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NXP Semiconductors
SSL21081T/2T/3T/4T
GreenChip drivers for LED lighting
A valley is detected and accepted if both the frequency of the oscillations and the voltage
swing are within the range specified (f ring and ? V vrec(min) ) for detection. If a valid valley is
not detected, the secondary stroke is continued until the maximum off-time (t off(high) ) is
reached, then the next cycle is started.
V GATE
internal MOSFET switch
V OUT
V D
V IN
valley
0
I L
0
magnetization
demagnetization
1
2
3
4
t 0
t 1
t 2
t 3
t 00
T
001aan699
Fig 5.
Buck waveforms and valley detection
8.4 Protective features
The IC has the following protective features:
?
?
?
?
?
?
?
?
UnderVoltage LockOut (UVLO)
Leading-Edge Blanking (LEB)
OverCurrent Protection (OCP)
Internal OverTemperature Protection (OTP)
Brownout protection
Short-Winding Protection (SWP)
Output Short Protection (OSP)
LED overtemperature control and protection
The SWP and the OSP are latched protections. These protections cause the IC to halt
until a reset (a result of power cycling) is executed. When V CC drops lower than V CC(rst) ,
the IC resets the latch protection mode. The internal OTP and LED over temperature
protections are safe-restart protections. The IC halts, causing V CC to fall lower than
V CC(stop) , and instigates start-up. Switching starts only when no fault condition exists.
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.
7 of 23
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