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參數(shù)資料
| 型號： | ULQ-1.5/15-D48NM |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封裝： | 1.450 X 2.300 INCH, 0.350 INCH HEIGHT, QUARTER BRICK, SMT-8 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 566K |
| 代理商： | ULQ-1.5/15-D48NM |
8 - 2 5 A M P , S I N G L E O U T P U T D C / D C C O N V E R T E R S
ULQ Series
8
On/Off Control ("P" or "N" sufx)
The input-side, remote On/Off Control function (pin 2) can be ordered to
operate with either polarity:
"P" sufx: Standard models are equipped with Positive-polarity and these
devices are enabled when pin 2 is left open (or is pulled high, applying +3.5V
to +13 with respect to –Input, pin 1) as per Figure 8. Positive-polarity devices
are disabled when pin 2 is pulled low (0 to 0.8V with respect to –Input).
"N" sufx: Optional Negative-polarity devices are off when pin 2 is left open
(or pulled high, applying +3.5V to +13V), and on when pin 2 is pulled low (0 to
0.8V) with respect to –Input as shown in Figure 9.
2
1
3
+INPUT
+VCC
–INPUT
ON/OFF
CONTROL
2
1
3
+INPUT
13V CIRCUIT
5V CIRCUIT
–INPUT
ON/OFF
CONTROL
Figure 8. Driving the Positive Polarity On/Off Control Pin
Figure 9. Driving the Negative Polarity On/Off Control Pin
Surface-Mount Package ("M" sufx)
DATEL's ULQ series SMT DC/DC converters are the only higher-power (to
66W) DC/DC's that can be automatically "pick-and-placed" using standard
vacuum-pickup equipment and subsequently reowed using high-tempera-
ture, lead-free solder.
Virtually all SMT DC/DC's today are unprotected "open-frame" devices
assembled by their vendors with high-temperature solder (usually
Sn96.5/Ag3.5 with a melting point +221°C) so that you may attach them
to your board using low-temperature solder (usually Sn63/Pb37 with a melt-
ing point of +183°C). Conceptually straightforward, this "stepped" solder
approach has its limitations . . . and is clearly out of step with an industry
trending toward the broad use of lead-free solders. No need to experiment
and develop reow proles that ensure the components on their DC/DC never
exceed 215-216°C. If those components get too hot, "double-reow" could
compromise the reliability of their solder joints. Virtually all these devices
demand you "cool down" the Sn63 prole you are likely using today.
Dynamic control of the remote on/off function is best accomplished with
a mechanical relay or an open-collector/open-drain drive circuit (optically iso-
lated if appropriate). The drive circuit should be able to sink appropriate cur-
rent (see Performance Specications) when activated and withstand appro-
priate voltage when deactivated. Applying an external voltage to pin 2 when
no input power is applied to the converter can cause permanent damage
to the converter.
Figure 10. ULQ SMT DC/DC
With Disposable Heat Shield
Figure 11. Recommended Solder Prole
(When The Heat-shield Temperature Exceeds +250°C,The Air Within Is 50°C Cooler)
DATEL is not exempted from the Laws of Physics. And we do not have
magic solders no one else has. Nevertheless, we have a simple and practical,
straightforward approach that works. We assemble our SMT DC/DC's on a
hightemperature, plastic lead-frame (nylon 46, UL94V-0 rated) using a high-
temperature (+216°C), lead-free alloy (Sn96.2%, Ag2.5%, Cu0.8%, Sb0.5%).
The lead-frame ensures coplanarity (to within 0.004 in.) of the unit's tin-plated
(150 microinches) copper leads and also supports a removable heat shield.
The disposable heat shield, which has a cutaway exposing the package
leads, provides thermal insulation to internal components during reow and
also doubles as the vacuum pick-up location. The insulation properties of the
heat shield are so effective that temperature differentials as high as 50°C
develop inside-to-outside the shield. Oven temperature proles with peaks of
250-260°C and dwell times exceeding 2 minutes above 221°C (the melting
point of Sn96.5/Ag3.5) are easily achieved. DATEL's new-generation SMT
units are shipped in stackable, JEDEC-style plastic.
Z1
Z2
Z3
Z4
Z5
Z6
Z7
100
Seconds
De
gr
ee
s
Ce
ls
iu
s
250
200
150
100
50
200
300
400
500
600
Heat Shield
Test Board
Air Under Shield
相關PDF資料 |
PDF描述 |
|---|---|
| ULQ-1.8/25-D48NM | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| ULQ-2/25-D24P | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| ULQ-3.3/20-D24NL1 | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| UM-LR-PC | CONNECTOR ACCESSORY |
| UM-PR-PC | CONNECTOR ACCESSORY |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ULQ-2.5/15-D48N-C | 功能描述:DC/DC轉換器 37.5W 48Vto2.5V 15A NEGATIVE POLARITY RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| ULQ-2.5/15-D48NM-C | 功能描述:DC/DC轉換器 37.5W 48Vto2.5V 15A NEG SURFACE MOUNT RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| ULQ-2.5/15-D48P-C | 功能描述:DC/DC轉換器 37.5W 48Vto2.5V 15A POSITVE POLARITY RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| ULQ-2.5/15-D48PM-C | 功能描述:DC/DC轉換器 37.5W 48Vto2.5V 15A POS SURFACE MOUNT RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| ULQ-2.5/20-D24N-C | 功能描述:DC/DC轉換器 50W 24V to 2.5V 20A NEGATIVE POLARITY RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
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