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SSL4101T Datasheet PDF : 29 Pages
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NXP Semiconductors
SSL4101T
GreenChip III+ SMPS control IC
7.2.9 Overvoltage protection (VOSENSE pin)
To prevent output overvoltage during load steps and mains transients, an overvoltage
protection circuit is built in.
As soon as the voltage on the VOSENSE pin exceeds the Vovp(VOSENSE) level, switching
of the power factor correction circuit is inhibited. Switching of the PFC recommences as
soon as the VOSENSE pin voltage drops below the Vovp(VOSENSE) level again.
When the resistor between pin VOSENSE and ground is open, the overvoltage protection
is also triggered.
7.2.10 PFC open loop protection (VOSENSE pin)
The power factor correction circuit does not start switching until the voltage on the
VOSENSE pin is above the Vth(ol)(VOSENSE) level. This protects the circuit from open loop
and VOSENSE short situations.
7.2.11 Driver (PFCDRIVER pin)
The driver circuit to the gate of the power MOSFET has a current sourcing capability of
typically −500 mA and a current sink capability of typically 1.2 A. This permits fast turn-on
and turn-off of the power MOSFET for efficient operation.
7.3 Flyback controller
The SSL4101T includes a controller for a flyback converter. The flyback converter
operates in quasi-resonant or discontinuous conduction mode with valley switching. The
auxiliary winding of the flyback transformer provides demagnetization detection and
powers the IC after start-up.
7.3.1 Multimode operation
The SSL4101T flyback controller can operate in several modes; see Figure 6.
fsw(fb)max
PFC off
switching frequency
frequency
reduction
PFC on
discontinuous
with valley
switching
quasi resonant
Fig 6. Multimode operation flyback
output power
014aaa158
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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