TEA1751(L)T 데이터 시트보기 (PDF) - NXP Semiconductors.

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TEA1751(L)T

HV start-up DCM/QR flyback controller with integrated DCM/QR PFC controller

NXP Semiconductors. 

NXP Semiconductors

TEA1751T; TEA1751LT

GreenChip III SMPS control IC

2.2 V

VVINSENSE

−15 μA

II(VOSENSE)

014aaa097

Fig 6. Voltage to current transfer function for dual boost PFC

7.2.8 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.

7.2.9 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) + ΔVpu(VINSENSE), for a fast restart as soon as the mains input voltage is

restored after a mains dropout.

7.2.10 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.

7.2.11 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.

7.2.12 Driver (pin PFCDRIVER)

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

typically −500 mA and a current sink capability of typically 1.2 A. This permits fast turn-on

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

TEA1751T_LT_2

Product data sheet

Rev. 02 — 23 December 2009

© NXP B.V. 2009. All rights reserved.

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