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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LT1508CSW датащи(PDF) 14 Page - Linear Technology |
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LT1508CSW датащи(HTML) 14 Page - Linear Technology |
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14 / 16 page  14 LT1508 APPLICATIONS INFORMATION An LT1431 reference/amplifier coupled to a low cost optoisolator closes the loop from secondary side to pri- mary side. Efficiency versus power and line voltage is shown in Figure 10. The PFC preregulator alone has efficiency numbers between 90% and 97% over line and load. A 3-turn secondary added to the 70-turn primary of T1 bootstraps VCC to about 15V supplying the chip’s 13mA requirement as well as about 39mA to cover the gate current of the three FETs and high side transformer. A 0.15 Ω sense resistor is used to sense input current and servo to the command created by the outer voltage and multiplier. Thus the input current follows the input line voltage, and changes as necessary, in order to maintain constant bank voltage. The forward converter sees a voltage input of 382VDC unless the line voltage drops out, in which case the 330 µF main capacitor discharges to 240VDC before the PWM stage is shut down. Compared to a typical off-line converter, the effective input voltage range of the forward converter is much smaller, simplify- ing the design. Additionally, the higher bus voltage pro- vides greater hold-up times for given capacitor size. VRMS 90 80 85 250 1508 • F1O 75 70 132 180 90 200W/300W 100W 30W Figure 10 |
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