DAP005 datasheet(5/39 Pages) STMICROELECTRONICS

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DAP005

Description

5/39

6TBO

Tracking Boost function. This pin provides a buffered VFF voltage. A resistor connected

between this pin and GND defines a current that is sunk from pin INV (pin 1). In this way,

the output voltage is changed proportionally to the mains voltage (tracking boost). If this

function is not used leave this pin open.

7PFC_OK

PFC pre-regulator output voltage monitoring/disable function. This pin senses the output

voltage of the PFC pre-regulator through a resistor divider and is used for protection

purposes. If the voltage at the pin exceeds 2.5V the IC is shut down, its consumption goes

almost to the start-up level and this condition is latched. PWM_LATCH pin is asserted high.

Normal operation can be resumed only by cycling the Vcc. This function is used for

protection in case the feedback loop fails.

If the voltage on this pin is brought below 0.2V the IC is shut down and its consumption is

considerably reduced. To restart the IC the voltage on the pin must go above 0.26V. If these

functions are not needed, tie the pin to a voltage between 0.26 and 2.5 V.

8PWM_LATCH

Output pin for fault signaling. During normal operation this pin features high impedance. If

either a voltage above 2.5V at PFC_OK (pin 7) or a voltage above 1.7V on CS (pin 4) is

detected the pin is asserted high. Normally, this pin is used to stop the operation of the DC-

DC converter supplied by the PFC pre-regulator by invoking a latched disable of its PWM

controller. If not used, the pin will be left floating.

9PWM_STOP

Output pin for fault signaling. During normal operation this pin features high impedance. If

the IC is disabled by a voltage below 0.5V on AC_OK (pin 10) the voltage at the pin is

pulled to ground. Normally, this pin is used to temporarily stop the operation of the DC-DC

converter supplied by the PFC pre-regulator by disabling its PWM controller. If not used,

the pin will be left floating.

AC_OK

Brownout protection put. A voltage below 0.52V shuts down (not latched) the IC and brings

its consumption to a considerably lower level. PWM_STOP is asserted low. The IC restarts

as the voltage at the pin goes above 0.6V. Connect this pin to VFF (pin 5) either directly or

through a resistor divider to use this function as brownout (AC mains undervoltage)

protection, tie to INV (pin 1) if the function is not used.

ZCD

Boost inductor’s demagnetization sensing input for transition-mode operation. A negative-

going edge triggers MOSFET’s turn-on.

GND

Ground. Current return for both the signal part of the IC and the gate driver.

Gate driver output. The totem pole output stage is able to drive power MOSFET’s and

IGBT’s with a peak current of 600 mA source and 800 mA sink. The high-level voltage of

this pin is clamped at about 12V to avoid excessive gate voltages.

VCC

Supply Voltage of both the signal part of the IC and the gate driver.

Table 2. Pin description (continued)

Pin N°

Name

Description

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