SSL3401HN

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© NXP B.V. 2014. All rights reserved.

Product data sheet

Rev. 2 — 28 January 2014

13 of 29

NXP Semiconductors

SSL3401HN

Low voltage dimmable controller for LED lighting

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

drops below the falling POR threshold level, the chip enters the Reset state and cannot

operate.

threshold value.

Table 5.

OTP threshold setting

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

overtemperature protection setting

voltage

OTP = 120.0

0

-

0.20

V

OTP = 107.5

0.20

-

0.41

V

OTP = 110.0

0.41

-

0.61

V

OTP = 112.5

0.61

-

0.82

V

OTP = 115.0

0.82

-

1.03

V

OTP = 117.5

1.03

-

1.23

V

OTP = 122.5

1.23

-

1.54

V

OTP = 125.0

1.54

-

1.85

V

OTP = 127.5

1.85

-

2.16

V

OTP = 130.0

2.16

-

2.47

V

OTP = 120.0

C; V

2.47

-

V