DAP005 datasheet(3/39 Pages) STMICROELECTRONICS

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DAP005

Description

3/39

Description

The device is a current-mode PFC controller operating in Transition Mode (TM). Based on

the core of a standard TM PFC controller, it offers improved performance and additional

functions.

The highly linear multiplier, along with a special correction circuit that reduces crossover

distortion of the mains current, allows wide-range-mains operation with an extremely low

THD even over a large load range.

The output voltage is controlled by means of a voltage-mode error amplifier and a precise

(1.5% @TJ = 25°C) internal voltage reference. The stability of the loop and the transient

response to sudden mains voltage changes are improved by the voltage feedforward

function (1/V2 correction).

Additionally, the IC provides the option for tracking boost operation (where the output

voltage is changed tracking the mains voltage). The device features extremely low

consumption (

≤ 90 µA before start-up and ≤ 5 mA running).

The device includes disable functions suitable for remote ON/OFF control both in systems

where the PFC pre-regulator works as a master and in those where it works as a slave.

In case of master PFC, they can be used as AC Brownout protection (Mains undervoltage)

In addition to an effective two-step OVP that handles normal operation overvoltages, the IC

provides also a protection against feedback loop failures or erroneous output voltage

setting.

An interface with the PWM controller of the DC-DC converter supplied by the PFC pre-

regulator is provided: the purpose is to stop the operation of the converter in case of

anomalous conditions for the PFC stage (feedback loop failure, boost inductor's core

saturation) and to disable the PFC stage in case of light load for the DC-DC converter, so as

to make it easier to comply with energy saving norms (Blue Angel, EnergyStar, Energy2000,

etc.).

Figure 2.

Typical system block diagram

Vinac

Voutdc

PWM is turned off in case of PFC’s

anomalous operation for safety

PFC can be turned off at light

load to ease compliance with

energy saving regulations.

DAP005

PWM or

Resonant

CONTROLLER

PFC PRE-REGULATOR

DC-DC CONVERTER

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