AND8312/D A 36W Ballast Application with the NCP5104 Prepared by: Thierry Sutto http://onsemi.com NOTE: BEFORE PLUGGING IN THE DEMO BOARD, MAKE SURE THE JUMPER IS ON THE CORRECT POSITION: IF J2 IS USED, THEN Vin MUST BE LOWER THAN 145 Vac. This document describes how the NCP5104 driver can be implemented in a ballast application. The scope of this application note is to highlight the NCP5104 driver and not to explain or detailed how to build electronic ballast. The NCP5104 is a high voltage power MOSFET driver providing two outputs for direct drive of 2 N-channel power MOSFETs arranged in a half-bridge configuration with only one input. It uses the bootstrap technique to insure a proper drive of the High-side power switch. The driver works with one input to accommodate half-bridge topology with a fixed dead time of 520 ns. Detailed Operation The lamp ballast is powered via a half bridge configuration. The 2 power MOSFETs are driven with the NCP5104 driver. The driver is supplied by the VCC rail, and the high side driver is supplied by the bootstrap diode: when the low side power MOSFET (Q2) is switched ON, the BRIDGE pin is pulled down to the ground, thus the capacitor connected between BRIDGE pin and VBOOT pin is refuelled via the diode D3 and the resistor R5 connected to VCC. When Q2 is switched OFF the bootstrap capacitor C6 supplies the high side driver with a voltage equal to VCC level minus the D3 forward voltage diode. Given the NCP5104 architecture, the driver copies the input signal to the high side driver, then it generates a fixed dead time (520 ns) before toggling the low side driver when the input pin level changes. Demo Board Specification • • • • • Input range : 85 Vac - 145 Vac OR 184 Vac - 265 Vac Ballast Output Power : 36 W (type PL-L 36W) Pre-Heating Current : 295 mA Pre-Heating Time : 1 second Nominal Current : 414 mA Figure 1. Dead Time Between the High and Low-Side Driver © Semiconductor Components Industries, LLC, 2007 November, 2007 - Rev. 0 1 Publication Order Number: AND8312/D AND8312/D IN_HI (10 V/div) DRV_HI (10 V/div) IN_LO (10 V/div) DRV_LO (10 V/div) Time (4 ms/div) Figure 2. Input Output Timing Diagram Tube Voltage (100 V /div) Tube current (0.5 V /div) Tube Power (50 W/div) Tube a verage power = 32 Figure 3. Tube Signals http://onsemi.com 2 W 3 http://onsemi.com Figure 4. Demo Board Schematic GND 200pF R15 22k C17 100mF + GND R16 68k 27k R12 GND GND C12 NC GND C13 NC GND + GND 4 3 2 1 D5 GND SD IN VCC GND 1N4936 GND C4 47mF GND 5 6 7 D6 1N4936 R14 390k R6 10R GND 100nF C6 R5 10R C14 220pF/400V DRV_IO Bridge DRV_HI VBOOT 8 1N4936 U2 NCP5104 C5 100nF D3 R9 10k R7 10R R8 10k GND Q2 IRF840LC 1.4mH L1 Q1 IRF840LC 1kV C15 6.8nF BALLAST B1 GND 220nF NC GND 1 6 7 R2 NC R1 22k R4 82k 2W 400V C10 R11 47k C12 NC THR GND DIS Q GND C2 47mF 400V R3 82k 2W C8 CVOLT VCC C3 220mF GND + + + C1 47mF 100V 400V 5 TRIG R 3 GND D1 15V 1.3W 3 1 PT1 220nF 2 4 U1 TLC555C 8 R13 OR F1 T500mA GND 2 4 C7 C16 R10 33k CON2 1 2 J1 AND8312/D AND8312/D Figure 5. PCB Printout: Top and Bottom View http://onsemi.com 4 AND8312/D BILL OF MATERIAL Part Type Designator Manufacturer Description Connector B1, J1 - Connector 47uF/400V C1, C2 Panasonic M Series 220pF C10 Generic Capacitor 10nF C11 Generic Capacitor - Capacitor NC C12, C13 220pF /400V C14 Generic Capacitor 6.8nF/1kV C15 Generic Capacitor NC C16 - Capacitor 100uF C17 Generic Capacitor 220uF C3 Generic Capacitor 4.7uF/50V C4 Generic Capacitor 100nF C5 Generic Capacitor 100nF C6 Generic Capacitor C7, C8 Generic Capacitor 220pF C9 Generic Capacitor BZX85C15V D1 Generic 15V Zener diode ON Semiconductor Fast Recovery rectifier 220nF/400V 1N4936 D3, D5, D6 BZX85C5V1 D4 Generic 5V1 Zener diode T500mA F1 Generic Fuse US-jumper J2 - Jumper for US main supply only 1.4mH L1 VOGT VOGT 53-044 DF06M PT1 - 600V Diode Bridge IRF Low Charge N-Channel MOSFET IRF840LC Q1, Q2 BC547B Q3 Generic NPN transistor 22k R1 Generic Resistor 33k R10 Generic Resistor 47k R11 Generic Resistor 27k R12 Generic Resistor 15k R13 Generic Resistor 390k R14 Generic Resistor 22k R15 Generic Resistor 68k R16 Generic Resistor NC R2 - Resistor R3, R4 Generic Resistor 2W power type 10R R5, R6, R7 Generic Resistor 10k R8, R9 Generic Resistor 82k/2W TLC555C U1 Texas Instrument CMOS 555 timer NCP5104 U2 ON Semiconductor NCP5104 http://onsemi.com 5 AND8312/D ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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