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Design Guide, Version 1.1, 8 August 2011

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t h i n k i n g .

P o w e r M a n a g e m e n t & S u p p l y

I C E 2 Q R x x 6 5 / 8 0 x

Q u a s i R e s o n a n c e C o o l S E T D e s i g n G u i d e

AN-PS0053

Содержание CoolSET ICE2QR 65 Series

Страница 1: ...Design Guide Version 1 1 8 August 2011 N e v e r s t o p t h i n k i n g Power Management Supply ICE2QRxx65 80x Q u a s i R e s o n a n c e C o o l S E T D e s i g n G u i d e AN PS0053 ...

Страница 2: ... and conditions and prices please contact the nearest Infineon Technologies Office www infineon com Warnings Due to technical requirements components may contain dangerous substances For information on the types in question please contact the nearest Infineon Technologies Office Infineon Technologies components may be used in life support devices or systems only with the express written approval o...

Страница 3: ... typo ICE2QRxx65 80x Quasi Resonance CoolSET Design Guide License to Infineon Technologies Asia Pacific Pte Ltd AN PS0053 Winson Wong Winson wong infineon com Eric Kok Eric kok infineon com We Listen to Your Comments Any information within this document that you feel is wrong unclear or missing at all Your feedback will help us to continuously improve the quality of this document Please send your ...

Страница 4: ...C Pre Charging and Typical VCC Voltage During Start up 8 4 1 1 VCC Capacitor 9 4 2 Soft Start 9 4 3 Normal Operation 10 4 3 1 Switch on Determination 10 4 3 2 Switch off Determination 11 4 4 Active Burst Mode Operation 11 4 4 1 Entering Active Burst Mode Operation 11 4 4 2 During Burst Mode Operation 12 4 4 3 Leaving Active Burst Mode 13 4 5 Current sense 13 4 6 Feedback 13 4 7 Zero crossing 13 4 ...

Страница 5: ...de operation and low output voltage ripple The numerous protection functions give a full protection of the power supply system in failure situation All of these make the ICE2QRxx65 80x an outstanding power CoolSET for quasi resonant flyback converter in the market In addition numerous protection functions have been implemented in the CoolSET to protect the system and customize the CoolSET for the ...

Страница 6: ... Drain This pin is connected to the drain of the 650V 800V CoolMOS 2 3 5 VCC Power supply The VCC pin is the positive supply of the CoolSET and should be connected to auxiliary winding of the main transformer 2 3 6 GND Ground This is the common ground of the CoolSET Note that the current sense resistor ground should be connected to bulk capacitor ground in order to avoid strong noise interruption ...

Страница 7: ...ng respectively After the oscillation 1 is damped the drain source voltage of the power switch shows a constant value of Vbus VRefl until the transformer is fully demagnetized This duration builds up the first portion of the off time toff1 After the secondary side current falls to zero the drains source voltage of the power switch shows another oscillation oscillation 2 in Figure 3 this is also me...

Страница 8: ...oltage device provides a current to charge the VCC capacitor Cvcc Before the VCC voltage reaches a certain value the amplitude of the current through the high voltage device is only determined by its channel resistance and can be as high as several mA After the VCC voltage rises to certain level the CoolSET controls the startup cell so that a constant current around 1mA is provided to charge the V...

Страница 9: ... there is a VCC undervoltage protection the capacitance of the VCC capacitor should be selected to be high enough to ensure that enough energy is stored in the VCC capacitor so that the VCC voltage will never touch the VCC under voltage protection threshold VVCCUVP before the output voltage is built up Therefore the capacitance should fulfill the following requirement VCCUVP VCCon 1 2 VCCop VCC V ...

Страница 10: ... The up down counter stores the number of zero crossing to be detected to switch on the main power switch after demagnetisation of the transformer This value is a function of the feedback voltage VFB which contains information about the output power Generally a high output power results in a high feedback voltage VFB According to this information the value in the up down counter is changed to a lo...

Страница 11: ...mode operation the digital comparator is disabled and no pulse will be generated 4 3 2 Switch off Determination In the converter system the primary current is sensed by an external shunt resistor which is connected between Current Sense pin and the common ground The sensed voltage across the shunt resistor VCS is applied to an internal current measurement unit and its output voltage V1 is compared...

Страница 12: ...mode operation only when the output power is really low during the preset blanking time 4 4 2 During Burst Mode Operation After entering the Active Burst Mode the feedback voltage rises as VO starts to decrease due to the inactive PWM section One comparator observes the feedback signal if the voltage level VBH 3 6V is exceeded In that case the internal circuit is again activated by the internal bi...

Страница 13: ... voltage VCS_PK is 1V Therefore the current sense resistor can be chosen according to the maximum required peak current in the transformer as shown in 9 p pk CS I R _ 1 9 The design procedure of quasi resonant flyback transformer is shown in 2 In addition a leading edge blanking LEB is already built inside the current sense pin The typical value of leading edge blanking time is 330ns which can be ...

