FAN7710 Ballast Control IC for Compact Fluorescent Lampsdocs- ??FAN7710 — Ballast Control IC for Compact Fluorescent Lamps ... FAN7710 Ballast Control IC for Compact ... The ballast circuit for a fluorescent lamp is

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  • 2

    FAN

    7710 B

    allast Control IC

    for Com

    pact Fluorescent Lamps

    June 2007

    FAN

    FAN7710Ballast Control IC for Compact Fluorescent LampsFeatures

    Integrated Half-Bridge MOSFET

    Floating Channel for Bootstrap Operation up to +550V

    Low Start-up and Operating Current: 120A, 2.6mA

    Under-Voltage Lockout with 1.8V of Hysteresis

    Adjustable Run Frequency and Preheat Time

    Internal Active ZVS Control

    Internal Protection Function (No Lamp)

    Internal Clamping Zener Diode

    High Accuracy Oscillator

    Soft-Start Functionality

    ApplicationsCompact Fluorescent Lamp Ballast

    Description The FAN7710, developed using Fairchilds unique high-voltage process and system-in-package (SiP) concept, isa ballast control integrated circuit (IC) for a compactfluorescent lamp (CFL). The FAN7710 controls internalhigh-voltage stress and delivers 20W to the lamp at310VDC voltage. FAN7710 incorporates a preheating /ignition function, controlled by an user-selected externalcapacitor, to increase lamp life. The FAN7710 detectsswitch operation from after ignition-mode through aninternal active Zero-Voltage Switching (ZVS) controlcircuit. This control scheme enables the FAN7710 todetect an open-lamp condition, without the expense ofexternal circuitry, and prevents stress on MOSFETs. Thehigh-side driver built into the FAN7710 has a common-mode noise cancellation circuit that provides robustoperation against high-dv/dt noise intrusion.

    Ordering Information

    8-DIP

    Part Number Package Pb-Free Operating Temperature Range Packing MethodFAN7710N 8-DIP Yes -25C ~ 125C Tube

    007 Fairchild Semiconductor Corporation www.fairchildsemi.com7710 Rev. 1.0.2

  • FAN

    7710 B

    allast Control IC

    for Com

    pact Fluorescent Lamps

    2FAN

    Typical Application Diagrams

    Figure 1. Typical Application Circuit for Compact Fluorescent Lamp

    Internal Block Diagram

    Figure 2. Functional Block Diagram

    * Refer to the BOM and design guide provided on page16.

    3V 5V

    CPH

    IPHIPH

    *

    IRT

    IPH=0.6*IRT

    0A

    4V

    IPH*

    OSCILLATOR

    CPH

    DEAD TIMEControl

    5V/3V

    S

    R

    Q

    QSDL SDH RESET

    SYSHALT

    ADAPTIVE ZVS ENABLE LOGIC

    SDL SDH

    NoiseCanceller

    S

    R

    Q

    Q

    UVLO

    VS

    VB

    SET

    RESET

    DELAY

    SH

    OR

    T-P

    ULS

    EG

    EN

    ER

    ATO

    R

    15V SHUNTREGULATOR

    1

    RT

    CPH

    VDD

    PGND

    OUT

    VB

    VDC

    IRT

    LOW-SIDE GATE DRIVER

    PRE-HEAT Control

    HIGH-SIDE DRIVER

    UVLO

    S

    R Q

    QTSDBIAS

    BGR

    SYSHALT

    UVLO SDH

    SDL

    10V REG

    Reference

    VD

    D Sense

    BIAS & SYSTEM LATCH

    SGND

    2

    3

    4

    5

    6

    7

    8

    CPH

  • FAN

    7710 B

    allast Control IC

    for Com

    pact Fluorescent Lamps

    2FAN

    Pin Configuration

    Figure 3. Pin Configuration (Top View)

