Single-Stage Dimmable LED Drivers
1.0 Features
●Isolated/non-isolated off-line 120V AC/230V AC LED driver
液化气燃烧器up to 20W output power ●Wide line frequency range (from 45Hz to 66Hz)
●Meets IEC61000-3-2 current harmonic requirement
●Total harmonic distortion < 20% with PF > 0.92
●Excellent dimmer compatibility
x Leading-edge dimmer
x Trailing-edge dimmer
x Digital smart dimmer数据的
波动
●Wide dimming range of 1% to 100%
●Intelligent digital control integrating current sink function
into power switching circuit
●Advanced IC power management and voltage sensing
enables the use of off-the-shelf inductor
●Resonant control to achieve high efficiency (typical > 85%
without dimmer)
●Excellent AC line distortion immunity ensures quality of
隐私保护通话>水的声阻抗product under real-life circumstances ●Over-temperature LED current foldback and shutdown ●Tight LED current regulation (±5%)
●Fast start-up (< 0.5s without dimmer)
●Multiple protection features that include:
x LED open-circuit and short-circuit protection
x Current sensing resistor open circuit and short-circuit protection
x AC line over-voltage protection
x Over-current protection 2.0 Description
The iW3688 is a single-stage, high-performance AC/DC off-line power supply controller for dimmable LED luminaires. It applies advanced digital control technology to detect the dimmer type, enabling it to provide dynamic impedance to interface with the dimmer and to control the LED brightness at the same time. With advanced dimmer detection technology, the iW3688 can operate with most wall dimmers including leading- edge dimmers (R-type or R-L type), trailing-edge dimmers (R-C type), and smart dimmers. In addition, the iW3688’s cycle-by-cycle waveform analysis technology allows for fast dimmer transient response.
In no-dimmer mode, the iW3688 operates the main power converter that delivers current to the LED load in quasi- resonant mode to provide high power efficiency and low electro-magnetic interference
(EMI). When there is no dimmer on the line, the iW3688 optimizes the power factor and minimizes the current harmonic distortion to the AC line. The commonly utilized converter topologies for iW3688 are buck-boost and flyback.
The iW3688 uses patented PrimAccurate™ primary-side sensing technology to achieve excellent LED current regulation under different AC line and LED load voltages, without using a secondary-side feedback circuit and thus eliminating the need for an opto-coupler.
The iW3688 minimizes the external components count by simplifying the EMI filter with Dialog’s EZ-EMI® technology, and by integrating current sink, switching, and V CC charging circuit. Additionally, the iW3688 does not require an auxiliary winding, which eliminates the need for a custom inductor. The digital control loop of the iW3688 maintains stability over all operating conditions without the need for loop compensation components.
The iW3688 maintains high performance wide-range dimming and achieves excellent dimmer compatibility with a simple application circuit.
3.0 Applications
●Dimmable LED retrofit lamps up to 20W
●
Dimmable LED luminaires up to 20W
Single-Stage Dimmable LED Drivers
L
Figure 3.1: iW3688 Simplified Application Circuit
Single-Stage Dimmable LED Drivers
4.0 Pinout Description
Figure 4.1: 14-Lead SOIC-14 Package
Single-Stage Dimmable LED Drivers
5.0 Absolute Maximum Ratings
连续供墨Absolute maximum ratings are the parameter values or ranges which can cause permanent damage if exceeded. For maximum safe operating conditions, refer to Section 6.0 Electrical Characteristics.
Single-Stage Dimmable LED Drivers
6.0 Electrical Characteristics
V CC = 5V, -40°C ≤ T A ≤ 85°C, unless otherwise specified (Note 1)
豫公网安备41160202000603
站长QQ:729038198
关于我们
投诉建议