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參數(shù)資料
| 型號： | RC1587 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Power Conversion for the Data Communications Market |
| 中文描述： | 電源轉換為數(shù)據(jù)通信市場 |
| 文件頁數(shù)： | 2/4頁 |
| 文件大?。?/td> | 333K |
| 代理商： | RC1587 |
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
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