SSL21081T
Compact non-dimmable LED driver IC
Rev. 6 — 3 October 2013
Product data sheet
1. General description
The SSL21081T 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 has 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:
driver 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
SSL21081T
NXP Semiconductors
Compact non-dimmable LED driver IC
Internal protections:
UnderVoltage LockOut (UVLO)
Leading-Edge Blanking (LEB)
OverCurrent Protection (OCP)
Short-Winding Protection (SWP)
Internal OverTemperature Protection (OTP)
Brownout protection
Output Short Protection (OSP)
Low component count LED driver solution (see Figure 3):
No Schottky diode required due to ZCS
Easy external temperature protection with a single NTC resistor
Option for soft-start function
Compatible with wall switches with built-in indication light during standby1
IC lifetime easily matches or surpasses LED lamp lifetime
3. Applications
SSL21081T products are intended for compact mains non-dimmable LED lighting
applications with accurate fixed current output for single mains input voltages. Mains input
voltages include 100 V (AC), 120 V (AC). The output signal can be modulated using a
PWM signal.
1.
The Hotaru switch is a well-known wall switch with built-in light
SSL21081T
Product data sheet
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SSL21081T
NXP Semiconductors
Compact non-dimmable LED driver IC
4. Quick reference data
Table 1.
Symbol
Quick reference data
Parameter
Conditions
[1]
Min
Typ
Max
Unit
8
-
16
V
VCC
supply voltage
operating range
RDSon
drain-source on-state
resistance
Tj = 25 C
2.05
2.3
2.55
Tj = 125 C
3.05
3.45 3.85
fconv
conversion frequency
-
100
-
kHz
IDRAIN
current on pin DRAIN
2
-
+2
A
VDRAIN
voltage on pin DRAIN
0.4
-
+300
V
[1]
An internal clamp sets the supply voltage. The current into the VCC pin must not exceed the maximum IDD
value (see Table 5).
5. Ordering information
Table 2.
Ordering information
Type number
SSL21081T
Package
Name
Description
Version
SO8
plastic small package outline body; 8 leads; body width
3.9 mm
SOT96-1
5.1 Ordering options
Remark: All voltages are in V (AC) unless otherwise specified.
Table 3.
SSL21081T
Product data sheet
Ordering options
Type
Input voltage
Internal MOSFET
characteristics
Package
SSL21081T
100 V; 120 V
300 V (DC); 2.3
SO8
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SSL21081T
NXP Semiconductors
Compact non-dimmable LED driver IC
6. Block diagram
+9
9&&
-)(7
6833/ 1.5 V, latched protection is triggered following LEB time tleb. In addition, if VCC drops to
below VCC(rst) the IC resets the latched protection mode.
8.3.7 Output Short-circuit Protection (OSP)
During the secondary stroke (switch-off time), if a valley is not detected within the off-time
limit (toff(high)), then typically the output voltage is less than the minimum limit allowed in
the application. This condition can occur either during start-up or due to a short-circuit. A
timer tdet(sc) is started when toff(high) is detected. Timer tdet(sc) is reset when a valid valley
detection occurs in one of the subsequent cycles or when VCC drops to below VCC(stop).
The timer can also be reset if the maximum limit on the on-time of the switch (ton(high)) is
reached, which is usually the case at start-up (brownout protection). If no valley is
detected and (ton(high)) is not reached before tdet(sc), then it is concluded that a real
short-circuit exists. The IC enters latched protection. If VCC drops to below VCC(rst), the IC
resets the latched protection mode (see Figure 5).
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9&& VWRS
6
4
5
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SSL21081T
Product data sheet
4
263
5
9&& UVW
9$//(<
'(7(&7,21
Fig 5.
6
DDD
OSP logic diagram
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9 of 22
SSL21081T
NXP Semiconductors
Compact non-dimmable LED driver IC
8.4 VCC supply
The SSL21081T is supplied using three methods:
• Under normal operation, the voltage swing on the DVDT pin is rectified within the IC
providing current towards the VCC pin
• At start-up, there is an internal current source connected to the HV pin. The current
source provides internal power until either the dV/dt supply or an external current on
the VCC pin provides the supply
• Using an auxiliary winding, the voltage can be rectified and connected to the VCC pin
via a series resistor.
