SSL8516T
Greenchip PFC and flyback controller
Rev. 1 — 5 May 2014
Product data sheet
1. General description
The GreenChip is the latest generation of green Switched Mode Power Supply (SMPS)
controller ICs. The SSL8516T combines a controller for Power Factor Correction (PFC)
and a flyback controller. Its high level of integration enables cost-effective LED lighting
application power supply design using a very low number of external components.
The PFC operates in Quasi-Resonant (QR) or Discontinuous Conduction Mode (DCM),
with valley switching.
The specially built-in green functions provide high efficiency at all power levels. At high
power levels, the flyback operates in QR mode or DCM with valley detection. At medium
power levels, the flyback controller switches to Frequency Reduction (FR) mode and limits
the peak current to an adjustable minimum value. It ensures high efficiency while
minimizing the audible noise from the transformer. In low-power mode, the PFC switches
off to maintain high efficiency. Valley switching is used in all operating modes.
The SSL8516T is a Multi-Chip Module (MCM), containing two chips. The proprietary
high-voltage BCD800 process makes direct start-up possible from the rectified universal
mains voltage in an effective and green way. The second low voltage Silicon-On-Insulator
(SOI) is used for accurate, high-speed protection functions and control.
The SSL8516T enables easy design of highly efficient and reliable LED lighting
application power supplies between 25 W and 300 W.
LED drivers in particular benefit from the high level of integration. The IC meets the
lighting class C requirements on mains current harmonics as specified by IEC 61000-3-2
over a wide input voltage range and a wide output power range.
Remark:
All values in this document are typical values unless otherwise stated.
NXP Semiconductors
SSL8516T
Greenchip PFC and flyback controller
2. Features and benefits
2.1 Distinctive features
Integrated PFC and flyback controller
Universal mains supply operation between 90 V (AC) to 305 V (AC)
Fixed boost PFC with accurate maximum output voltage (NXP Semiconductors
patented)
High level of integration, results in cost-effective designs with very low external
component counts
Adjustable PFC switch off delay
External PFC switch on and switch off override
Accurate PFC switch on and switch off control (NXP Semiconductors patent pending)
2.2 Green features
On-chip start-up current source
Power-down functionality for very low standby power
2.3 PFC green features
Valley/Zero-Voltage Switching (ZVS) for minimum switching losses
(NXP Semiconductors patented)
Frequency limitation reduces switching losses
PFC switched off when a low-load is detected at the flyback output
2.4 Flyback green features
Valley switching for minimum switching losses (NXP Semiconductors patented)
Frequency reduction with adjustable minimum peak current at low-power operation
maintains high-efficiency at low output power levels
2.5 Protection features
Safe restart mode for system fault conditions
Continuous mode protection using demagnetization detection for both converters
(NXP Semiconductors patented)
UnderVoltage Protection (UVP) (foldback during overload)
Accurate OverVoltage Protection (OVP) for both converters (adjustable for flyback
converter)
Mains voltage independent OverPower Protection (OPP)
Open control loop protection for both converters. The open-loop protection on the
flyback converter is safe restart
OverTemperature Protection (OTP)
Low and adjustable OverCurrent Protection (OCP) trip level for both converters
General-purpose input for latched protection, for use with system OverTemperature
Protection (OTP)
SSL8516T
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 1 — 5 May 2014
2 of 33
NXP Semiconductors
SSL8516T
Greenchip PFC and flyback controller
3. Applications
This IC can be used in all lighting applications requiring efficient and cost-effective
AC-DC offline switch mode power solutions from 25 W to 300 W.
4. Ordering information
Table 1.
Ordering information
Package
Name
SSL8516T
SO16
Description
plastic small outline package; 16 leads; body width 3.9 mm
Version
SOT109-1
Type number
5. Block diagram
Fig 1.
SSL8516T block diagram
SSL8516T
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 1 — 5 May 2014
3 of 33
NXP Semiconductors
SSL8516T
Greenchip PFC and flyback controller
6. Pinning information
6.1 Pinning
Fig 2.
SSL8516T pin configuration (SOT109-1)
6.2 Pin description
Table 2.
Symbol
V
CC
GND
FBCTRL
FBAUX
LATCH
PFCCOMP
VINSENSE
PFCAUX
VOSENSE
FBSENSE
PFCSENSE
PFCDRIVER
FBDRIVER
PFCTIMER
HVS
HV
Pin description
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Description
supply voltage
ground
flyback control input
auxiliary winding input for demagnetization timing and flyback OVP
general-purpose protection input
PFC frequency compensation
mains voltage sense input
auxiliary winding input for demagnetization timing of the PFC
sense input for PFC output voltage
flyback current sense input
PFC current sense input
PFC gate-driver output
flyback gate-driver output
PFC override and switch-off delay timer
high-voltage safety spacer; not connected
high-voltage start-up and flyback valley sensing
SSL8516T
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 1 — 5 May 2014
4 of 33
NXP Semiconductors
SSL8516T
Greenchip PFC and flyback controller
7. Functional description
7.1 General control
The SSL8516T contains a power factor correction circuit controller and a flyback circuit
controller. A typical configuration is shown in
Figure 3.
(1) The HV pin can either be connected to the center tap of the flyback transformer or to the drain of MOSFET S2.
Fig 3.
A typical SSL8516T configuration
7.1.1 Start-up and UnderVoltage LockOut (UVLO)
Initially, the capacitor on the V
CC
pin is charged from the high-voltage mains using the HV
pin.
When V
CC
is less than V
trip
, the charge current is I
ch(low)
. This low current protects the IC if
the V
CC
pin is shorted to ground. To ensure a short start-up time, the charge current above
the V
trip
level is increased to I
ch(high)
, until V
CC
reaches V
startup
. Except during start-up,
when V
CC
is between V
th(UVLO)
and V
startup
, the charge current becomes I
ch(low)
to ensure
a low safe restart duty cycle during fault conditions.
When V
CC
is lowered to 2 V, the IC is reset. During the next start-up, the charge current
between V
th(UVLO)
and V
startup
is I
ch(high)
.
SSL8516T
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 1 — 5 May 2014
5 of 33
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