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PDF PWS745 Data sheet ( Hoja de datos )
| Número de pieza | PWS745 | |
| Descripción | Multi-Channel Isolated DC/DC CONVERTER COMPONENTS | |
| Fabricantes | Burr-Brown Corporation | |
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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
VIN
DRIVE
GATE
TTLIN
TTLOUT
GND
Oscillator
Driver
Soft Start
DRIVE
GATE
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.
T
COM1
COM2
T
PWS745-2 (15V Operation)
PWS745-4 (5V Operation)
TO AC
VD GND
TO AC
International Airport Industrial Park • Mailing Address: PO Box 11400 • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1990 Burr-Brown Corporation
PDS1-1095
PWS745Printed in U.S.A. March, 1992
®
1 page  
TYPICAL PERFORMANCE CURVES (CONT)
TA = 25°C, +15VDC or +5VDC unless otherwise specified.
LINE REGULATION USING PWS745-4 TRANSFORMERS
20
18
4 Channels
16
14
12
10
8
4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 6.1
VIN
20
18
16
14
12
10
8
6
4
2
0
0
OUTPUT RIPPLE VOLTAGE
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
C Load (µF)
1
DRIFT, PWS745
15.5
15
PWS745-2, 8 Channels
14.5
14
PWS745-4, 4 Channels
13.5
13
–25 –15 –5 5 15 25 35 45 55 65 75 85
Temperature (°C)
15.5
DRIFT, PWS740
15
14.5
PWS740-2, 8 Channels
14
13.5
13
–25 –15 –5 5 15 25 35 45 55 65 75 85
Temperature (°C)
PWS745-1 MAXIMUM INPUT POWER
12
10
8
6
4
2
0
–25 –15 –5 5 15 25 35 45 55 65 75 85
Temperature (°C)
TTLIN SIGNAL DUTY CYCLE
100
tH tL
75
Acceptable
DC = tH %
Duty
tH + tL
Cycle
50
25
0
1
Nominal
Operating
Frequency
1.5 2
Synchronization Frequency (MHz)
(= Twice the FET Drive Frequency)
2.5
®
5 PWS745
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet PWS745.PDF ] | |
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