EVAL6574B

EVAL6574B CFL/TL ballast driver preheat and dimming demonstration board based on the L6574 Data brief Description EVAL6574B Features       Dimmable fluorescent lamp ballast Multiple T8 lamps application Wide range input (85 Vac – 265 Vac) PF > 0.99, THD < 10% Fault ignition protection Lamp absence detection May 2013 This design was developed to drive a TL fluorescent lamp of up to 58 W. It is composed of two sections: the PFC using the L6561 controller, and the ballast based on the L6574. The application includes a current feedback that can be used to control the power (and, if necessary, the dimming function) by varying the switching frequency during normal lamp operation. The application also features safety circuitry which activates when an open load or faulty lamp ignition is detected. The PFC pre-regulator allows connection of the application to a wide input voltage range (85 Vac to 265 Vac) providing a Power Factor higher than 0.99 and a THD lower than 10%. DocID024443 Rev 1 1/8 www.st.com Board description 1 EVAL6574B Board description Table 1: Board electrical specifications Parameter Value Input voltage 85 Vac to 265 Vac Power factor > 0.99 THD < 10% Output power Up to 58 W Lamp configuration Single lamp – tubular T8 model (32 W to 58 W) Figure 1: Jumper and connector locations Table 2: Connector A pinout 2/8 Name Type Function MAIN (AC IN) Screw connector Input voltage connection LAMP Screw connector Lamp connection DocID024443 Rev 1 F use C1 B1 R3 R2 R1 R4 DocID024443 Rev 1 C2 2 3 6 C4 5 C3 R8 U1 R5 R6 T1 1 8 4 7 R7 D1 C5 R S_1 R 11 R 10 R9 NTC Q1 D2 R 13 P1 C6 C7 D3 C8 R 12 DZ1 C 10 R 14 R 15 R 18 R 16 D4 C9 R 17 C 19 4 5 6 7 2 C 11 C 12 3 12 R 19 1 U2 C 13 16 10 9 8 11 14 15 C 12 R 20 C 15 R 22 R 21 R S_2 R 23 1k Q3 Q2 C 16 D5 R 25 R 27 R 26 R 24 L2 2 R 28 R 29 4 LAM P 5 1 C 17 C 18 EVAL6574B Figure 2: Schematic Board description 3/8 Board description EVAL6574B Table 3: Bill of material 4/8 Reference Part value Part description R1 750 kΩ Resistor 250 mW 1% R2 750 kΩ Resistor 250 mW 1% R3 10 kΩ Resistor 250 mW 1% R4 120 kΩ Resistor 250 mW 1% R5 120 kΩ Resistor 250 mW 1% R6 68 kΩ Resistor 250 mW 1% R7 22 Ω Resistor 250 mW 1% R8 10 kΩ Resistor 250 mW 1% R9 750 kΩ Resistor 250 mW 1% R10 750 kΩ Resistor 250 mW 1% R11 9.53 kΩ Resistor 250 mW 1% R12 82 kΩ Resistor 250 mW 1% R13 1.5 kΩ Resistor 250 mW 1% R14 10 Ω Resistor 250 mW 1% R15 10 kΩ Resistor 250 mW 1% R16 100 kΩ Resistor 250 mW 1% R17 47 Ω Resistor 250 mW 1% R18 100 kΩ Resistor 250 mW 1% R19 10 kΩ Resistor 250 mW 1% R20 6.8 kΩ Resistor 250 mW 1% R21 22 Ω Resistor 250 mW 1% R22 22 Ω Resistor 250 mW 1% R23 1 kΩ Resistor 250 mW 1% R24 390 kΩ Resistor 250 mW 1% R25 20 kΩ Resistor 250 mW 1% R26 750 kΩ Resistor 250 mW 1% R27 750 kΩ Resistor 250 mW 1% R28 3.9 kΩ Resistor 250 mW 1% R29 6.8 kΩ Resistor 250 mW 1% RS_1 0.68 Ω Resistor 250 mW 1% RS_2 0.68 Ω Resistor 250 mW 1% P1 5 kΩ Trimmer 10 turns (Bourns / Spectrol) NTC1 5Ω Thermistor 3 W (EPCOS) C1 330 nF Film Capacitor 400 V (Panasonic / Rubycon) C2 10 nF Capacitor 50 V C3 220 nF Capacitor 50 V DocID024443 Rev 1 EVAL6574B Board description Reference Part value Part description C4 680 nF Capacitor 50 V C5 100 nF Capacitor 50 V C6 22 µF Electrolytic capacitor, 450 V low ESR C7 4.7 µF Electrolytic capacitor, 35 V C8 100 nF Capacitor 50 V C9 8.2 nF Capacitor 50 V C10 4.7 nF Capacitor 50 V C11 680 pF Film capacitor 630 Vdc C12 100 nF Capacitor 50 V C13 1 µF Capacitor 50 V C14 100 nF Capacitor 50 V C15 330 nF Capacitor 50 V C16 470 nF Capacitor 50 V C17 100 nF Polypropilene capacitor 250 Vdc C18 8.2 nF Polypropilene capacitor 1600 Vdc C19 100 nF Capacitor 50 V F1 T 2A Fuse 250 Vac – 2 A PFC transformer: 1.88 mH, 138 : 13 turns, core E25 – N87 or eq. T1 L2 2.1 mH Ballast inductor: 2 mH, 146 turns, core E25 – N87 or eq. B1 W04M Rectifier bridge 4 A – 600 V D1 1N4148 D2 STTH1L06 D3 1N4148 Diode D4 1N4148 Diode D5 1N4148 Diode DZ1 BZX79C15 U1 L6562 PFC controller U2 L6574 Ballast controller Q1 STP5NK50Z N-channel 500 V – 1.22 Ω Zener-protected SuperMESH™ Power MOSFET Q2 STP4NK50Z N-channel 500 V – 2.4 Ω Zener-protected SuperMESH™ Power MOSFET Q3 STP4NK50Z N-channel 500 V – 2.4 Ω Zener-protected SuperMESH™ Power MOSFET Diode Turbo 2 ultrafast high voltage rectifier 15 V Zener diode CN1 3 way PCB connector 250 Vac, Pin distance 5.08 mm CN2 5 way PCB connector 250 Vac Pin distance 5.08 mm DocID024443 Rev 1 5/8 Board description EVAL6574B Figure 3: Layout (top layer) Figure 4: Layout (bottom layer) Figure 5: Layout (silk screen) 6/8 DocID024443 Rev 1 EVAL6574B 2 Revision history Revision history Table 4: Document revision history Date 23-May-2013 Revision 1 DocID024443 Rev 1 Changes First release 7/8 EVAL6574B Please Read Carefully Information in this document is provided solely in connection with ST products. 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