 English |
|
|
|
|
|
|
|
| AP1513_09 Datasheet, PDF (1/9 Pages) Diodes Incorporated – PWM CONTROL 2A STEP-DOWN CONVERTER | |||
| |||
|
AP1513
PWM CONTROL 2A STEP-DOWN 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.
⢠Soft-start, Current limit, Enable function
⢠Thermal Shutdown function
⢠Built-in internal SW P-channel MOS
⢠SOP-8L: Available in âGreenâ 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
⢠Networking power supply
Typical Application Circuit
General Description
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
SOPâ8L 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.
VIN
Vcc
Output
R OCSET COCSET
3K Option
AP1513
CIN
OCSET
FB
470uF
EN
C Vcc
REN
100K
VSS
0.1uF
CEN
0.1uF
L1
33uH
CC
Optional
D1
SBR2U30P1
VOUT= 5V/2A
RA
6.8K
+C +
- 0.1uF-
RB
1.3K
COUT
470uF
VOUT
L1 Value
Note: VOUT = VFB x (1+RA/RB)
RB =0.7K~5K ohm
VIN = 12V, IMAX = 2A
2.5V
3.3V
22uH
27uH
5V
33uH
AP1513 Rev. 4
DS31053
1 of 9
www.diodes.com
JULY 2009
© Diodes Incorporated
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese