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TEA1738LT データシート(PDF) 7 Page - NXP Semiconductors

部品番号 TEA1738LT
部品情報  GreenChip SMPS control IC Adjustable overpower time-out
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メーカー  NXP [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo NXP - NXP Semiconductors

TEA1738LT データシート(HTML) 7 Page - NXP Semiconductors

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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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