參數資料
型號： PTB78520WAS
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源模塊
英文描述： 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
封裝： DIP-10
文件頁數： 9/15頁
文件大小： 443K
代理商： PTB78520WAS
For technical support and further information visit http://power.ti.com
PTB78520W
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
VIN
Surge (100 ms maximum)
—
75
V
Track Input Voltage
VTRACK
0
—
VO Bus + 0.3
V
Track Input Current
ITRACK (max)
From external source
—
10 (i)
mA
Operating Temperature Range
TA
Over VIN Range
–40
—
+85
°C
Over-Temperature Protection
OTP
PCB temperature (near pin 1)
—
115
—
°C
Solder Reflow Temperature
TREFLOW
Surface temperature of module or pins
—
235 (ii)
°C
Storage Temperature
TS
—
–40
—
+125
°C
Mechanical Shock
Per Mil-STD-883D, Method 2002.3
T/H
—
250
—
Gs
1 msec, Sine, mounted
SMD
—
150
—
Mechanical Vibration
Mil-STD-883D, Method 2007.2
T/H
—
15
—
Gs
20-2000 Hz, PCB mounted
SMD
—
5
—
Weight
—
28.5
—
grams
Flammability
—
Meets UL 94V-O
Notes:
(i) When the Track input is fed from an external voltage source, the input current must be limited. A 2.74-k
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, VIN =24 V, VO =3.3 V, CO =0 F, and IO =IOmax)
PTB78520W
Characteristic
Symbol
Conditions
Min
Typ
Max
Units
Output Current
IO bus
Over VIN range
0
—
20 (1)
A
IO seq
0
—
10 (1)(2)
IO tot
Sum total IO bus + IO seq
0
—
20
A
Input Voltage Range
VIN
Over IO Range
18
48
60
V
Set Point Voltage Tolerance
VO tol
—
±0.6 (3)
—%VO
Temperature Variation
Regtemp
–40°
≤TA ≤ +85°C
—
±0.8
—
%VO
Line Regulation
Regline
Over VIN range
—
±1
—
mV
Load Regulation
Regload
Over IO range
—
±1
—
mV
Total Output Voltage Variation
VOtot
Includes set-point, line, load,
—
±1.5
±3 (3)
%VO
–40°
≤TA ≤ +85°C
Output Voltage Adjust Range
VADJ
Over Vin range
1.8
—
3.6
V
Efficiency
η
IO =10 A
RSET =887 ,VO =3.3 V
—
90
—
RSET =6.98 k,VO =2.5 V
—
88.5
—
%
RSET =35.7 k,VO =2.0 V
—
87
—
RSET =open cct. VO =1.8 V
—
86.5
—
Vo Ripple (pk-pk)
VR
20 MHz bandwidth
—
20
—
mVpp
Transient Response
tTR
1 A/s load step, 50% to 100% IOmax
—
75
—
s
VTR
VO over/undershoot
—
±3
—
%VO
Track Input (pin 4)
Input Current
ITRACK
pin connected to VO COM
—
–0.13
mA
Open Circuit Voltage
VTRACK
0—
VO Bus
V
Track Slew Rate Capability
dVTRACK/dt
0.1 (4)
—
1
V/ms
Output Enable Input (pin 2)
Referenced to –VIN (pin 3)
Input High Voltage
VIH
2
—
open (5)
V
Input Low Voltage
VIL
–0.2
—
+0.8
Input Low Current
IIL
—
–240
—
A
Standby Input Current
IIN standby
pin 2 open
—
2
—
mA
No-Load Input Current
IIN no-load
pins 2 & 3 connected, Io TOT =0
—
85
—
mA
Over-Current Threshold
ITRIP
Shutdown, followed by auto-recovery
—
30
—
A
Output Over-Voltage Protection
OVP
Output shutdown and latch off
—
125
—
%VO
Under-Voltage Lockout
UVLO
15.5
17
18
V
Switching Frequency
S
Over VIN range
225
275
325
kHz
Internal Input Capacitance
CIN
—3
—F
External Output Capacitance
COUT
Between +Vo and –Vo
0
5,000
F
Isolation Voltage
Input-output & input-case
1,500
—
Vdc
Capacitance
Input-output
—
1,000
—
pF
Resistance
Input-output
10
—
M
Reliability
MTBF
Telcordia TR-332
1.2
—
106 Hrs
50% stress, TA =40°C, ground benign
Notes:
(1) See SOA curves or consult factory for appropriate derating.
(2) When load current is supplied from the VO 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 RSET. The stated limit is unconditionally met if RSET 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 ‘VO 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 –VIN. See application notes for other interface considerations.
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