HR2000GS

HR2000 Fluorescent Lamp HB Driver with PFC The Future of Analog IC Technology DESCRIPTION FEATURES The HR2000 is a fluorescent lamp ballast controller with PFC function and high voltage half-bridge driver. Only 16pin is used to offer cost effective solutions with minimized external components. PFC PART • Only four pins realize PFC function. • Ton control. • Boundary Conduction Mode operation. • Less peripheral components. • Over voltage and over current protection. The HR2000 can properly drive the two MOSFETs of half-bridge to control fluorescent lamp, ensuring all the features at the same time. The operating frequency is programmable and the sweeping frequency is controlled to limit the preheat current. The preheat time and ignition time can be smartly set up for types of lamps and applications. Sufficient protection functions are provided for different fault modes such as over voltage, over current, over temperature, capacitive mode, end of life (EOL). Preheat driving signal is offered in preheat state to meet low power loss application which usually needs a MOSFET to cut off filament transformer. The PFC part only uses 4 pins to realize PFC function with On-time (Ton) control at boundary conduction mode (BCM). It is suitable for wide input range. Over voltage protection and over current protection are integrated for the PFC part. HALF-BRIDGE PART • 600V bootstrap half-bridge driver. • Programmable preheat current. • Programmable preheat time. • Programmable ignition time. • Single ignition attempt. • Over voltage protection. • Over current protection. • End-Of-Life protection • Capacitive mode protection. • Minimized external components. • Over temperature protection APPLICATIONS • • Tube fluorescent lamp ballast Compact fluorescent lamp ballast All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. The HR2000 is available in the 16-pin SOIC16 package. HR2000 Rev. 1.0 2/20/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 1 HR2000 — FLUORESCENT LAMP HB DRIVER WITH PFC TYPICAL APPLICATION D105 D103 D101 D106 T101 * R108 * C101 Mains Q101 C102 R104 D102 D104 R105 R111 R106 D107 R103 R109 R101 R102 R110 R107 C103 D201 C210 R206 C208 VO ZCD OVC CT FC CP/EOL REF Pre/FT C104 C201 C202 C203 R201 HR2000 16 1 15 2 3 14 4 13 5 12 6 11 7 10 8 9 Z201 GATE GND VCC LG CS SW UG BST C206 Q201 C209 L201 Lamp Q202 C204 R204 C207 C205 R203 R208 C211 C213 R207 R205 R202 D202 D203 C212 R209 Figure 1 HR2000 Rev. 1.0 2/20/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 2 HR2000 — FLUORESCENT LAMP HB DRIVER WITH PFC ORDERING INFORMATION Part Number* Package Top Marking HR2000GS SOIC16 HR2000 * For Tape & Reel, add suffix –Z (e.g. HR2000GS–Z). PACKAGE REFERENCE HR2000 SOIC16 PACKAGE (TOP VIEW) HR2000 Rev. 1.0 2/20/2013 VO 1 16 GATE ZCD 2 15 GND OVC 3 14 VCC CT 4 13 LG FC 5 12 CS CP/EOL 6 11 SW REF 7 10 UG Pre/FT 8 9 BST www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 3 HR2000 — FLUORESCENT LAMP HB DRIVER WITH PFC LIMITING VALUE (1) A B C D E F G H I I J K L Condition Operation High side floating supply voltage Voltage at SW Voltage at pin CS Current in pin CS Voltage at pin UG Voltage at pin LG Low voltage supply Low voltage supply Clamp current in pin VCC Voltage at pin ZCD Voltage at pin OVC Current in pin VO Current in pin CT Note7 tVvcc(reset), this pin will be detected. If VPreFT>Vfault(reset), IC will not start up. Non oscillating state: VCC under voltage state In non-oscillating state, IC stops to work. There are 4 sub-states:
Start up state;
Fault state; There is a hysteresis for Vcc detection. When power on, HR2000 begin’s to work after Vvcc>Vvcc(start). If VvccVfault(reset), then IC will not start up. The second one is after Pre/FT pin’s detection function is active in all oscillating sub-states, HR2000 will get into Fault state if Pre/FT pin voltage VPreFT>Vfault(ref) & low side drive is high. The following items will affect Pre/FT pin in oscillation state. The voltage detected by the sample circuit such as C211, C212, C213, D202, R204, R205 in Fig1.
