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NXP Semiconductors
S2
Istart(soft)fb ≤ 60 μ A
SSL1750
SMPS control IC for LED drivers
SOFT START
CONTROL
RSS2
CSS2
10
FBSENSE
+
0.5 V
OCP
RSENSE2
014aaa020
Fig 13. Soft start-up of ?yback
7.3.7 Maximum on-time
The ?yback controller limits the ‘on-time’ of the external MOSFET to 25 μ s (typ). When the
‘on-time’ is longer than 25 μ s, the IC stops switching and enters the safe restart mode.
7.3.8 Overvoltage protection (pin FBAUX)
An output overvoltage protection is implemented in this IC. This works for the SSL1750 by
sensing the auxiliary voltage via the current ?owing into pin FBAUX during the secondary
stroke. The auxiliary winding voltage is a well-de?ned replica of the output voltage.
Voltage spikes are averaged by an internal ?lter.
If the output voltage exceeds the OVP trip level, an internal counter starts counting
subsequent OVP events. The counter has been added to prevent incorrect OVP detection
which might occur during ElectroStatic Discharge (ESD) or lightning events. If the output
voltage exceeds the OVP trip level a few times and not again in a subsequent cycle, the
internal counter counts down at twice the speed it uses when counting up. However, when
typically 8 cycles of subsequent OVP events are detected, the IC assumes a true OVP
and the OVP circuit switches the power MOSFET off. As the protection is latched, the
converter only restarts after the internal latch is reset. In a typical application the mains
should be interrupted to reset the internal latch.
The output voltage V ovp(FBAUX) at which the OVP function trips, can be set by the
demagnetization resistor, R FBAUX . See Equation 5 .
V o ( ovp ) = ----------- ( I ovp ( FBAUX ) × R FBAUX + V clamp ( FBAUX ) )
N s
N aux
(5)
where N s is the number of secondary turns and N aux is the number of auxiliary turns of the
transformer. Current I ovp(FBAUX) is internally trimmed.
The value of R FBAUX can be adjusted to the turns ratio of the transformer, thus making an
accurate OVP detection possible.
SSL1750_1
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 September 2008
18 of 29
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