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NXP Semiconductors
SSL21081T/2T/3T/4T
GreenChip drivers for LED lighting
8.4.7 Output Short Protection (OSP)
During the second stroke (switch-of time), if a valley is not detected within the off-time limit
(t off(high) ), then typically the output voltage is less than the minimum limit allowed in the
application. This condition can occur either during starting up or due to a short. A timer is
started when t off(high) is detected, and is stopped only if a valid valley-detection occurs in
one of the subsequent cycles. If no valley is detected for t det(sc) , it is concluded that a real
short-circuit exists and not start-up. The IC enters latched protection. If V CC drops lower
than V CC(rst) , the IC resets the latched protection mode. During PWM dimming, the OSP
timer is paused during the off-cycle of the PWM signal.
8.5 VCC supply
The SSL2108X can be supplied using three methods:
? Under normal operation, the voltage swing on the DVDT pin is rectified within the IC
providing current towards the VCC pin
? At start-up, there is an internal current source connected to the HV pin. The current
source provides internal power until either the dV/dt supply or an external current on
the VCC pin provides the supply
? An external voltage source can be connected to the VCC pin
The IC starts up when the voltage at the VCC pin is higher than V CC(startup) . The IC locks
out (stops switching) when the voltage at the VCC pin is lower than V CC(stop) . The
hysteresis between the start and stop levels allows the IC to be supplied by a buffer
capacitor until the dV/dt supply is settled. The SSL2108X has an internal V CC clamp,
which is an internal active Zener (or shunt regulator). This internal active Zener limits the
voltage on the supply VCC pin to the maximum value of V CC . If the maximum current of
the dV/dt supply minus the current consumption of the IC (determined by the load on the
gate drivers), is lower than the maximum value of I DD no external Zener diode is needed in
the dV/dt supply circuit.
8.6 DVDT supply
The DVDT pin is connected to an internal single-sided rectification stage. When an
alternating voltage with sufficient amplitude is supplied to the pin, the IC can be powered
without any other external power connection. This solution provides an effective method
to prevent the additional high-power losses, which would result if a regulator were used for
continuously powering the IC. Unlike an auxiliary supply, additional inductor windings are
not needed.
8.7 VCC regulator
During supply dips, the input voltage can drop too low to supply the required IC current
through the DVDT pin. Under these conditions, if the VCC voltage drops lower than
V CC(swon)reg level, another regulator with a current capability of up to I sup(high)HV is started.
The job of the regulator is to fill in the required supply current, which the DVDT supply
does not deliver, thus preventing the IC going into UVLO. When the VCC voltage is higher
than V CC(swon)reg level, the regulator is turned off.
SSL21081T_2T_3T_4T
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3.1 — 22 February 2012
? NXP B.V. 2012. All rights reserved.
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