PWS745
Multi-Channel Isolated
DC/DC CONVERTER COMPONENTS
FEATURES
q
COMPACT SIZE
q
LOW COST PER CHANNEL
q
DRIVES UP TO 8 CHANNELS
q
750/1500VAC ISOLATION
q
FLEXIBLE USE WITH PWS740/PWS750
COMPONENTS
q
0.4 IN. MAXIMUM MOUNTING HEIGHT
APPLICATIONS
q
INDUSTRIAL CONTROL
q
GROUND-LOOP ELIMINATION
q
PC-BASED DATA ACQUISITION
q
POINT-OF-USE POWER CONVERSION
q
5V TO
±
15V FROM DIGITAL SUPPLIES
DESCRIPTION
The PWS745 is a set of components useful in the
construction of single or multi-channel isolated
DC/DC converters. By themselves, or in combination
with the PWS740 and PWS750 families of compo-
nents, they allow compact, optimal, and low-cost so-
lutions to many power supply problems.
The PWS745-1 DIP oscillator/driver can be used to
drive up to eight channels of independently isolated
power. The switching MOSFETs are built into the
driver to allow simple low-cost assembly of the multi-
channel converter. The PWS745-1 also is capable of
operating at 5VDC and can be easily synchronized
with TTL level signals. While offering the user an
alternative to the TO-3 package of the PWS740, the
PWS745-1
V
IN
DRIVE
GATE
T
TTL
IN
Oscillator
TTL
OUT
Driver
COM2
GND
Soft Start
DRIVE
GATE
• Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
®
PWS745-1 also allows the user to select varying levels
of power, isolation voltage, mounting technology and
system configuration by choosing among the several
component families. For example, the PWS745-1 can
directly drive the PWS740, PWS745, or PWS750
transformers. It also can drive the FETs of a PWS750
distributed power system. The operating frequency is
compatible with the ISO120 family of isolation ampli-
fiers and is capable of multi-channel synchronized
operation to eliminate troublesome beat frequencies.
The PWS745-2 is a 15V to
±15V
output version, while
the PWS745-4 is the 5V to
±15V
output version. The
PWS740-3 high-speed bridge provides a convenient
rectifier for the selected transformer output.
PWS745-2 (15V Operation)
PWS745-4 (5V Operation)
T
O
AC
COM1
V
D
GND
T
T
O
AC
International Airport Industrial Park • Mailing Address: PO Box 11400
Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP •
© 1990 Burr-Brown Corporation
PDS-1095
1
Printed in U.S.A. March, 1992
PWS745
SPECIFICATIONS
ELECTRICAL
At V
IN
= 15VDC, Output Load =
±15mA
(PWS745-2) and T
A
= 25°C unless otherwise noted.
Or V
IN
= 5VDC, Output Load =
±12mA
(PWS745-4) and T
A
= 25°C unless otherwise noted.
PARAMETER
PWS745-1 OSCILLATOR/DRIVER
Frequency: Internal OSC
External OSC
Supply: 15V Operation
5V Operation
Current
Current Ripple
TTL
IN
: I
IH
I
IL
V
IH
V
IL
Frequency
TTL
OUT
: I
OL
Frequency
T, T Drive Current
T, T Drive Voltage: High
Low
PWS745-2
Voltage, Rated Continuous AC 60Hz
100% Test
(1)
Barrier Impedance
Leakage Current at 60Hz
PWS745-4
Voltage, Rated Continuous AC 60Hz
100% Test
(1)
Barrier Impedance
Leakage Current at 60Hz
TEMPERATURE RANGE
Specification
Operation
Storage
–40
–40
–40
85
85
85
°C
°C
°C
60Hz, 1s
V
ISO
= 240Vrms, 60Hz
750
1200
10
12
|| 8
150
Vrms
Vrms
Ω
|| pF
µArms
60Hz, 1s
V
ISO
= 240Vrms, 60Hz
750
1200
10
12
|| 8
150
Vrms
Vrms
Ω
|| pF
µArms
TTL
IN
= 0V
550
500
10
4.5
600
600
15
5
10
650
2.5
–1
2
1
600
3
50
7
0.7
0.8
2
15
650
1000
18
5.5
kHz
kHz
V
V
mA
mA
mAp-p
nA
µA
V
V
MHz
mA
kHz
mA
V
V
CONDITIONS
MIN
TYP
MAX
UNITS
No Load
Max Load
C
BYPASS
= 1µF
10
NOTES: (1) Tested at 1.6 rated, fail on 5pc partial discharge leakage current on five successive pulses.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
®
PWS745
2
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ..................................................................................... 18V
Continuous Isolation Voltage ....................................................... 750Vrms
Junction Temperature ...................................................................... 150°C
Storage Temperature ......................................................................... 85°C
Lead Temperature (soldering, 10s) .................................................. 300°C
Transformer Output Short to Common .................................... Continuous
Max Load, Sum of All Transformer Outputs .................................... 500mA
Stresses above these ratings may permanently damage the device.
PIN CONFIGURATIONS
PWS745-1
1
2
3
4
COM1
T
T
GATE
DRIVE
GND
GND
+V
IN
COM2
T
T
GATE
DRIVE
TTL
IN
TTL
OUT
ENABLE
16
15
14
13
12
11
10
9
USA OEM PRICES
PACKAGE INFORMATION
(1)
MODEL
MODEL
PWS745-1
PWS745-2
PWS745-1
PWS745-4
PWS745-2
PWS745-4
1–24
PACKAGE
$13.10
6.40
16-Pin Plastic DIP
6.40
8-Pin Plastic
8-Pin Plastic
25–99
100+
PACKAGE DRAWING
NUMBER
$10.10
$7.75
4.95
129 3.80
4.95
250 3.80
250
5
6
7
8
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix D of Burr-Brown IC Data Book.
PWS745-2/PWS745-4
1
NC
AC
GND
AC
NC
T
O
V
D
T
O
8
7
6
5
ELECTROSTATIC
DISCHARGE SENSITIVITY
Electrostatic discharge can cause damage ranging from per-
formance degradation to complete device failure. Burr-
Brown Corporation recommends that all integrated circuits
be handled and stored using appropriate ESD protection
methods.
2
3
4
®
3
PWS745
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