SSL5301T
Mains dimmable controller for LED lighting
Rev. 2 — 30 June 2014
Product data sheet
1. General description
The SSL5301T is a mains dimmable controller IC, intended to drive dimmable LEDs in
general lighting applications.
The main benefits of this IC include:
•
High dimmer compatibility
•
Selectable modes for high power factor or low ripple, allowing a wide LED power
range
•
•
•
•
•
•
•
Large dimming range
Single stage topology for small PCB footprint
Ease of design-in
Integrated start-up JFET
Low electronic Bill Of Material (BOM)
Supports multi-lamp applications
Various converter topologies supported
The IC drives an external switch for easy power scaling. It has been designed to start up
directly from the High-Voltage (HV) supply by an internal high-voltage current source.
Flyback, buck and buck-boost circuit topologies are supported. Primary side sensing
provides accurate output current control.
The IC can detect all known mains dimmer types and translate the dimmer setting to a
continuous LED current in multiple ways. It can operate in three switching modes at two
switching frequency ranges. It offers tradeoffs between the output current ripple, the
mains current Total Harmonic Distortion (THD) and the application size. The IC
incorporates all required protection features.
2. Features and benefits
LED controller IC for driving strings of LEDs or high-voltage LEDs from rectified mains
High-efficiency switch mode buck, flyback or buck-boost controller driving an external
power FET
Two maximum switching frequencies for highest efficiency or smallest application
size
Zero current switching at switch turn-on
Zero voltage or valley switching at switch turn-on
Selectable low THD or low LED current ripple modes
NXP Semiconductors
SSL5301T
Mains dimmable controller for LED lighting
Leading, trailing and intelligent dimmer detection
Two built-in dim curves
LED current accuracy within
4
% across variations in components and conditions
No binning on LED forward voltage required
Built-in Protections:
UnderVoltage LockOut (UVLO)
Leading Edge Blanking (LEB)
OverCurrent Protection (OCP)
Internal OverTemperature Protection (OTP)
Brownout protection
Output Short Protection (OSP)
Output open OverVoltage Protection (OVP)
Mains synchronization loss protection
Bleeder dissipation protection
Low component count LED driver solution
Compatible with wall switches with built-in indication light during standby
Operates well in multiple-lamp arrangements
IC lifetime matches or surpasses LED lamp lifetime
3. Applications
Compact mains dimmable LED lamps with accurate, dimmable current output for
single mains voltages, including 100 V (AC), 120 V (AC) and 230 V (AC). External
components determine the power level. The power level ranges from 4 W to over
25 W. Applications fit in common form factors like PAR, GU10, A19, and the candle
form factor.
4. Quick reference data
Table 1.
Symbol
V
CC
f
sw
Quick reference data
Parameter
supply voltage
switching frequency
low-frequency mode;
undimmed
50 Hz mains
60 Hz mains
high-frequency mode;
undimmed
50 Hz mains
60 Hz mains
I
CC
V
I(DRAIN)
V
o(PWRDRV)
supply current
input voltage on pin
DRAIN
output voltage on pin
PWRDRV
normal operation
not repetitive
high level
84
101
-
-
-
91
109
2.25
-
10.7
98
117
-
700
-
kHz
kHz
mA
V
V
55
66
60
72
65
78
kHz
kHz
Conditions
Min
8.8
Typ
-
Max
32
Unit
V
SSL5301T
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 2 — 30 June 2014
2 of 22
NXP Semiconductors
SSL5301T
Mains dimmable controller for LED lighting
5. Ordering information
Table 2.
Ordering information
Package
Name
SSL5301T
SO8
Description
plastic small package outline body; 8 leads; body width 3.9 mm
Version
SOT96-1
Type number
6. Block diagram
Fig 1.
SSL5301T block diagram
7. Pinning information
7.1 Pinning
Fig 2.
SSL5301T pinning diagram
SSL5301T
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 2 — 30 June 2014
3 of 22
NXP Semiconductors
SSL5301T
Mains dimmable controller for LED lighting
7.2 Pin description
Table 3.
