TEA1751(L)T 데이터 시트보기 (PDF) - NXP Semiconductors.

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TEA1751(L)T

HV start-up DCM/QR flyback controller with integrated DCM/QR PFC controller

NXP Semiconductors. 

NXP Semiconductors

TEA1751T; TEA1751LT

GreenChip III SMPS control IC

As soon as the flyback converter is started, the voltage on the FBCTRL pin is monitored. If

the output voltage of the flyback converter does not reach its intended regulation level in a

predefined time, the voltage on the FBCTRL pin reaches the Vto(FBCTRL) level and an error

is assumed. The TEA1751 then initiates a safe restart, while in the TEA1751L the

protection is latched.

When one of the protection functions is activated, both converters stop switching and the

VCC voltage drops to Vth(UVLO). A latched protection recharges the capacitor CVCC via the

HV pin, but does not restart the converters. For a safe restart protection, the capacitor is

recharged via the HV pin and the device restarts (see block diagram, Figure 1).

In the event of an overvoltage protection of the PFC circuit, VVOSENSE > Vovp(VOSENSE),

only the PFC controller stops switching until the VOSENSE pin voltage drops below

VOVP(VOSENSE) again. Also, if a mains undervoltage is detected

VVINSENSE < Vstop(VINSENSE), only the PFC controller stops switching until

VVINSENSE > Vstart(VINSENSE) again.

When the voltage on pin VCC drops below the undervoltage lockout level, both controllers

stop switching and reenter the safe restart mode. In the safe restart mode the driver

outputs are disabled and the VCC pin voltage is recharged via the HV pin.

TEA1751T_LT_2

Product data sheet

Rev. 02 — 23 December 2009

© NXP B.V. 2009. All rights reserved.

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