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參數(shù)資料
| 型號(hào)： | PT4826C |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 3-OUTPUT 35 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | METAL, SIP-21/18 |
| 文件頁(yè)數(shù)： | 14/34頁(yè) |
| 文件大?。?/td> | 483K |
| 代理商： | PT4826C |
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For technical support and more information, see inside back cover or visit www.ti.com
21
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4831—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4831 Electrical Specifications
(Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5Iomax)
PT4831
Characteristics
Symbols
Conditions
Min
Typ
Max
Units
Output Current
Io
Each output
Io1 (5.0V)
0.25 (1)
—
5.0 (2)
Io2 (3.3V)
0.1
(1)
—
5.5 (2)
A
Io3 (1.5V)
0.1
(1)
—
5.5 (2)
Total (Io1 + Io2 + Io3)
——9
(2)
A
Input Voltage Range
Vin
Continuous
36
—
75
V
Surge (1 minute)
—
80
Set-Point Voltage
Vo
Vo1
4.9
5.0
5.1
Vo2
3.24
3.3
3.36
V
Vo3
1.47
1.5
1.53
Temperature Variation
Regtemp
–40°C
≤Ta ≤+85°C, Io =Iomin
Vo1
—
±0.5
—
%Vo
Vo2/Vo3
—
±0.5
—
Line Regulation
Regline
All outputs, Over Vin range
—
±0.1
±0.5
%Vo
Load Regulation
Regload
All outputs, 0
≤Io≤Iomax
—
±0.1
±0.5
%Vo
Total Output Voltage Variation
Votol
Includes set-point, line, load,
Vo1
—
±3 (3)
%Vo
–40°C
≤Ta ≤+85°C
Vo2/Vo3
—
±3 (3)
Efficiency
η
Io1 =5A, Io2 =2A, Io3 =2A
—
87
—
%
Vo Ripple/Noise
Vn
Vo1
—40
—
(0 to 20MHz bandwidth)
Vo2
—35
—
mVpp
Vo3
—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
Over-Current Threshold
ITRIP
Total, all outputs. Reset with auto-recovery
—
11
—
A
Switching Frequency
s
Over Vin and Io ranges
350
400
450
kHz
Under Voltage Lockout
Von
Vin increasing
—
35.5
—
V
Voff
Vin decreasing
—
34
—
Turn-On Time
ton
Vin =48V step
—
140 (4)
—ms
Enable Control (pins 1 & 2)
Referenced to –Vin (pin 4)
High-Level Input Voltage
VIH
4
—
15 (5)
V
Low-Level Input Voltage
VIL
–0.2
—
0.8
Low-Level Input Current
IIL
—
12mA
Standby Input Current
Iin standby
pins 1 & 2 open circuit
—
1
5
mA
Internal Input Capacitance
Cint
—
1.14
—
F
External Output Capacitance
Co1
0
220
1,000 (6)
Co2
0
220
1,000 (6)
F
Co3
0
220
1,000 (6)
Primary/Secondary Isolation
V iso
1500
—
V
C iso
—
2,200
—
pF
R iso
10
——M
Notes: (1) The converter will operate down to no load with reduced specifications.
(2) The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 9ADC.
(3) Limits are specified by design.
(4) Measured from the application of the input voltage to the instance that all outputs are in regulation.
(5) The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –Vin allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
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