AP1511 Datasheet, PDF (1/5 Pages) Anachip Corp – PWM Control 5A Step-Down Converter

PWM Control 5A Step-Down Converter
AP1511
„ Features
- Input voltage: 3.6V to 23V.
- 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-16L Pb-Free Package.
„ Applications
-Microprocessor core supply
-Networking power supply
-LCD MNT, TV power supply
-Telecom power supply
„ Pin Assignments
„ General Description
AP1511 consists of step-down switching regulator
with PWM control. These devices include a reference
voltage source, oscillation circuit, error amplifier,
internal PMOS and etc.
AP1511 provides low-ripple power, high efficiency,
and excellent transient characteristics. The PWM
control circuit is able to very 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-16L
mini-package, providing such outstanding features as
low current consumption. Since this converter can
accommodate an input voltage up to 23V, it is also
suitable for the operation via an AC adapter.
„ Pin Descriptions
(Top View)
GND 1
GND 2
FB 3
EN 4
OCSET 5
Vcc 6
Output 7
Output 8
AP1511
16 GND
15 _GND
14 _(Comp)
13 Vref
12 V_C
11 PVcc
10 Output
9 Output
SOP- 16L
Pin Pin
Name No.
Description
GND 1 GND pin
GND 2 GND pin
FB 3 Feedback pin
EN
4
H: Normal operation
L: Step-down operation stopped
OCSET
5
Add an external resistor to set max
output current.
Vcc 6 Signal Vcc
Output 7 Switch output pin
Output 8 Switch output pin
Output 9 Switch output pin
Output 10 Switch output pin
PVcc 11 Power Vcc
V_C 12 Voltage clamp pin
Vref 13 Reference voltage
(Comp) 14 Option for comp
GND 15 GND pin
GND 16 GND pin
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev. 1.1 Mar 4, 2005
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