For technical support and more information, see inside back cover or visit www.ti.com
Standard Application
Features
•Input Voltage Range:
36V to 75V
•20W Rated
•82% Efficiency
•1500 VDC Isolation
•Low Profile (8.5 mm)
•Small Footprint: 1.52in x 1.73in
•Remote On/Off
PT4120 Series
20-W 48-V Input Isolated
DC/DC Converter
PT4120
LOAD
3
2
1
5
4
6
+V
OUT
–V
OUT
V
O
Adj
+V
IN
–V
IN
Remote
On/Off
Q
1
BSS138
SLTS092B
(Revised 2/26/2002)
Ordering Information
PT4121H = 3.3V/5A (16.5W)
PT4122H = 5.0V/4A
PT4123H = 12.0V/1⋅6A
PT4124H = 15.0V/1⋅3A
PT4125H = 5.2V/3·8A
PT4126H = 1.5V/5A (7.5W)
PT4127H = 1.8V/5A (9W)
PT4128H = 2.5V/5A (12.5W)
PT4129H = 1.65V/5A (8·25W)
Pin-Out Information
Pin Function
1 Remote On/Off †
2–V
in
3+V
in
4 –Vout
5 +Vout
6V
out Adjust †
† For further information, see
application notes.
Description
The PT4120 power modules are a series
of isolated DC/DC converters housed a low-
profile package. Rated for 20 watts or 5A, the
series includes standard output voltages rang-
ing from as low as 1.5VDC to 15VDC. The
output may be adjusted ±10% of nominal.
These converters are ideal for Telecom,
Industrial, Computer, and other distributed
power applications that require input-to-
output isolation.
Using multiple PT4120 modules, system
designers can implement a complete custom
power supply solution. The flexibility of full
isolation also allows the input or output to be
configured for negative voltage operation.
The PT4120 series requires no additional
components for proper operation.
•Short Circuit Protection
•Over Temperature Shutdown
•Under-Voltage Lockout
•UL1950 Recognized
•CSA 22.2 950 Certified
•EN60950 Approved
•4×106 Hrs MTBF
PT Series Suffix (PT1234x)
Case/Pin Order Package
Configuration Suffix Code *
Horizontal A(EGD)
SMD C(EGE)
* Previously known as package style 710.
(Reference the applicable package code draw-
ing for the dimensions and PC board layout)
For technical support and more information, see inside back cover or visit www.ti.com
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
Characteristic Symbol Conditions Min Typ Max Units
Output Current IoOver Vin range Vo = 15V 0.1 (1) — 1.3
Vo = 12V 0.1 (1) — 1.6 A
Vo =5.0V 0.1 (1) — 4.0
Vo ≤ 3.3V 0.1 (1) — 5.0
Input Voltage Range Vin Over Io Range 36.0 48.0 75.0 VDC
Set Point Voltage Tolerance Vo tol Vo ≥5.0V — ±1 ±1.5 %Vo
Vo ≤3.3V — — ±50 mV
Temperature Variation Regtemp –40° ≤Ta ≤ +85°C — ±0.5 — %Vo
Line Regulation Regline Over Vin range Vo ≥5.0V — ±0.2 ±1.0 %Vo
Vo ≤3.3V — ±7 ±33 mV
Load Regulation Regload Over Io range Vo ≥5.0V — ±0.4 ±1.0 %Vo
Vo ≤3.3V — ±13 ±33 mV
Total Output Voltage Variation ∆Votot Includes set-point, line load, Vo ≥5.0V — ±2 — %Vo
–40° ≤Ta ≤ +85°C Vo ≤3.3V — ±67 — mV
Efficiency ηVo = 15V — 86 —
Vo = 12V — 83 —
Vo =5.0V — 82 — %
Vo =3.3V — 78 —
Vo =1.8V — 67 —
Vo Ripple (pk-pk) Vr20MHz bandwidth Vo ≥ 5.0V — 0.5 — %Vo
Vo ≤ 3.3V — 15 — mVpp
Transient Response ttr 0.1A/µs, load step 50% to 100% Iomax — 100 — µs
∆Vtr Vo over/undershoot Vo ≥ 5.0V — ±3.0 — %Vo
Vo ≤ 3.3V — ±150 — mV
Short Circuit Current Isc — 2xIomax — A
Switching Frequency ƒsOver Vin range Vo ≥ 12.0V 600 650 700 kHz
Vo ≤ 5.2V 800 850 900
Under-Voltage Lockout UVLO — 31 — V
Remote On/Off (Pin 1) Referenced to –Vin (pin 2)
Input High Voltage VIH 2.5 — 7.0 (2) V
Input Low Voltage VIL –0.2 — +0.8
Input Low Current IIL — –10 – µA
Standby Input Current Iin standby pins 1 & 2 connected — 7 50 mA
Internal Input Capacitance Cin — 0.5 — µF
External Output Capacitance Cout Between +Vo and –Vo0 — 200 µF
Isolation Voltage Input to output 1500 — — V
Capacitance — 1100 — pF
Resistance 10——MΩ
Operating Temperature Range TaOver Vin range -40 — +85 (3) °C
Storage Temperature Ts— -40 — +125 °C
Reliability MTBF Per Bellcore TR-332 4.0 — — 106 Hrs
50% stress, Ta =40°C, ground benign
Mechanical Shock — Per Mil-Std-883D, method 2002.3, — 500 — G’s
1mS, half-sine, mounted to a fixture
Mechanical Vibration — Per Mil-Std-883D, method 2007.2, — 15 — G’s
20-2000Hz, soldered in a PC board
Weight — — — 23 — grams
Flammability — 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
Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.
Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures
Typical Characteristics
PT4120 Series
20-W 48-V Input Isolated
DC/DC Converter
PT4122, 5.0 VDC (See Note A)
Efficiency vs Output Current Efficiency vs Output Current
Ripple vs Output Current Ripple vs Output Current
Safe Operating Area, Vin =48V (See Note B)
Power Dissipation vs Output Current Power Dissipation vs Output Current
PT4121, 3.3 VDC (See Note A) PT4123, 12.0 VDC (See Note A)
Efficiency vs Output Current
Ripple vs Output Current
Power Dissipation vs Output Current
50
60
70
80
90
012345
Iout (A)
Efficiency - %
36.0V
48.0V
75.0V
Vin
0
2
4
6
8
10
12
012345
Iout (A)
Ripple - mV
75.0V
48.0V
36.0V
Vin
0
1
2
3
4
5
6
012345
Iout (A)
Pd - Watts
75.0V
48.0V
36.0V
Vin
50
55
60
65
70
75
80
85
90
0 0.5 1 1.5 2 2.5 3 3.5 4
Iout (A)
Efficiency - %
36.0V
48.0V
75.0V
Vin
0
2
4
6
8
10
12
14
16
0 0.5 1 1.5 2 2.5 3 3.5 4
Iout (A)
Ripple - mV
75.0V
48.0V
36.0V
Vin
0
1
2
3
4
5
6
0 0.5 1 1.5 2 2.5 3 3.5 4
Iout (A)
Pd - Watts
75.0V
48.0V
36.0V
Vin
50
55
60
65
70
75
80
85
90
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
Iout (A)
Efficiency - %
36.0V
48.0V
75.0V
Vin
0
10
20
30
40
50
60
70
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
Iout (A)
Ripple - mV
75.0V
48.0V
36.0V
Vin
0
1
2
3
4
5
6
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
Iout (A)
Pd - Watts
75.0V
48.0V
36.0V
Vin
Safe Operating Area, Vin =48V (See Note B) Safe Operating Area, Vin =48V (See Note B)
20
30
40
50
60
70
80
90
012345
Iout (A)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat conv
Airflow
20
30
40
50
60
70
80
90
01234
Iout (A)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat conv
Airflow
20
30
40
50
60
70
80
90
0 0.25 0.5 0.75 1 1.25 1.5 1.75
Iout (A)
Ambient Temperature (°C)
200LFM
120LFM
60LFM
Nat conv
Airflow
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
Using the Remote On/Off Function on the PT4120/
PT4140 Series of Isolated DC/DC Converters
For applications requiring output voltage on/off control,
the PT4120/4140 series of DC/DC converters incorporate
a remote on/off function. This function may be used in
applications that require battery conservation, power-up/
shutdown sequencing, and/or to co-ordinate the power-
up of the regulator for active in-rush current control. (See
the related application note, AN21).
This function is provided by the Remote On/Off control,
pin1. If pin 1 is left open-circuit, the converter provides a
regulated output whenever a valid source voltage3 is ap-
plied between +Vin(pin 3), and –Vin (pin 2). Applying a
low-level ground signal 1 to pin 1 will disable the regula-
tor output 5.
Table 1 provides details of the threshold requirements for
the Remote On/Off pin. Figure 1 shows how a discrete
MOSFET (Q1) 4, may be referenced to the negative input
voltage rail and used with this control input.
Table 1 Inhibit Control Thresholds
Parameter min max
Enable (VIH) 2.5V (Open Circuit) 2, 4
Disable (VIL) –0.3V 0.8V
Notes:
1. The on/off control uses -Vin (pin 2), the primary side of
the converter as its ground reference. All voltages specified
are with respect to -Vin.
2. The on/off control internal circuitry is a high impedance
10µA current source. The open-circuit voltage may be as
high as 8.3Vdc.
