PTB78520W Datasheet, PDF (3/15 Pages) Texas Instruments – 20-A, 18–60-V Input Auto-Track Compatible Isolated DC/DC Converter

PTB78520W
Not Recommended for New Designs
20-A, 18–60-V Input Auto-Track
Compatible Isolated DC/DC Converter
SLTS226A – JULY 2004 – REVISED OCTOBER 2005
Environmental & Absolute Maximum Ratings
Characteristics
Symbols
Conditions
Min
Typ
Max
Units
Input Voltage
Track Input Voltage
Track Input Current
Operating Temperature Range
Over-Temperature Protection
Solder Reflow Temperature
Storage Temperature
Mechanical Shock
Mechanical Vibration
Weight
Flammability
V_IN
Surge (100 ms maximum)
—
V_TRACK
0
I_TRACK (max) From external source
—
T_A
Over V_IN Range
–40
OTP
PCB temperature (near pin 1)
—
T_REFLOW
T_S
Surface temperature of module or pins
—
—
–40
Per Mil-STD-883D, Method 2002.3
T/H
—
1 msec, ½ Sine, mounted
SMD
—
Mil-STD-883D, Method 2007.2
20-2000 Hz, PCB mounted
T/H
—
SMD
—
—
—
—
Meets UL 94V-O
—
75
V
—
V_O Bus + 0.3 V
—
10 ⁽ⁱ⁾
mA
—
+85
°C
115
—
°C
—
235 ⁽ⁱⁱ⁾
°C
—
+125
°C
250
—
Gs
150
—
15
—
Gs
5
—
28.5
—
grams
Notes: (i) When the Track input is fed from an external voltage source, the input current must be limited. A 2.74-kΩ value series resistor is recommended.
(ii) During solder reflow of SMD package version, do not elevate the module PCB, pins, or internal component temperatures above a peak of 235 °C.
Specifications (Unless otherwise stated, T_A =25 °C, V_IN =24 V, V_O =3.3 V, C_O =0 µF, and I_O =I_Omax)
PTB78520W
Characteristic
Symbol
Conditions
Min
Typ
Max
Units
Output Current
Input Voltage Range
Set Point Voltage Tolerance
Temperature Variation
Line Regulation
Load Regulation
Total Output Voltage Variation
Output Voltage Adjust Range
Efficiency
V_o Ripple (pk-pk)
Transient Response
Track Input (pin 4)
Input Current
Open Circuit Voltage
Track Slew Rate Capability
Output Enable Input (pin 2)
Input High Voltage
Input Low Voltage
Input Low Current
Standby Input Current
No-Load Input Current
Over-Current Threshold
Output Over-Voltage Protection
Under-Voltage Lockout
I_O bus
I_O seq
I_O tot
V_IN
V_O tol
Reg_temp
Reg_line
Reg_load
∆V_Otot
∆V_ADJ
η
V_R
t_TR
∆V_TR
I_TRACK
V_TRACK
dV_TRACK/dt
V_IH
V_IL
I_IL
I_IN standby
I_IN no-load
I_TRIP
OVP
UVLO
Over V_IN range
Sum total I_O bus + I_O seq
Over I_O Range
–40° ≤T_A ≤ +85°C
Over V_IN range
Over I_O range
Includes set-point, line, load,
–40° ≤T_A ≤ +85°C
Over V_in range
I_O =10 A
R_SET =887 Ω, V_O =3.3 V
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
20 MHz bandwidth
1 A/µs load step, 50% to 100% I_Omax
V_O over/undershoot
pin connected to V_O COM
Referenced to –V_IN (pin 3)
pin 2 open
pins 2 & 3 connected, Io _TOT =0
Shutdown, followed by auto-recovery
Output shutdown and latch off
0
0
0
18
—
—
—
—
—
1.8
—
—
—
—
—
—
—
—
0
0.1 ⁽⁴⁾
2
–0.2
—
—
—
—
—
15.5
—
—
—
48
±0.6 ⁽³⁾
±0.8
±1
±1
±1.5
—
90
88.5
87
86.5
20
75
±3
—
—
—
—
—
–240
2
85
30
125
17
20 ⁽¹⁾
10 ^{(1) (2)}
20
60
—
—
—
—
±3 ⁽³⁾
3.6
—
—
—
—
—
—
—
–0.13
V_O Bus
1
open ⁽⁵⁾
+0.8
—
—
—
—
—
18
A
A
V
%V_O
%V_O
mV
mV
%V_O
V
%
mV_pp
µs
%V_O
mA
V
V/ms
V
µA
mA
mA
A
%V_O
V
Switching Frequency
Internal Input Capacitance
External Output Capacitance
Isolation Voltage
Capacitance
Resistance
Reliability
ƒ_S
C_IN
C_OUT
MTBF
Over V_IN range
Between +V_o and –V_o
Input-output & input-case
Input-output
Input-output
Telcordia TR-332
50% stress, T_A =40°C, ground benign
225
—
0
1,500
—
10
1.2
275
3
—
1,000
—
—
325
—
5,000
—
—
—
—
kHz
µF
µF
Vdc
pF
MΩ
10⁶ Hrs
Notes: (1) See SOA curves or consult factory for appropriate derating.
(2) When load current is supplied from the V_{O SEQ} output, the module will exhibit 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 Vo 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 will be turned 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_IN. See application notes for other interface considerations.
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