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SSL2109T Datasheet(PDF) 8 Page - NXP Semiconductors

Part No. SSL2109T
Description  GreenChip controller for LED lighting
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo NXP - NXP Semiconductors

SSL2109T Datasheet(HTML) 8 Page - NXP Semiconductors

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SSL2109T
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 2 — 26 April 2012
8 of 19
NXP Semiconductors
SSL2109T
GreenChip controller for LED lighting
rise in the coil during the on-phase is proportional to the difference between input voltage
and output voltage. Therefore, the peak current cannot be reached before ton(high) and as
a result the average output current to the LEDs is reduced.
8.6.6 Short-Winding Protection (SWP)
SWP activates if there is a steep rising current through the MOSFET and thus the external
resistor connected to the SOURCE pin. This current can occur when there is a short from
the freewheel diode. Additionally, it occurs due to a small/shorted inductor between the
input voltage and the DRAIN pin. If the voltage on the SOURCE pin is greater than 1.5 V,
latched protection is triggered following LEB time tleb. In addition, if VCC drops lower than
VCC(rst) the IC resets the latched protection mode.
8.6.7 Output Short Protection (OSP)
During the second stroke (switch-off time), if a valley is not detected within the off-time
limit (toff(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 toff(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 tdet(sc), it is concluded that a real
short-circuit exists and not start-up. The IC enters latched protection. If VCC drops lower
than VCC(rst), the IC resets the latched protection mode. During PWM dimming, the OSP
timer is paused during the off-cycle.
8.7 VCC supply
The SSL2109T 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 VCC(startup). The IC locks
out (stops switching) when the voltage at the VCC pin is lower than VCC(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 SSL2109T has an internal VCC 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 VCC. 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 IDD no external Zener diode is needed in
the dV/dt supply circuit.
8.8 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.


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