3. The PT4120/40 series incorporates an “Under Voltage
Lockout” (UVLO) function. This function automatically
inhibits the converter output until there is sufficient input
voltage for the converter to produce a regulated output.
Table 2 gives the applicable UVLO thresholds.
Table 2 UVLO Thresholds
Series UVLO Threshold Vin Range
PT4120 31V Typical 36 – 75V
PT4140 15V Typical 18 – 40V
4. The Remote On/Off input of the PT4120/40 series regulators
must be controlled with an open-collector (or open-drain)
discrete transistor or MOSFET. Do not use a pull-up resistor.
5. When the converter output is disabled, the current drawn
from the input supply is typically reduced to 8mA (16mA
maximum).
Figure 1
Turn-On Time: The converter typically produces a fully
regulated output voltage within 50ms after the applica-
tion of power, or the removal of the low voltage signal 6
from the Remote On/Off pin. The actual turn-on time
will vary with the input voltage, output load, and the
total amount of capacitance connected to the output.
Using the circuit of Figure 1, Figure 2 shows the output
voltage and input current waveforms of a PT4121 after
Q1 is turned off. The turn off of Q1 corresponds to the
drop in Q1 Vgs voltage. The waveforms were measured
with a 48Vdc input voltage, and 2.75-A resistive load.
Figure 2
+V
in
–V
in
+V
o
–V
o
PT4121
+Vout
–Vout
+Vin
–Vin Remote
On/Off V
o
(adj)
1
2
35
4
6
Q1
BSS138
Inh
Note 2
PT4120/4140 Series
Vout (2V/Div)
Iin (0.2A/Div)
Q1 Vgs (10V/Div)
HORIZ. SCALE: 5ms/Div
6. Keep the on/off transition to less than 1ms. This prevents
erratic operation of the ISR, whereby the output voltage
may drift un-regulated between 0V and the rated output
during power-up.
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Adjusting the Output Voltage of the PT4120/
PT4140 Series of Isolated DC/DC Converters
The factory pre-set output voltage of Power Trends’
PT4120 and PT4140 series of isolated DC/DC converters
may be adjusted within ±10% of nominal. Adjustment is
made from the secondary side of the regulator1 with a
single external resistor. For the input voltage range
specified in the data sheet Table 1 gives the allowable
adjustment range for each model, as Vo (min) and Vo (max).
Adjust Up: An increase in the output voltage is obtained
by adding a resistor, R2 between pin 6 (Vo adjust), and pin
4 (-Vout).
Adjust Down: Add a resistor (R1), between pin 6 (Vo ad-
just) and pin 5 (+Vout).
Refer to Figure 1 and Table 2 for both the placement
and value of the required resistor, (R1) or R2.
Notes:
1. The PT4120 and PT4140 series of DC/DC converters
incorporate isolation between the Vin and Vo terminals.
Adjustment of the output voltage is made to the
regulation circuit on the secondary or output side of
the converter.
2. The maximum rated output power for this series is
20W. An increase in the output voltage may therefore
require a corresponding reduction in the maximum
output current (see Table 1). The revised maximum
output current must be determined as follows:-
Io(max) = 20 A, or 5A, whichever is less.
Va
Where Va is the adjusted ouput voltage.
3. Use only a single 1% resistor in either the (R1) or R2
location. Place the resistor as close to the ISR as possible.
Table 1
DC/DC CONVERTER ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt #
48V Bus PT4126 PT4129 PT4127 PT4128 PT4121 PT4122 PT4125 PT4123 PT4124
24V Bus PT4146 PT4147 PT4148 PT4141 PT4142 PT4143 PT4144
Max Current 25A 5A 5A 5A 5A 4A 3.8A 1.6A 1.3A
Vo(nom) 1.5 1.65 1.8 2.5 3.3 5.0 5.2V 12.0 15.0
Va(min) 1.35 1.49 1.62 2.25 2.95 4.5 4.75 10.8 13.5
Va(max) 1.65 1.81 1.98 2.75 3.65 5.5 5.75 13.2 16.5
Vr1.225 1.225 1.225 1.225 1.225 2.5 2.5 2.5 2.5
Ko (V·kΩΩ
ΩΩ
Ω)67.07 63.9 69.7 64.2 69.3 125.2 134.7 139.8 137.6
Rs (kΩΩ
ΩΩ
Ω)43.2 66.5 110.0 187.0 187.0 187.0 243.0 110.0 90.9
Figure 1
(R1)
Adj Down
R2
Adj
Up
+V
in
–V
in
+V
o
–V
o
PT4120/40
+Vout
–Vout
+Vin
–Vin Remote
On/Off V
o
(
ad
j)
1
2
35
4
6
4. Never connect capacitors to Vo adjust. Any capacitance
added to the Vo adjust control pin will affect the stability of
the ISR.
