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PDF SSL4101T Data sheet ( Hoja de datos )
| Número de pieza | SSL4101T | |
| Descripción | GreenChip III SMPS control IC | |
| Fabricantes | NXP Semiconductors | |
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SSL4101T
GreenChip III+ SMPS control IC
Rev. 1 — 21 April 2011
Product data sheet
1. General description
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The GreenChip III+ is the third generation of green Switched Mode Power Supply (SMPS)
controller ICs. The SSL4101T combines a controller for Power Factor Correction (PFC)
and a flyback controller. Its high level of integration allows the design of a cost-effective
LED lighting application power supply with a very low number of external components.
The special built-in green functions provide high efficiency at all power levels. This applies
to quasi-resonant operation at high power levels, quasi-resonant operation with valley
skipping, as well as to reduced frequency operation at lower power levels. At low power
levels, the PFC switches off to maintain high efficiency.
During low power conditions, the flyback controller switches to frequency reduction mode
and limits the peak current to 25 % of its maximum value. This will ensure high efficiency
at low power and good standby power performance while minimizing audible noise from
the transformer.
The SSL4101T is a MultiChip Module, (MCM), containing two chips. The proprietary high
voltage BCD800 process which makes direct start-up possible from the rectified universal
mains voltage in an effective and green way. The second low voltage SiIlicon On Insulator
(SIO) is used for accurate, high speed protection functions and control.
The SSL4101T enables extremely efficient and reliable LED lighting application power
supplies with power requirements from 10 W to 300 W, to be designed easily and with a
minimum number of external components.
The new SSL4101T allows a typical 150 W LED lighting application power supply
(universal input, 48 V (DC) output, TEA1761T on the secondary side for Synchronous
Rectification) to achieve the following performances at full load:
• 120 V (AC): 92 % efficiency, 0.998 PF, 5.8 % THD, < 190 mW standby power
• 277 V (AC): 94 % efficiency, 0.978 PF, 9 % THD, < 350 mW standby power
1.1 Industry standard THD, low standby input power and high-efficiency
The SSL4101T enables LED lighting application power supplies to achieve the industry
standard of < 20 % THD for the input current at full load and all nominal input voltages:
100 V (AC), 120 V (AC), 230 V (AC), 240 V (AC) and 277 V (AC).
• Extremely low input power in Standby mode eliminates the need for an additional
housekeeping power supply to power the lighting controllers/dimmers.
1 page  
NXP Semiconductors
SSL4101T
GreenChip III+ SMPS control IC
7. Functional description
7.1 General control
The SSL4101T contains a controller for a power factor correction circuit as well as a
controller for a flyback circuit. A typical configuration is shown in Figure 3.
12 11
8
6
9 16 13
10
SSL4101T
7
4
31
5
2
www.DataSheet4U.net
001aan673
Fig 3. Typical configuration
7.1.1 Start-up and UnderVoltage LockOut (UVLO)
Initially the capacitor on the VCC pin is charged from the high voltage mains via the HV pin.
As long as VCC is below Vtrip, the charge current is low. This protects the IC if the VCC pin
is shorted to ground. For a short start-up time the charge current above Vtrip is increased
until VCC reaches Vth(UVLO). If VCC is between Vth(UVLO) and Vstartup, the charge current is
low again, ensuring a low duty cycle during fault conditions.
The control logic activates the internal circuitry and switches off the HV charge current
when the voltage on pin VCC passes the Vstartup level. First, the LATCH pin current source
is activated and the soft start capacitors on the PFCSENSE and FBSENSE pins are
charged. When the LATCH pin voltage exceeds the Ven(LATCH) voltage and the soft start
capacitor on the PFCSENSE pin is charged, the PFC circuit is activated. Also the flyback
converter is activated (providing the soft start capacitor on the FBSENSE pin is charged).
The output voltage of the flyback converter is then regulated to its nominal output voltage.
The IC supply is taken over by the auxiliary winding of the flyback converter. See Figure 4.
If during start-up the LATCH pin does not reach the Ven(LATCH) level before VCC reaches
Vth(UVLO), the LATCH pin output is deactivated and the charge current is switched on
again.
SSL4101T
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 21 April 2011
© NXP B.V. 2011. All rights reserved.
5 of 29
5 Page 
NXP Semiconductors
SSL4101T
GreenChip III+ SMPS control IC
7.2.9 Overvoltage protection (VOSENSE pin)
To prevent output overvoltage during load steps and mains transients, an overvoltage
protection circuit is built in.
As soon as the voltage on the VOSENSE pin exceeds the Vovp(VOSENSE) level, switching
of the power factor correction circuit is inhibited. Switching of the PFC recommences as
soon as the VOSENSE pin voltage drops below the Vovp(VOSENSE) level again.
When the resistor between pin VOSENSE and ground is open, the overvoltage protection
is also triggered.
7.2.10 PFC open loop protection (VOSENSE pin)
The power factor correction circuit does not start switching until the voltage on the
VOSENSE pin is above the Vth(ol)(VOSENSE) level. This protects the circuit from open loop
and VOSENSE short situations.
7.2.11 Driver (PFCDRIVER pin)
The driver circuit to the gate of the power MOSFET has a current sourcing capability of
typically −500 mA and a current sink capability of typically 1.2 A. This permits fast turn-on
and turn-off of the power MOSFET for efficient operation.
7.3 Flyback controller
The SSL4101T includes a controller for a flyback converter. The flyback converter
operates in quasi-resonant or discontinuous conduction mode with valley switching. The
auxiliary winding of the flyback transformer provides demagnetization detection and
powers the IC after start-up.
7.3.1 Multimode operation
The SSL4101T flyback controller can operate in several modes; see Figure 6.
www.DataSheet4U.net
fsw(fb)max
PFC off
switching frequency
frequency
reduction
PFC on
discontinuous
with valley
switching
quasi resonant
Fig 6. Multimode operation flyback
output power
014aaa158
SSL4101T
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 21 April 2011
© NXP B.V. 2011. All rights reserved.
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