TEA1733CT

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Product data sheet

Rev. 2 — 16 July 2013

7 of 20

NXP Semiconductors

TEA1733CT

GreenChip SMPS control IC

The PROTECT input can be used to create overvoltage detection and OTP functions.

A small capacitor can be connected to the pin if the protections on this pin are not used.

An internal clamp of 4.1 V (typical) protects this pin from overvoltages.

7.6 Duty cycle control (CTRL pin)

Pin CTRL regulates the output power of the converter. This pin is connected to an internal

5.4 V supply using an internal 7 k

 resistor.

The CTRL pin voltage sets the peak current which is measured using the ISENSE pin

(see Section 7.10). At a low output power the switching frequency is also reduced (see

Section 7.12). The maximum duty cycle is limited to 72 % (typical).

7.7 Slope compensation (CTRL pin)

A slope compensation circuit is integrated in the IC for CCM. Slope compensation

guarantees stable operation for duty cycles greater than 50 %.

7.8 Overpower timer (OPTIMER pin)

If the OPTIMER pin is connected to capacitor C4 (see Figure 3), a temporary overload

OverPower Protection (OPP) is triggered (see Figure 5).

Fig 5.

Overpower delay

014aaa930

400 mV

protection

high load

high load

normal

load