KA5H0365 Fairchild, KA5H0365 Datasheet
KA5H0365
Manufacturer Part Number
KA5H0365
Description
Power Conversion for the Data Communications Market
Manufacturer
Fairchild
Datasheet
1.KA5H0365.pdf
(4 pages)
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Abstract
This application bulletin discusses the transition from tradi-
tional telephony to converged voice and data over Internet
Protocol (IP) and its implications for the power conversion
of such systems. A few power conversion examples are pro-
vided complete of applications schematics.
Introduction
The arm wrestling between voice and data has concluded in
favor of the latter with all the major players now posturing
for leadership of the migration from traditional voice to
Internet Protocol (IP) telephony. On the short term the huge
investments in both traditional telephony infrastructure and
data over IP warrants that over the next few years we will
have to provide power conversion for both types of systems
as well as for the converged systems to come.
Current Environment with Separate
Networks
Fig. 1 shows the current situation with voice going through
traditional PBX (Private Branch Office), Central Office, and
Switch to the Public Switch Telephone Network (PSTN). On
independent paths the data travels from Routers to wide Area
Networks (WAN) and the video goes trough a third indepen-
dent path.
REV. 1.0.0
Application Bulletin AB-28
Power Conversion for the Data
Communications Market
Office PBX
(Private Branch
Exchange)
Phone/Fax
Fig.1. Separate Networks for Voice, Data and Video
Home
Router
Video
Central
Office
Voice
Video
Data
Switch
Public Switch
Telephone
Network (PSTN)
Wide Area
Network
(WAN)
Video
Migration to Converged Voice/
Data IP
Fig. 2 shows the envisioned converged Voice/Data/Video
system over IP. At the center of this new universe is the
Internet Protocol Wide Area Network, with all the services,
including voice, data, video and wireless communications
gravitating around it.
Telecom –48V DC Power Distribution
Traditionally telecom systems have been distributing a DC
power (-48V typically) obtained from a battery back up
being continually charged by a Rectifier/Charger from the
AC line. Subsequently the –48V is converted into various
low positive DC voltages (Fig. 3 shows 12V only for
simplicity) as well as back to AC voltages as necessary.
Datacom AC Power Distribution
Data centric systems tend to rely on an Uninterruptible
Power Supply (AC UPS) front-end for distributing AC
power, which subsequently is converted into the basic
constituents, -48V, AC power and low voltage DC (again,
for simplicity we are only showing a 12V DC in Fig. 4).
IPWAN = Internet Protocol Wide Area Network
WLAN = Wireless Local Area Network
PSTN = Public Switched Telephone Network
AC LINE
Router
Fig. 3. Telecom –48V DC power distribution
/Charger
Rectifier
Fig. 2. Voice/Data/video Over IP
Backup
Battery
-48V
IP WAN
WLAN
PSTN
www.fairchildsemi.com
DC/DC
DC/AC
120/208V AC
12V DC
Video
-48V
1
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KA5H0365 Summary of contents
Page 1
... Data centric systems tend to rely on an Uninterruptible Power Supply (AC UPS) front-end for distributing AC power, which subsequently is converted into the basic constituents, -48V, AC power and low voltage DC (again, for simplicity we are only showing a 12V DC in Fig. 4). www.fairchildsemi.com WLAN IP WAN Video PSTN -48V ...
Page 2
... MB6S – AC Line Fig .7. AC/DC Conversion Diagram APPLICATION BULLETIN Vout1: 1-5V, 30A 12V 2Φ FAN5092 TSSOP28 Vout2: 2.5V FAN5236 Dual S024/28 Vout3: 1.8V, 6A Vout4: 3.3V, 3A LDO RC1587 5V C1 Vout5: 1.5V, 5A LDO RC1585 1N5822 Vout T C2 Vstart Drain FB Vcc GND GND GND GND KA5H0365 RC431A H11A817A Rload 7/18/02 ...
Page 3
... The application diagram of the IC is shown in Fig 8 for a 3.3V, 30A load. Optimum companions of the FAN5092 are the Fairchild discrete DMOS FDB6035AL for high side pass transistors Q1,2 and FDB6676S for low side synchronous rectification transistors Q2,4. Two FAN5092 can be paralleled by means of doubling the above application and connecting together two pins (pin 26 and pin 15) ...
Page 4
... For more details and a complete bill of materials please refer VOUT1 to the FAN5092, FAN5236, RC1585, RC1587 and FOD2712 L OUT1 = 2.5V data sheets available on the Fairchild web site. C OUT1 Q2 For KA5H0365 please refer to the data sheet as well as to FPS Application Notes for SMPS design available on the Fairchild web site. Q3 VOUT2 L = 1.8V OUT2 Conclusion C ...