tea1752t NXP Semiconductors, tea1752t Datasheet - Page 7

• Manufacturer Part Number: tea1752t
• Description: Greenchip Iii Smps Control Ic
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TEA1752T_LT
Product data sheet
converter is also activated (providing the soft start capacitor on the FBSENSE pin is
charged). The flyback converter output voltage is then regulated to its nominal value. The
IC supply is taken over by the auxiliary winding of the flyback converter. See
If during start-up the LATCH pin does not reach the V
V
again.
When the flyback converter is started, the voltage on pin FBCTRL is monitored. If the
flyback converter output voltage does not reach its intended regulation level in a
predefined time, the voltage on pin FBCTRL reaches the V
assumed. The TEA1752T then initiates a safe restart, while in the TEA1752LT the
protection is latched.
When one of the protection functions is activated, both converters stop switching and the
V
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
In the event of an overvoltage protection of the PFC circuit where
V
voltage drops back below V
V
V
When the voltage on pin V
stop switching and reenter the safe restart mode. In this mode the driver outputs are
disabled and the V
th(UVLO)
CC
VOSENSE
VINSENSE
VINSENSE
voltage drops to V
, the LATCH pin output is deactivated and the charge current is switched on
> V
< V
> V
ovp(VOSENSE)
stop(VINSENSE)
start(VINSENSE)
All information provided in this document is subject to legal disclaimers.
CC
pin voltage is recharged via the HV pin.
th(UVLO)
Rev. 02 — 24 June 2010
, the PFC controller stops switching until the VOSENSE pin
CC
, the PFC controller stops switching until
.
ovp(VOSENSE)
drops below the undervoltage lockout level, both controllers
. A latched protection recharges the capacitor C
. If a mains undervoltage is detected where
TEA1752T; TEA1752LT
en(LATCH)
Figure
GreenChip III SMPS control IC
to(FBCTRL)
1.
level before V
level and an error is
© NXP B.V. 2010. All rights reserved.
CC
Figure
VCC
reaches
via the
4.
7 of 34