The IC starts up when the voltage at the VCC pin exceeds VCC(startup). The IC locks out
(stops switching) when the voltage at the VCC pin is < VCC(stop). The hysteresis between
the start and stop levels allows the IC to be supplied by a buffer capacitor until the dV/dt
supply is settled. The SSL21081T has an internal VCC clamp, which is an internal active
Zener (or shunt regulator). This internal active Zener limits the voltage on the supply VCC
pin to the maximum value of VCC. If the maximum current of the dV/dt supply minus the
current consumption of the IC (determined by the load on the gate drivers), is lower than
the maximum value of IDD no external Zener diode is required in the dV/dt supply circuit.
8.5 DVDT pin supply (dV/dt)
The DVDT pin is connected to an internal single-sided rectification stage. When a different
voltage with sufficient amplitude is supplied to the pin, the IC can be powered without any
other external power connection. This provides an effective method to prevent additional
high power losses, which are the result if a regulator were used for continuously powering
the IC. Unlike an auxiliary supply, additional inductor windings are not required.
8.6 VCC regulator
During supply dips, the input voltage can drop so much that it can no longer supply the
required IC current through the DVDT pin. Under these conditions, if the VCC voltage
drops to below VCC(swon)reg level, another regulator with a current capability of up to
Isup(high)HV is started. The job of the regulator is to fill in the required supply current, which
the dV/dt supply does not deliver, thus preventing that the IC enters UVLO. When the
VCC voltage exceeds the VCC(swon)reg level, the regulator is turned off.
8.7 NTC functionality and PWM regulation
The NTC pin can be used as a control method for LED thermal protection. Alternatively,
the pin can be used as an input to disable/enable light output using a digital signal (PWM
regulation). The pin has an internal current source that generates the current of Ioffset(NTC).
An NTC resistor to monitor the LED temperature can be connected directly to the NTC
pin. Depending on the resistance value and the corresponding voltage on the NTC pin,
the converter reacts as shown in Figure 6.
During start-up, before VCC reaches VCC(startup) the voltage on the NTC pin must be less
than the minimum value of Vact(tmr)NTC. This is valid when the voltage on the NTC pin is
derived from the VCC using a resistive divider and a PTC in series with the resistor
between pins VCC and NTC.
SSL21081T
Product data sheet
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SSL21081T
NXP Semiconductors
Compact non-dimmable LED driver IC
If an NTC resistor is connected between the NTC pin and ground, the voltage on the NTC
pin is 0 V when VCC reaches VCC(startup).
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Fig 6.
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9WK ORZ 17&
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9WK RFS 6285&( P9
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,SN
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DDQ
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 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.
SSL21081T
Product data sheet
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SSL21081T
NXP Semiconductors
Compact non-dimmable LED driver IC
8.8 Heat sink
The copper of the PCB acts as the heat sink for SSL21081T applications.
Equation 1 shows the relation between the maximum allowable power dissipation P and
the thermal resistance from junction to ambient.
R th j – a = T j max – T amb P
(1)
Where:
Rth(j-a) = thermal resistance from junction to ambient
Tj(max) = maximum junction temperature
Tamb = ambient temperature
P = power dissipation
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Product data sheet
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SSL21081T
NXP Semiconductors
Compact non-dimmable LED driver IC
9. Limiting values
Table 5.
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
Ptot
total power dissipation
SO8 package
-
0.6
W
Tamb
ambient temperature
40
+125
C
Tj
junction temperature
40
+150
C
Tstg
storage temperature
55
+150
C
0.4
+20
V
0.4
+300
V
Voltages
continuous
[1]
VCC
supply voltage
VDRAIN
voltage on pin DRAIN
VHV
voltage on pin HV
current limited
0.4
+300
V
VSOURCE
voltage on pin SOURCE
current limited
0.4
+5.2
V
VNTC
voltage on pin NTC
current limited
0.4
+5.2
V
IDD
supply current
at pin VCC
-
20
mA
IDRAIN
current on pin DRAIN
2
+2
A
ISOURCE
current on pin SOURCE
2
+2
A
IDVDT
current on pin DVDT
duration 20 s
maximum
-
1.3
A
VESD
electrostatic discharge
voltage
human body model;
pins DRAIN and HV
1
+1
kV
2
+2
kV
500
+500
V
Currents
[2]
[3]
human body model;
all other pins
charged device
[4]
[1]
The current into the VCC pin must not exceed the maximum IDD 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 6.
