PTB48500 Datasheet, PDF (3/14 Pages) Texas Instruments – Dual-Output, 48-V Input Isolated DC/DC Converter for xDSL

PTB48500
Dual-Output, 48-V Input Isolated
DC/DC Converter for xDSL
SLTS218B - SEPTEMBER 2003 - REVISED NOVEMBER 2004
Specifications (Unless otherwise stated, TA =25°C, VI =48 V, CI =0µF, CO =0 µF, and IO =50% Iomax)
Characteristic
Symbol
Conditions
Min
PTB48500A
Typ
Max
Units
Output Power
Output Current
Output Voltage
Temperature Variation
Line Regulation
Load Regulation
Cross Regulation
Efficiency
Vo Ripple (pk-pk)
Transient Response
Po1, Po2
Vo1 (3.3 V)
—
Vo₂ (1.2 V)
—
—
—
19.8
8.4
W
Po total
Both outputs
—
—
28
W
Io₁, Io₂
Over V_I range
Vo₁ (3.3 V)
0
Vo2 (1.2 V)
0
—
—
6 (1)
7 ⁽¹⁾
A
Io1 + Io2
Total (both outputs)
0
—
13
A
Vo1
Inlcudes set point, line, load,
Vo2
–40 ≤ TA ≤ +85°C
3.2
3.3
1.16
1.2
3.4
1.24
V
∆Regtemp
–40° ≤TA ≤ +85°C, IO =IO min
Vo1
—
Vo₂
—
±0.5
—
±0.8
—
%Vo
∆Regline
Over VI range
Vo1, Vo2
—
±1
±10
mV
∆Reg_load
Over I_O range
Vo₁, Vo₂
—
±3
±12
mV
∆Regcross
IO min ≤ Io2 ≤ Iomax, Io1 =1 A
IO min ≤ Io1 ≤ Iomax, Io2 =1 A
∆Vo1
—
∆Vo2
—
—
—
10
10
mV
η
Io1, Io2 =Iomax
—
82
—
%
Vr
20 MHz bandwidth
Vo1
—
Vo2
—
20
20
50
50
mVpp
ttr
1 A/µs load step, 50% to 100% Iomax
—
30
—
µs
∆Vtr
Vo1, Vo2 over/undershoot
—
±2.0
—
%Vo
Over Current Threshold
Iotrip
VI =36 V,
reset followed by auto-recovery
Io1 + Io2
13.5
16
—
A
Output Voltage Adjust Range
Switching Frequency
Under-Voltage Lockout
On/Off Enable (pin 3)
Input High Voltage
Input Low Voltage
Input Low Current
Vadj
ƒs
V_I on
VI off
VIH
V_IL
IIL
Vo₂ only
Over VI and IO ranges
V_I increasing
VI decreasing
Referenced to –VI (pin 5)
-10
—
500
550
—
34
—
32
+3.6
—
–0.2
—
—
–1
+20
600
—
—
+75 (2)
+0.8
—
%V_o
kHz
V
V
mA
Standby Input Current
Internal Input Capacitance
External Output Capacitance
Reliability
II standby
CI
Co1
Co2
MTBF
pins 3 & 5 connected
Per Telcordia SR-332
50% stress, T_A =40°C, ground benign
—
2
—
2
0 ⁽³⁾
—
0 (3)
—
1.5
—
—
—
5,000
5,000
—
mA
µF
µF
106 Hrs
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 +V_I. 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.
For technical support and further information visit http://power.ti.com