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SC4810BIMLTRT Datasheet(PDF) 9 Page - Semtech Corporation |
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SC4810BIMLTRT Datasheet(HTML) 9 Page - Semtech Corporation |
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9 / 24 page  9 2006 Semtech Corp. www.semtech.com SC4810B/E POWER MANAGEMENT Application Information Introduction The SC4810B/E is a 16 pin BICMOS peak current mode controlled PWM controller for isolated DC-DC and off- line switching power supplies. It features a high switching frequency of operation, programmable limits for both power transformer voltage-second product and maximum PWM duty cycle, line under-voltage lockout, auxiliary switch activation complementary to main power switch drive, programmable leading-edge delay time between activation of each switch, multiple protection features with programmable cycle -by-cycle current limit and hiccup mode over-current protection plus soft-restart. It operates in a fixed frequency programmed by external components. The separate sync pin simplifies synchronization to an external clock. Feeding the oscillator of one device to the sync of another forces biphase operation which reduces input ripple and input and output filter size. The SC4810 can be applied in an active clamp forward topology with the input voltage ranging from 36V to 72V. This topology allows the converter to achieve an efficiency of 92.4% at normal input voltage of 48V. Circuit Description The schematic of the active clamp forward converter is illustrated in Figure. 1 below. T4 is the power transformer. M17 is the N-channel main switching MOSFET and M15 is the auxiliary N-channel MOSFET. C35 is the reset capacitor for resetting the power transformer’s core. M14 and M16 construct the synchronous rectification circuit. L2 and C32 and C33 construct the low-pass output filtering circuit. T6 is the current sensing transformer. R62 is the reset resistor for resetting the magnetic core of the current sensing transformer. D18 is the rectifying diode. R63 is the current sensing resistor. R60 and C41 construct the low-pass filtering circuit for the sensed current signal. The primary bias circuit consists of R55, R58, D17, Q8, C40, C31, D14 and R51. R55 and R58 construct a voltage divider, which limits the bias voltage to 6.9V until the line voltage reach 36V. D17 is a zener diode that limits the bias voltage to under 8V. R51, D14 and C31 construct the peak charge circuit. The peak charge circuit will provide bias to the PWM IC U9 (SC4810) and the driver U8 (SC1302A) after the converter starts Figure 1: Active Clamp Forward Converter R52 10K R50 5.11 100uF C32 C35 3300pF R78 5.6K C40 10uF 3.3V/30A R70 open C31 0.1uF C46 open C43 100pF R74 4.3K R77 18K D16 open R53 10K M16 Si4842DY 4 5 3 2 1 6 7 8 R80 1.47K R72 5.11K L2 1.3uH R67 50 R64 165k C47 0.01uF R76 3.01K T4 2 4 7 1 6 8 9 10 11 Q9 FMMT718 R62 10K C49 180pF R59 10 C44 220pF C45 open D17 open T6 P8208T 8 7 1 3 R58 8K Q8 FZT458 R73 3.01K R66 open R57 5.11K D20 1N5819HW R79 100K D14 1N4148WS C50 1000pF D13 1N4148WS C51 0.01uF R61 1.1M D18 1N4148WS M14 Si4842DY R54 20K U9 SC4810 4 11 3 10 15 5 9 7 6 16 13 8 RCT FB SYNC CS OUT1 DMAX SS DELAY1 RAMP VREF OUT2 DELAY2 C42 open 48V M15 Si4488DY 4 5 3 2 1 6 7 8 C39 0.1uF C48 0.1uF R55 30K R51 5.11 C33 680uF Q7 FZT458 C41 330pF R56 10K R75 100K U10 SC431 R69 10K U8 SC1302A 2 7 4 5 R68 1K U11 MOC207 1 2 6 5 R65 100K T5 PE68386 M17 Si4488DY C36 0.1uF R63 6.8 1u,100V C34 C37 0.1uF R81 4.7K R71 10K D19 1N5819HW R82 5.11K C38 0.1uF R60 1K D15 1N4148WS |
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