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參數(shù)資料
| 型號： | PT4741C |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 4-OUTPUT 70 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | SMD-26/19 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大?。?/td> | 321K |
| 代理商： | PT4741C |
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:- Ta =25°C, Vin =48V, and Io =Iomax)
PT4741
Characteristics
Symbols
Conditions
Min
Typ
Max
Units
Output Current
Io1, Io2
Balanced load
±Vo1
0
—
2.5 (1)
A
±Vo2
0
—
3.5 (1)
Load imbalance
±Vo1
—
±100 (2)
mA
±Vo2
—
±100 (2)
Transient imbalance (<1ms)
±Vo1
—
±200
mA
±Vo2
—
±200
Input Voltage Range
Vin
Continuous
36
—
75
V
Surge (1 minute)
—
80
Set-Point Voltage
Vo1, Vo2
Either output to COM
±Vo1 (8.0 V)
7.76
8.0
8.24
V
±Vo2 (3.75V)
3.82
3.94
4.06 (3)
Temperature Variation
Regtemp
–40°C
≤Ta ≤+85°C, Io =Iomin
±Vo1
—
±TBD
—
%Vo
±Vo2
—
±TBD
—
Line Regulation
Regline
All outputs, Over Vin range
—
±0.05
±0.25
%Vo
Load Regulation
Regload
All outputs, 0
≤Io≤Iomax
—
±0.2
±0.5
%Vo
Total Output Voltage Variation
Votot
Includes set-point, line, load,
±Vo1 (8.0 V)
7.6
—
8.4
V
–40°C
≤Ta≤+85°C
±Vo2 (3.75V)
3.75
—
4.13 (3)
Efficiency
η
—86
—
%
Vo Ripple (pk-pk)
Vn
Measured from each output to COM,
±Vo1
——75
mVpp
0 to 20MHz bandwidth
±Vo2
——50
Transient Response
ttr
0.1A/s load step, 50% to 75% Iomax
—
75
—
Sec
Vos
Vo over/undershoot
—
2
—
%Vo
Output Adjust Range
Vox adj
Each ±Vo adjusted as pair
—
±10
—
%Vo
Balanced Load
IoLIM
Shutdown, auto restart
±Vo1
—3
(1)
—
A
Current Limit Threshold
±Vo2
—4
(1)
—
Unbalanced Load
Iocomsc
Shutdown & latch off
—
300 (2)
—mA
Shutdown Threshold
(within 1ms)
Switching Frequency
s
Over Vin and Io ranges
550
600
650
kHz
Under Voltage Lockout
Von
Vin increasing
—
34
—
V
Voff
Vin decreasing
—
32
—
Enable Control (pins 3 & 4)
Referenced to –Vin (pin 2)
High-Level Input Voltage
VIH
4
—
Open (4)
V
Low-Level Input Voltage
VIL
–0.2
—
0.8
(4)
Low-Level Input Current
IIL
Pin connected to –Vin (pin 2)
—
–0.16
–0.27
mA
Standby Input Current
Iin standby
pins 3 & 4 open circuit
—
5
20
mA
Internal Input Capacitance
Cint
—
2.4
—
F
External Output Capacitance
Co
Each output to COM
±Vo1
33
—
1,000 (5)
F
±Vo2
150
—
1,000 (5)
Primary/Secondary Isolation
V iso
1500
—
V
C iso
—
2,200
—
pF
R iso
10
——M
Notes:
(1) A balanced load is defined as the current flowing out of (+Vox) being to equal that flowing into (–Vox). The current flowing in the COM termnal is zero.
(2) The load imbalance is the difference between the current flowing out of (+Vox) and flowing into (–Vox). The difference flows in the COM terminal.
(3) The nominal output voltage of ±Vo2 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 –Vin 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 (±Vox) must be divided equally between (+Vox) and (–Vox) with respect to the COM
termnial. E.g. Co1 must equal Co2, and Co3 must equal Co4.
SLTS167A - APRIL 2002 - REVISED NOVEMBER 2002
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