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SSL2129AT/1J

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
SSL2129AT All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 4 — 3 October 2013 10 of 19
NXP Semiconductors
SSL2129AT
Dimmable LED driver IC
When the voltage on the NTC pin exceeds V
th(high)NTC
(see Figure 6 (4)), the converter
delivers nominal output current. When the voltage is lower than this level,
the peak current
is gradually reduced until V
th(low)NTC
is reached (see Figure 6 (3)). The peak current is
now half the peak current of nominal operation. When V
act(tmr)NTC
is passed (see Figure 6
(2)) a timer starts to run to distinguish between the following situations:
• If the low-level V
deact(tmr)NTC
is not reached within time t
to(deact)NTC
(see Figure 6 (1))
LED overtemperature is detected. The IC stops switching and attempts to restart from
the HV p
in voltage. The converter restarts from an NTC protection shutdown when the
voltage on the NTC pin exceeds V
th(high)NTC
(see Figure 6 (4)). It is assumed that the
reduction in peak current does not result in a lower NTC temperature and LED OTP is
activated.
• If the low-level V
deact(tmr)NTC
is reached within the time t
to(deact)NTC
(see Figure 6 (1)) it
is assumed that the pin is pulled down externally. T
he restart function is not triggered.
Instead, the output current is reduced to zero. PWM dimming can be implemented this
way. The output current rises again when the voltage is higher than V
th(low)NTC
.
8.9.1 Soft-start function
The NTC pin can be used to make a soft start function. During switch-on, the level on the
NTC pin is low. By connecting a capacitor (in parallel with the NTC resistor), a time
constant can be defined. The time constant causes the level on the NTC pin to increase
slowly. When passing level V
th(low)NTC
(see Figure 6 (3)), the convertor starts with half of
the maximum current. The output current slowly increases to maximum when V
th(high)NTC
(see Figure
6 (4)) is reached.
Fig 6. NTC control curve
SSL2129AT All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 4 — 3 October 2013 11 of 19
NXP Semiconductors
SSL2129AT
Dimmable LED driver IC
9. Limiting values
[1] The current into the VCC pin must not exceed the maximum I
DD
value.
[2] An internal clamp sets the supply voltage
[3] Human body model: equivalent to discharging a 100 pF capacitor through a 1.5 k series resistor.
[4]
Charged device model: equivalent to charging the IC up to 1 kV and the subsequent discharging of each
pin down to 0 V over a 1 resistor.
10. Thermal characteristics
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter Conditions Min Max Unit
General
SR slew rate on pin DRAIN 5 +5 V/ns
P
tot
total power dissipation SO8 package - 0.6 W
T
amb
ambient temperature 40 +125 C
T
j
junction temperature 40 +150 C
T
stg
storage temperature 55 +150 C
Voltages
V
CC
supply voltage continuous
[1]
0.4 +20 V
V
DRAIN
voltage on pin DRAIN 0.4 +600 V
V
HV
voltage on pin HV current limited 0.4 +600 V
V
SOURCE
voltage on pin SOURCE current limited 0.4 +5.2 V
V
NTC
voltage on pin NTC current limited 0.4 +5.2 V
Currents
I
DD
supply current on pin VCC
[2]
- 20 mA
V
ESD
electrostatic discharge
voltage
human body
model: pins
DRAIN and HV
1 +1 kV
human body
mode
l; all other
pins
[3]
2 +2 kV
charged device
[4]
500 +500 V
Table 5. Thermal characteristics
Symbol Parameter Conditions Typ Unit
R
th(j-a)
thermal resistance from junction to
ambient
in free air; PCB: 2 cm 3 cm; 2-layer; 35 m
Cu per layer
159 K/W
in free air; PCB: JEDEC 2s2p 89 K/W
j-top
thermal characterization parameter
from junction to top of package
top package temperature measured at the
warmest point on top of the case
0.49 K/W
SSL2129AT All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 4 — 3 October 2013 12 of 19
NXP Semiconductors
SSL2129AT
Dimmable LED driver IC
11. Characteristics
Table 6. Characteristics
Values specified at T
amb
= 25
C unless otherwise stated; all voltages are measured with respect to ground; currents are
positive when flowing into the IC.
Symbol Parameter Conditions Min Typ Max Unit
f
conv
conversion frequency - 100 - kHz
High-voltage
I
leak(DRAIN)
leakage current on pin DRAIN V
DRAIN
= 600 V - - 10 A
I
leak(HV)
leakage current on pin HV V
HV
= 600 V - - 30 A
Supply
V
CC
supply voltage operating range
[1]
8 - 16 V
V
CC(startup)
start-up supply voltage 11 12 13 V
V
CC(stop)
stop supply voltage 8 9 10 V
V
CC(hys)
hysteresis of supply voltage between V
CC(startup)
and V
CC(stop)
2 - 4.5 V
V
CC(rst)
reset supply voltage 4.5 5 5.5 V
V
CC(swon)reg
regulator switch-on supply voltage 8.75 9.25 9.75 V
V
CC(swoff)reg
regulator switch-off supply voltage 9.5 10 10.5 V
V
CC(reg)hys
regulator supply voltage hysteresis V
CC(swoff)reg
V
CC(swon)reg
0.3 - - V
V
CC(regswon-stop)
supply voltage difference between
regulator switch-on and stop
V
CC(swon)reg
V
CC(stop)
0.3 - - V
Consumption
I
stb(HV)
standby current on pin HV during start-up or in protection;
V
HV
= 100 V
300 350 400 A
I
CC(INT)
internal supply current normal operation - 1.3 - mA
Capability
I
sup(high)HV
high supply current on pin HV standby: V
HV
= 40 V;
V
CC
< V
CC(stop)
1 1.3 1.6 mA
regulator on: V
HV
= 40 V;
V
CC
< V
CC(swon)reg
after start-up
2 2.3 2.6 mA
Current
V
th(ocp)SOURCE
overcurrent protection threshold
voltage on pin SOURCE
V/t = 0.1 V/s 480 500 520 mV
V/t = 0.1 V/s; V
NTC
= 0.325 V 230 250 270 mV
t
d(ocp-swoff)
delay time from overcurrent
protection to switch-off
V/t = 0.1 V/s - 75 100 ns
t
leb
leading edge blanking time overcurrent protection 260 300 340 ns
Valley detection
(V/t)
vrec
valley recognition voltage change
with time
on pin DRAIN 30 20 10 V/s
f
ring
ringing frequency
[2]
200 550 1000 kHz
V
vrec(min)
minimum valley recognition
voltage difference
voltage drop on pin DRAIN 15 20 25 V
t
d(vrec-swon)
valley recognition to switch-on
delay time
- 100 - ns
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

SSL2129AT/1J

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Buy SSL2129AT/1J
Manufacturer:
NXP Semiconductors
Description:
IC LED DRIVER OFFLINE DIM 8SO
Lifecycle:
New from this manufacturer.
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