Preheat state;
Ignition state;
Burn state; Half-bridge oscillator The oscillating frequency is programmed by the capacitor on CT pin. The capacitor on CT pin is charged by internal current source which is related to REF pin resistor and FC pin voltage which is voltage controlled current source for CT pin. The waveform of CT pin is saw-tooth and its frequency is twice of the half-bridge operating frequency. There is a dead time between UG and LG for ensuring their non-overlap operating. The dead time is defined by REF resistor. FC pin controls the operating frequency directly. Higher Vfc results in a lower frequency. HR2000 Rev. 1.0 2/20/2013 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 14 HR2000 — FLUORESCENT LAMP HB DRIVER WITH PFC Preheat State When Vvcc>Vvcc(start) & VPreFTVcs(pre) in a switching period, the FC pin will be discharged by an internal current source IFC(disch) cycle-by-cycle. This controls the working frequency.
EOL protection
Capacitive mode protection
Current limit
VCC low protection Ignition State
Over temperature protection Ignition state follows preheat state closely. In this state, EOL protection and CS(pre) limit are disabled. FC voltage increases which results in frequency decreasing. Then the voltage on lamp gets higher and higher to ignite the lamp. EOL protection ‘End of Life’(EOL) protection is enabled after CP/EOL is dropped to Veol(middle). There is a window comparator for this protection. If the voltage on CP/EOL pin get out of Veol(low)~Veol(high), then the current source Ifault(ch) will charge the capacitor at Pre/FT pin. If VPreFT>Vfault(ref), then HR2000 will get into fault state. CP/EOL pin also only takes timing function in this state. Once preheat state is over, Pre/FT pin is dropped to Vfault(reset2), and then the detection function is active. If Pre/FT pin VPreFT>Vfault(ref) & low side drive is high, then HR2000 will consider it is fault state. After preheat state, CS pin over current protection is active and limits CS voltage (power stage current). When Vcs>Vcs(clamp) @ low side drive=high, the impedance of CS pin will become very small and a current flows into this pin. The koc of this current will charge the CT pin to increase frequency. The low side MOSFET will be turned off quickly while high side MOSFET will not be affected. This results in a narrow turn on time of low side MOSFET and a relatively larger turn on time of high side MOSFET. This asymmetric operation of half bridge limits the output power. Burn state After ignition state, Burn state is entered. At the beginning of burn state, CP/EOL pin will be dropped to the middle level of the EOL detection HR2000 Rev. 1.0 2/20/2013 This protection is disabled in PFC Vo-low state. Capacitive mode protection The capacitive mode protection is active during all oscillating states. It is detected by the voltage on CS at the moment of turning on of low side MOSFET. If at this moment, Vcs>Vcs(cap), then capacitive mode is confirmed and FC pin is discharged at this switching cycle. VFC will decrease towards zero which means the maximum frequency if the capacitive mode always exists. If capacitive mode @ fmax is detected, then Ifault(ch) is actived to charge the capacitor at Pre/FT pin. Current limit The current limit is realized on CS pin. There are three kinds of limitation on CS pin. Vcs(pre) in preheat state; Vcs(clamp) of over current protection function in oscillating states; www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. 15 HR2000 — FLUORESCENT LAMP HB DRIVER WITH PFC Capacitive protection in oscillating states. They have been described in the related states above. VCC low protection It is mentioned in VCC under voltage state. Over temperature protection (OTP) It is described in OTP state. PFC part In the typical application, PFC can be defined to 3 states:
Normal state;
VO-low state;
OVC state; The Ton is set by the voltage at Vo pin. Higher Vvo, shorter Ton. The circuit in Fig1 shows the example. ZCD pin detects the inductor current zero-crossing point. When The Vzcd Vvo(off), Ton is zero, and GATE pin is low. The minimum turn off time is set internally to 1.4µs. Vo-low state In case of main voltage too low, PFC may not maintain its intended output voltage. In order to keep on working, the current sunk into Vo pin is monitored. If it is lower than Ivo(low) the IC will get into Vo-low state. Normal state In Vo-low state: PFC works at boundary conduction mode (BCM) with Ton control. Fig3 shows the internal block. There is a current Ifault(disch) to discharge Pre/FT pin. This can increase the protection level. EOL protection is disabled. VovcVovcref or Vovc