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NXP Semiconductors
SSL1750
SMPS control IC for LED drivers
7.2.11 Driver (pin PFCDRIVER)
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 ef?cient operation.
7.3 Flyback controller
The SSL1750 includes a controller for a ?yback converter. The ?yback converter operates
in quasi-resonant or discontinuous conduction mode with valley switching. The auxiliary
winding of the ?yback transformer provides demagnetization detection and powers the IC
after start-up.
7.3.1 Multimode operation
The SSL1750 ?yback controller can operate in various modes, see Figure 8 .
f sw(fb)max
switching frequency
PFC burst mode
frequency
reduction
PFC on
discontinuous
with valley
switching
quasi resonant
output power
014aaa025
Fig 8.
Multimode operation ?yback
At high output power the converter switches to quasi-resonant mode. The next converter
stroke is started after demagnetization of the transformer current. In quasi-resonant mode
switching losses are minimized as the converter only switches on when the voltage across
the external MOSFET is at its minimum (valley switching, see also Section 7.3.2 ).
To prevent high frequency operation at lower loads, the quasi-resonant operation changes
to discontinuous mode operation with valley skipping in which the switching frequency is
limited for EMI to f sw(fb)(max) (125 kHz typ). Again, the external MOSFET is only switched
on when the voltage across the MOSFET is at its minimum.
At very low power and standby levels the frequency is controlled down by a Voltage
Controlled Oscillator (VCO). The minimum frequency can be reduced to zero. During
frequency reduction mode, the primary peak current is kept at a minimal level of Ipkmax/4
to maintain a high ef?ciency. (Ipkmax is the maximum primary peak current set by the
sense resistor and the maximum sense voltage.) As the primary peak current is low in
frequency reduction mode operation (Ipk = Ipkmax/4), no audible noise is noticeable at
switching frequencies in the audible range. Valley switching is also active in this mode.
SSL1750_1
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 September 2008
13 of 29
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