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Related Manuals for Infineon ICL8001G
Summary of Contents for Infineon ICL8001G
- Page 1 LED D ri v er IC s ICL 8001 G / I CLS 808 2G Des i g n G ui de l i nes Phase-Cut-Dimmable Single-Stage LED Driver with PFC using Quasi-Resonant Primary Power Control Version 2.0 App l i c ati on No te Version 2.0, 2011-04-14 Indus t ri al &...
- Page 2 Infineon Technologies components may be used in life-support devices or systems only with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body or to support and/or maintain and sustain and/or protect human life.
- Page 3 ICL8001G / ICLS8082G Design Guidelines ICL8001G / ICLS8082G Design Guidelines werner.ludorf@infineon.com Revision History: 2011-04-14, Version 2.0 Previous Revision: Page Subjects (major changes since last revision) First edition Application Note Version 2.0, 2011-04-14...
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Page 4: Table Of Contents
Discrete Power Stabilization Circuit for ICL8001G ........ -
Page 5: Introduction
IC voltage supply and low power consumption. Multiple safety functions ensure full system protection in failure situations. With its full feature set and simple application, the ICL8001G / ICLS8082G represents an outstanding choice for QR flyback designs combining feature set and performance at a minimum BOM cost. -
Page 6: Pin Configuration And Functionality
ICL8001G / ICLS8082G Design Guidelines Pin Configuration and Functionality Application circuit Figure 1 below shows the application circuit for the ICL8001G. Rzc1 Dvcc Rvcc Cvcc Rzc2 Start-Up ICL8001G Cell PWM-Control Vm( Vs ) Protection Gate Driver Figure 1 ICL8001G application circuit... -
Page 7: Package Pg-Dso-8
ICL8001G / ICLS8082G Design Guidelines Pin Configuration and Functionality Package PG-DSO-8 Figure 2 Pin Configuration of PG-DSO-8 (top view) Pin Functionality ZCV (Zero Crossing) The voltage from the auxiliary winding after a time delay circuit is applied at this pin. Internally, the pin is connected to the zero-crossing detector for switch-on determination. -
Page 8: Control Principle
Blanking Figure 3 Block diagram of the ICL8001G An inspection of the ICL8001G block diagram shows that the voltage measured at the shunt resistor Rs (see also the application circuit in Figure 1), which varies according to the instant transformer primary current Ip(t), determines the gain voltage VG as ... -
Page 9: Design Parameters
ICL8001G / ICLS8082G Design Guidelines Design Parameters It can be seen in the non-dimming case that a sinusoidal waveform of the primary peak current is dominant, which defines the almost sinusoidal shape of the input current Iin(t). Beside the PFC function... -
Page 10: Power Switch
ICL8001G / ICLS8082G Design Guidelines Design Parameters Now the maximum primary peak current arising in the line phase with Vin = Vinp can be fixed as = 0.27 A pmaxp according to Assuming a saturation inductance of Bm = 0.4 T and Ae = 20.1 mm a minimum number of primary turns of np ≈... -
Page 11: Primary Peak Current Control
ICL8001G / ICLS8082G Design Guidelines Design Parameters cost and efficiency reduction with the option of choosing MOSFETs with higher breakdown voltages. For high efficiency it is recommended to make the adjustment V = 2 Vinp + Vosc < 800 V or 900 V respectively. If DSmax necessary, a transformer design with q <... -
Page 12: Foldback Correction
ICL8001G / ICLS8082G Design Guidelines Design Parameters Foldback Correction When the line input voltage increases, the comparator threshold for switching off the power switch is reached in a shorter time and the resulting increase in operation frequency would lead to a strong increase in the LED driver power. -
Page 13: Switch-On Determination For Quasi-Resonant Operation
ICL8001G / ICLS8082G Design Guidelines Design Parameters Switch-on Determination for Quasi-resonant Operation For ideal quasi-resonant operation the switch-on of the power switch should occur when the transformer current in the output circuit reaches zero and half of the oscillation period (oscillation 2 in... -
Page 14: Power Factor Correction
ICL8001G / ICLS8082G Design Guidelines Design Parameters Power Factor Correction The PFC function provides a sinusoidal input current waveform. For this, the setpoint at pin VR should be related strongly to the input voltage waveform Vin(t). The internal reference voltage Vref is connected via the internal resistor VFB to the pin VR. -
Page 15: Design Optimizations
ICL8001G / ICLS8082G Design Guidelines Design Optimizations Design Optimizations Dimming 5.1.1 Dimming Principle The LED driver input voltage at phase cut dimming with the switching instant ts will generate an effective voltage of Vineff(ts). From the applied dimming principle it can be seen that the LED power will depend on Vineff(ts) according to the proportionality law ... - Page 16 ICL8001G / ICLS8082G Design Guidelines Design Optimizations Phase cut dimming arrangement Phase Cut Dimmer ICL8001G LED Array VLED LED Driver Figure 9 Phase cut dimming arrangement The experimental dependence PLED(Vrms) is illustrated using a 40 Weq LED bulb driver controlled with a trailing edge phase cut dimmer.
