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LT3751EUFD 数据表(PDF) 25 Page - Linear Technology |
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LT3751EUFD 数据表(HTML) 25 Page - Linear Technology |
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25 / 28 page  LT3751 25 3751f TYPICAL APPLICATIONS 42A Capacitor Charger CHARGE CLAMP VCC DONE FAULT UVLO1 OVLO1 UVLO2 OVLO2 RDCM RVOUT HVGATE LVGATE CSP CSN FB RVTRANS T1** 1:10 D1 VOUT 500V VTRANS 12V TO 24V VCC 3751 TA02 LT3751 GND RBG R6 40.2k OFF ON C3 1000μF C2 10μF VCC 12V TO 24V C1 10μF • • R7, 18.2k R8, 40.2k M1, M2* R5 2.5mΩ D2*** + C4 1200μF R9 787Ω VTRANS VCC R11, 100k R12, 100k R1, 191k R2, 475k R3, 191k R4, 475k C1: 25V X5R OR X7R CERAMIC CAPACITOR C2: 25V X5R OR X7R CERAMIC CAPACITOR C3: 25V ELECTROLYTIC C4: HITACHI FX22L122Y 1200μF, 550V ELECTROLYTIC D1, D2: VISHAY GURB5H60 600V, 5A ULTRAFAST RECTIFIER M1, M2: 2 PARALLEL VISHAY SUD33N20-60P 200V, 33A NMOS R1 THRU R4: USE 1% RESISTORS R6 THRU R8: USE 1% 0805 RESISTORS R5: USE 2 PARALLEL 5mΩ IRC LR SERIES 2512 RESISTORS T1: COILCRAFT GA-3460-BL 50A SURACE MOUNT TRANSFORMER *M1, M2 REQUIRES PROPER HEATSINK/THERMAL DISSIPATION TO MEET MANUFACTURER’S SPECIFICATIONS **THERMAL DISSIPATION OF T1 WILL LIMIT THE CHARGE/DISCHARGE DUTY CYCLE OF C4 ***D2 MAY BE OMITTED FOR OUTPUT VOLTAGE OPERATION BELOW 300V DANGER HIGH VOLTAGE! OPERATION BY HIGH VOLTAGE TRAINED PERSONNEL ONLY FOR ANY VOUT VOLTAGE BETWEEN 50V AND 500V SELECT R9 ACCORDING TO: R9 = 0.98 •N • 40.2k VOUT + VDIODE Charging Efficiency vs Output Voltage Output Capacitor Charge Times vs Capacitance Charging Waveform OUTPUT VOLTAGE (V) 50 85 80 75 70 65 450 3751 TA02b 250 350 150 VTRANS = 12V VTRANS = 24V OUTPUT CAPACITANCE (μF) 200 1200 800 400 0 1000 3751 TA02c 1200 800 600 400 VOUT = 500V, VTRANS = 24V VOUT = 500V, VTRANS = 12V VOUT = 300V, VTRANS = 24V VOUT = 300V, VTRANS = 12V VOUT = 100V, VTRANS = 24V VOUT = 100V, VTRANS = 12V 100ms/DIV 3751 TA02d VOUT = 500V VTRANS = 24V C4 = 1200μF AVERAGE INPUT CURRENT 5A/DIV VOUT 100V/DIV |
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