Atmel AT89RFD-10/EVLB002 User Manual Download Page 6

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Ballast Demonstrator User Guide

-3

7629A–AVR–04/06

Figure 1-2.

Ballast demonstrator assembled board

Figure 1-3.

Non-Dimmable Ballast block diagram

UVLO

15V

3.3V

Regulator

PFC Driver

IX859

PFC BOOST REGULATOR

Driver

15V

INVERTER

DECOUPLING CAP

CIT

RESONATING

INDUCTOR

AND

FILAMENT

TRANSFORMER

IXD611

R28

IXTP3N50P

ULK CAP

CIT

C14

R13

R35

IXTP02N50D

R10

R14

R39

C11

RESONA

TING CAP

CIT

BALANCE

TRANSFORMER

AND

LAMPS

POWER

VOLTAGE

R42

PFC Output

Inverter High

Inverter Low

V_HAVERSINE

V_BUS

V_LAMP

I_LAMP

P3.5/W0M1

P3.5W1M0

P3.6/W1M1

P4.0/AIN0

P3.3/AIN4

P4.1/AIN1

P4.3/AIN3

PFC_ZCD

P3.2/INT0

AT89EB5114

PFC Inductor

Summary of Contents for AT89RFD-10/EVLB002

Page 1: ...AT89RFD 10 EVLB002 Non Dimmable Fluorescent Ballast User Guide IXDN0037...

Page 2: ...3 8 3 1 4 PFC Magnetics 3 8 3 1 5 Lamp Drive 3 8 3 1 6 Control 3 8 3 1 7 IXYS IXI859 Charge Pump Regulator 3 9 3 1 8 IXYS IXTP02N50D Depletion Mode MOSFET used 3 9 3 1 9 IXYS IXD611 Half bridge MOSFET...

Page 3: ...Ballast Demonstrator User Guide 7629A AVR 04 06 6 1 Appendix 1 Capacitor Coupled Low Voltage Supply 6 23 6 2 Appendix 2 PFC Basics 6 24 6 3 Appendix 3 Bill of Materials 6 25 6 4 Appendix 4 Schematic 6...

Page 4: ...start fluorescent lamps have two pins at each end with a filament across the pins The lamp has argon gas under low pressure and a small amount of mercury in the phosphor coated glass tube As an AC vo...

Page 5: ...utility is achieved by designing a microcontroller for the electronic ballast application that can precisely and efficiently control power levels in the fluorescent lamp An application specific microc...

Page 6: ...R RESONATING INDUCTOR AND FILAMENT TRANSFORMER 2 11 3 10 5 8 6 7 T4 IXD611 R28 IXTP3N50P Q5 Q4 BULK CAPACITOR C9 C14 D4 Q3 R2 Q1 D2 D3 R9 R13 R35 T1 IXTP02N50D R10 R14 R39 11 2 10 3 5 6 7 C11 RESONATI...

Page 7: ...bridge driver A D with programmable gain used for efficient current sensing SOIC 20 pin package 2 2 IXYS Supported Products IXI859 Charge pump with voltage regulator and MOSFET driver 3 3V regulator w...

Page 8: ...tage Supply 3 3V microcontroller power and 15V FET drive power are provided by the low voltage supply consisting of a current source Q1 and multipurpose IC U1 IXI589 Internal to U1 are a 3 3V linear r...

Page 9: ...out of phase A deadband time between HBRIDGE HI and HBRIDGE LO pulses insures that both drivers are never on at the same time The lamp drive is constant in duty cycle The power to the lamps is control...

Page 10: ...mbination must be sized carefully so that the voltage present at the Vcc pin does not collapse too quickly under load and causes the UVLO circuitry to disable device opera tion before the microcontrol...

Page 11: ...ortant to note that pulse overlap which could lead to the destruction of the two MOSFETs due to current shoot through is pre vented via the input drive signals through the microcontroller This paramet...

Page 12: ...ssing event starts the PFC control loop Checks are made for the presence of the rectified mains haversine and bus voltage throughout normal operation Mains sense P3 3 AIN4 0 76 V pk 90 VAC or 2 24 V p...

Page 13: ...0 76 Vmin 90VAC 2 24 265VAC Vmax haversine peak for the PFC to start 7 Check AC line condition every 200 mS maximum 10 cycles of 50 Hz 8 If fail check halt PFC and Half Bridge Do not restart until li...

Page 14: ...he single lamp condition occurs during run as noted by a decrease in current of more than 20 from the preset level increase the frequency until the single lamp power conditions are met If the current...

