TEA1753T 데이터 시트보기 (PDF) - NXP Semiconductors.
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TEA1753T
NXP Semiconductors.
TEA1753T Datasheet PDF : 32 Pages
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NXP Semiconductors
TEA1753T
HV start-up flyback controller with integrated PFC controller
If the soft-start capacitor on the FBSENSE pin is charged, the flyback converter is also
activated. The flyback converter output voltage is then regulated to its nominal output
voltage. The auxiliary winding of the flyback converter takes over the IC supply. See
Figure 4.
If during start-up the LATCH pin does not reach the Ven(LATCH) level before VCC reaches
Vth(UVLO), it is deactivated. The charge current is then switched on again.
When the flyback converter starts, VFBCTRL is monitored. If this output voltage does not
reach its intended regulation level within a specified time, the voltage on the FBCTRL pin
reaches the Vto(FBCTRL) level. An error is then assumed and a safe restart is initiated.
When one of the protection functions is activated, both converters stop switching and the
VCC voltage drops to Vth(UVLO). A latched protection recharges capacitor CVCC using the
HV pin, but does not restart the converters. To provide safe restart protection, the
capacitor is recharged using the HV pin and the device restarts (see block diagram,
Figure 1).
If OVP of the PFC circuit (VVOSENSE > VOVP(VOSENSE)) occurs, the PFC controller stops
switching until the VOSENSE pin voltage drops to less than VOVP(VOSENSE). If a mains
undervoltage is detected, VVINSENSE < Vstop(VINSENSE), the PFC controller stops switching
until VVINSENSE > Vstart(VINSENSE) again.
When the voltage on the VCC pin drops below the undervoltage lockout level, both
controllers stop switching and re-enter the safe restart mode. In the safe restart mode, the
driver outputs are disabled and the VCC pin voltage is recharged using the HV pin.
TEA1753T
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3. — 24 August 2012
© NXP B.V. 2012. All rights reserved.
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