The values of (R1) [adjust down], and R2 [adjust up], can also
be calculated using the following formulas.
(R1)=Ko (Va – Vr)– RskΩ
Vr (Vo – Va)
R2= Ko– RskΩ
(Va – Vo)
Where Vo= Original output voltage
Va= Adjusted output voltage
Vr= Reference voltage (Table 1)
Ko= Multiplier constant (Table 1)
Rs= Internal series resistance (Table 1)
PT4120/4140 Series
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
continued
PT4122
PT4142
5.0Vdc
Va(req’d)
4.5 (12.6)kΩ
4.55 (40.3)kΩ
4.6 (75.0)kΩ
4.65 (120.0)kΩ
4.7 (179.0)kΩ
4.75 (262.0)kΩ
4.8 (387.0)kΩ
4.85 (595.0)kΩ
4.9 (1.01)MΩ
4.95
5.0
5.05
5.1 1.06MΩ
5.15 645.0kΩ
5.2 437.0kΩ
5.25 312.0kΩ
5.3 229.0kΩ
5.35 169.0kΩ
5.4 125.0kΩ
5.45 90.2kΩ
5.5 62.4kΩ
48V Bus PT4126 PT4127 PT4128 PT4121
24V Bus PT4146 PT4147 PT4148 PT4141
Vo(nom) 1.5Vdc 1.8Vdc 2.5Vdc 3.3Vdc
Va(req’d)
1.35 (2.8)kΩ
1.4 (53.2)kΩ
1.45 (204.0)kΩ
1.5
1.55 1.3MΩ
1.6 627.0kΩ
1.65 404.0kΩ(51.7)kΩ
1.7 (161.0)kΩ
1.75 (489.0)kΩ
1.8
1.85 1.28MΩ
1.9 587.0kΩ
1.95 355.0kΩ
2.25 (26.5)kΩ
2.3 (92.9)kΩ
2.35 (203.0)kΩ
2.4 (425.0)kΩ
2.45 (1.09)MΩ
2.5
2.55 1.09MΩ
2.6 450.0kΩ
2.65 237.0kΩ
2.7 131.0kΩ
2.75 67.7kΩ
2.95 (90.7)kΩ
3.0 (146.0)kΩ
3.05 (224.0)kΩ
3.1 (341.0)kΩ
3.15 (536.0)kΩ
3.2 (926.0)kΩ
3.25 (2.09)MΩ
3.3
3.35 1.19MΩ
3.4 502.0kΩ
3.45 272.0kΩ
3.5 158.0kΩ
3.55 88.7kΩ
3.6 42.7kΩ
3.65 9.9kΩ
Table 2
DC/DC CONVERTER SERIES ADJUSTMENT RESISTOR VALUES
Series Pt #
R1 = (Blue) R2 = Black
PT4123 PT4124
PT4143 PT4144
12.0Vdc 15.0Vdc
Va(req’d)
10.8 (276.0)kΩ
11.0 (365.0)kΩ
11.2 (497.0)kΩ
11.4 (719.0)kΩ
11.6 (1.16)MΩ
11.8
12.0
12.2 588.0kΩ
12.4 239.0kΩ
12.6 123.0kΩ
12.8 64.6kΩ
13.0 29.7kΩ
13.2 6.4kΩ
13.5 (312.0)kΩ
13.6 (345.0)kΩ
13.8 (427.0)kΩ
14.0 (542.0)kΩ
14.2 (713.0)kΩ
14.4 (1.0)MΩ
14.6 (1.57)MΩ
14.8
15.0
15.2 597.0kΩ
15.4 253.0kΩ
15.6 138.0kΩ
15.8 81.0kΩ
16.0 46.6kΩ
16.5 0.8kΩ
PT4120/4140 Series
PACKAGE OPTION ADDENDUM
www.ti.com 13-Aug-2011
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
PT4121C NRND DIP MODULE EGE 6 16 Pb-Free (RoHS) Call TI Level-1-215C-UNLIM
PT4122A NRND DIP MODULE EGD 6 16 Pb-Free (RoHS) Call TI N / A for Pkg Type
PT4122C NRND DIP MODULE EGE 6 16 Pb-Free (RoHS) Call TI Level-1-215C-UNLIM
PT4123A NRND DIP MODULE EGD 6 16 Pb-Free (RoHS) Call TI N / A for Pkg Type
PT4124A NRND DIP MODULE EGD 6 16 Pb-Free (RoHS) Call TI N / A for Pkg Type
PT4124C NRND DIP MODULE EGE 6 16 Pb-Free (RoHS) Call TI Level-1-215C-UNLIM
PT4126A NRND DIP MODULE EGD 6 16 Pb-Free (RoHS) Call TI N / A for Pkg Type
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
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