PTB48500_14 Datasheet, PDF (4/18 Pages) Texas Instruments – DUAL-OUTPUT, 48-V INPUT ISOLATED DC/DC CONVERTER for xDSL

PTB48500 ^{PTB48500A and PTB48502A are Not Recommended for New Designs}
PTB48501
PTB48502
SLTS218C – SEPTEMBER 2003 – REVISED AUGUST 2006
www.ti.com
ELECTRICAL CHARACTERISTICS (PTB48501A)
(Unless otherwise stated, T_A = 25°C, V_I = 48 V, C_I = 0 µF, C_O = 0 µF, and I_O = 50% I_omax)
PARAMETER
TEST CONDITIONS
Po₁, Po₂
Po _total
Io₁, Io₂
Io₁ + Io₂
Vo₁
Vo₂
∆Reg_temp
∆Reg_line
∆Reg_load
∆Reg_cross
η
V_r
t_tr
∆V_tr
I_otrip
Vadj
f_S
V_I on
V_I off
V_IH
V_IL
I_IL
I_I standby
C_I
Co₁
Co₂
MTBF
Output Power
Both outputs
Output Current
Output Voltage
Temperature Variation
Line Regulation
Load Regulation
Cross Regulation
Efficiency
V_O Ripple (pk-pk)
Transient Response
Over Current Threshold
Output Voltage Adjust
Range
Switching Frequency
Under-Voltage Lockout
On/Off Enable (pin 3)
Input High Voltage
Input Low Voltage
Input Low Current
Standby Input Current
Internal Input Capacitance
External Output
Capacitance
Reliability
Vo₁ (3.3 V)
Vo₂ (1.2 V)
Over V_I range
Total (both outputs)
Vo₁ (3.3 V)
Vo₂ (1.2 V)
Includes set point, line, load, –40°C ≤ T_A ≤ 85°C
–40°C ≤ T_A ≤ 85°C, I_O = I_O min
Over V_I range
Over _IO range
I_O min ≤ Io₂≤ I_omax, Io₁ = 1 A
I_O min ≤ Io₁≤ I_omax, Io₂ = 1 A
Io₁, Io₂ = I_omax
20 MHz bandwidth
1 A/µs load step, 50% to 100% I_omax
Vo₁, Vo₂ over/undershoot
V_I = 36 V, reset followed by auto-recovery
Vo₂ only
Over V_I and I_O ranges
V_I increasing
V_I decreasing
Referenced to –V_I (pin 5)
Vo₁
Vo₂
Vo₁, Vo₂
Vo₁, Vo₂
∆Vo₁
∆Vo₂
Vo₁
Vo₂
Io₁ + Io₂
Pins 3 and 5 connected
Per Telcordia SR-332 50% stress, T_A = 40°C,
ground benign
PTB48501A
MIN
TYP MAX
19.8
12.6
32.4
0
6 ⁽¹⁾
0
10.5 ⁽¹⁾
0
16.5
3.2
3.3 3.4
1.16
1.2 1.24
±0.5
±0.8
±1 ±10
±3 ±12
10
10
81%
20
50
20
50
30
±2.0
24
UNIT
W
W
A
A
V
%V_O
mV
mV
mV
mV_pp
µs
%V_O
A
–20
10 %V_o
500
550 600 kHz
34
V
32
3.6
–0.2
0 ⁽³⁾
0 ⁽³⁾
1.5
75 ⁽²⁾
V
0.8
–1
mA
2
mA
2
µF
5000
µF
5000
10⁶ Hrs
(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.
4
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