TEA1733LT 데이터 시트보기 (PDF) - NXP Semiconductors.

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TEA1733LT

GreenChip III SMPS control IC

NXP Semiconductors. 

NXP Semiconductors

TEA1733T; TEA1733LT

GreenChip III SMPS control IC

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

A small 10 nF 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 7.10). At a low output power, the switching frequency is also reduced (see

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

7.7 Slope compensation (CTRL pin)

A slope compensation circuit is integrated in the IC or 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 the 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

014aaa930

Fig 5. Overpower delay (TEA1733T)

• TEA1733T: when the Vprot(OPTIMER) voltage is reached the device restarted

• TEA1733LT: when the Vprot(OPTIMER) voltage is reached, it is latched in the off state

TEA1733T_TEA1733LT_2

Product data sheet

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

Rev. 02 — 26 March 2010

© NXP B.V. 2010. All rights reserved.

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