Thermal characteristics
Symbol Parameter
Rth(j-a)
j-top
thermal resistance from junction to ambient
thermal characterization parameter from
junction to top of package
SSL21081T
Product data sheet
Conditions
Typ
Unit
in free air; SO8 package, PCB: 2 cm 3 cm,
2-layer, 35 m Cu per layer
142
K/W
in free air; SO8 package; PCB: JEDEC 2s2p
72
K/W
top package temperature measured at the
warmest point on top of the case; SO8 package
3.4
K/W
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SSL21081T
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Compact non-dimmable LED driver IC
11. Characteristics
Table 7.
Characteristics
Values specified at Tamb = 25 C unless otherwise stated; all voltages are measured with respect to ground; currents are
positive. when flowing into the IC.
Symbol
Parameter
fconv
conversion frequency
Conditions
Min
Typ
Max
Unit
-
100
-
kHz
High-voltage
Ileak(DRAIN)
leakage current on pin DRAIN
VDRAIN = 300 V (DC)
-
-
10
A
Ileak(HV)
leakage current on pin HV
VHV = 300 V (DC)
-
-
30
A
VCC
supply voltage
operating range
8
-
16
V
VCC(startup)
start-up supply voltage
11
12
13
V
VCC(stop)
stop supply voltage
8
9
10
V
VCC(hys)
hysteresis of supply voltage
VCC(rst)
reset supply voltage
VCC(swon)reg
regulator switch-on supply
voltage
VCC(swoff)reg
VCC(reg)hys
Supply
2
-
-
V
4.5
5
5.5
V
insufficient dV/dt supply
8.75
9.25
9.75
V
regulator switch-off supply
voltage
insufficient dV/dt supply
9.5
10
10.5
V
regulator supply voltage
hysteresis
VCC(swoff)reg VCC(swon)reg
0.3
-
-
V
VCC(swon)reg VCC(stop)
0.3
-
-
V
VCC(regswon-stop) supply voltage difference
between regulator switch-on and
stop
between VCC(startup) and VCC(stop)
[1]
Consumption
Istb(HV)
standby current on pin HV
during start-up or in protection;
VHV = 100 V
300
350
400
A
ICC
supply current
normal operation
-
1.3
-
mA
high supply current on pin HV
Standby: VHV = 40 V;
VCC < VCC(stop)
1
1.3
1.6
mA
Regulator On: VHV = 40 V;
VCC < VCC(swon)reg after start-up
2
2.3
2.6
mA
overcurrent protection threshold
voltage on pin SOURCE
V/t = 0.1 V/s
480
500
520
mV
V/t = 0.1 V/s; VNTC = 0.325 V
230
250
270
mV
td(ocp-swoff)
delay time from overcurrent
protection to switch-off
V/t = 0.1 V/s
-
75
100
ns
tleb
leading edge blanking time
overcurrent protection
260
300
340
ns
short-winding protection
210
250
290
ns
between tleb for overcurrent
protection and short-winding
protection
30
50
-
ns
1.4
1.5
1.6
V
Capability
Isup(high)HV
Current and SWP protection
Vth(ocp)SOURCE
tleb
leading edge blanking time
difference
Vth(swp)SOURCE
short-winding protection
threshold voltage on pin
SOURCE
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Product data sheet
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Compact non-dimmable LED driver IC
Table 7.
Characteristics …continued
Values specified at Tamb = 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
30
20
10
V/s
200
550
1000
kHz
15
20
25
V
-
100
-
ns
12.5
15
17.5
s
300
-
-
V
2.05
2.3
2.55
Valley detection
(V/t)vrec
valley recognition voltage change on pin DRAIN
with time
fring
ringing frequency
Vvrec(min)
minimum valley recognition
voltage difference
td(vrec-swon)
valley recognition to switch-on
delay time
[2]
voltage drop on pin DRAIN
Brownout detection
ton(high)
high on-time
MOSFET output stage
VBR(DRAIN)
breakdown voltage on pin DRAIN Tj > 0 C
RDSon
drain-source on-state resistance
dV/dt)f(DRAIN)
fall rate of change of voltage on
pin DRAIN
Tj = 25 C
Tj = 125 C
CDRAIN = 150 pF, RSOURCE = 2.2
[2]
3.05
3.45
3.85
-
1.2
-
V/ns
0.5
0.53
V
NTC functionality
Vth(high)NTC
high threshold voltage on pin
NTC
0.47
Vth(low)NTC
low threshold voltage on pin NTC
0.325 0.35
0.375 V
Vact(tmr)NTC
timer activation voltage on pin
NTC
0.26
0.29
0.325 V
Vdeact(tmr)NTC
timer deactivation voltage on pin
NTC
0.17
0.2
0.23
V
tto(deact)NTC
deactivation time-out time on pin
NTC
33
46
59
s
Ioffset(NTC)
offset current on pin NTC
-
47
-
A
tdet(sc)
short-circuit detection time
16
20
24
ms
toff(high)
high off-time
30
36
42
s
OSP
Temperature protections
Tth(act)otp
overtemperature protection
activation threshold temperature
160
170
180
C
Tth(rel)otp
overtemperature protection
release threshold temperature
90
100
110
C
[1]
An internal clamp sets the supply voltage. The current into the VCC pin must not exceed the maximum IDD value (see Table 5).