Page 15: ...ver current Start re ignition sequence Repeat 6 times and if still out of spec shutdown PFC and half bridge drive PD6 rectified AC drive Checks are made for the presence of the rectified mains haversi...

Page 16: ...ballast to operate there are two primary control systems that run simul taneously The first is for the PFC control and second for the Lamp control Furthermore in order to work properly the state mach...

Page 17: ...Main AT8xEB5114 FLUO DEMO V_HAVERSINE TEMPERATURE I_LAMP V_LAMP V_BUS PFC_ZCD LAMP_EOL Analog comparator ADC PFC_OUTPUT INVERTER_HIGH INVERTER_LOW DUAL_LAMP PFC CTRL LAMP CTRL gv_v_haversine gv_v_bus...

Page 18: ...previously off this is the first conversion and is not necessarily valid Start the first V_HAVERSINE_CONV conversion V_HAVERSINE_CONV Get back the v_haversine result Start the V_BUS_CONV next conversi...

Page 19: ...18 Ballast Demonstrator User Guide 7629A AVR 04 06 Start the I_LAMP_CONV conversion I_LAMP_CONV Get back the i_lamp result Start the next conversion cycle with a V_HAVERSINE_CONV conversion...

Page 20: ...E_CHECK PFC haversine peak must be included between HAVERSINE_PEAK_MIN and HAVERSINE_PEAK_MAX 90VAC and 265VAC If the haversine value is OK set the maximum pulse width allowed and jump to the CONFIGUR...

Page 21: ...RT_CONFIGURATION If a zero crossing detection appears jump to the PFC_CONTROL_LOOP state Else go to INIT_PFC_HAVERSINE_CHECK PFC_DELAY_FOR_NEXT_PFC_SOFT_START or PFC_PROBLEM state depending on the dif...

Page 22: ...nt then configure the PSC2 according to the definitions in the config h file and initialize all the lamp control variables Then jump to the LAMP_PREHEAT state LAMP_PREHEAT Let the preheat sequence for...

Page 23: ...then checking for ignition by measur ing lamp current and voltage In case it is START_RUN_MODE In case it isn t RESTART_PREHEAT RESTART_PREHEAT Reconfigure the Inverter with the Restart parameters th...

Page 24: ...ontroller offers the lamp manufacturer the flexibility to add or modify design features to enhance their market position The ballast demonstrator with its many features does not address all the possib...

Page 25: ...pe with a voltage rating to withstand the peak line voltage including transients A high quality film capacitor is recommended 6 2 Appendix 2 PFC Basics The function of the PFC boost regulator is to pr...

Page 26: ...ycle is proportional to the line voltage which is nearly constant during Ton Ipeak Vin x Ton L Since the aver age value of a triangular waveform is half its peak value the average current drawn is als...

Page 27: ...4ZA01D C30 13 2 C16 C17 4 7 nF 630V ECJ 3FB2J472K 14 4 C18 C19 C21 C22 220 nF 100V ECJ 4YB2A224K 15 1 C20 001 uF GRM2165C1H102JA01D 16 2 C25 C26 100 pF ECJ 2VC1H101J 17 1 C29 560 pF 5 ECJ 2VC1H561J 18...

Page 28: ...7K 5 50 1 R37 12K 5 51 2 R39 R40 100 OHM 5 52 1 TP1 15V 5001 53 3 TP2 TP3 TP8 GND 5001 54 1 TP4 GATEDR 5001 55 1 TP5 GATEHI 5001 56 1 TP6 GATELO 5001 57 1 TP7 VCC 5001 58 1 T1 LPFC PA1438 59 1 T3 BAL...

Page 29: ...13 LL4 14 8 13 R24 1K H BRID GE_L O H BR ID GE_H I D 7 LL4 14 8 13 C 4 1 uF 600V 11 0 2 20 VIN Q 4 IXTP3N 50P 40 0V BUS T ES T RE SON ANT CAP LAM P VO LT DET EN D OF L IF E DC A C DAC C ONTR OLL ED WI...

Page 30: ...1901 x26 FAX 970 493 1903 www ixysrf com MicroWave Technology Inc 4268 Solar Way Fremont CA 94538 510 651 6700 FAX 510 651 2208 www mwtinc com Westcode Semiconductors Ltd Langley ParkWay Langley Park...

Page 31: ...2325 Orchard Parkway San Jose CA 95131 USA Tel 1 408 441 0311 Fax 1 408 487 2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH 1705 Fribourg Switzerland Tel 41 26 42...

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