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PDF SSL21084AT Data sheet ( Hoja de datos )
| Número de pieza | SSL21084AT | |
| Descripción | Mains dimmable LED driver IC | |
| Fabricantes | NXP Semiconductors | |
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SSL21084AT
Mains dimmable LED driver IC
Rev. 6 — 3 October 2013
Product data sheet
1. General description
The SSL21084AT is a high-voltage Integrated Circuit (IC) for driving retrofit LED lamps in
general lighting applications. It enables the implementation of a very compact low-cost
system solution. The IC has an integrated internal HV switch and work as Boundary
Conduction Mode (BCM) buck converter.
The SSL21084AT is supplied by a start-up bleeder resistor, a dV/dt supply using
capacitive coupling from the drain or any other auxiliary supply. The IC supply current is
low. An internal clamp limits the supply voltage.
The IC has accurate output current control and can be operated using Pulse-Width
Modulation (PWM) dimming. In addition, several protection features are available such as
easy external temperature feedback.
The main benefits of this IC include:
• Small Printed-Circuit Board (PCB) footprint and compact solution
• High efficiency (up to 90 %) for non-dimmable high power factor solutions
• High power factor (>0.9)
• Ease of integration and many protection features
• Low electronic Bill Of Materials (BOM)
• Mains phase-cut dimmable using external components
• Highly flexible IC for use in buck, buck/boost mode
• Single inductor used for non-isolated configurations because of internal
demagnetization detection and dV/dt supply
The SSL21084AT is designed to start up directly from the HV supply using an internal
high-voltage current source. An internal clamp limits the supply voltage.
1 page  
NXP Semiconductors
7. Pinning information
7.1 Pinning
SSL21084AT
Mains dimmable LED driver IC
HV 1
12 DRAIN
GND 2
SOURCE 3
VCC 4
NTC 5
GND 6
Fig 2. SSL21084AT pin configuration
11 GND
IC 10 GND
9 DVDT
8 TONMOD
7 GND
001aan703
7.2 Pin description
Table 3. Pin description
Symbol
Pin
HV 1
GND
2, 6,7, 10, 11
SOURCE
3
VCC
4
NTC
5
TONMOD
8
DVDT
9
DRAIN
12
Description
high-voltage supply pin
ground
low-side external switch
supply voltage
temperature protection input
on-time modulation input
AC supply pin
high-side external switch
SSL21084AT
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
Peak current
Ipk
Ipk / 2
SSL21084AT
Mains dimmable LED driver IC
Vth(ocp)SOURCE = 500 mV
Vth(ocp)SOURCE = 250 mV
1 23
4
5 VNTC
001aan700
Fig 6. NTC control curve
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 dimming can be implemented this
way. The output current rises again when the voltage is higher than 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 convertor starts with half of
the maximum current. The output current slowly increases to maximum when Vth(high)NTC
(see Figure 6 (4)) is reached.
SSL21084AT
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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| PDF Descargar | [ Datasheet SSL21084AT.PDF ] | |
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