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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LT3751EUFD датащи(PDF) 26 Page - Linear Technology |
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LT3751EUFD датащи(HTML) 26 Page - Linear Technology |
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26 / 28 page  LT3751 26 3751f TYPICAL APPLICATIONS Regulation Efficiency vs Load Current (VOUT = 500V) VOUT vs Load Current Steady-State Operation with 100mA Load Current 18A Non-Isolated, High-Voltage Regulator CHARGE CLAMP VCC DONE FAULT UVLO1 OVLO1 UVLO2 OVLO2 RDCM RVOUT HVGATE LVGATE CSP CSN FB RVTRANS T1 1:10 D1 VOUT 50V TO 500V VTRANS 5V TO 24V VCC 3751 TA04 LT3751 GND RBG R6 40.2k OFF ON C3 680μF C2 5× 2.2μF C1 10μF • • R7, 18.2k R8, 40.2k M1* R5 6mΩ + C4*** 100μF R9 VTRANS VCC R1, 475k R2, 69.8k R3, 475k R4, 69.8k C1: 25V X5R OR X7R CERAMIC C2: 25V X5R OR X7R CERAMIC C3: 25V ELECTROLYTIC C5: TDK CKG57NX7R2J474M D1: VISHAY US1M 1000V M1: FAIRCHILD FQP34N20L R1 THRU R4, R6 THRU R9, R11: USE 1% 0805 R5: IRC LR SERIES 2512 RESISTORS R10A, R10B, R10C USE: 200V 1206 RESISTORS T1: COILCRAFT GA3459-AL *M1 REQUIRES PROPER HEATSINK/THERMAL DISSIPATION TO MEET MANUFACTURER’S SPECIFICATIONS **DEPENDING ON DESIRED OUTPUT VOLTAGES, R10 MUST BE SPLIT INTO MULTIPLE RESISTORS, TO MEET MANUFACTURER’S VOLTAGE SPECIFICATION. ***C4 MUST BE SIZED TO MEET LARGE SIGNAL STABILITY CRITERIA DESCRIBED IN THE APPLICATIONS INFORMATION SECTION TO MICRO VCC 5V TO 24V C5 0.47μF R11 R10** DANGER HIGH VOLTAGE! OPERATION BY HIGH VOLTAGE TRAINED PERSONNEL ONLY C6 10nF 10μs/DIV 3751 TA03b VSW 50V/DIV IPRI 10A/DIV VOUT AC COUPLED 2V/DIV OUTPUT VOLTAGE (V) 0 90 85 75 80 70 65 60 200 3751 TA03c 100 150 50 VTRANS = 24V VTRANS = 12V VTRANS = 5V ILOAD (mA) 0 515 510 505 500 495 200 3751 TA03d 100 150 50 VTRANS = 24V VTRANS = 12V VTRANS = 5V 10μs/DIV 3751 TA03e VSW 50V/DIV IPRI 10A/DIV VOUT COUPLED 2V/DIV Steady-State Operation with 1.1mA Load Current Suggested Component Values VOUT(V) R9 (kΩ) R11(kΩ) R10(kΩ) 100 3.32 0.383 30.9 200 1.65 0.768 124 300 1.10 1.13 274 400 0.825 1.54 499 500† Tie to GND 1.74 715 †Transformer primary inductance limits VOUT comparator operation to VOUT = 400VMAX. RVOUT and RBG should be tied to ground when operating VOUT above 400V. |
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