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PWS740 데이터시트 PDF




Burr-Brown Corporation에서 제조한 전자 부품 PWS740은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 PWS740 기능
기능 Distributed Multi-Channel Isolated DC-TO-DC CONVERTER
제조업체 Burr-Brown Corporation
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PWS740 데이터시트, 핀배열, 회로
® PWS740
PWS740
Distributed Multi-Channel Isolated
DC-TO-DC CONVERTER
FEATURES
q ISOLATED ±7 TO ±20VDC OUTPUTS
q BARRIER 100% TESTED AT 1500VAC, 60Hz
q LOWEST POSSIBLE COST PER CHANNEL
q MINIMUM PC BOARD SPACE
q 80% EFFICIENCY (8 CHANNELS, RATED
LOADS)
q FLEXIBLE USE WITH PWS745
COMPONENTS
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’s
modular design, comprising three components, mini-
mizes the cost of isolated multichannel power for the
user.
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’s 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.
–VO Gnd1 +VO
–VO Gnd1 +VO
Functional Diagram
10µH
0.3µF
10µH
0.3µF
10µH
0.3µF
10µH
0.3µF
BAV99
BAV99
BAV99
BAV99
V+ 1 2 3
1 23
Freq
Adj
PWS740-1 8
*7
*2 Oscillator/
Driver
*1
3
PWS740-2
4
10µF
5
6
65
20µH
0.3µF
4
65 4
0.3µF
* Optional features; if unused, leave open.
** User Option
TO
Up to
VDRIVE 6 More
Channels
TO
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
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1987 Burr-Brown Corporation
PDS-1758H
PWS740Printed in U.S.A. January, 1998
®




PWS740 pdf, 반도체, 판매, 대치품
TYPICAL PERFORMANCE CURVES
25
20
15
10
5
0
0
VRIPPLE vs CLOAD
VIN = 15V
IO = ±15mA/Channel
0.2 0.4 0.6 0.8 1.0
CLOAD (µF)
25
20
15
10
5
0
0
LINE REGULATION
1 THROUGH 8 CHANNELS
±IO = ±15mA/Channel
1 channel
4 or 8 channels
5 10 15 20 25
VIN (V)
EFFICIENCY vs LOAD 1,4, AND 8 CHANNELS
100
80 8 Channels
60
4 Channels
40
20
0
0
1 Channel
VIN = +15V
5 10 15 20 25 30
±IOUT (mA)
OUTPUT VOLTAGE DRIFT
0
–5
–10
–25
0 +25 +50
Temperature (°C)
+85
LOAD REGULATION 1, 4 AND 8 CHANNELS
20
1 Channel
15
4 and 8 Channel
10
5
0
VIN = 15V
5 10 15 20 25 30
±IOUT (mA)
500
400
300
200
100
0
1
FREQUENCY ADJUSTMENT RANGE
See Functional Diagram
10 100 1k 10k
Frequency Adjustment Resistor ()
100k
®
PWS740
4

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PWS740 전자부품, 판매, 대치품
BAV99
+15V(1)
–15V(1)
Gnd1
PWS740-2
16
0.3µF 2
5
BAV99
10µH(2)
34
0.3µF
0.1µF
24
1
0.1µF
4
VDRIVE
20µH
+
10µF
4 TO +VIN 8
0.3µF
PWS740-1
6 TO
3
5
Switch Power to
Other 7 Channels
12
2 Isolation
VIN1 Amplifier
ISO102(3)
14
16
10
5
6
13
–15V
22
Input
From
Other 7
Channels
7
12
11
10
9
21
Offset
NOTES: (1) Supplies ±15mA of isolated supply current per channel.
(2) WestCap DKM-10 or equivalent. (3) Or ISO120 or ISO122.
13
4
1
MPC8S
Multiplexer
8
AO
16 AO
VOUT
3
–15V
14
0.3µF
+15V
System Uses:
1 Oscillator/Driver
8 Transformers
8 Bridges
8 ISO102s
1 Multiplexer
Not all components are shown.
GND
FIGURE 3. Low Cost Eight-Channel Isolation Amplifier Block with Channel-to-Channel Isolation.
Critical consideration should go to minimizing electromag-
netic radiation from the switching signal’s lines. TO and TO.
You can identify the path of the switching current by starting
at the +VIN pin. The dynamic component of the current is
supplied primarily from the bypass capacitor. The high
frequency current flows through the inductor and down the
VDRIVE line, through one side of the transformer windings,
returning in the TO with the “on” FET switch, and then back
up through the bypass capacitor. This current path defines a
loop antenna which transmits magnetic energy. The mag-
netic field lines reinforce at the center of the loop, while the
field lines reinforce at the center of the loop, while the field
lines from opposite points of the loop oppose each other
outside the loop. Cancellation of magnetic radiation occurs
when the loop is collapsed to two tightly spaced parallel line
segments, each carrying the same current in opposite direc-
tions. For this reason, the printed circuit traces for both TO
connections should lay directly over a power plane forming
the VDRIVE connection. This plane need not extend much
wider than TO and TO. All of the current in the plane will
flow directly under the TO traces because this is the path of
least inductance (and least radiation).
Another potential problem with the TO lines is electric field
radiation. Fortunately, the VDRIVE plane is effective at termi-
nating most of the field lines because of its proximity to
these lines. Additional shielding can be obtained by running
ground trace(s) along the TO lines, which also facilitate
minimum loop area connections for the transformer’s center
tap bypass capacitors.
The connections between the secondary (output side) of the
transformer and the diode bridges should be kept as short as
possible. Unnecessary stray capacitance on these lines could
cause tuned circuit peaking to occur, resulting in a slight
increase of output voltage.
The PWS740 is intended for use with the ISO102, ISO120
or ISO122 isolation amplifiers (see Figure 3). Place the
PWS740-2 transformer on the VOUT side of the buffer rather
than on the C1 (bandwidth control) side to prevent possible
pickup of switch signal by the ISO102.
The best ground connection ties the ISO102 output analog
common pin to the PWS740-1 ground pin with a ground
plane. This is where a four-layer board design becomes
convenient. The digital ground of the ISO102 can be con-
nected to the ground plane or closer to the +V supply. If
possible, you should include the analog components that the
ISO102 drives on the same board. For example, if several
ISO102s are multiplexed to an analog/digital converter, then
having all components sharing the same ground plane will
significantly simplify ground errors. Avoid connecting
®
7 PWS740

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부품번호상세설명 및 기능제조사
PWS740

Distributed Multi-Channel Isolated DC-TO-DC CONVERTER

Burr-Brown Corporation
Burr-Brown Corporation
PWS745

Multi-Channel Isolated DC/DC CONVERTER COMPONENTS

Burr-Brown Corporation
Burr-Brown Corporation

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