參數(shù)資料
型號(hào)： PT4801C
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源模塊
英文描述： 3-OUTPUT 25 W DC-DC REG PWR SUPPLY MODULE
封裝： SIP-15
文件頁(yè)數(shù)： 2/9頁(yè)
文件大?。?/td> 183K
代理商： PT4801C
For technical support and more information, see inside back cover or visit www.ti.com
PT4801—48V
25-W Triple Output Isolated DC/DC
Converter for DSL Applications
Electrical Specifications (Unless otherwise stated, Ta =25°C, Vin =48V, Cin =0F, Cout =0F, and Io =Iotyp)
PT4801 SERIES
Characteristics
Symbols
Conditions
Min
Typ
Max
Units
Output Power
Po
Each output:
Vo1 ( 15V)—
15
18.75 (1)
Vo2 (3.3V)—
6.6
9.9
(1)
W
Vo3 (1.5V)—
2.25
3.0
(1)
All three outputs:
—
25
(1)
W
Output Current
Io
Vo1 ( 15V)0
1.0
1.25
A
(Io1 >0.25A)Vo2 (3.3V)0
2.0
3.0
(2)
A
Vo3 (1.5V)0
1.5
2.0
(2)
(Io1 ≤0.25A)Vo2 (3.3V)0
—
2.0
(2)
A
Vo3 (1.5V)0
—
1.5
(2)
Maximum (Io1 + Io2 + Io3)—
—
6.0
(3)
A
Input Voltage Range
Vin
Continuous
36
—
75
V
Surge (1 minute)—
—
80
V
Set-point Voltage Tolerance
Vo tol
Vo1
15.0
—
15.75
Vo2
3.25
3.3
3.35
V
Vo3
1.45
1.5
1.55
Temperature Variation
Regtemp
–40°
≤Ta ≤ +85°C, Io =Iomin
—
±0.5
—
%Vo
Line Regulation
Regline
All outputs, Over Vin range, Io =Iotyp
—
0.5
1.0
%Vo
Load Regulation
Regload
All outputs, Io =10% to 100%Iomax
—
0.5
1.0
%Vo
Total Output Voltage Variation
Votot
Includes set-point, line load,
Vo1
15.0
—
15.75
–40°C
≤Ta ≤ +85°C
Vo2
3.2
3.3
3.4
V
Vo3
1.4
1.5
1.6
Efficiency
η
Io1 =0.5A, Io2 =1.0A, Io3 =1.0A
—
78
—
%
Io1 =1.0A, Io2 =3.0A, Io3 =2.0A
—
81
—
Vo Ripple (pk-pk)Vr
20–20Mz bandwidth, Io =Iotyp
Vo1
—
75
150
Vo2
—
3350mVpp
Vo3
—30
50
Transient Response
ttr
25% load step from Io ≥0.5Iotyp
—
300
—
Sec
Vos
Vo over/undershoot
Vo1
—
35%Vo
Vo2
—
100
150
mVpp
Vo3
—
100
150
Output Voltage Adjust
Voadj
Vo2
3.135
—
3.465
V
Vo3
1.425
—
1.5
(4)
Switching Frequency
s
Over Vin and Io ranges
550
650
750
kHz
Under-Voltage Lockout
UVLO
Vin increasing
—
34
—
V
Vin decreasing
—
33
—
Remote On/Off (Pin x)Referenced to –Vin (pin 1)
Input High Voltage
VIH
2.5
—
15 (5)
V
Input Low Voltage
VIL
–0.2
—
+0.8
Input Low Current
IIL
—
–10
—
A
Standby Input Current
Iin standby
pins 1 & 2 connected
—
8
16
mA
Internal Input Capacitance
Cin
—
0.76
—
F
External Output Capacitance
Co1,Vo1
0
—
330 (6)
F
Co2, Co3
Vo2 & Vo3 (each)0
—
330 (6)
Isolation Voltage
Input–output/input–case
1500
—
V
Capacitance
Input to output
—
3000
—
pF
Resistance
Input to output
10
—
M
Operating Temperature Range
Ta
Over Vin Range
–40
—
+85 (7)
°C
Case Temperature
+100
°C
Over Temperature Protection
OTP
+125
°C
Storage Temperature
Ts
—
–40
—
+125
°C
Mechanical Shock
Method 2002.3
—
500
—
G’s
Mil-STD-883D,
1 msec, Sine, mounted
Mechanical Vibration
Method 2007.2,
Suffixes A, C
—
20 (8
—
G’s
Mil-STD-883D
20-2000 Hz, Soldered
Weight
—
Vertical/Horizontal
—
50
—
grams
Flammability
—
Meets UL 94V-O
Notes: (1) The sum-total power delivered from all three output, Vo1, Vo2, and Vo3 cannot exceed 25 watts.
(2) When the load current from Vo1 is less than 0.25A, the maximum current available from Vo2, and Vo3 is reduced to 2A and 1.5A respectively.
(3) The sum-total current from all three outputs Vo1, Vo2, and Vo3 cannot exceed 6Adc.
(4) Vo3 cannot be adjusted higher than the nominal output voltage. Consult the applicable application note for information on output voltage adjusment.
(5) The Remote On/Off input has an internal pull-up. If left open circuit the PT4801 will operate when input power is applied. A low-leakage (<100nA).
MOSFET is recommended to control this input. The open-circuit voltage is less than 10V. See application notes for interface considerations.
(6) External output capacitance is not required for proper operation. Up to 100F of external capacitance may be added to each output to improve the response
to load transients. Do not exceed 330F at any one output. Allowances must be made for load circuit capacitance and the total external capacitor tolerance.
Excessive output capacitance will affect converter start up. Low ESR capacitors, including Os-con and tantalum types, may be used.
(7) See Safe Operating Area curves, or consult the factory for the appriopriate derating.
(8) The case pins on the through-hole package types (suffixes A & N) must be soldered. For more information, see the applicable package outline drawing.
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