWM CONTROL 2A STEP-DOWN CONVERTER AP1513 Rev. 4 3 of 9

Page 4 -

AP1513PWM CONTROL 2A STEP-DOWN CONVERTER AP1513 Rev. 4 4 of 9

Page 5 - AP1513 Efficiency

AP1513PWM CONTROL 2A STEP-DOWN CONVERTER AP1513 Rev. 4 5 of 9

Page 6 - Test Circuit

AP1513PWM CONTROL 2A STEP-DOWN CONVERTER AP1513 Rev. 4 6 of 9

Page 7 - OCSETOCSETDS(ON)PEAK

AP1513PWM CONTROL 2A STEP-DOWN CONVERTER AP1513 Rev. 4 7 of 9

Page 8 - Diodes Incorporated

AP1513PWM CONTROL 2A STEP-DOWN CONVERTER AP1513 Rev. 4 8 of 9

Page 9

AP1513PWM CONTROL 2A STEP-DOWN CONVERTER AP1513 Rev. 4 9 of 9

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