PTB48500 Datasheet, PDF (7/14 Pages) Texas Instruments – Dual-Output, 48-V Input Isolated DC/DC Converter for xDSL

PTB48502
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 =0 µF, CO =0 µF, and IO =50% IO max)
Characteristic
Symbol
Conditions
Min
PTB48502A
Typ
Max
Units
Output Power
Po₁, Po₂
Po total
Both outputs
Vo₁ (3.3 V)
—
Vo2 (1.2 V)
—
—
—
33
15.6
W
—
—
45
W
Output Current
Output Voltage
Temperature Variation
Line Regulation
Load Regulation
Cross Regulation
Efficiency
Vo Ripple (pk-pk)
Transient Response
Over Current Threshold
Io1, Io2
Over Vin range
Vo1 (3.3 V)
0
Vo2 (1.2 V)
0
—
—
10 ⁽¹⁾
13 (1)
A
Io1 + Io2
Total (both outputs)
0
—
21
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
∆Reg_temp
–40° ≤T_A ≤ +85°C, I_o =I_omin
Vo₁
—
Vo2
—
±0.5
—
±0.8
—
%Vo
∆Regline
Over VI range
Vo1, Vo2
—
±1
±10
mV
∆Regload
Over IO 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
∆V_tr
Vo₁, Vo₂ over/undershoot
—
±2.0
—
%V_o
Iotrip
VI =36V,
reset followed by auto-recovery
Io₁ + Io₂
—
24
—
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
VI on
VI off
V_IH
VIL
I_IL
Vo2 only
Over VI and Io ranges
VI increasing
VI decreasing
Referenced to –VI (pin 5)
–20
—
500
550
—
34
—
32
+3.6
—
–0.2
—
—
–1
+10
600
—
—
+75 (2)
+0.8
—
%Vo
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.
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