Fairchild Power Switch(FPS) TV Solution Power Conversion

2 Features and Advantages of FSCQ-series  Features Optimized for Quasi-resonant converter (Low EMI and High Efficiency) Fully avalanche rated and 100% tested SenseFET Pulse-by-pulse current limiting Improved reliability through various protection functions  Over voltage, Over load, Over current, Thermal shutdown Advanced Burst operation for low power consumption in standby (<1W) Internal Soft start function (20ms) Extended Quasi-resonant operation for wide operation range Reduced startup and operating currents  Advantages Reduced board space (simple & compact circuit design) Decreased assembly time and field failure rate  Enhanced productivity

3 FSCQ-series Functional Block Diagram QRC Control Burst Mode Operation TSD OLP OVP AOCP Latch Mode Current Mode Control Auto Restart Mode SenseFET

4 FPS lineup for CRT-TV application Device FunctionProtection Option PKG Vdmax (V) Ipeak (A) Po(max) (1) VAC Fopr (KHz) Rds(on) Max (  ) OLPOCLOVPTSD High Power Quasi-Resonant Converter Applications Color TV KA5Q0565RT QRC2.2YES TO-220F-5L KA5Q0740RT QRC1.1YES TO-220F-5L KA5Q0765RTH QRC1.6YES TO-220F-5L KA5Q12656RTH QRC0.9YES TO-220F-5L KA5Q1265RFH QRC0.9YES TO-3PF-5L KA5Q1565RF QRC0.65YES TO-3PF-5L FSCQ0565RT QRC2.2YES TO-220F-5L FSCQ0765RT QRC2.0YES TO-220F-5L FSCQ0965RT QRC1.6YES TO-220F-5L FSCQ1265RT QRC0.9YES TO-220F-5L FSCQ1465RT QRC0.70YES TO-220F-5L FSCQ1565RT QRC0.65YES TO-220F-5L FSCQ1565RP QRC0.65YES TO-3PF-7L

5 KA5Q series V.S FSCQ-series GenerationKA5Q-SeriesFSCQ-SeriesFSCQ Advantages Control Method QRC/PSR High Efficiency/Low EMI QRC with high frequency limit High Efficiency/Low EMI Temp. of device can be lower at high line input Start-up current /Operation current Max. 200uA / 18mA(always constant) Max. 50uA / 6mA(reduced in burst mode) Lower standby power Output regulation in standby By Vcc controlBy Feedback controlJust difference of method Output voltage drop in standby About halfAny level Lower standby power but MCU reset must be considered Standby powerUnder 2W Under 1W Soft startNone20mS Reducing stress on Power MOSFET & transformer SenseFETQ-FETS-FET PKGTO220F-5L/TO3PF-5LTO220F-5L/TO3PF-7L Same PCB pattern can be used for different PKG

6 Power Consumptions in standby mode

7 Typical Application circuit

8 Normal Quasi-Resonant Switching Advantages -Reduced switching noise (Low EMI) -Improved efficiency -Removed RCD snubber

9 Normal Quasi-Resonant Switching  Limitations -Intermittent switching at light load due to a relatively large LEB time -Increased switching loss at light load

10 Extended Quasi-Resonant Switching Advantages -Guarantee stable operation over wide load range -Improve efficiency at light load condition

11 Internal Soft-start Internal soft start (20ms) For a fast output build up, offset is introduced in the soft start 85V input 265V input

12 Over load Protection - Output short 85V input 265V input

13 Abnormal over current protection – Diode short 85V input 265V input

14 Over voltage protection -Feedback open 85V input 265V input

15 Burst operation - basic features -Drop output voltage to below half (any level) to minimize the loss caused by leakage current in the high voltage output -Reduce the effective switching frequency to minimize switching loss -Reduce the FPS operating current in the burst operation

16 Burst operation - Output drop circuit -Normal mode : Vo1 (B+) is regulated -Standby mode : Vo2 is regulated

17 Burst operation waveforms Normal  Standby Standby  Normal

18 Burst operation waveforms Vi=85VacVi=265Vac 1. Vds 2. Vcc 3. Vfb 4. Id