APW7073
Synchronous Buck PWM Controller
Features
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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)
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 APW 7073 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:
Applications
•
Graphic Cards
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’ R
DS(ON)
. When the output current
s
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
FB
) for short-circuit protection, when the
V
FB
is less than 50% of V
REF
, the controller will shut-
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.
Rev. A.1 - Apr., 2006
1
www.anpec.com.tw
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
