TEA1742T datasheet(9/17 Pages) PHILIPS

Part #	TEA1742T

Description	GreenChip PFC controller

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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9 / 17 page

TEA1742T_1

Objective data sheet

Rev. 01 — 10 February 2009

9 of 17

NXP Semiconductors

TEA1742T

GreenChip PFC controller

7.2.7 Overcurrent protection (PFCSENSE pin)

The maximum peak current is limited cycle-by-cycle by sensing the voltage across an

external sense resistor, RSENSE1, on the source of the external MOSFET. The voltage is

measured via the PFCSENSE pin.

7.2.8 Mains undervoltage lockout / brownout protection (VINSENSE pin)

To prevent the PFC from operating at very low mains input voltages, the voltage on the

VINSENSE pin is sensed continuously. As soon as the voltage on this pin drops below the

Vstop(VINSENSE) level, switching of the PFC is stopped.

The voltage on pin VINSENSE is clamped to a minimum value,

Vstart(VINSENSE) + ∆Vpu(VINSENSE), for a fast restart as soon as the mains input voltage is

restored after a mains dropout.

7.2.9 Overvoltage protection (VOSENSE pin)

To prevent output overvoltage during load steps and mains transients, an overvoltage

protection circuit is built in.

As soon as the voltage on the VOSENSE pin exceeds the Vovp(VOSENSE) level, switching of

the power factor correction circuit is inhibited. Switching of the PFC recommences as

soon as the VOSENSE pin voltage drops below the VOVP(VOSENSE) level again.

When the resistor between pin VOSENSE and ground is open, the overvoltage protection

is also triggered.

7.2.10 PFC open-loop protection (VOSENSE pin)

The power factor correction circuit does not start switching until the voltage on the

VOSENSE pin is above the Vth(ol)(VOSENSE) level. This protects the circuit from open-loop

and VOSENSE short situations.

7.2.11 Driver (pin PFCDRIVER)

The driver circuit to the gate of the power MOSFET has a current sourcing capability of

typically

−500 (TBF) mA and a current sink capability of typically 1.2 (TBF) A. This permits

fast turn-on and turn-off of the power MOSFET for efﬁcient operation.

8.

Limiting values

Table 3.

Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134).

Symbol

Parameter

Conditions

Min

Max

Unit

Voltages

VCC

supply voltage

−0.4

+38

V

VPFCCOMP

voltage on pin PFCCOMP

−0.4

+5

V

VVINSENSE voltage on pin VINSENSE

−0.4

+5

V

VVOSENSE

voltage on pin VOSENSE

−0.4

+5

V

VPFCAUX

voltage on pin PFCAUX

−25

+25

V

VPFCSENSE voltage on pin PFCSENSE

current limited

−0.4

+5

V

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