APW7073 Datasheet, PDF (1/25 Pages) Anpec Electronics Coropration – Synchronous Buck PWM Controller

APW7073
Features
• Single 12V Power Supply Required
• 0.6V Reference with 1% Accurate
• Shutdown and Soft-start Function
• Programmable Frequency Range
from 50 kHz to 1000kHz
• Voltage Mode PWM Control Design
• Up to 100% Duty Cycle
• Under-Voltage Protection
• Over-Current Protection
• SOP-14, QFN-16 Packages
• Lead Free Available (RoHS Compliant)
Applications
• Graphic Cards
Synchronous Buck PWM Controller
General Description
The APW7073 is voltage mode, synchronous PWM
controller which drives dual N-channel MOSFETs. The
device integrates all of the control, monitoring and
protecting functions into a single package, provides
one controlled power output with under-voltage and
over-current protections.
The APW7073 provides excellent regulation for
output load variation. The internal 0.6V temperature-
compensated reference voltage is designed to meet
the requirement of low output voltage applications.
The device includes a 200kHz free-running triangle-wave
oscillator that is adjustable from 50kHz to 1000kHz.
The APW7073 with excellent protection functions:
POR, OCP and UVP. The Power-On-Reset (POR)
circuit can monitor the VCC, EN, and OCSET voltage
to make sure the supply voltage exceeds their
threshold voltage while the controller is running.
The Over-Current Protection (OCP) monitors the output
current by using the voltage drop across the upper
and lower MOSFET’s R_DS(ON). When the output current
reaches the trip point, the controller will run the soft-
start function until the fault events are removed. The
Under-Voltage Protection (UVP) monitors the voltage
at FB pin (V ) for short-circuit protection, when the
FB
V is less than 50% of V , the controller will shut-
FB
REF
down the IC directly.
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
1
Rev. A.1 - Apr., 2006
www.anpec.com.tw