    Pin DefinitionsPin # Name Description

    1 VDD Supply voltage

    2 RT Oscillator frequency set resistor

    3 CPH Preheating time set capacitor

    4 SGND Signal ground

    5 PGND Power ground

    6 OUT High-side floating supply return

    7 VB High-side floating supply

    8 VDC High-voltage supply

    FAN7710YWW

    1 2 3 4

    8 7 6 5

    VDD RT CPH SGND

    VDC VB OUT PGND

    FAN7710 Rev. 1.00

    (YWW : Work Week Code)

    007 Fairchild Semiconductor Corporation www.fairchildsemi.com7710 Rev. 1.0.2 3

  • FAN

    7710 B

    allast Control IC

    for Com

    pact Fluorescent Lamps

    2FAN

    Absolute Maximum RatingsStresses exceeding the absolute maximum ratings may damage the device. The device may not function or beoperable above the recommended operating conditions and stressing the parts to these levels is not recommended. Inaddition, extended exposure to stresses above the recommended operating conditions may affect device reliability.The absolute maximum ratings are stress ratings only. TA=25C unless otherwise specified.

    Note: 1. Do not supply a low-impedance voltage source to the internal clamping Zener diode between the GND and the VDD

    pin of this device.

    Symbol Parameter Min. Typ. Max. UnitVB High-side floating supply -0.3 575 V

    VOUT High-side floating supply return -0.3 550 V

    VIN RT, CPH pins input voltage -0.3 8 V

    ICL Clamping current level 25 mA

    dVOUT/dt Allowable offset voltage slew rate 50 V/ns

    TA Operating temperature range -25 125 C

    TSTG Storage temperature range -65 150 C

    PD Power dissipation 2.1 W

    JA Thermal resistance (junction-to-air) 70 C/W

    007 Fairchild Semiconductor Corporation www.fairchildsemi.com7710 Rev. 1.0.2 4

  • FAN

    7710 B

    allast Control IC

    for Com

    pact Fluorescent Lamps

    2FAN

    Electrical CharacteristicsVBIAS (VDD, VB -Vout) = 14.0V, TA = 25C, unless otherwise specified.

    Note:2. This parameter, although guaranteed, is not 100% tested in production.

    Symbol Parameter Condition Min. Typ. Max. UnitHigh-Voltage Supply Section

    VDC High-voltage supply voltage 550 V

    Low-Side Supply Section (VDD)VDDTH(ST+) VDD UVLO positive going threshold VDD increasing 12.4 13.4 14.4

    VVDDTH(ST-) VDD UVLO negative going threshold VDD decreasing 10.8 11.6 12.4

    VDDHY(ST) VDD-side UVLO hysteresis 1.8

    VCL Supply clamping voltage IDD =20mA 14.8 15.2

    IST Start-up supply current VDD = 10V 120 A

    IDD Dynamic operating supply current Running freq,CL = 1nF 2.6 mA

    High-Side Supply Section (VB-VOUT)VHSTH(ST+) High-side UVLO positive going threshold VB -VOUT increasing 8.5 9.2 10.0

    VVHSTH(ST-) High-side UVLO negative going threshold VB -VOUT decreasing 7.9 8.6 9.5

