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參數(shù)資料
| 型號： | PT4842A |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 3-OUTPUT 62 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | SIP-21 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大?。?/td> | 260K |
| 代理商： | PT4842A |
For technical support and more information, see inside back cover or visit www.ti.com
PT4841—48V
65-W Triple Output Isolated DC/DC
Converter for DSL Applications
PT4841 Electrical Specifications
(Unless otherwise stated, the operating conditions are:- Ta =25°C, Vin =48V, and Ion =0.5Ionmax)
PT4841
Characteristics
Symbols
Conditions
Min
Typ
Max
Units
Output Power
Po
Each output:
Vo1 ( 15V)
—
41 (1)
Vo2 (3.3V)
—
20 (1)
W
Vo3 (1.5V)
—
10.5 (1)
Total (all three outputs)
—
65 (1)
W
Output Current
Io
Io1 ( 15V)
0
—
2.7
Io2 (3.3V)
0
—
6
(2)
A
Io3 (1.5V)
0
—
7
(2)
Maximum (Io2 + Io3)
——11
(2)
A
Input Voltage Range
Vin
36
—
75
V
Set-Point Voltage
Vo
Vo1
—
15.2
—
Vo2
—
3.3
—
V
Vo3
—1.5
—
Temperature Variation
Regtemp
–40°C
≤Ta ≤+85°C, Io =Iomin
Vo1
—
±0.5
—
%Vo
Vo2/Vo3
—
±0.8
—
Line Regulation
Regline
All outputs, Over Vin range
—
0.10.5
%Vo
Load Regulation
Regload
All outputs, 0
≤Io≤Iomax
—
0.2
0.5
%Vo
Cross Regulation
Regcross
Any one output vs. other outputs
—
1.0
%Vo
Total Output Voltage Variation
Votol
Includes set-point, line, load,
Vo1
15
—
15.75 (3)
–40°C
≤Ta ≤+85°C
Vo2
3.2
—
3.4
(3)
V
Vo3
1.45
—
1.55 (3)
Efficiency
η
Po =Pomax
—
85
—
%
Vo Ripple/Noise
Vn
Co1/Co2/Co3 =10F
Vo1
—50
100 (4)
(0 to 20MHz bandwidth)
Vo2
—20
50 (4)
mVpp
Vo3
—20
50 (4)
Transient Response
ttr
0.1A/s load step, 50% to 75% Iomax
—
30
—
Sec
Vos
Vo over/undershoot
—
5
—
%Vo
Output Adjust Range
Voadj
Vo2 / Vo3
±10
——%Vo
Current Limit Threshold
ILIM
Io1
—4
—
A
Io2 + Io3
—16
—
Over Current Shutdown Delay
tsd
Time period prior to latched shutdown
—
200 (5)
—ms
Switching Frequency
s
Over Vin and Io ranges
450
500
550
kHz
Under Voltage Lockout
Von
Vin increasing
—
34
—
V
Voff
Vin decreasing
—
32
—
Enable Control (pins 2 & 3)
Referenced to –Vin (pin 2)
High-Level Input Voltage
VIH
4.0
—
70 (6)
V
Low-Level Input Voltage
VIL
–0.2
—
0.8 (6)
Low-Level Input Current
IIL
Vin =75V
—
0.16
0.25
mA
Standby Input Current
Iin standby
pins 2 & 4 connected
—
8
10 (3)
mA
Internal Input Capacitance
Cint
—2
—F
External Output Capacitance
Co1
0
—
330
(7)
Co2
0
—
5,000 (7)
F
Co3
0
—
10,000 (7)
Temperature Sense
Vtemp
Output voltage at temperatures:-
–40°C
—
0.1 (8)
—
V
100°C
—
1.5 (8)
—
Primary/Secondary Isolation
V iso
1500
—
V
C iso
—1500
—pF
R iso
10
——M
Notes: (1) The sum total power delivered from all three regulated outputs, Vo1, Vo2, and Vo3, cannot exceed 65 watts.
(2) The sum-total current from outputs Vo2, and Vo3 cannot exceed 11ADC.
(3) Limits are guaranteed by design.
(4) The ripple and noise is measured with a 10F tantalum capacitor across each output.
(5) After latched shutdown, the module may be reset cycling the input power.
(6) The Enable inputs (pins 3 & 4) have internal pull-ups. Leaving pin 4 open-circuit and connecting pin 3 to –Vin allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 5.1V.
(7) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. For more information refer to the application
note regarding capacitor selection.
(8) Voltage output at “TEMP” pin is defined by the equation:- VTEMP = 0.5 + 0.01T, where T is the sensed temperature in degrees centigrade. See pin
descriptions for more information.
SLTS142C - DECEMBER 2000 -REVISED SEPTEMBER 2002
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