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Page 17: Dimmer Compatibility
ICL8001G / ICLS8082G Design Guidelines Design Optimizations The lower curve corresponds closely to the lumen flux of the LED array supplied by the driver and illustrates a continuous increase for the switching angle variation at the wall dimmer. 5.1.2 Dimmer Compatibility The driver operation with TRIAC dimmers makes it necessary to observe the requirements regarding their hold- up currents. -
Page 18: Dimmer List
ICL8001G / ICLS8082G Design Guidelines Design Optimizations Figure 13 Input current waveforms For an input supply voltage of 100 V the resistors have been changed accordingly: R19 from 3.9 kΩ to 10 kΩ, R19 from 150 kΩ to 300 kΩ and R4 from 2.2 Ω to 2.7 Ω. The increased dimmer compatibility decreases the power factor from 99 % to 86 %. -
Page 19: Dimmer Selection
5.1.4 Dimmer Selection With ICL8001G / ICLS8082G control the LED driver can be operated without a wall dimmer as well as using trailing- and leading-edge dimmers. With the phase-cut dimmers applied above, a satisfying light quality and variation in the LED lumen flux over the dimming range has been achieved. For both technologies the phase-cut range should be sufficiently large to provide the dimming range required. -
Page 20: Discrete Power Stabilization Circuit For Icl8001G
The LED driver should be designed for operation at the maximum voltage arising in the input voltage range. 5.2.2 Discrete Power Stabilization Circuit for ICL8001G For especially high requirements regarding input power or LED current stability for line voltage variations, such as ∆ILED ≤... - Page 21 ∆ILED ≤ + 0.3 % and ∆ILED ≤ –1.3 % at ∆Vac = +10 % and ∆Vac = –10 % respectively. There is no influence on output short circuit and output open loop detection. BOM of Discrete Power Stabilization Circuit for 230V / 10W ICL8001G LED Driver Demoboard Component Value...
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Page 22: Optimized Power Factor Correction Performance
ICL8001G / ICLS8082G Design Guidelines Design Optimizations Optimized Power Factor Correction Performance Driver optimization for high power factor correction can deliver very high PF > 99 % and THD ≈ 10 %. Corresponding measurements for a 100 V / 10 W LED driver result in the timing diagrams for the setpoint voltage VR(t) and driver input current Iin(t). -
Page 23: Protection Functions
ICL8001G / ICLS8082G Design Guidelines Protection Functions Protection Functions The following ICL8001G / ICLS8082G protection functions are provided. Table 5 ICL8001G / ICLS8082G protection functions VCC Overvoltage Auto Restart Mode VCC Undervoltage Auto Restart Mode Output Overvoltage Latched Off Mode... -
Page 24: Explicit Questions And Answers
What will happen under no-load conditions? The application circuits based on ICL8001G / ICLS8082G are designed to work with LEDs only. Under no-load conditions it will go to either the auto restart mode due to Vcc OVP or latched off mode due to output OVP. -
Page 25: References
R4, the voltage dividers formed by R17 and R19 as well as R6 & R3 have also to be considered. The ICL8001G / ICLS8082G PWM parameter GPWM and offset voltage needed for low driver tolerances possess especially high precision, as stated in the ICL8001G / ICLS8082G data sheet. - Page 26 . i n f i n e o n . c o m Published by Infineon Technologies AG...