TEA1733CT

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Product data sheet

Rev. 2 — 16 July 2013

6 of 20

NXP Semiconductors

TEA1733CT

GreenChip SMPS control IC

controller stops switching and enters Restart mode. In Restart mode, the driver output is

disabled and the VCC pin voltage is recharged via resistor R3 to the rectified mains.

7.3 Supply management

All internal reference voltages are derived from a temperature compensated on-chip band

gap circuit. Internal reference currents are derived from a trimmed and temperature

compensated current reference circuit.

7.4 Input voltage detection (VINSENSE pin)

In a typical application pin VINSENSE detects the mains input voltage. Switching does not

(typically 0.94 V).

If pin VINSENSE is left open or disconnected, the pin is pulled up by the internal 20 nA

An internal clamp of 5.2 V (typical) protects this pin from overvoltages.

7.5 Protection input (PROTECT PIN)

Pin PROTECT is a general-purpose input pin, which can be used to trigger the restart

protection. The converter is stopped when the voltage on this pin is pulled above

32

A (typical) flows out of the chip when the pin voltage is at the V

current of 107

A (typical) flows into the chip when the pin voltage is at the

Fig 4.

Start-up sequence, normal operation and restart sequence

014aaa929

starting

converter

charging VCC

capacitor

normal

operation

protection

(power down)

soft start

ISENSE

VINSENSE

PROTECT

OPTIMER

restart

soft start

4.5 V

1.2 V