參數(shù)資料
型號(hào)： PT4741
廠商： Texas Instruments, Inc.
英文描述： "70-W Quad-Output DC/DC converter for DSL
中文描述： 70W 四路輸出 48V 輸入的 DC/DC 轉(zhuǎn)換器，用于 DSL 線路驅(qū)動(dòng)器
文件頁(yè)數(shù)： 3/10頁(yè)
文件大小： 180K
代理商： PT4741
For technical support and more information, see inside back cover or visit www.ti.com
PT4741
—
48V
70-W Quad-Output
DC/DC Converter for DSL
PT4741 Electrical Specifications
(Unless otherwise stated, the operating conditions are:- T
a
=25°C, V
in
=48V, and I
o
=I
o
max)
PT4741
Typ
Characteristics
Symbols
Conditions
Min
Max
Units
Output Current
Io
1
, Io
2
Balanced load
±Vo
1
±Vo
2
±Vo
1
±Vo
2
±Vo
1
±Vo
2
0
0
—
—
—
—
36
—
7.76
3.82
—
—
—
—
7.6
3.75
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
8.0
3.94
±TBD
±TBD
±0.05
±0.2
—
—
86
—
—
75
2
±10
3
4
2.5
3.5
±100
(2)
±100
(2)
±200
±200
75
80
8.24
4.06
(3)
—
—
±0.25
±0.5
8.4
4.13
(3)
—
75
50
—
—
—
—
—
(1)
(1)
A
Load imbalance
mA
Transient imbalance (<1ms)
mA
Input Voltage Range
V
in
Continuous
Surge (1 minute)
Either output to COM
V
Set-Point Voltage
Vo
1
, Vo
2
±Vo
1
(8.0 V)
±Vo
2
(3.75V)
V
Temperature Variation
Reg
temp
–40°C
≤
T
a
≤
+85°C, I
o
=I
o
min
±Vo
1
±Vo
2
%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
(3.75V)
V
Efficiency
V
o
Ripple (pk-pk)
η
V
n
%
Measured from each output to COM,
0 to 20MHz bandwidth
0.1A/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 1ms)
Over V
in
and I
o
ranges
V
in
increasing
V
in
decreasing
Referenced to –V
in
(pin 2)
—
300
(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
2.4
—
—
—
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 3.94V. The output voltage and tolerance is defined as 3.75V, –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
.
SLTS167A - APRIL 2002 - REVISED NOVEMBER 2002
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