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APW7026

Anpec Electronics Coropration
Part Number APW7026
Manufacturer Anpec Electronics Coropration
Description Advanced PWM and Dual Linear Power Controllers
Published Nov 17, 2008
Detailed Description APW7026 Advanced PWM and Dual Linear Power Control Features • 3 Regulated Voltage are provided • SYNC Switching Power f...
Datasheet PDF File APW7026 PDF File

APW7026
APW7026

Overview
APW7026 Advanced PWM and Dual Linear Power Control Features • 3 Regulated Voltage are provided • SYNC Switching Power for VTT(1.
25V) • ASYNC Switching Power for NVVDD(2.
05V) • Linear Regulator for FBVDDQ(2.
5V) www.
DataSheet4U.
com General Description The APW7026 Provides the power control and protection for three output voltages in VGA Card applications.
It integrates two PWM controllers, one linear controller as well as the monitoring and protection functions into a single package.
One PWM controller (PWM1) regulates the termination voltage VTT(1.
25V) with a synchronous-rectified buck converter.
The second PWM controller (PWM2) supplies the Core power NVVDD ( 2.
05V ) with a standard buck converter .
The linear controller regulates 2.
5V power for FBVDDQ.
The APW7026 can monitor all the output voltages (VTT ,NVVDD,FBVDDQ) and a single power good signal is issued when the VTT is within ± 10% of the reference voltage (VREF1) and the other levels are above its lower power good threshold voltage.
Additional built-in overvoltage protection (OVP) will be started when the VTT output is above 118% of the VREF1.
The OVP function will shutdown the upper MOSFET and turn on the lower MOSFET until the over-voltage is disappeared.
The PWM controllers over-current function monitors the output current by sensing the voltage drop across the upper MOSFET rDS(ON), eliminating the need for a current sensing resistor.
• • Simple Single-Loop Control Design • Voltage-Mode PWM Control Excellent Output Voltage Regulation • VTT Output: : ±1% Over Temperature : ±2% Over Temperature • NVVDD Output: • FBVDDQ Output:±2.
5% Over Temperature • Fast Transient Response • On-Chip Feedback Compensation • Full 0% to 100% Duty Ratio • Power-Good Output Voltage Monitor • Over-Voltage and Over-Current Fault Monitors • Small Converter Size • Constant Frequency Operation(200kHz) • Programmable Oscillator from 50kHz to 800KHz • Reduce External Component Count Pin Description UGATE 1 1 2 3 4 5 6 7 8 9 20 ...


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