Страница 14: ...herefore the current flowing out from ZC pin at this moment is P ZC a BUS ON ZC N R N V I 1 _ 12 The threshold in ZC pin to start the foldback point correction is IZC 0 5 mA Therefore RZC1 can be chosen so that P a S BUS ZC N mA N V R 5 0 _ 1 13 In 13 VBUS_S is the voltage from which the maximum output power is desired to be maintained at constant level The corresponding maximum current sense volt...

Страница 15: ...ge is higher than the preset threshold VZCOVP the CoolSET is latched off after the preset blanking time If the junction temperature of CoolSET exceeds 140o C the CoolSET enters into auto restart mode If the voltage at the current sensing pin is higher than the preset threshold VCSSW during on time of the power switch the CoolSET is latched off This is short winding protection During latch off prot...

Страница 16: ...ifier loss and the MOSFET power loss are considered The only information needed is the required output power the input voltage range the operating ambient temperature and the efficiency of the system The required input power can then be calculated as equation 14 o in P P 14 where Pin input power Po output power η efficiency It then simply looks up the closed input power at the required ambient tem...

Страница 17: ...QR1765 Vin 85Vac 265Vac ICE2QR1765 Vin 230Vac 15 Figure 11 Input power curve for ICE2QR1765 ICE2QR4765 Vin 85Vac 265Vac ICE2QR4765 Vin 230Vac 15 Figure 12 Input power curve for ICE2QR4765 ICE2QR0665Z Vin 85Vac 265Vac ICE2QR0665Z Vin 230Vac 15 Figure 13 Input power curve for ICE2QR0665Z ...

Страница 18: ...1065Z Vin 85Vac 265Vac ICE2QR1065Z Vin 230Vac 15 Figure 14 Input power curve for ICE2QR1065Z ICE2QR1765Z Vin 85Vac 265Vac ICE2QR175Z Vin 230Vac 15 Figure 15 Input power curve for ICE2QR1765Z ICE2QR4765Z Vin 85Vac 265Vac ICE2QR4765Z Vin 230Vac 15 Figure 16 Input power curve for ICE2QR4765Z ...

Страница 19: ...665G Vin 85Vac 265Vac ICE2QR0665G Vin 230Vac 15 Figure 17 Input power curve for ICE2QR0665G ICE2QR1765G Vin 85Vac 265Vac ICE2QR1765G Vin 230Vac 15 Figure 18 Input power curve for ICE2QR1765G ICE2QR4765G Vin 85Vac 265Vac ICE2QR4765G Vin 230Vac 15 Figure 19 Input power curve for ICE2QR4765G ...

Страница 20: ...680Z Vin 85Vac 265Vac ICE2QR0680Z Vin 230Vac 15 Figure 20 Input power curve for ICE2QR0680Z ICE2QR2280Z Vin 85Vac 265Vac ICE2QR2280Z Vin 230Vac 15 Figure 21 Input power curve for ICE2QR2280Z ICE2QR4780Z Vin 85Vac 265Vac ICE2QR4780Z Vin 230Vac 15 Figure 22 Input power curve for ICE2QR4780Z ...

Страница 21: ...W for 650V DIP 7 CoolSET there is no copper area as heatsink and the Rthja 96K W for 650V DSO 12 CoolSET there is no copper area as heatsink and the Rthja 110K W for 800V DIP 7 CoolSET there is 232mm2 copper area of 2oz PCB at drain pin for heatsink and the Rthja 80K W and for 800V DSO12 CoolSET there is 232mm2 copper area of 2oz PCB at drain pin for heatsink and the Rthja 85K W 4 Saturation curre...

Страница 22: ...filter return ground Y capacitor C15 auxiliary winding ground of transformer and the RCS resistor The high voltage pins are connected to bus voltage in typical applications During lightning surge test the noise on bus voltage is high It is suggested that the track to high voltage pin shall be kept away from other small signal tracks The distance is better to be more than 3mm 8 Product Portfolio Qu...

Страница 23: ...N p s Auxiliary turns s diode out diode cc aux N V V V V N ICE2QRxx65 80x external component design Current sense resistor P pk CSth CS I V R _ VCC capacitor VCCon e VCCch startup VCC V I t C 2 arg tstartup startup time of system suggested CVCC is 22μF ZC resistors p aux S BUS ZC N mA N V R 5 0 _ 1 1 _ 1 2 ZCOVP diode OVP out s aux ZC ZC V V V N N R R Vout_OVP output OVP voltage VBUS_S bulk capaci...

Страница 24: ...8 Infineon Technologies 12 Datasheet ICE2QR0680Z Off Line SMPS Quasi Resonant PWM Controller with integrated 800V Startup Cell Depletion CoolMOS In DIP7 Infineon Technologies 13 Datasheet ICE2QR2280Z Off Line SMPS Quasi Resonant PWM Controller with integrated 800V Startup Cell Depletion CoolMOS In DIP7 Infineon Technologies 14 Datasheet ICE2QR4780Z Off Line SMPS Quasi Resonant PWM Controller with ...

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