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FAN5092 数据表(PDF) 2 Page - Fairchild Semiconductor |
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FAN5092 数据表(HTML) 2 Page - Fairchild Semiconductor |
2 / 4 page AB-28 APPLICATION BULLETIN 2 7/18/02 Fig.4. Datacom AC Power Distribution With the advent of the converged systems, these separate approaches to power distribution will converge into new architectures but the bottom line is that at the board or back- plane level the usual voltages will need to be delivered, namely 12V and 5V, as well as 0.9V, 1.8V, 2.5V, 3.3V with more to come. The delivery of such low voltages starting from DC or AC power will be the focus of this document from here on. DC-DC conversion Fig. 5 shows the –48V to +Vout (+5, +12V etc.) with a forward converter architecture based on the ML4823 high frequency PWM controller: Fig. 5. –48V to +Vout Conversion Fig.6 shows the DC-DC conversion from 12V and 5V down to a slew of typical low voltages required by modern electronic loads. Fig. 6. DC-DC Conversion Diagram The conversion down to heavy loads is done with synchronous rectification switching regulators of single or multiphase interleaved type, while for lighter loads linear regulators can be utilized. AC-DC conversion Fig. 7 shows the conversion of AC power directly down to one of the DC voltages listed earlier, all low enough to be safely distributed on the motherboard. The AC line is rectified first by means of a full bridge diode rectifier that converts the alternate AC voltage into a continuous but still poorly regulated intermediate voltage. Next this voltage is converted down to a low voltage usable by the electronics on the motherboard by means of a “fly-back” converter (KA5x03xx family) with minimum number of external components. This conversion requires electrical isolation between the high input and the low output voltages: this is accomplished via the utilization of a transformer (T) in the forward conversion path and an opto-coupler in the feedback path. Fig .7. AC/DC Conversion Diagram DC/DC AC LINE AC UPS AC DC/AC Rectifier Battery Backup 12V DC -48V 120/208V AC UF4005 Lreset Rload MBR 3060PT MBR3060PT Lbias C1 C2 C3 +Vout L D1 D2 D3 T ML4823 H11A817A RC431A Rlim -48V -48V 2 Φ FAN5092 TSSOP28 FAN5236 Dual S024/28 LDO RC1587 LDO RC1585 D1 12V 5V C1 C1 T1 N:1 Vout1: 1-5V, 30A Vout2: 2.5V, 6A Vout3: 1.8V, 6A Vout4: 3.3V, 3A Vout5: 1.5V, 5A Rload C2 Vout 1N5822 Vstart FB GND GND Drain Vcc GND GND AC Line + – T H11A817A RC431A KA5H0365 MB6S |
类似零件编号 - FAN5092 |
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类似说明 - FAN5092 |
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