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PDF SSL21081AT Data sheet ( Hoja de datos )
| Número de pieza | SSL21081AT | |
| Descripción | Compact non-dimmable LED driver IC | |
| Fabricantes | NXP Semiconductors | |
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SSL21081AT
Compact non-dimmable LED driver IC
Rev. 6 — 3 October 2013
Product data sheet
1. General description
The SSL21081AT is a high-voltage Integrated Circuit (IC) for driving LED lamps in general
mains non-dimmable lighting applications.
The main benefits are:
• Small Printed-Circuit Board (PCB) footprint; compact solution
• High efficiency (up to 95 %)
• Ease of integration
• Low electronic Bill Of Material (BOM)
The IC incorporates a 300 V MOSFET.
The IC works as boundary conduction mode converters, typically in buck configuration. It
has been designed to start up directly from the HV supply by an internal high-voltage
current source. Thereafter, the dV/dt supply is used with capacitive coupling from the drain
or any other auxiliary supply. This function provides full flexibility in the application design.
The IC consumes 1.3 mA of supply current with an internal clamp limiting the supply
voltage.
The IC provides accurate output current control with LED current accuracy within 5 %. It
can be operated using Pulse-Width Modulation (PWM) current regulation. It includes
many protection features including easy LED temperature feedback.
2. Features and benefits
LED driver ICs for driving LED strings from a rectified mains supply
High-efficiency switch mode buck driver product family:
drivers with integrated 300 V (DC) power switches
Controller with power-efficient boundary conduction mode of operation with:
No reverse recovery losses in freewheel diode
Zero Current Switching (ZCS) for turn-on of switch
Zero voltage or valley switching for turn-on of switch
Minimal required inductance value and size
Direct PWM current regulation possible
Fast transient response through cycle-by-cycle current control:
Negligible AC mains ripple at LED current and minimal total capacitor value
No over or undershoots in the LED current
1 page  
NXP Semiconductors
7. Pinning information
7.1 Pinning
SSL21081AT
Compact non-dimmable LED driver IC
+9
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9&&
17&
'5$,1
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*1'
'9'7
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Fig 2. SSL21081AT pin configuration (SO8)
7.2 Pin description
Table 4. Pin description
Symbol
Pin (SO8)
HV 1
SOURCE
2
VCC
3
NTC
4
DVDT
5
GND
6; 7
DRAIN
8
Description
high-voltage supply pin
low-side internal switch
supply voltage
LED temperature protection input
AC supply pin
ground
high-side internal switch
SSL21081AT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 3 October 2013
© NXP B.V. 2013. All rights reserved.
5 of 21
5 Page 
NXP Semiconductors
SSL21081AT
Compact non-dimmable LED driver IC
When the voltage on the NTC pin exceeds Vth(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 Vth(low)NTC is reached (see Figure 6 (3)). The peak current is
now half the peak current of nominal operation. When Vact(tmr)NTC is passed
(see Figure 6 (2)), a timer starts to run to distinguish between the following situations:
• If the low-level Vdeact(tmr)NTC is not reached within time tto(deact)NTC (see Figure 6 (1)),
LED overtemperature is detected. The IC stops switching and attempts to restart from
the HV pin voltage. The converter restarts from an NTC protection shutdown when the
voltage on the NTC pin exceeds Vth(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 Vdeact(tmr)NTC is reached within the time tto(deact)NTC (see Figure 6 (1)) it
is assumed that the pin is pulled down externally. The restart function is not triggered.
Instead, the output current is reduced to zero. PWM regulation and consequently LED
output current regulation can be implemented this way. The output current rises again
when the voltage exceeds Vth(low)NTC.
8.7.1 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 Vth(low)NTC (see Figure 6 (3)), the converter starts with half of
the maximum current. The output current slowly increases to maximum when Vth(high)NTC
(see Figure 6 (4)) is reached.
8.8 Heat sink
The copper of the PCB acts as the heat sink for SSL21081AT applications.
Equation 1 shows the relation between the maximum allowable power dissipation P and
the thermal resistance from junction to ambient.
Rthj – a = Tjmax – Tamb P
(1)
Where:
Rth(j-a) = thermal resistance from junction to ambient
Tj(max) = maximum junction temperature
Tamb = ambient temperature
P = power dissipation
SSL21081AT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 3 October 2013
© NXP B.V. 2013. All rights reserved.
11 of 21
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