[2]
This parameter is not tested during production, by design it is guaranteed.
SSL21081T
Product data sheet
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Compact non-dimmable LED driver IC
12. SSL21081T buck configuration
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&
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1
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Fig 7.
SSL21081T
Product data sheet
Buck configuration for SSL21081T
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Compact non-dimmable LED driver IC
13. Package outline
SO8: plastic small outline package; 8 leads; body width 3.9 mm
SOT96-1
D
E
A
X
c
y
HE
v M A
Z
5
8
Q
A2
A
(A 3)
A1
pin 1 index
θ
Lp
1
L
4
e
detail X
w M
bp
0
2.5
5 mm
scale
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
UNIT
A
max.
A1
A2
A3
bp
c
D (1)
E (2)
e
HE
L
Lp
Q
v
w
y
Z (1)
mm
1.75
0.25
0.10
1.45
1.25
0.25
0.49
0.36
0.25
0.19
5.0
4.8
4.0
3.8
1.27
6.2
5.8
1.05
1.0
0.4
0.7
0.6
0.25
0.25
0.1
0.7
0.3
inches
0.069
0.010 0.057
0.004 0.049
0.01
0.019 0.0100
0.014 0.0075
0.20
0.19
0.16
0.15
0.05
0.01
0.01
0.004
0.028
0.012
0.244
0.039 0.028
0.041
0.228
0.016 0.024
θ
8o
o
0
Notes
1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.
2. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included.
Fig 8.
REFERENCES
OUTLINE
VERSION
IEC
JEDEC
SOT96-1
076E03
MS-012
JEITA
EUROPEAN
PROJECTION
ISSUE DATE
99-12-27
03-02-18
Package outline SOT96-1 (SOT8)
SSL21081T
Product data sheet
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Compact non-dimmable LED driver IC
14. Abbreviations
Table 8.
Abbreviations
Acronym
Description
BCM
Boundary Conduction Mode
BOM
Bill Of Materials
LED
Light Emitting Diode
LEB
Leading-Edge Blanking
MOSFET
Metal-Oxide Semiconductor Field-Effect Transistor
OCP
OverCurrent Protection
OSP
Output Short Protection
OTP
OverTemperature Protection
PCB
Printed-Circuit Board
PWM
Pulse-Width Modulation
SWP
Short-Winding Protection
UVLO
UnderVoltage LockOut
ZCS
Zero Current Switching
15. References
SSL21081T
Product data sheet
[1]
AN11041 — SSL21081, SSL21083, and SSL2109 non-dimmable buck converter in
low ripple configurations
[2]
AN11263 — 230 V (AC) mains dimmable LED driver using the SSL2129AT or
SSL21084AT
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Compact non-dimmable LED driver IC
16. Revision history
Table 9.
Revision history
Document ID
Release date
Data sheet status
Change notice Supersedes
SSL21081T v.6
20131003
Product data sheet
-
Modifications:
•
SSL21081_SSL21083 v.5
Text and graphics have been updated throughout the data sheet.
SSL21081_SSL21083 v.5
20121011
Product data sheet
-
SSL2108_SER v.4
SSL2108_SER v.4
20120508
Product data sheet
-
SSL21081T_2T_3T_4T v.3.1
SSL21081T_2T_3T_4T v.3.1 20120222
Product data sheet
-
SSL21081T_2T_3T_4T v.3
SSL21081T_2T_3T_4T v.3
Product data sheet
-
SSL21081T_2T_3T_4T v.2
20120214
SSL21081T_2T_3T_4T v.2
20111206
Preliminary data sheet
-
SSL2108X v.1
SSL2108X v.1
20110909
Preliminary data sheet
-
-
SSL21081T
Product data sheet
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Compact non-dimmable LED driver IC
17. Legal information
17.1 Data sheet status
Document status[1][2]
Product status[3]
Definition
Objective [short] data sheet
Development
This document contains data from the objective specification for product development.
