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PDF ICL8002G Data sheet ( Hoja de datos )

Número de pieza ICL8002G
Descripción Single Stage PFC and Flyback LED Controller
Fabricantes Infineon Technologies 
Logotipo Infineon Technologies Logotipo



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No Preview Available ! ICL8002G Hoja de datos, Descripción, Manual

LED Controller IC
Single Stage PFC and Flyback LED Controller
ICL8002G
Data Sheet
Rev1.0, 2012-02-28
Industrial and Multimarket

1 page




ICL8002G pdf
Single Stage PFC and Flyback LED Controller
ICL8002G
Single Stage PFC and Flyback LED Controller Product Highlight
1 Single Stage PFC and Flyback LED Controller
Product Highlight
• Quasi-Resonant Control For Highly Efficient LED Driving Solutions
• Primary Side Flyback Control With Integrated PFC And Phase-Cut Dimming
• Integrated HV Startup Cell For Short Time To Light
• Best In Class System BOM For Dimmable LED Bulb
• Continous Dimming curve for better diiming behaviour
Features
• High, stable efficiency over wide operating range
• Optimized for trailing- and leading-edge dimmer
• Precise PWM for primary PFC and dimming control
• Power cell for Vcc pre-charging with constant current
• Built-in digital soft-start
• Foldback correction and cycle-by-cycle peak current limitation
• VCC over/ under-voltage lockout
• Auto restart mode for short circuit protection
• Adjustable latch-off mode for output overvoltage protection
• Minimize the light shimmering effect for better dimming behaviour.
• Enabling the input current shaping for higher PF and lower THD.
Description
The ICL8002G employs quasi-resonant operation mode optimized for off-line LED lighting, especially dimmable
LED bulbs for incandescent lamp replacement.
Precise PWM generation enables primary control for phase cut dimming and high power factor PF>98%.
Significant improved driver efficiency, up to 90%, compared to other conventional solutions. Tthe product has a
wide operation range (up to 26 V) of IC voltage supply and lower power consumption. Multiple safety functions
ensure a full system protection in failure situations.
With its full feature set and simple application, the ICL8002G represents an outstanding choice for quasi-resonant
flyback LED bulb designs combining feature set and performance at minimum BOM cost.
Data Sheet
7 Rev1.0, 2012-02-28

5 Page





ICL8002G arduino
Single Stage PFC and Flyback LED Controller
ICL8002G
Functional Description
4.2 Soft-start
At the time ton, the IC begins to operate with a soft-start. By this soft-start the switching stresses for the switch,
diode and transformer are minimised. The soft-start implemented in ICL8002G is a digital time-based function. The
preset soft-start time is 12ms with 4 steps. If not limited by other functions, the peak voltage on CS pin will increase
step by step from 0.32 V to 1 V finally.
Vcs_sst
(V)
1. 00
0. 83
0. 66
0. 49
0. 32
ton 3 6 9 12 Time(ms)
Figure 5 Maximum current sense voltage during softstart
4.3 Normal Operation
The PWM controller during normal operation consists of a digital signal processing circuit including a comparator,
and an analog circuit including a current measurement unit and a comparator. The switch-on and -off time points
are each determined by the digital circuit and the analog circuit, respectively. As input information for the switch-
on determination, the zero-crossing input signal is needed, while the voltages sense signal at pin VR and the
current sensing signal VCS are necessary for the switch-off determination. Details about the full operation of the
PWM controller in normal operation are illustrated in the following paragraphs.
4.3.1 Zero Crossing
In the system, the voltage from the auxiliary winding is applied to the zero-crossing pin through a RC network,
which provides a time delay to the voltage from the auxiliary winding. Internally, this pin is connected to a clamping
network, a zero-crossing detector, an output overvoltage detector and a ringing suppression time controller.
During on-state of the power switch a negative voltage applies to the ZCV pin. Through the internal clamping
network, the voltage at the pin is clamped to -0.3V.
The voltage VZC is also used for the output overvoltage protection. Once the voltage at this pin is higher than the
threshold VZCOVP during off-time of the main switch, the IC is latched off after a fixed blanking time.
To achieve the switch-on at voltage valley, the voltage from the auxiliary winding is fed to a time delay network
(the RC network consists of Dzc, Rzc1, Rzc2 and Czc as shown in typical application circuit) before it is applied
to the zero-crossing detector through the ZC pin. The needed time delay to the main oscillation signal Dt should
be approximately one fourth of the oscillation period (by transformer primary inductor and drain-source capacitor)
Data Sheet
13 Rev1.0, 2012-02-28

11 Page







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