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PWS740 Datasheet

  • PWS740

  • Distributed Multi-Channel Isolated DC-TO-DC CONVERTER

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廬
PW
S74
0
PWS740
Distributed Multi-Channel Isolated
DC-TO-DC CONVERTER
FEATURES
ISOLATED
鹵
7 TO
鹵
20VDC OUTPUTS
BARRIER 100% TESTED AT 1500VAC, 60Hz
LOWEST POSSIBLE COST PER CHANNEL
MINIMUM PC BOARD SPACE
80% EFFICIENCY (8 CHANNELS, RATED
LOADS)
q
FLEXIBLE USE WITH PWS745
COMPONENTS
q
q
q
q
q
APPLICATIONS
q
INDUSTRIAL MEASUREMENT AND
CONTROL
q
DATA ACQUISITION SYSTEMS
q
TEST EQUIPMENT
The PWS740-1 is a high-frequency (400kHz nominal)
oscillator/driver, handling up to eight channels. This
part is a hybrid containing an oscillator and two power
FETs. It is supplied in a TO-3 case to provide the
power dissipation necessary at full load. Transformer
impedance limits the maximum input current to about
700mA at 15V input, well within the unit鈥檚 thermal
limits. A TTL-compatible ENABLE pin provides out-
put shut-down if desired. A SYNC pin allows syn-
chronization of several PWS740-1s.
The PWS740-2 is a trifilar-wound isolation trans-
former using a ferrite core and is encapsulated in a
plastic package, allowing a higher isolation voltage
rating. One PWS740-2 is used per isolated channel.
鈥揤
O
Gnd1 +V
O
鈥揤
O
Gnd1 +V
O
DESCRIPTION
The PWS740 is a multichannel, isolated DC-to-DC
converter with a 1500VAC continuous isolation rat-
ing. The outputs track the input voltage to the con-
verter over the range of 7 to 20VDC. The converter鈥檚
modular design, comprising three components, mini-
mizes the cost of isolated multichannel power for the
user.
Functional Diagram
10碌H
0.3碌F
10碌H
0.3碌F
10碌H
0.3碌F
10碌H
0.3碌F
BAV99
BAV99
BAV99
BAV99
V+
1
2
3
PWS740-2
1
2
3
PWS740-1
*7
*2
Freq
Adj
*1
8
4
10碌F
5
6
5
4
6
5
4
T
O
20碌H
V
DRIVE
0.3碌F
0.3碌F
T
O
Oscillator/
Driver
Up to
6 More
Channels
6
3
* Optional features; if unused, leave open.
** User Option
International Airport Industrial Park 鈥?Mailing Address: PO Box 11400, Tucson, AZ 85734 鈥?Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 鈥?Tel: (520) 746-1111 鈥?Twx: 910-952-1111
Internet: http://www.burr-brown.com/ 鈥?FAXLine: (800) 548-6133 (US/Canada Only) 鈥?Cable: BBRCORP 鈥?Telex: 066-6491 鈥?FAX: (520) 889-1510 鈥?Immediate Product Info: (800) 548-6132
廬
漏 1987 Burr-Brown Corporation
PDS-758H
1
Printed in U.S.A. January, 1998
PWS740

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