Preliminary [short] data sheet
Qualification
This document contains data from the preliminary specification.
Product [short] data sheet
Production
This document contains the product specification.
[1]
Please consult the most recently issued document before initiating or completing a design.
[2]
The term ‘short data sheet’ is explained in section “Definitions”.
[3]
The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nxp.com.
17.2 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. NXP Semiconductors does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liability for the consequences of
use of such information.
Short data sheet — A short data sheet is an extract from a full data sheet
with the same product type number(s) and title. A short data sheet is intended
for quick reference only and should not be relied upon to contain detailed and
full information. For detailed and full information see the relevant full data
sheet, which is available on request via the local NXP Semiconductors sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall prevail.
Product specification — The information and data provided in a Product
data sheet shall define the specification of the product as agreed between
NXP Semiconductors and its customer, unless NXP Semiconductors and
customer have explicitly agreed otherwise in writing. In no event however,
shall an agreement be valid in which the NXP Semiconductors product is
deemed to offer functions and qualities beyond those described in the
Product data sheet.
17.3 Disclaimers
Limited warranty and liability — Information in this document is believed to
be accurate and reliable. However, NXP Semiconductors does not give any
representations or warranties, expressed or implied, as to the accuracy or
completeness of such information and shall have no liability for the
consequences of use of such information. NXP Semiconductors takes no
responsibility for the content in this document if provided by an information
source outside of NXP Semiconductors.
In no event shall NXP Semiconductors be liable for any indirect, incidental,
punitive, special or consequential damages (including - without limitation - lost
profits, lost savings, business interruption, costs related to the removal or
replacement of any products or rework charges) whether or not such
damages are based on tort (including negligence), warranty, breach of
contract or any other legal theory.
Notwithstanding any damages that customer might incur for any reason
whatsoever, NXP Semiconductors’ aggregate and cumulative liability towards
customer for the products described herein shall be limited in accordance
with the Terms and conditions of commercial sale of NXP Semiconductors.
Right to make changes — NXP Semiconductors reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all information supplied prior
to the publication hereof.
SSL21081T
Product data sheet
Suitability for use — NXP Semiconductors products are not designed,
authorized or warranted to be suitable for use in life support, life-critical or
safety-critical systems or equipment, nor in applications where failure or
malfunction of an NXP Semiconductors product can reasonably be expected
to result in personal injury, death or severe property or environmental
damage. NXP Semiconductors and its suppliers accept no liability for
inclusion and/or use of NXP Semiconductors products in such equipment or
applications and therefore such inclusion and/or use is at the customer’s own
risk.
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. NXP Semiconductors makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Customers are responsible for the design and operation of their applications
and products using NXP Semiconductors products, and NXP Semiconductors
accepts no liability for any assistance with applications or customer product
design. It is customer’s sole responsibility to determine whether the NXP
Semiconductors product is suitable and fit for the customer’s applications and
products planned, as well as for the planned application and use of
customer’s third party customer(s). Customers should provide appropriate
design and operating safeguards to minimize the risks associated with their
applications and products.
NXP Semiconductors does not accept any liability related to any default,
damage, costs or problem which is based on any weakness or default in the
customer’s applications or products, or the application or use by customer’s
third party customer(s). Customer is responsible for doing all necessary
testing for the customer’s applications and products using NXP
Semiconductors products in order to avoid a default of the applications and
the products or of the application or use by customer’s third party
customer(s). NXP does not accept any liability in this respect.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) will cause permanent
damage to the device. Limiting values are stress ratings only and (proper)
operation of the device at these or any other conditions above those given in
the Recommended operating conditions section (if present) or the
Characteristics sections of this document is not warranted. Constant or
repeated exposure to limiting values will permanently and irreversibly affect
the quality and reliability of the device.
Terms and conditions of commercial sale — NXP Semiconductors
products are sold subject to the general terms and conditions of commercial
sale, as published at http://www.nxp.com/profile/terms, unless otherwise
agreed in a valid written individual agreement. In case an individual
agreement is concluded only the terms and conditions of the respective
agreement shall apply. NXP Semiconductors hereby expressly objects to
applying the customer’s general terms and conditions with regard to the
purchase of NXP Semiconductors products by customer.
No offer to sell or license — Nothing in this document may be interpreted or
construed as an offer to sell products that is open for acceptance or the grant,
conveyance or implication of any license under any copyrights, patents or
other industrial or intellectual property rights.
