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TEA1738LT データシート(PDF) 7 Page - NXP Semiconductors |
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TEA1738LT データシート(HTML) 7 Page - NXP Semiconductors |
7 / 21 page TEA1738T_TEA1738LT All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Preliminary data sheet Rev. 1 — 31 December 2010 7 of 21 NXP Semiconductors TEA1738T; TEA1738LT GreenChip SMPS control IC 7.6 Protection input (PROTECT PIN) Pin PROTECT is a general purpose input pin, which can be used to switch off the converter (latched protection). The converter is stopped when the voltage on this pin is pulled above Vdet(H)(PROTECT) (0.8 V typical) or below Vdet(L)(PROTECT) (0.5 V typical). A current of 32 A (typical) flows out of the chip when the pin voltage is at the Vdet(L)(PROTECT) level. A current of 107 A (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. 7.7 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 k resistor. The CTRL pin voltage sets the peak current which is measured via pin ISENSE (see Section 7.11). At low and medium output power the switching frequency is reduced (see Section 7.13). The maximum duty cycle is limited to 80 % (typical). After 8 consecutive converter strokes at maximum duty cycle the restart protection is activated. Typically this occurs when the mains input voltage is removed. 7.8 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 %. 7.9 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 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). |
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