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參數(shù)資料
| 型號： | PT4856N |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 3-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封裝： | SIP-26/25 |
| 文件頁數(shù)： | 13/15頁 |
| 文件大?。?/td> | 268K |
| 代理商： | PT4856N |
For technical support and more information, see inside back cover or visit www.ti.com
PT4856
25-A Triple Output Isolated DC/DC
Converter For Logic Applications
SLTS166C - FEBRUARY 2002 - REVISED MARCH 2003
PT4856 Electrical Specifications
(Unless otherwise stated, the operating conditions are:- Ta =25°C, Vin =48V, and Io =0.5Iomax)
PT4856 (Only)
Characteristics
Symbols
Conditions
Min
Typ
Max
Units
Output Current
Io
Each output
Io1
0—
10
Io2
0—
10
A
Io3
0—
10
Iotot
Total (all three outputs)
—
25
A
Input Voltage Range
Vin
Continuous
36
—
75
V
Surge (1 minute)
—
80
Set-Point Voltage Tolerance
Votol
—
1.5
%Vo
Temperature Variation
Regtemp
–40°C
≤Ta ≤+85°C, Io1 =Io2 =Io3 =Iomin
—
±0.5
—
%Vo
Line Regulation
Regline
All outputs, Over Vin range
—
±0.2
±0.5
%Vo
Load Regulation
Regload
Each output, 0
≤Io≤Iomax
—
±5
±10
mV
Cross Regulation
Regcross
Any output vs. another
—
±10
mV
Total Output Voltage Variation
Votol
Includes set-point, line, load,
—±2
±3
(1)
%Vo
–40°C
≤Ta ≤+85°C
Efficiency
η
Io1 =7A, Io2 =5A, Io3 =5A
—
88
—
%
Vo Ripple (pk-pk)
Vr
20MHz bandwidth,
Vo=5.0V
—
50
75
Io1 =Io2 =Io3 =5A
Vo=3.3V
—
20
50
mVpp
Vo=1.5V
—
15
25
Transient Response
ttr
0.1A/s load step, 50% to 75% Iomax
—
200
—
Sec
Vos
Vo over/undershoot
—
5
—
%Vo
Output Adjust Range
Voadj
Vo1/Vo2/Vo3
—
±10
—
%Vo
Current Limit Threshold
ILIM
Vo = –1%
Vo1
—20
—
Vo2
—15
—
A
Vo3
—15
—
Output Over-Voltage Protection
OVP
All outputs; module shutdown and latch off
—
125 (2)
—%Vo
Switching Frequency
s
Over Vin and Io ranges
280
320
340
kHz
Under Voltage Lockout
Von
Vin increasing
—
34
36
V
Voff
Vin decreasing
30
32
—
Enable Control (pins 3 & 4)
Referenced to –Vin (pin 2)
High-Level Input Voltage
VIH
3.5
—
Open (3)
V
Low-Level Input Voltage
VIL
–0.2
—
0.8 (3)
Low-Level Input Current
IIL
—
0.5
—
mA
Standby Input Current
Iin standby
pins 3 & 4 open circuit
—
2.5
4 (1)
mA
Internal Input Capacitance
Cint
—2
—F
External Output Capacitance
Cout
Per each output
0
—
5,000
F
Primary/Secondary Isolation
V iso
1500
—
V
C iso
—
2,200
—
pF
R iso
10
——M
Temperature Sense
Vtemp
Output voltage at temperatures:-–40°C
—
0.1 (4)
—
V
100°C
—
1.5 (4)
—
Notes: (1) Limits are specified by design.
(2) This is a fixed parameter. Adjusting Vo1 or Vo2 higher will increase the module’s sensitivity to over-voltage detection. For more information, see the
application note on output voltage adjustment.
(3) The Enable inputs (pins 3 & 4) have internal pull-ups. Leaving pin 4 open-circuit and connecting pin 3 to –Vin (pin 2) allows the the converter to
operate when input power is applied. The maximum open-circuit voltage for the Enable inputs is 5.4V.
(4) Voltage output at “TEMP” pin is defined by the equation:- VTEMP = 0.5 + 0.01T, where T is in °C. See pin descriptions for more information.
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