SSL5018TE
Compact non-dimmable LED driver IC
Rev. 2 — 26 February 2014
Product data sheet
1. General description
The SSL5018TE is a high-voltage Integrated Circuit (IC) controller with an integrated
MOSFET for driving LED lamps in general mains non-dimmable lighting applications. The
IC operates with input voltages up to 230 V (AC).
The main benefits of these products are:
•
•
•
•
Small Printed-Circuit Board (PCB) footprint, and compact solution
High efficiency (up to 93 %)
High input power factor (> 0.95); Low Total Harmonic Distortion (THD; < 20 %)
Intermediate power factor (PF > 0.7); low ripple (< 5 %); minimum external
component count
•
Enhanced power capability
•
Low electronic Bill Of Material (BOM)
The SSL5018TE operates in Boundary Conduction Mode (BCM) with peak current
modulation, providing an input power factor correction. The IC is typically configured to a
buck converter. It can start up directly from the HV pin using an internal high-voltage
current source. When the converter is switching, V
CC
is supplied through the DVDT pin by
a capacitor coupled to the DRAIN pin or by an auxiliary supply. This feature simplifies the
V
CC
supply. It allows a low-cost off-the-shelf inductor to be used, providing flexibility in
application design. The IC supply current is 1.3 mA.
The SSL5018TE comes in a compact HSO8 package incorporating an exposed pad to
enhance the thermal capability for high-power applications, like 18 W T-LEDs or higher
power lamps.
2. Features and benefits
Driving LED strings from a rectified mains supply
Highly integrated switch mode LED driver with integrated 600 V (DC) power switches
Efficient BCM 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 peak current mode control:
NXP Semiconductors
SSL5018TE
Compact non-dimmable LED driver IC
No overshoots or undershoots in the LED current
Internal protections:
UnderVoltage LockOut (UVLO)
Leading-Edge Blanking (LEB)
OverCurrent Protection (OCP)
Internal OverTemperature Protection (OTP)
Brownout protection
Output Short Protection (OSP)
Low BOM LED driver solution (see
Figure 3):
No Schottky diode required due to ZCS
Option for soft-start function
Compatible with wall switches with built-in standby indicator lights
1
IC lifetime meets and exceeds the required LED lamp lifetime
3. Applications
The SSL5018TE is intended for low-cost mains non-dimmable LED lighting applications,
including 18 W T-LEDs or higher power lamps, with a high power factor. The IC operates
from 100 V (AC) or 120 V (AC) mains voltages. The output current can be modulated
using a PWM signal.
4. Quick reference data
Table 1.
Symbol
V
CC
R
DSon
f
conv
I
DRAIN
V
DRAIN
[1]
Quick reference data
Parameter
supply voltage
drain-source on-state
resistance
conversion frequency
current on pin DRAIN
voltage on pin DRAIN
Conditions
operating range
T
j
= 25
C
T
j
= 125
C
[1]
Min
8
4
6
-
1.2
0.4
Typ
-
5
7.5
100
-
-
Max
15
6
9
-
+1.2
600
Unit
V
kHz
A
V
An internal clamp sets the supply voltage. The current into the VCC pin must not exceed the maximum I
DD
value (see
Table 5).
5. Ordering information
Table 2.
Ordering information
Package
Name
SSL5018TE
HSO8
Description
plastic small package outline body; 8 leads; body
width 3.9 mm
Version
SOT786-3
Type number
1.
The Hotaru switch is a known wall switch with built-in light
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2014. All rights reserved.
SSL5018TE
Product data sheet
Rev. 2 — 26 February 2014
2 of 20
NXP Semiconductors
SSL5018TE
Compact non-dimmable LED driver IC
Ordering options
Input voltage
100 V; 120 V; 230 V
Internal MOSFET
characteristics
600 V (DC); 5
Package
HSO8
Table 3.
Type
SSL5018TE
6. Block diagram
Fig 1.
SSL5018TE block diagram
SSL5018TE
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© NXP B.V. 2014. All rights reserved.
Product data sheet
Rev. 2 — 26 February 2014
3 of 20
NXP Semiconductors
SSL5018TE
Compact non-dimmable LED driver IC
7. Pinning information
7.1 Pinning
Fig 2.
SSL5018TE pin configuration (HSO8)
7.2 Pin description
Table 4.
Symbol
HV
SOURCE1
SOURCE2
VCC
NTC
DVDT
GND
DRAIN
Pin description
Pin (SO8)
1
2
3
4
5
6
7
8
Description
high-voltage supply pin
internal MOSFET source
current sensing source
supply voltage
LED temperature protection input
capacitor switching supply pin
ground
internal MOSFET drain
SSL5018TE
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2014. All rights reserved.
Product data sheet
Rev. 2 — 26 February 2014
4 of 20
NXP Semiconductors
SSL5018TE
Compact non-dimmable LED driver IC
8. Functional description
8.1 Converter operation
The converter in the SSL5018TE is a BCM, peak current controlled system.
Figure 3
shows the basic application diagram.
Figure 4
shows the waveforms. This converter
operates at the boundary between continuous and discontinuous modes. Energy is stored
in inductor L when the MOSFET is switched on. The inductor current I
L
is zero when the
internal MOSFET is switched on at t
0
. Thereafter, the amplitude of the current builds up in
L proportionally with V
IN
V
OUT
and the time that the internal MOSFET is on (t
0
to t
1
). The
peak current sensed at the SOURCE2 pin determines when the MOSFET is switched off.
When the internal MOSFET switches off at t
1
, the current flows through the freewheeling
diode and the output capacitor (t
2
to t
3
). The current then drops at a rate proportional to
the value of V
OUT
. When the inductor current reaches zero, after a short delay (t
3
to t
00
), a
new switching cycle is started when the MOSFET is switched on again.
Fig 3.
Basic SSL5018TE application diagram
8.2 Valley detection
After the inductor current decreases to zero at t
3
, the drain voltage starts to oscillate
around the V
IN
V
OUT
level, with an amplitude equal to V
OUT
. A special feature called
valley detection is integrated in the SSL5018TE circuitry. The dedicated valley detection
circuitry connected to the DRAIN pin senses when the voltage on the drain of the switch
reaches its lowest level (valley). When the valley is detected, the switch is turned on
again. The next switching cycle is started. As a result, the switch-on switching losses are
reduced.
If both the frequency of the oscillations and the voltage swing are within the range
specified (f
ring
and
∆V
vrec(min)
) for detection, a valley is detected and accepted. If a valid
valley is not detected, the switch is kept off until the maximum off-time (t
off(high)
) is
reached. Then the next switching cycle is started.
SSL5018TE
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2014. All rights reserved.
Product data sheet
Rev. 2 — 26 February 2014
5 of 20
