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LT1508CSW Datasheet(PDF) 1 Page - Linear Technology |
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LT1508CSW Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LT1508 Power Factor and PWM Controller (Voltage Mode) , LTC and LT are registered trademarks of Linear Technology Corporation. s PFC and PWM Single Chip Solution s Synchronized Operation up to 300kHz s 99% Power Factor Over 20:1 Load Current Range s Voltage Mode PWM s Instantaneous Overvoltage Protection s Dedicated Overvoltage Protection (OVP Pin) s Minimal Line Current Dead Zone s Typical 250 µA Start-Up Supply Current s Line Switching Noise Filter s Low Quiescent Current: 13mA s Fast 1.5A Peak Current Gate Drivers s Separate Soft Start Control FEATURES DESCRIPTION APPLICATIONS s Universal Power Factor Corrected Power Supplies and Preregulators The LT ® 1508 is a complete solution for universal off-line switching power supplies utilizing active power factor correction. The PFC section is identical to the LT1248 PFC controller except the EN/SYNC pin is removed because PFC and PWM are synchronized internally. The voltage mode PWM section (LT1509 is the current mode counterpart) contains all the primary side functions to convert the PFC preregulated high voltage output to an isolated low voltage output. The PWM duty cycle is internally limited to 47% (maximum 50%) to prevent transformer saturation. PWM soft start begins when the PFC output reaches the preset voltage. In the event of brief line loss, PWM will be shut off when the PFC output voltage drops below 73% of the preset value. – + + – + – 11 16 13 + – + – – + IM = IA2IB 200 µA2 4 15 19 18 1508 BD VSENSE 7.5V 7.9V VCC 16V TO 10V 14 µA 14 µA 7 µA 7V TO 4.7V – + EA CA – + CL 2.2V M1 IA IM IB 25k 1V R 2R 14 VAOUT 10 VREF 7.5V VREF 12 MOUT 8 ISENSE 7 CAOUT 6 CSET RSET ILIM VC 50 µA RUN RUN R R Q S S RQ R OSC 55% DELAY 200ns BLANKING PKLIM 5 GND1 3 VCC 17 GTDR1 16V 16V 1 GND2 2 GTDR2 20 IAC 9 OVP SS1 SS2 PWMOK 0.7V + – + – NOTE: PWM PULSE IS DELAYED BY 55% DUTY CYCLE AFTER PFC PULSE – + – + BLOCK DIAGRAM |
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