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PTB48500 Datasheet(PDF) 5 Page - Texas Instruments

Part No. PTB48500
Description  Dual-Output, 48-V Input Isolated DC/DC Converter for xDSL
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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PTB48500 Datasheet(HTML) 5 Page - Texas Instruments

 
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PTB48501
Dual-Output, 48-V Input Isolated
DC/DC Converter for xDSL
Specifications (Unless otherwise stated, TA =25°C, VI =48 V, CI =0 µF, CO =0 µF, and Io =50% IO max)
PTB48501A
Characteristic
Symbol
Conditions
Min
Typ
Max
Units
Output Power
Po1, Po2
Vo1 (3.3 V)
19.8
W
Vo2 (1.2 V)
12.6
Po total
Both outputs
32.4
W
Output Current
Io1, Io2
Over VI range
Vo1 (3.3 V)
0
6 (1)
A
Vo2 (1.2 V)
0
10.5 (1)
Io1 + Io2
Total (both outputs)
0
16.5
A
Output Voltage
Vo1
Inlcudes set point, line, load,
3.2
3.3
3.4
V
Vo2
–40
≤ TA ≤ +85°C
1.16
1.2
1.24
Temperature Variation
∆Regtemp
–40°
≤TA≤ +85°C, IO =IO min
Vo1
±0.5
%Vo
Vo2
±0.8
Line Regulation
∆Regline
Over VI range
Vo1, Vo2
±1
±10
mV
Load Regulation
∆Regload
Over Io range
Vo1, Vo2
±3
±12
mV
Cross Regulation
∆Regcross
IO min ≤ Io2 ≤ Iomax, Io1 =1 A
∆Vo1
——10
mV
IO min ≤ Io1 ≤ Iomax, Io2 =1 A
∆Vo2
——10
Efficiency
η
Io1, Io2 =Iomax
81
%
Vo Ripple (pk-pk)
Vr
20 MHz bandwidth
Vo1
—20
50
mVpp
Vo2
—20
50
Transient Response
ttr
1 A/µs load step, 50% to 100% Iomax
30
µs
∆Vtr
Vo1, Vo2 over/undershoot
±2.0
%Vo
Over Current Threshold
IO trip
VI =36V,
Io1 + Io2
—24
A
reset followed by auto-recovery
Output Voltage Adjust Range
Vadj
Vo2 only
–20
+10
%Vo
Switching Frequency
ƒs
Over VI and IO ranges
500
550
600
kHz
Under-Voltage Lockout
VI on
VI increasing
34
V
VI off
VI decreasing
32
On/Off Enable (pin 3)
Referenced to –VI (pin 5)
Input High Voltage
VIH
+3.6
+75 (2)
V
Input Low Voltage
VIL
–0.2
+0.8
Input Low Current
IIL
—–1
mA
Standby Input Current
II standby
pins 3 & 5 connected
2
mA
Internal Input Capacitance
CI
—2
—µF
External Output Capacitance
Co1
0 (3)
5,000
µF
Co2
0 (3)
5,000
Reliability
MTBF
Per Telcordia SR-332
1.5
106 Hrs
50% stress, TA =40°C, ground benign
Notes:
(1) See Safe Operating Area curves or contact the factory for the appropriate derating.
(2) The On/Off Enable (pin 3) has an internal pull-up and may be controlled with an open-collector (or open-drain) transistor. The input is diode protected
and may be connected to +VI. The maximum open-circuit voltage is 7 V. If it is left open circuit the converter will operate when input power is applied.
(3) An output capacitor is not required.
SLTS218B - SEPTEMBER 2003 - REVISED NOVEMBER 2004


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