    VHSHY(ST) High-side UVLO hysteresis 0.6

    IHST High-side quiescent supply current VB -VOUT = 14V 50A

    IHDHigh-side dynamic operating supply current Running freq,CL = 1nF 250

    Oscillator SectionVMPH CPH pin preheating voltage range 2.5 3.0 3.5 V

    IPHCPH pin charging current during preheating VCPH = 1V 1.25 2.00 2.85 A

    IIG CPH pin charging current during ignition VCPH = 4V 8 12 16

    VMO CPH pin voltage level at running mode 7.0 V

    fPRE Preheating frequency RT = 80k, VCPH = 2V 72 85 98 kHz

    fOSC Running frequency RT = 80k 48.7 53.0 57.3 kHz

    DTMAX Maximum dead timeVCPH = 1V, VOUT = GND during preheat mode 3.1 s

    DTMIN Minimum dead timeVCPH = 6V, VOUT= GND during run mode 1.0 s

    Protection SectionVCPHSD Shutdown voltage VRT = 0 after run mode

    2.6 V

    ISD Shutdown current 250 450 A

    TSD Thermal shutdown(2) 165 C

    MOSFET SectionILKMOS MOSFET leakage current VDS = 500V 10 A

    RON On resistance (dynamic)VGS = 12V, ID = 100mA 6.2 VGS = 12V, ID = 500mA 6.5

    ISAT Saturation current(2) VGS = 12V, VDS = 30V 800 mA

    007 Fairchild Semiconductor Corporation www.fairchildsemi.com7710 Rev. 1.0.2 5

  • FAN

    7710 B

    allast Control IC

    for Com

    pact Fluorescent Lamps

    2FAN

    Typical Characteristics

    Figure 4. Start-up Current vs. Temp. Figure 5. Preheating Current vs. Temp.

    Figure 6. Ignition Current vs. Temp. Figure 7. Operating Current vs. Temp.

    Figure 8. High-Side Quiescent Current vs. Temp. Figure 9. Shutdown Current vs. Temp.

    007 Fairchild Semiconductor Corporation www.fairchildsemi.com7710 Rev. 1.0.2 6

  • FAN

    7710 B

    allast Control IC

    for Com

    pact Fluorescent Lamps

    2FAN

    Typical Characteristics (Continued)

    Figure 10. VDD UVLO+ vs. Temp. Figure 11. VDD UVLO- vs. Temp.

    Figure 12. VHS UVLO+ vs. Temp. Figure 13. VHS UVLO- vs. Temp.

    Figure 14. VDD Clamp Voltage vs. Temp. Figure 15. Running Frequency vs. Temp.

    007 Fairchild Semiconductor Corporation www.fairchildsemi.com7710 Rev. 1.0.2 7

  • FAN

    7710 B

    allast Control IC

    for Com

    pact Fluorescent Lamps

    2FAN

    Typical Characteristics (Continued)

    Figure 16. Preheating Frequency vs. Temp. Figure 17. Maximum Dead Time vs. Temp.

    Figure 18. Minimum Dead Time vs. Temp. Figure 19. Internal MOSFET Turn-on Resistance vs. Temp.

    007 Fairchild Semiconductor Corporation www.fairchildsemi.com7710 Rev. 1.0.2 8

  • FAN

    7710 B

    allast Control IC

    for Com

    pact Fluorescent Lamps

    2FAN

    Typical Application Information1. Under-Voltage Lockout (UVLO) FunctionThe FAN7710 has UVLO circuits for both high-side andlow-side circuits. When VDD reaches VDDTH(ST+), UVLOis released and the FAN7710 operates normally. AtUVLO condition, FAN7710 consumes little current, notedas IST. Once UVLO is released, FAN7710 operatesnormally until VDD goes below VDDTH(ST-), the UVLOhysteresis. At UVLO condition, all latches that determinethe status of the IC are reset. When the IC is in theshutdown mode, the IC can restart by lowering VDDvoltage below VDDTH(ST-).

    FAN7710 has a high-side gate driver circuit. The supplyfor the high-side driver is applied between VB and VOUT.To protect from malfunction of the driver at low supplyvoltage between VB and VOUT, FAN7710 provides anadditional UVLO circuit between the supply rails. If VB-VOUT is under VHSTH(ST+), the driver holds low state toturn off the high-side switch, as shown in Figure 20. Aslong as VB-VOUT is higher than VHSTH(ST-) after VB-VOUTexceeds VHSTH(ST+), operation of the driver continues.

    2. OscillatorThe ballast circuit for a fluorescent lamp is based on theLCC resonant tank and a half-bridge inverter circuit, asshown in Figure

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