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NXP Semiconductors
V VOSENSE
envelop of
peak current
SSL1750
SMPS control IC for LED drivers
V burst(H)
V burst(L)
Fig 7.
Burst mode control
soft-start
ton control
soft-stop
014aaa019
7.2.7 Overcurrent protection (pin PFCSENSE)
The maximum peak current is limited cycle-by-cycle by sensing the voltage across an
external sense resistor (R SENSE1 ) on the source of the external MOSFET. The voltage is
measured via the pin PFCSENSE.
7.2.8 Mains undervoltage lockout / brownout protection (pin VINSENSE)
To prevent the PFC from operating at very low mains input voltages, the voltage on pin
VINSENSE is sensed continuously. As soon as the voltage on this pin drops below the
V stop(VINSENSE) level, switching of the PFC is stopped. If the low mains situation continues,
the PFC bus voltage eventually drops. The voltage on pin VOSENSE then drops below the
V start(fb) level and the ?yback converter is also disabled.
The voltage on pin VINSENSE is clamped to a minimum value,
(V start(VINSENSE) ? ? V pu(VINSENSE) , for a fast restart as soon as the mains input voltage is
restored after a mains dropout.
7.2.9 Overvoltage protection (pin VOSENSE)
An overvoltage protection circuit has been built in to prevent output overvoltage during
load steps and mains transients.
As soon as the voltage on pin VOSENSE exceeds the V ovp(VOSENSE) level, switching of the
power factor correction circuit is inhibited. Switching of the PFC recommences as soon as
the voltage on VOSENSE voltage drops below the V ovp(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 (pin VOSENSE)
The power factor correction circuit does not start switching until the voltage on pin
VOSENSE is above the V th(ol)(VOSENSE) level. This protects the circuit from open loop and
VOSENSE short situations. As pin VOSENSE draws a small input current, switching is
also inhibited when the pin is left open.
SSL1750_1
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 September 2008
12 of 29
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