SSL4101T Datasheet, PDF (7/29 Pages) NXP Semiconductors – GreenChip III+ SMPS control IC Frequency limitation to reduce switching losses.

NXP Semiconductors
SSL4101T
GreenChip III+ SMPS control IC
I_HV
V_CC
VINSENSE
LATCH
PROTECTION
PFCSENSE
PFCDRIVER
FBSENSE
soft start
soft start
V_startup
V_th(UVLO)
V_trip
V_{start(VINSENSE)}
V_EN(LATCH)
FBDRIVER
FBCTRL
V_to(FBCTRL)
VOSENSE
V_O
V_start(fb)
charging VCC
capacitor
starting
normal
converters operation
protection
restart
Fig 4. Start-up sequence, normal operation and restart sequence
014aaa156
7.1.2 Supply management
All internal reference 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.
7.1.3 Latch input
Pin LATCH is a general purpose input pin, which can be used to switch off both
converters. The pin sources a current I_O(LATCH) (80 μA typical). Switching off both
converters is stopped as soon as the voltage on this pin drops below 1.25 V.
At initial start-up the switching is inhibited until the capacitor on the LATCH pin is charged
above 1.35 V (typical). No internal filtering is done on this pin. An internal Zener clamp of
2.9 V (typical) protects this pin from excessive voltages.
SSL4101T
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 21 April 2011
© NXP B.V. 2011. All rights reserved.
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