參數(shù)資料
型號： PT4701
英文描述： 150V Single N-Channel HEXFET Power MOSFET in a SO-8 package; A IRF7451 with Standard Packaging
中文描述： 35鎢四路輸出。 48 - V輸入直流/直流轉換器的DSL線路驅動器
文件頁數(shù)： 3/13頁
文件大?。?/td> 345K
代理商： PT4701
For technical support and more information, see inside back cover or visit www.ti.com
PT4701
—
48V
35-W Quad-Output
DC/DC Converter for DSL
PT4701 Electrical Specifications
(Unless otherwise stated, the operating conditions are:- T
a
=25 °C, V
in
=48 V, and I
o
=I
o
max)
PT4701
Typ
Characteristics
Symbols
Conditions
Min
Max
Units
Output Current
Io
1
, Io
2
Balanced load
±Vo
1
(8.0 V)
±Vo
2
(3.75 V)
0
0
—
—
—
—
36
—
7.76
3.82
—
—
—
—
7.6
3.75
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
8.0
3.94
±0.5
±0.5
±0.05
±0.2
—
—
85
10
5
100
2
±10
1.5
2.5
1.25
(1)
1.75
(1)
±100
(2)
±100
(2)
±150
±150
75
80
8.24
4.06
(3)
—
—
±0.25
±0.5
8.4
4.13
(3)
—
—
—
—
—
—
—
—
A
Load imbalance
±Vo
1
±Vo
2
±Vo
1
±Vo
2
mA
Transient imbalance (<1 ms)
mA
Input Voltage Range
V
in
Continuous
Surge (1 minute)
Either output to COM
V
Set-Point Voltage
Vo
1
, Vo
2
±Vo
1
±Vo
2
±Vo
1
±Vo
2
V
Temperature Variation
Reg
temp
–40 °C
≤
T
a
≤
+85 °C, I
o
=I
o
min
%V
o
Line Regulation
Load Regulation
Total Output Voltage Variation
Reg
line
Reg
load
V
o
tot
All outputs, Over V
in
range
All outputs, 0
≤
I
o
≤
I
o
max
Includes set-point, line, load,
–40 °C
≤
T
a
≤
+85 °C
%V
o
%V
o
±Vo
1
(8.0 V)
±Vo
2
(3.75 V)
V
Efficiency
V
o
Ripple (pk-pk)
η
V
n
%
Measured from each output to COM,
0 to 20 MHz bandwidth
0.1 A/μs load step, 50 % to 75 % I
o
max
V
o
over/undershoot
Each ±V
o
adjusted as pair
Shutdown, auto restart
±Vo
1
±Vo
2
mV
pp
Transient Response
t
tr
V
os
Vo
x
adj
Io
LIM
μSec
%V
o
%V
o
Output Adjust Range
Balanced Load
Current Limit Threshold
Unbalanced Load
Shutdown Threshold
Switching Frequency
Under Voltage Lockout
±Vo
1
±Vo
2
(1)
(1)
A
I
o
com
sc
Shutdown & latch off
(within 1 ms)
Over V
in
and I
o
ranges
V
in
increasing
V
in
decreasing
Referenced to –V
in
(pin 2)
—
200
(2)
—
mA
s
V
on
V
off
550
—
—
600
34
32
650
—
—
kHz
V
Enable Control (pins 3 & 4)
High-Level Input Voltage
Low-Level Input Voltage
Low-Level Input Current
V
IH
V
IL
I
IL
I
in
standby
C
int
C
o
4
–0.2
—
—
—
33
150
1500
—
10
—
—
–0.16
5
1
—
—
—
2,200
—
Open
(4)
0.8
–0.27
20
—
1,000
(5)
1,000
(5)
—
—
—
V
(4)
Pin connected to –V
in
(pin 2)
pins 3 & 4 open circuit
mA
mA
μF
Standby Input Current
Internal Input Capacitance
External Output Capacitance
Each output to COM
±Vo
1
±Vo
2
μF
Primary/Secondary Isolation
V
iso
C
iso
R
iso
V
pF
M
Notes:
(1) A balanced load is defined as the current flowing out of (+Vo
) being to equal that flowing into (–Vo
x
). The current flowing in the COM termnal is zero.
(2) The load imbalance is the difference between the current flowing out of (+Vo
x
) and flowing into (–Vo
x
). The difference flows in the COM terminal.
(3) The nominal output voltage of ±Vo
is 3.94 V. The output voltage and tolerance is defined as 3.75 V, –0%, +10%.
(4) The Enable inputs (pins 3 & 4) have internal pull-ups. Leaving pin 3 open-circuit and connecting pin 4 to –V
in
allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 5V.
(5) Capacitance added to each pair of complimentary output voltages (±Vo
x
) must be divided equally between (+Vo
x
) and (–Vo
x
) with respect to the COM
termnial. E.g. Co
1
must equal Co
2
, and Co
3
must equal Co
4
.
SLTS182A - FEBRUARY 2003 - REVISED APRIL 2003
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