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PTB48560A Datasheet(PDF) 4 Page - Texas Instruments

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Part No. PTB48560A
Description  30-W, 48-V INPUT DC/DC CONVERTERS WITH AUTO-TRACK TM SEQUENCING
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

PTB48560A Datasheet(HTML) 4 Page - Texas Instruments

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PTB48560B ELECTRICAL CHARACTERISTICS
PTB48560A, PTB48560B
PTB48560C
SLTS236A–MARCH 2005–REVISED OCTOBER 2005
(Unless otherwise stated, TA = 25°C, VI =48V,VO = 3.3 V, CO = 220 µF, and IO =IOmax)
PTB48560B
PARAMETER
TEST CONDITIONS
UNIT
MIN
TYP
MAX
Over VI range
IO Bus
0.25 (1)
8 (2)
IO
Output current
IO Seq
0
4 (3)
A
Sum total, (IO Bus+IO Seq)
0.25
8
VI
Input voltage range
Over IO range
36
48
75
V
Set-point voltage tolerance
±1 (4)
%VO
Temperature variation
-40°C ≤ TA ≤ 85°C
±0.5
%VO
Line regulation
Over VI range
±7
±33
mV
VO
Load regulation
Over IO range
±13
±33
mV
Total output voltage variation
Includes set-point, line, load, –40°C ≤ TA ≤ 85°C
±2
±3 (4)
%VO
Adjust range
Over VI range
1.8
3.6
V
RSET =5.36kΩ,VO = 3.3 V
82%
η
Efficiency
RSET = 40.2 kΩ,VO = 2.5 V
79%
RSET = open , VO = 1.8 V
74%
VO Ripple (peak-to-peak)
20-MHz bandwidth
50
mVpp
0.1 A/µs load step,
Recovery time
100
µs
Transient response
50% to 100%
VO over/undershoot
±150
mV
IOmax
Input current
Track connected to -Sense
-0.13
mA
Track input (pin 5)
Open-circuit voltage
0
VO Bus
Input slew rate limits
0.1 (5)
1V/ms
Referenced to -VI
Input high voltage (VIH)
2
Open (6)
V
Output enable inputs (pins 2, 3)
Input low voltage (VIL)-0.2
0.8
Input low current (IIL)0.48
mA
Standby input current
Pins 2 and 3 open
8
16
mA
IO (tot)
Overcurrent threshold
Shutdown, followed by autorecovery
12
A
VI increasing
34
UVLO
Undervoltage lockout
V
VI decreasing
33
ƒS
Switching frequency
Over VI range
400
500
600
kHz
Internal input capacitance
1µF
External output capacitance
Between both outputs and VO COM
220
5,000
µF
Isolation voltage
Input-output
1,500
Vdc
Isolation capacitance
Input-output
2,000
pF
Isolation resistance
Input-output
10
MΩ
Telcordia SR-332 50% stress, TA = 40°C, ground
MTBF
Reliability
3.6
106 Hr
benign
(1) The converter requires a minimum load current at either the VO Seq or VO Bus output for proper operation. The converter is not
damaged when operated under a no-load condition.
(2) See temperature derating curves for safe operating area (SOA), to determine output current derating at elevated ambient temperatures.
(3) When load current is supplied from the VO Seq output, the module exhibits higher power dissipation and slightly lower operating
efficiency.
(4) The set-point voltage tolerance is affected by the tolerance and stability of RSET. The stated limit is unconditionally met if RSET has a
tolerance of 1%, with 100 ppm/°C temperature stability.
(5) When controlling the Track input from an external source, the slew rate of the applied signal must be greater than the minimum limit.
Failure to allow the voltage to completely rise to the voltage at the VO (bus) output, at no less than the minimum specified rate, may
thermally overstress the converter.
(6) The PEN and NEN inputs each have an internal pullup resistor. If the enable feature is not used, the PEN input (pin 2) should be left
open circuit and the NEN input (pin 3) permanently connected to –VI. A discrete MOSFET or bipolar transistor is recommended for the
enable control. The open-circuit voltage is less than 10 V. See the Application Information for a more detailed description.
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