PTB48520W Datasheet, PDF (3/18 Pages) Texas Instruments – 25-A, 48-V INPUT ISOLATED DC/DC CONVERTER WITH AUTO-TRACK™ SEQUENCING

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PACKAGE SPECIFICATIONS
Weight
Flammability
Meets UL94V-O
PTB48520W (Suffixes AH and AS)
Mechanical shock
Per Mil-STD-883D, Method 2002.3
1 msec, 1/2 Sine, mounted
Mechanical vibration
Mil-STD-883D, Method 2007.2
20-2000 Hz, PCB mounted
(1) Qualification limit.
PTB48520W
SLTS233A – NOVEMBER 2004 – REVISED APRIL 2005
28.5 grams
Horizontal T/H (Suffix AH)
Horizontal SMD (Suffix AS)
Horizontal T/H (Suffix AH)
Horizontal SMD (Suffix AS)
250 Gs ⁽¹⁾
150 Gs ⁽¹⁾
15 Gs ⁽¹⁾
5 Gs ⁽¹⁾
ELECTRICAL CHARACTERISTICS
(Unless otherwise stated, T_A = 25°C, V_I = 48 V, V_O = 3.3 V, C_O = 0 µF, and I_O = I_Omax)
PARAMETER
TEST CONDITIONS
MIN
I_O
Output current
Over V_I range
Sum total I_O Bus + I_O Seq
V_I
Input voltage range
Over I_O range
Set-point voltage tolerance
I_O Bus
0
I_O Seq
0
0
36
Temperature variation
-40°C ≤ T_A ≤ 85°C
Line regulation
V_O
Load regulation
Over V_I range
Over I_O range
Total output voltage variation Includes set-point, line, load, –40°C ≤ T_A≤ 85°C
Adjust range
Over V_I range
1.8
R_SET = 887 Ω, V_O = 3.3 V
η
Efficiency
I_O = 15 A
R_SET = 6.98 kΩ, V_O = 2.5 V
R_SET = 35.7 kΩ, V_O = 2.0 V
R_SET = open cct. V_O = 1.8 V
V_O Ripple (peak-to-peak)
20 MHz bandwidth
1 A/µs load step, 50% to 100% I_Omax
Transient Response
Recovery time
Track input (pin 4)
V_O over/undershoot
Input current
Pin connected to V_O COM
Open-circuit voltage
0
Input slew rate limits
0.1 ⁽⁴⁾
Referenced to -V_I (pin 3)
Output enable input (pin 2)
Input high voltage (V_IH)
2
Input low voltage (V_IL)
-0.2
Input low current (I_IL)
Standby input current
Pin 2 open
No-load input current
Pins 2 and 3 connected, I_O Tot = 0
Overcurrent threshold, I_O (tot) Shutdown, followed by autorecovery
TYP
48
±0.6 ⁽³⁾
±0.8
±1
±1
±1.5
91%
90%
89%
88%
20
75
±3
–480
2
50
40
MAX
25 ⁽¹⁾
10 ^{(1) (2)}
25
75
±3 ⁽³⁾
3.6
UNIT
A
A
V
%V_o
%V_o
mV
mV
%V_o
V
mV_pp
-0.13
V_o Bus
1
µs
%V_o
mA
V
V/ms
Open ⁽⁵⁾
V
0.8
µA
mA
mA
A
(1) See temperature derating curves for safe operating area (SOA), or consult factory for appropriate derating.
(2) When load current is supplied from the V_O Seq output, the module exhibits higher power dissipation and slightly lower operating
efficiency.
(3) The set-point voltage tolerance is affected by the tolerance and stability of R_SET. The stated limit is unconditionally met if R_SET has a
tolerance of 1%, with 100 ppm/°C temperature stability.
(4) 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 V_O (bus) output, at no less than the minimum specified rate, may
thermally overstress the converter.
(5) The V_O Enable input has an internal pull-up, and if left open the converter output isturned off. A discrete MOSFET or bipolar transistor is
recommended to control this input. The open-circuit voltage is approximately 20% of the input voltage. If the output enable feature is not
used, this pin should be permanently connected to –V_I. See the application information for other interface considerations.
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