/a>LED” title=”LED”>LED” title=”LED”>LED lighting application. This article introduces the main features and advantages of the SSL4101T, block diagram, typical configuration diagram and application circuit diagram, and the main features of the SSL4101DB02 quad LED driver demo board and specifications, circuit diagrams, bill of materials.
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
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.
• Using SSL4101T, a low power controller (< 50 mW) can be driven directly by the LED lighting application power supply's output while maintaining the input power in Standby mode below the maximum of 0.5 W.
• Extremely high-efficiency can be achieved in LED lighting application power supplies using the SSL4101T (between 92 % to 94 %). This enables the power supply to operate reliably in enclosed spaces with very little cooling (which is typical for SSL applications).
SSL4101T main features and advantages:
Integrated PFC and flyback controller.
True universal mains supply operation: 70 V (AC) to 305 V (AC).
High level of integration, resulting in a very low external component count and a cost-effective design.
On-chip start-up current source.
PFC green features
Valley/zero voltage switching for minimum switching losses (NXP Semiconductors patented).
Frequency limitation to reduce switching losses.
PFC is switched off when a low load is detected at the flyback output. Flyback green features
Valley switching for minimum switching losses (NXP Semiconductors patented).
Frequency reduction with fixed minimum peak current at low power operation to maintain high efficiency at low output power levels.
Safe restart mode for system fault conditions.
Continuous mode protection by means of 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).
Open control loop protection for both converters. The open loop protection on the flyback converter is safe restart.
IC OverTemperature Protection (OTP).
Low and adjustable OverCurrent Protection (OCP) trip level for both converters.
General purpose input for latched protection, eg to be used for system OverTemperature Protection (OTP).
The device can be used in all LED lighting applications that require a very efficient, low THD, high PF, true universal input voltage and cost-effective power supply solution between 10 W and 300 W.
Figure 1. SSL4101T block diagram
Figure 2. SSL4101T application configuration diagram
Figure 3. Typical application circuit diagram of SSL4101T
SSL4101DB02 Quad High Efficiency Universal FireWire Input Voltage Constant Current LED Driver Demonstration Board
The SSL4101DB02 4-channel demo board demonstrates the LED driving capabilities of the SSL4101 and UBA3070 devices.
Each channel is individually dimmable using Pulse Width Modulation (PWM) or an analog signal. The circuit implements a universal mains low THD PFC, a highly efficient flyback controller and four Boundary Conduction Mode (BCM) buck converters. The BCM buck converter is a true switch-mode current source. The overall efficiency for the unit from AC input to 4-channel DC output is 92 %. The complete solution meets all safety and EMI regulations.
The main features of the four-way LED driver demo board:
• Up to 92 % efficiency
• Low THDI and high PF
• User configured output current requiring no custom-made magnetic components
• Intrinsically protected against short-circuit, open-load and overtemperature conditions
• BCM buck converters operate as true switch-mode current sources
• Low-cost LED driver solutions
• Small form factor
• PWM or analog dimming
• Independent or combined control of channels
• No LED binning required
Quad LED Driver Demonstration Board Applications:
Typical target applications for the 4-channel demo board include:
• Street lighting
• High and low bay lighting
• Refrigeration lighting
Figure 4. Four-channel LED driver demo board outline drawing
The main indicators of the four-way LED driver demo board:
For details, see:
The Links: PM450CG1C065 MCC161-22IO1