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參數(shù)資料
| 型號(hào)： | PWS745 |
| 英文描述： | 272 POS 1.27MM PITCH BGA SOCKET |
| 中文描述： | 多通道隔離DC / DC變換器元件 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 83K |
| 代理商： | PWS745 |
8
PWS745
5V OPERATION
With 5V operation, the transformer winding ratio is 3-to-1,
generating much greater currents in the primary. Therefore,
four channels are the maximum that can be powered directly
by the PWS745-1.
OUTPUT CURRENT RATING
The PWS745-1 driver contains “soft start” driver circuitry to
protect the driver MOSFETs and eliminate high in-rush
currents during turn-on. Impedance limiting by the isolation
transformers provides short circuit protection on the second-
ary side and limits the primary side current to a safe value.
The total current which can be drawn from each isolation
channel at rated voltage is a function of total power being
drawn from both V+ and V– outputs. For example, if one
output is not used, then maximum current can be drawn from
the other output. In all cases, the maximum total current that
can be drawn from any individual channel is:
|I
L
+| + |I
L
–| < 60mA
It should be noted that many analog circuit functions do not
simultaneously draw full rated current from both the positive
and negative supplies. Thus the PWS745 system can power
more circuits per channel than is first apparent. For example,
if a circuit draws 10mA from the positive supply and 3mA
from the negative supply, the PWS745 could power (60/13),
or about four devices per channel.
HIGH VOLTAGE TESTING
Burr Brown Corporation has adopted a partial discharge test
criterion that conforms to the German VDE0884 optocoupler
standard. This method requires that less than 5pc partial
discharge crosses the isolation barrier with 1200Vrms 60Hz
applied. This criterion confirms transient overvoltage (1.6 x
750Vrms) protection without damage to the PWS745-2 or
PWS745-4. Life test results verify the absence of high
voltage breakdown under continuous rated voltage and maxi-
mum temperature. The minimum AC voltage that initiates
partial discharge above 5pc is defined as the “inception
voltage.” Decreasing the barrier voltage to a lower level is
required before partial discharge ceases and is known as
“extinction voltage.” We have developed a package insula-
tion system to yield an inception voltage greater than
1200Vrms so that transient voltages below this level will not
damage the isolation barrier. The extinction voltage is above
750Vrms so that even overvoltage induced partial discharge
will cease once the barrier is reduced to the rated value.
Previous high voltage test methods relied on applying a
large enough overvoltage (above rated) to break down mar-
ginal units, but not so high as to permanently damage good
ones. Our partial discharge testing gives us more confidence
in barrier reliability than breakdown criteria.
TTL
6, 7
8
12
13
IN
4
5
0.3μF
3
6
0.3μF
T
T
PWS750-4U
(1)
PWS750-3U
(1)
0.3μF
V
IN
10μH
NOTE: (1) Substitute other PWS components
as appropriate for V or mounting technology.
PWS745-1
5V
11
16
1
2, 3
15, 14
3
6
PWS750-3U
(1)
PWS750-4U
(1)
0.3μF
0.3μF
Power for
input signal
conditioning
circuitry
0.3μF
1
4
Power for
output
circuitry
1
4
0.3μF
1
2
16
9
10
8
7
15
V
OUT
±10V
V
IN
±10V
I
Daughter
board
Mother
board
4
5
3
6
2
7
4
5
3
6
2
7
FIGURE 2. Complete
±
10V Signal Acquisition System Operating from a Single 5V Supply.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PWS745A/PWS726A/PWS740 WAF | 制造商:Texas Instruments 功能描述: |
| PWS745A/PWS726A/PWS741 WAF | 制造商:Texas Instruments 功能描述: |
| PWS745A/PWS726A/PWS742 WAF | 制造商:Texas Instruments 功能描述: |
| PWS745A/PWS726A/PWS743 WAF | 制造商:Texas Instruments 功能描述: |
| PWS745A/PWS726A/PWS744 WAF | 制造商:Texas Instruments 功能描述: |
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