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TEA1751T_LT_2
?NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02  23 December 2009
11 of 29
NXP Semiconductors
TEA1751T; TEA1751LT
GreenChip III SMPS control IC
 
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, R
SENSE1
, 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
V
stop(VINSENSE)
 level, switching of the PFC is stopped.
The voltage on pin VINSENSE is clamped to a minimum value,
V
start(VINSENSE)
+ 擵
pu(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 V
ovp(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 V
ovp(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 V
th(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.
Fig 6.    Voltage to current transfer function for dual boost PFC
V
VINSENSE
I
I(VOSENSE)
014aaa097
15 糀
2.2 V
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