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LTC4261 Datasheet(PDF) 21 Page - Analog Devices |
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LTC4261 Datasheet(HTML) 21 Page - Analog Devices |
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21 / 82 page  LTC4284 21 Rev. B For more information www.analog.com APPLICATIONS INFORMATION Figure 2b. –48V/1200W Dual-Feed Hot Swap Controller with LTC4284 in Parallel Mode (Part Two) M2A PSMN4R8-100BSE M2B PSMN4R8-100BSE M1A PSMN4R8-100BSE M1B PSMN4R8-100BSE RG1A 10 RG2 470 RG1B 10 RG2A 10 RG2B 10 RD 100k RDT 200k 1% CG1 100nF RG2 470 CG2 100nF CL 1000µF 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 7 × 2.4k, 0805 EACH 28.7W MBRM5100 4284 F02b INTVCC GATE1 GATE2 DRAIN VZ VIN SCL SDAI SDAO ALERT# PGIO4 LTC4284 DRNS A B C 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 RESEVOIR CAPACITOR VEE 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 LTC4284 4284 F03 VEE DEPLETION- MODE –48V CIN 0.1µF VZ VIN LTC4284 VEE VEE EXTERNAL 12V SUPPLY* VEE 4284 F04 *MUST COMPLY WITH MAXIMUM RATING OF VIN PIN on (without additional delay) when the ON bit is set to 1 through the I2C interface. When all turn-on conditions are satisfied, the FET_ON_STATUS bit in SYSTEM_STATUS register 0x00 is set to 1, indicating the MOSFETs are com- manded on. The turn-on sequence continues by charging up the GATEs with 50μA current sources. When the GATE volt- age 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 out- put is ramped up to the supply voltage, the GATEs are pulled up to VIN and the MOSFETs are fully enhanced. The GATE1_HIGH and GATE2_HIGH bits in SYSTEM_STATUS register 0x00 are set when GATE1 and GATE2 are above VIN – 1.8V. Figure 5 illustrates the startup sequence of the LTC4284 in parallel mode. Figure 3. The LTC4284 Can Operate to >300V Using a Depletion Mode N-Channel MOSFET Figure 4. Using an External 12V Supply |
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