STEVAL-ILB004V1 Demonstration board: multipower ballast for T5 fluorescent tube lamps based on the ST7LIT19BF1 and STP5NK60Z Data Brief Features ■ Improved efficiency ■ Increased lamp life ■ Lightweight with smaller dimensions ■ Better lamp power control Description The STEVAL-ILB004V1 demonstration board is an electronic ballast that adds “intelligence” to ballast circuits, thanks to the use of a microcontroller. Rather than having a dedicated circuit for each tube lamp with a single ballast, the STEVAL-ILB004V1 can drive many different lamp groups. The system is capable of recognizing T5type fluorescent lamps, with power ratings of 24 W, 39 W, 54 W and 80 W. It consists of two main blocks: a boost converter (power factor controller) working in transition mode (fixed TON and variable frequency), and an inverter in half-bridge configuration working in zero-voltage switching. Both the ballast and PFC stages are controlled by the ST7LIT19BF1 microcontroller, which provides its signal to the L6382D5 power management unit. The power management unit delivers the right voltage and current levels to the STP5NK60Z power MOSFET. After tube recognition, the system sets the parameters to drive the lamp correctly. December 2008 STEVAL-ILB004V1 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 1n 275VAC C2 J5 2 1 R28 820 AverageCurrent PFC VinWaveform PFC Vout Sense PFC OC 10nF C10 AverageLampVoltage PeakLampVoltage LampTypeDetection RESET VDC-5V-programm. CSI AverageCurrent AC L N PE J1 C9 220nF C20 1n C22 470n Out pin 1nF 630V C8 3 + + + + + J3 C3 + + + + + 2 4 6 8 10 R5 18k R4 750k R3 750k R46 0.6W 22 R16 0.6W 22 ST7LITE1B 20pin RESET C27 10p C26 10p 100p C4 20 19 18 17 16 15 14 13 12 11 R43 10k 10k 1 2 3 4 5 6 7 8 9 10 C12 100nF 10k R45 10p C25 C11 + 47uF 35V R44 D4 T2 VREF CSI CSO HEG NC HVSU NC OUT HSG BOOT LampPresence PFC Gate Driver High Side Input Low Side Input 10p 2 1N4007 D12 2.0mH 20 19 18 17 16 15 14 13 12 11 R22 33 10 R7 27k C28 R6 L6382 PFI LSI HSI HEI PFG NC TPR GND LSG VCC U2 PFC Mosfet Gate PFC VinWaveform PFC Zero Current Detect PFC Mosfet Gate Low Side Input High Side Input PFC Gate Driver 470n 275VAC OSC1/CLKIN/PC0 OSC2/PC1 PA0(HS)/LTIC PA1(HS)/ATIC PA2(HS)/ATPWM0 PA3(HS)/ATPWM1 PA4(HS)/ATPWM2 PA5(HS)/ATPWM3/ICCDATA PA6/MCO/ICCCLK/BREAK PA7(HS)/COMPOUT ICC-programmer 1 3 5 7 9 U1 D13 STTH1L06A RsenseCurrent Vss Vdd RESET COMPIN+/SS/AIN0/PB0 SCK/AIN1/PB1 MISO/AIN2/PB2 MOSI/AIN3/PB3 COMP-/CLKIN/AIN4/PB4 AIN5/PB5 AIN6/PB6 DC5V 1 2 3 4 5 6 7 8 9 10 1 RsenseCurrent 2x47mH 3 1 3k9 R27 T1 4 2 J4 jump-prog/run 10k R24 R2 1M 350V 4 + - 2 BRIDGE RB156 CSO 4n7 1.8k R52 R21 10 R19 10 1k R14 R51 47k R47 47k RsenseCurrent 2 STTH1L06 D14 0.6W 0 R18 2n7 C5 C6 PFC OC NTC1 10 LampTypeDetection Circuit 1k Lamp Type Detection Circuit Enable 10n C14 1 PFC Vout Sense R10 CSO C13 50V 100nF CSI R9 0.5 2 STTH1L06 D2 STP6NK60Z 1 PFC Zero Current Detect DC5V Q1 1 R8 47k 1 8 1 D7 3 5 R1 1M 350V 1 2 3 1 2 2 3 C1 220n 275VAC R49 10k Q5 BF420 Q4 BF421 R13 10k R12 750k R11 750k 10k R54 22uF 450V C7 R23 1 2W,1% 1.2mH L1 C23 68n C30 330n R36 22k PeakLampVoltage Out pin R48 3.3k Vcap 470n C18 AverageLampVoltage LampTypeDetection Circuit Q3 STP6NK60Z Q2 STP6NK60Z + DC400V 1M R29 R40 2k2 R39 220k R38 220k 1N4148 SMD D6 C19 4n7 100V LampPresence DC5V LampTypeDetection C17 10n R30 10k R53 100nF 400V C15 75k R35 R41 2k2 1M DC5V R37 220k Vcap 1 FUSE 2 2/4 T5 Lamps J2 R34 120k R33 330k R32 330k R31 330k Vcap C16 10n 1600V Figure 1. 4 1 3 F1 Schematic diagram STEVAL-ILB004V1 Schematic diagram Electrical schematic STEVAL-ILB004V1 2 Revision history Revision history Table 1. Document revision history Date Revision 02-Dec-2008 1 Changes Initial release. 3/4 STEVAL-ILB004V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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