Custom Data

This is a document intended for a specific Customer. It must not be released without first contacting Division marketing.

February 2007

Rev 1

1/39

39

DAP005

Advanced transition-mode PFC controller

Features

■ Transition-mode control of PFC pre-regulators

■ Very precise adjustable output overvoltage

protection

■ Tracking boost function

■ Protection against feedback loop failure

(Latched shutdown)

■ Interface for cascaded converter's PWM

controller

■ Input voltage feedforward (1/V2)

■ AC brownout protection

■ Low (≤ 90µA) start-up current

■ < 5mA quiescent current

■ 1.4% (@ TJ = 25°C) internal reference voltage

■ -600/+800 mA totem pole gate driver with

active pull-down during UVLO

■ SO14 package

Applications

PFC pre-regulators for:

■ HI-END AC-DC adapter/charger

■ Desktop PC, server, WEB server

■ IEC61000-3-2 OR JEIDA-MITI compliant

SMPS, in excess of 250W

Table 1. Device summary

Part number

Package

Packaging

DAP005

SO-14

Tube

DAP005TR

SO-14

Tape & Reel

SO-14

www.st.com

Figure 1.

Block diagram

+

-

VREF2

Vbias

(INTERNAL SUPPLY BUS)

+

-

2.5V

R1

R2

+

-

ZERO CURRENT

DETECTOR

VCC

14

12

3

4

ZCD

VCC

INV

COMP

MULT

CS

GD

13

11

GND

12

MULTIPLIER

R

S

Q

STARTER

1.7V

+

-

6

TBO

2.5V

PFC_OK

7

1:1

CURRENT

MIRROR

-

AC_OK

10

0.52V

0.6V

PWM_LATCH

8

5

VFF

LEADING-EDGE

BLANKING

1:1

BUFFER

from

VFF

1.4V

0.7V

PWM_STOP

9

Vbias

UVLO

COMPARATOR

0.2V

0.26V

15 V

SAT

DISABLE

LATCH

UVLO

3V

SAT

Ideal diode

1 / V 2

Starter

OFF

Driver

Q

TRACKING

BOOST

ON/OFF CONTROL

(BROWNOUT DETECTION)

LINE VOLTAGE

FEEDFORWARD

INDUCTOR

SATURATION

DETECTION

FEEDBACK

FAILURE

PROTECTION

VOLTAGE

REGULATOR

Voltage

references