PT4120 Series
20-W 48-V Input Isolated
DC/DC Converter
Specifications (Unless otherwise stated, Ta =25°C, Vin =48V, Cout =0µF, and Io =Iomax)
PT4120 SERIES
Typ
Characteristic
Symbol
Conditions
Min
Max
Units
(1)
Output Current
Io
Over Vin range
Vo = 15V
Vo = 12V
Vo =5.0V
Vo ≤3.3V
0.1
—
—
—
—
1.3
1.6
4.0
5.0
0.1 (1)
A
(1)
0.1
(1)
0.1
Input Voltage Range
Set Point Voltage Tolerance
Vin
Vo tol
Over Io Range
36.0
—
—
—
—
—
—
—
—
—
48.0
1
—
0.5
0.2
7
0.4
13
2
75.0
1.5
50
—
1.0
33
1.0
33
—
VDC
%Vo
mV
%Vo
%Vo
mV
%Vo
mV
%Vo
mV
Vo≥5.0V
Vo≤3.3V
Temperature Variation
Line Regulation
Regtemp
Regline
–40° ≤Ta ≤ +85°C
Over Vin range
Vo≥5.0V
Vo≤3.3V
Vo ≥5.0V
Vo≤3.3V
Vo≥5.0V
Vo≤3.3V
Vo = 15V
Vo = 12V
Vo =5.0V
Vo =3.3V
Vo =1.8V
Load Regulation
Regload
∆Votot
η
Over Io range
Total Output Voltage Variation
Efficiency
Includes set-point, line load,
–40° ≤Ta ≤ +85°C
67
—
—
—
—
—
—
86
83
82
78
67
—
—
—
—
—
%
Vo Ripple (pk-pk)
Vr
20MHz bandwidth
Vo ≥5.0V
Vo ≤3.3V
—
—
—
—
—
—
600
800
—
0.5
15
100
3.0
150
2xIomax
650
850
31
—
—
—
—
—
—
700
900
—
%Vo
mVpp
µs
%Vo
mV
A
Transient Response
ttr
0.1A/µs, load step 50% to 100% Iomax
Vo over/undershoot
Vo ≥5.0V
Vo ≤3.3V
∆Vtr
Short Circuit Current
Switching Frequency
Isc
ƒs
Over Vin range
Vo ≥12.0V
Vo ≤ 5.2V
kHz
V
Under-Voltage Lockout
UVLO
Remote On/Off (Pin 1)
Referenced to –Vin (pin 2)
(2)
+0.8
Input High Voltage
VIH
VIL
IIL
2.5
—
—
–10
7
0.5
—
—
1100
—
7.0
V
–0.2
Input Low Voltage
Input Low Current
—
—
—
0
–
µA
mA
µF
µF
V
pF
MΩ
Standby Input Current
Internal Input Capacitance
External Output Capacitance
Isolation Voltage
Capacitance
Resistance
Iin standby
Cin
Cout
pins 1 & 2 connected
50
—
200
Between +Vo and –Vo
Input to output
1500
—
—
—
—
10
(3)
Operating Temperature Range
Storage Temperature
Reliability
T
Over Vin range
—
-40
-40
—
—
+85
°C
°C
a
T
+125
s
MTBF
Per Bellcore TR-332
6
4.0
—
—
—
10 Hrs
50% stress, Ta =40°C, ground benign
Mechanical Shock
—
Per Mil-Std-883D, method 2002.3,
1mS, half-sine, mounted to a fixture
Per Mil-Std-883D, method 2007.2,
20-2000Hz, soldered in a PC board
500
—
—
—
G’s
Mechanical Vibration
—
—
—
15
23
G’s
Weight
Flammability
—
—
—
grams
Materials meet UL 94V-0
Notes: (1) The DC/DC converter will operate at no load with reduced specifications.
(2) The Remote On/Off (pin 1) has an internal pull-up, and if it is left open circuit the PT4120 will operate when input power is applied. Refer to the
application notes for interface considerations.
(3) See Safe Operating Area curves or contact the factory for the appropriate derating.
For technical support and more information, see inside back cover or visit www.ti.com
ETC [ ETC ]
