APW7074 Datasheet, PDF (1/20 Pages) Anpec Electronics Coropration – Synchronous Buck PWM Controller

APW7074
Synchronous Buck PWM Controller
Features
General Description
• Single 12V Power Supply Required
• 0.8V Reference with 1% Accuracy
• Shutdown and Soft-start Function
• 300KHz Fixed Switching Frequency
• Voltage Mode PWM Control Design
• Up to 100% Duty Cycle
• Under-Voltage Protection
• Over-Current Protection
• SOP-14 Package
• Lead Free Available (RoHS Compliant)
Applications
• Graphic Cards
The APW7074 uses fixed 300KHz switching frequency,
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 APW7074 provides excellent regulation for
output load variation. The internal 0.8V temperature-
compensated reference voltage is designed to meet
the requirement of low output voltage applications.
The APW7074 with excellent protection functions:
POR, OCP and UVP. The Power-On-Reset (POR) cir-
cuit 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 out-
put current by using the voltage drop across the upper
and lower MOSFET’s R_DS(ON). When the output cur-
rent 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 volt-
age at FB pin (V_FB) for short-circuit protection, when
the V is less 50% V , the controller will shutdown
FB
REF
the IC directly.
Pin Outs
NC 1
OCSET 2
SS 3
COMP ⁴
FB 5
EN 6
GND 7
14 V CC
13 PV CC
12 LGA TE
11 PGND
10 BOOT
9 UGA TE
8 PHASE
SOP-14
TOP V IEW
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.2 - Feb., 2006
www.anpec.com.tw