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参数资料
| 型号： | PWS750-3U |
| 英文描述： | Isolated, Unregulated DC/DC CONVERTER COMPONENTS |
| 中文描述： | 隔离，稳压直流/直流转换器元件 |
| 文件页数： | 7/11页 |
| 文件大小： | 151K |
| 代理商： | PWS750-3U |
PWS750
7
6
7
5
PWS750-2U
2
3
4
3
6
PWS750-3U
4
1
Output
Gnd
0.3μF
–V
O
+V
O
Duplicate for Up to 8 Channels
User Option
10μH
0.3μF
Input
Gnd
14
12
10
EN
TTL
IN
TTL
OUT
PWS750-1U
1
T
G
16
T
D
S
56
2N7002
3
7
11
V
D
IN
+V
+V
G
D
S
56
2N7002
G
D
S
2N7002
G
D
S
2N7002
0.3μF
0.3μF
PWS750-3U HIGH SPEED
DIODE BRIDGE PIN FUNCTIONS
The AC pins are tied directly to the AC pins of the PWS750-
2U. The +V and –V pins are rectified output voltages. The
filter capacitors must be located as close as possible to these
pins to minimize series inductance and therefore noise.
Bypass capacitors will be needed at each device in the
circuit.
BASIC OPERATION
SINGLE CHANNEL OPERATION,
PC BOARD LAYOUT CONSIDERATIONS
A simple two-layer board can be used on single channel
applications to create a DC/DC converter with low radiated
noise. A ground plane should be located directly under both
the input and the output components for optimum ground
return paths. The surface mount components make it easy to
design with a ground plane. The output filter capacitors
should be located as close to the PWS750-3U as possible. A
sample layout is shown in Figure 1.
For multiple channel applications, T and T traces must have
minimum capacitive loading. Therefore, there should be no
ground plane (or power plane) under these two traces. The
driver signal is a 4-6V low current 800kHz signal, which
will generate little radiated noise if the traces are kept short.
MULTIPLE CHANNEL OPERATION
The oscillator can drive up to four-channels (eight FETs)
directly when operating at 10-18V. A 10
resistor must be
placed in series with T and T to stabilize the FET gate
charging. For more than four-channel operation, or 5V-
multiple-channel operation, the driver circuit needs a FET
booster circuit, as shown in Figure 2. Large gate drive surge
currents (>100mA) are needed to turn on the gates.
If the total output current drawn by all the channels exceeds
250mA, then it will be necessary to circumvent the current
limit circuit by leaving the V
D
pin of the PWS750-1U open,
and connect the V
D
pin of the PWS750-2U directly to the
supply.
5V OPERATION
With 5V operation, the transformer winding current ratio is
3:1, therefore generating much greater currents in the pri-
mary. The input ripple voltage will be larger, so an input pi
filter will be necessary to isolate the converter noise from the
rest of the circuit. For example, when the output is
±
15mA
the input current will be at least 120mA.
MOSFET
MAX DRIVE CURRENT
PACKAGE
BREAKDOWN
TN0604
2N7002
2N7008
2N7010
2N7012
4A
TO-92
SO-T23
TO-92
TO-237
4-Pin DIP
40V
60V
60V
60V
60V
115mA
500mA
1.3A
1.2A
TABLE I. MOSFET Selector Guide.
FIGURE 2. MOSFET Driver Booster Circuits.
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相关代理商/技术参数 |
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|---|---|
| PWS750-4U | 制造商:BB 制造商全称:BB 功能描述:Isolated, Unregulated DC/DC CONVERTER COMPONENTS |
| PWS7702A230N4LG | 制造商:Hammond Manufacturing 功能描述:AIR/WATER HEAT EXCHANGER |
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| PWS-865-PQ | 制造商:Supermicro Computer Inc 功能描述:SUPERCHASSIS 制造商:Supermicro Computer Inc 功能描述:BPN,PWS,SNK,FAN - Trays |
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