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TEA1733AT

GreenChip SMPS control IC

NXP Semiconductors. 

NXP Semiconductors

TEA1733AT

GreenChip SMPS control IC

current of 32 μA (typical) flows out of the chip when the pin voltage is at the

Vdet(L)(PROTECT) level. A current of 107 μA (typical) flows into the chip when the pin voltage

is at the Vdet(H)(PROTECT) level.

The PROTECT input can be used to create an 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 excessive voltages.

7.6 Duty cycle control (CTRL pin)

The output power of the converter is regulated by the CTRL pin. This pin is connected to

an internal 5.4 V supply using an internal 7 kΩ resistor.

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

(see Section 7.9). At 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

situation is allowed. Vctrl(Ipeak) (see Figure 1) is set by pin CTRL. When Vctrl(Ipeak) is above

400 mV, the IIO(OPTIMER) current (11 μA typical) is sourced from the OPTIMER pin. If the

voltage on the OPTIMER pin reaches the Vprot(OPTIMER) voltage (2.5 V typical) the

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

IO

VO

VISENSE

400 mV

VOPTIMER

high load

normal

load

high load

Vprot(OPTIMER)

protection

Fig 5. Overpower delay

014aaa930

When the Vprot(OPTIMER) voltage is reached the device restarts.

If the overload is removed before the Vprot(OPTIMER) voltage is reached, the converter will

continue switching.

TEA1733AT

Preliminary data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 2 — 19 November 2010

© NXP B.V. 2010. All rights reserved.

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