APW7026-12KC-TUL 데이터 시트보기 (PDF) - Anpec Electronics

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APW7026-12KC-TUL

Advanced PWM and Dual Linear Power Controllers

Anpec Electronics 

APW7026

Features

Advanced PWM and Dual Linear Power Control

General Description

• 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)

• Simple Single-Loop Control Design

• Voltage-Mode PWM Control

• Excellent Output Voltage Regulation

• VTT Output:: ±1% Over Temperature

• NVVDD Output:: ±2% Over Temperature

• 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

Applications

• VGA Card Power Regulation

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 out-

put current by sensing the voltage drop across the

upper MOSFET rDS(ON), eliminating the need for a

current sensing resistor.

Pin Description

UGATE 1 1

VCC 2

UGATE 2 3

PHASE2 4

PG OOD 5

OCSET2 6

FB2 7

V5 8

SS 9

FAULT/RT 10

20 PHASE1

19 LGATE 1

18 PG ND

17 OCSET1

16 VSE N1

15 FB1

14 FB3

13 GATE

12 GND

11 V3.3

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 - Sep., 2001

www.anpec.com.tw

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