Symbol
RMAINS
VCC
BLDRV
BLS
ISNS
PWRDRV
GND
DRAIN
Pin description
Pin
1
2
3
4
5
6
7
8
Description
mains detection input
IC supply input/output
bleeder stage transistor drive output
bleeder loop sense
peak current sense input
external MOSFET gate driver output
ground
external MOSFET drain sense input
8. Functional description
8.1 Pin functionality
8.1.1 Pin RMAINS
The RMAINS pin takes in a current representing the rectified mains or dimmer output
voltage via the external RMAINS resistors. The low ohmic input results in current always
flowing, causing the voltage on the RMAINS pin to remain below the maximum V
i(RMAINS)
at any time.
The information about the mains voltage is used to set the dimming level and to shape the
output current waveform in LTHD modes. It is also used for internal timing
synchronizations, making it essential for low-ripple applications.
Some filtering may be required outside of the IC to eliminate incoming noise.
If the pin does not receive a rectified mains signal, the mains synchronization loss
protection is triggered.
8.1.2 Pin VCC
At power-up, the VCC pin and its capacitor are charged using the internal HV current
source from the DRAIN pin. Once V
CC
has reached V
CC(startup)
, switching starts and V
CC
supply is generated from the auxiliary winding. If V
CC
exceeds V
ovp(VCC)
due to, for
example, a disconnected output, OVP is triggered. If V
CC
drops to V
CC(low)
, the internal HV
current source is enabled. If V
CC
drops below V
CC(stop)
, UVLO protection is triggered.
Do not use the VCC pin to power additional circuitry outside the IC because no additional
current budget is guaranteed. An additional V
CC
load can affect product performance.
To support wall switches that include an indicator light, a predetermined current (I
CC
) is
pulled from the supply during a limited window of the VCC voltage (see condition 2 of I
CC
in
Table 7).
SSL5301T
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 2 — 30 June 2014
4 of 22
NXP Semiconductors
SSL5301T
Mains dimmable controller for LED lighting
8.1.3 Pin BLDRV
The BLDRV pin drives an external high-voltage NPN transistor stage. This stage is used
to generate additional load current for a dimmer (see
Section 8.2.6).
Or it is used to load
the mains during zero crossings when no dimmer is connected. It ensures proper mains
detection. The voltage range is adapted to bipolar transistors only. At low BLDRV output
voltage, the drive capability is reduced to limit current loss in case of bipolar transistor
saturation.
8.1.4 Pin BLS
The BLS pin senses the total application current for dimmer compatibility (bleed sense,
see
Section 8.2.6).
Remark:
A series resistor must be present between the BLS pin and the bleed loop sense
resistor. The series resistor prevents that the current flowing out of the pin exceeds the
limiting value, I
i(BLS)
.
8.1.5 Pin ISNS
The ISNS pin senses the voltage across the sense resistor, R
SNS
, generated by the
inductor current flowing through the external MOSFET and this resistor (see
Figure 3).
Optionally, a mode definition resistor is present between the pin and the current sense
resistor. At start-up, the mode resistor is measured using a current which is sourced out of
the pin.
8.1.6 Pin PWRDRV
The SSL5301T is equipped with a driver that controls an external MOSFET. The voltage
on the driver output pin is increased towards the maximum V
o(PWRDRV)
to open the switch
during the first cycle (t0 to t1; see
Figure 4).
It is pulled to ground from the start of the
secondary stroke until the next cycle starts (t1 to t00). During the transition from low to
high and back, the switching slope is controlled, limiting the high-frequency radiation.
8.1.7 Pin DRAIN
The DRAIN pin is used to derive energy to charge the VCC pin at start-up and after
switching is stopped because of a triggered protection. The signal at the DRAIN pin is
used to detect the occurrence of demagnetization. It is also used to determine the valley
of the ringing voltage for starting the primary stroke.
8.2 Converter operation
8.2.1 Available modes
The SSL5301T incorporates various built-in operation modes which can be selected in the
application using a maximum of three external resistors. At start-up, the value of these
resistors is detected and the corresponding operation mode is set.
Mode resistors R
TF
and R
DIM
at the PWRDRV and BLDRV pins are connected between
the pin and ground. Mode resistor R
CTRL
at the ISNS pin is connected between the pin
and the external MOSFET source (see
Figure 3).
SSL5301T
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 2 — 30 June 2014
5 of 22
京公网安备 11010802033920号
EEWORLD
