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TEA1733CT датащи(PDF) 7 Page - NXP Semiconductors |
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TEA1733CT датащи(HTML) 7 Page - NXP Semiconductors |
7 / 20 page TEA1733CT All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. 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 situation is allowed. Pin CTRL sets Vctrl(Ipeak) (see Figure 1). When Vctrl(Ipeak) is above 400 mV, the IIO(OPTIMER) current (11 A 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). When the Vprot(OPTIMER) voltage is reached the device restarts. If the overload is removed before the Vprot(OPTIMER) voltage is reached, the converter continues switching. Fig 5. Overpower delay 014aaa930 VOPTIMER VISENSE VO 400 mV protection high load high load normal load Vprot(OPTIMER) IO |
Аналогичный номер детали - TEA1733CT |
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Аналогичное описание - TEA1733CT |
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