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 3 October 2013
© NXP B.V. 2013. All rights reserved.
20 of 22
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Compact non-dimmable LED driver IC
Export control — This document as well as the item(s) described herein
may be subject to export control regulations. Export might require a prior
authorization from competent authorities.
Quick reference data — The Quick reference data is an extract of the
product data given in the Limiting values and Characteristics sections of this
document, and as such is not complete, exhaustive or legally binding.
Non-automotive qualified products — Unless this data sheet expressly
states that this specific NXP Semiconductors product is automotive qualified,
the product is not suitable for automotive use. It is neither qualified nor tested
in accordance with automotive testing or application requirements. NXP
Semiconductors accepts no liability for inclusion and/or use of
non-automotive qualified products in automotive equipment or applications.
In the event that customer uses the product for design-in and use in
automotive applications to automotive specifications and standards, customer
(a) shall use the product without NXP Semiconductors’ warranty of the
product for such automotive applications, use and specifications, and (b)
whenever customer uses the product for automotive applications beyond
NXP Semiconductors’ specifications such use shall be solely at customer’s
own risk, and (c) customer fully indemnifies NXP Semiconductors for any
liability, damages or failed product claims resulting from customer design and
use of the product for automotive applications beyond NXP Semiconductors’
standard warranty and NXP Semiconductors’ product specifications.
Translations — A non-English (translated) version of a document is for
reference only. The English version shall prevail in case of any discrepancy
between the translated and English versions.
17.4 Trademarks
Notice: All referenced brands, product names, service names and trademarks
are the property of their respective owners.
GreenChip — is a trademark of NXP B.V.
18. Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
SSL21081T
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.
21 of 22
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Compact non-dimmable LED driver IC
19. Contents
1
2
3
4
5
5.1
6
7
7.1
7.2
8
8.1
8.2
8.3
8.3.1
8.3.2
8.3.3
8.3.4
8.3.5
8.3.6
8.3.7
8.4
8.5
8.6
8.7
8.7.1
8.8
9
10
11
12
13
14
15
16
17
17.1
17.2
17.3
17.4
18
19
General description . . . . . . . . . . . . . . . . . . . . . . 1
Features and benefits . . . . . . . . . . . . . . . . . . . . 1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Quick reference data . . . . . . . . . . . . . . . . . . . . . 3
Ordering information . . . . . . . . . . . . . . . . . . . . . 3
Ordering options . . . . . . . . . . . . . . . . . . . . . . . . 3
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pinning information . . . . . . . . . . . . . . . . . . . . . . 5
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5
Functional description . . . . . . . . . . . . . . . . . . . 6
Converter operation . . . . . . . . . . . . . . . . . . . . . 6
Valley detection. . . . . . . . . . . . . . . . . . . . . . . . . 7
Protective features . . . . . . . . . . . . . . . . . . . . . . 8
UnderVoltage LockOut (UVLO) . . . . . . . . . . . . 8
Leading-Edge Blanking (LEB) . . . . . . . . . . . . . 8
OverCurrent Protection (OCP) . . . . . . . . . . . . . 8
OverTemperature Protection (OTP) . . . . . . . . . 8
Brownout protection . . . . . . . . . . . . . . . . . . . . . 9
Short-Winding Protection (SWP) . . . . . . . . . . . 9
Output Short-circuit Protection (OSP). . . . . . . . 9
VCC supply. . . . . . . . . . . . . . . . . . . . . . . . . . . 10
DVDT pin supply (dV/dt) . . . . . . . . . . . . . . . . . 10
VCC regulator . . . . . . . . . . . . . . . . . . . . . . . . . 10
NTC functionality and PWM regulation. . . . . . 10
Soft-start function . . . . . . . . . . . . . . . . . . . . . . 11
Heat sink. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 13
Thermal characteristics . . . . . . . . . . . . . . . . . 13
Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 14
SSL21081T buck configuration . . . . . . . . . . . 16
Package outline . . . . . . . . . . . . . . . . . . . . . . . . 17
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 18
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Revision history . . . . . . . . . . . . . . . . . . . . . . . . 19
Legal information. . . . . . . . . . . . . . . . . . . . . . . 20
Data sheet status . . . . . . . . . . . . . . . . . . . . . . 20
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Contact information. . . . . . . . . . . . . . . . . . . . . 21
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
© NXP B.V. 2013.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
Date of release: 3 October 2013
Document identifier: SSL21081T
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