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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC4261 датащи(PDF) 21 Page - Analog Devices |
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LTC4261 датащи(HTML) 21 Page - Analog Devices |
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21 / 74 page  LTC4283 21 Rev. B For more information www.analog.com APPLICATIONS INFORMATION Figure 2b. –48V/600W Dual-Feed Hot Swap Controller with LTC4283 (Part Two) M1A PSMN4R8-100BSE M1B PSMN4R8-100BSE RG1A 10 RG1B 10 RD 100k RDT 200k 1% RG1 470 CG1 100nF CL 500µF RDB 5.11k 1% QIN BCP56 RZ 100k CVCC 1µF R13 5.1k R14 5.1k R15 5.1k R16 5.1k R17 5.1k R18 5.1k Q5 HCPL-0300 Q6 6N139 R19 5.1k Q7 MOC207 Q10 6N139 R22 5.1k Q8 Q9 R20 0.51k R21 0.51k RL 343, 2.4k 28.7W, ×7 0805 MBRM5100 4283 F02b INTVCC GATE DRAIN VZ VIN SCL SDAI SDAO ALERT# PGIO4 LTC4283 DRNS A B VEE PGIO3 PGIO1 PGIO2 CASE VIN– VOUT– VOUT– VIN– VOUT+ VIN+ VOUT+ VIN+ FLTR100V10 FILTER MODULE CASE JW050A1-E POWER MODULE ON VDD GND RST LTC2900 VDD MICRO- CONTROLLER SCL SDA ALERT RST HCPL- 2630 DUAL 100V OV TRANSIENT RESERVOIR CAPACITOR VEE VEE VEE VEE VEE GND VEE VOUT VLOAD + – CIN 0.1µF CZ 0.1µF RTN –48V RZ 1M CZ 0.1µF CIN 0.1µF MIN IXTY08N100D2 VZ VIN LTC4283 4283 F03 VEE DEPLETION- MODE –48V CIN 0.1µF VZ VIN LTC4283 VEE VEE EXTERNAL 12V SUPPLY* VEE 4283 F04 *MUST COMPLY WITH MAXIMUM RATING OF VIN PIN The turn-on sequence continues by charging up GATE with 100μA current source. When the GATE voltage reaches the MOSFET threshold voltage, the MOSFET begins to turn on and the inrush current charges the load capacitor CL to ramp the MOSFET drain towards VEE in a controlled manner (see Inrush Control). When the MOSFET drain is ramped down to VEE or the output is ramped up to the supply voltage, GATE is pulled up to VIN and the MOSFET is fully enhanced. The GATE_HIGH bit in SYSTEM_STATUS register 0x00 is set when GATE is above VIN – 1.8V. Figure 5 illustrates the startup sequence of the LTC4283. During the power-on-reset delay of 1.3ms, the fault regis- ters are cleared and the control registers are loaded with the data held in the corresponding EEPROM registers. The power-on-reset can be detected using the PORB bit in register 0x0E, which will be cleared when INTVCC dips below 3.8V. Set this bit to 1 in normal operating condi- tions and keep monitoring this bit. A 0 from subsequent reading indicates a power-on-reset has occurred. Figure 3. The LTC4283 Can Operate to >300V Using a Depletion Mode N-Channel MOSFET Figure 4. Using an External 12V Supply |
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