tea1752t NXP Semiconductors, tea1752t Datasheet - Page 8

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

NXP Semiconductors
TEA1752T_LT
Product data sheet
7.1.2 Supply management
7.1.3 Latch input
All internal control voltages are derived from a temperature compensated and trimmed
on-chip band gap circuit. Internal reference currents are derived from a temperature
compensated and trimmed on-chip current reference circuit.
Pin LATCH is a general purpose input pin, which can be used to switch off both
converters. The pin sources a current I
converters is stopped as soon as the voltage on this pin drops below 1.25 V.
Fig 4.
PROTECTION
PFCDRIVER
PFCSENSE
VINSENSE
PFCCOMP
FBDRIVER
VOSENSE
FBSENSE
FBCTRL
LATCH
Start-up sequence, normal operation and restart sequence
V
I
V
HV
CC
O
charging VCC
All information provided in this document is subject to legal disclaimers.
capacitor
Rev. 02 — 24 June 2010
converters
starting
soft start
operation
normal
soft start
O(LATCH)
TEA1752T; TEA1752LT
(80 μA typical). Switching off both
protection
GreenChip III SMPS control IC
restart
© NXP B.V. 2010. All rights reserved.
V
V
V
V
V
V
V
V
en(PFCCOMP)
startup
th(UVLO)
trip
start(VINSENSE)
en(LA TCH)
to(FBCTRL)
start(fb)
014aaa744
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