SSL3401HN Datasheet, PDF (13/29 Pages) NXP Semiconductors – Low voltage dimmable controller for LED lighting

NXP Semiconductors
SSL3401HN
Low voltage dimmable controller for LED lighting
Table 5.
Symbol
V_set(otp)
OTP threshold setting
Parameter
overtemperature protection setting
voltage
Conditions
OTP = 120.0 °C; V_DD = 3.3 V
OTP = 107.5 °C; V_DD = 3.3 V
OTP = 110.0 °C; V_DD = 3.3 V
OTP = 112.5 °C; V_DD = 3.3 V
OTP = 115.0 °C; V_DD = 3.3 V
OTP = 117.5 °C; V_DD = 3.3 V
OTP = 122.5 °C; V_DD = 3.3 V
OTP = 125.0 °C; V_DD = 3.3 V
OTP = 127.5 °C; V_DD = 3.3 V
OTP = 130.0 °C; V_DD = 3.3 V
OTP = 120.0 C; V_DD = 3.3 V
Min
Typ Max Unit
0
-
0.20 V
0.20 -
0.41 V
0.41 -
0.61 V
0.61 -
0.82 V
0.82 -
1.03 V
1.03 -
1.23 V
1.23 -
1.54 V
1.54 -
1.85 V
1.85 -
2.16 V
2.16 -
2.47 V
2.47 -
V_DD
V
8.8.4 Open LED protection
Open LED protection works in combination with the OVP protection. If the LED string is
open, the boost output voltage increases until OVP is triggered (see Section 8.8.1).
8.8.5 Shorted LED protection
The protection is triggered if the voltage on pin FB continuously exceeds 2.1 V for a time
period > 500 ms. This voltage is measured every 10 ms for 50 Hz (AC or DC supply) and
every 8.3 ms for 60 Hz (AC). The boost converter is disabled and the LED PWM signal is
set HIGH to switch off the LED current source. Normal operation is only resumed after a
POR or a chip reset by setting the RESET pin to LOW.
8.8.6 Power-on reset
A voltage supervisor constantly monitors the supply to pin V_DD. If the voltage on pin V_DD
drops below the falling POR threshold level, the chip enters the Reset state and cannot
operate.
The chip enters Active mode when the voltage on pin V_DD exceeds the POR rising
threshold value.
SSL3401HN
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 28 January 2014
© NXP B.V. 2014. All rights reserved.
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