PT4121 [ETC]
3.3Vout 5A 48V-Input Isolated DC-DC Converter ; 3.3V输出5A 48V ,输入隔离DC- DC转换器\n型号: | PT4121 |
厂家: | ETC |
描述: | 3.3Vout 5A 48V-Input Isolated DC-DC Converter
|
文件: | 总7页 (文件大小:158K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
PT4120 Series
20-W 48-V Input Isolated
DC/DC Converter
SLTS092B
(Revised 2/26/2002)
Features
• Input Voltage Range:
36V to 75V
• Short Circuit Protection
• Over Temperature Shutdown
• Under-Voltage Lockout
• UL1950 Recognized
• 20W Rated
• 82% Efficiency
• 1500 VDC Isolation
• Low Profile (8.5 mm)
• Small Footprint: 1.52in x 1.73in
• Remote On/Off
• CSA 22.2 950 Certified
• EN60950 Approved
6
• 4×10 Hrs MTBF
Pin-Out Information
Description
Ordering Information
Pin Function
PT 4121r = 3.3V/5A (16.5W)
PT 4122r = 5.0V/4A
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.
†
1
2
3
4
5
6
Remote On/Off
PT 4123r = 12.0V/1 6A
PT 4124r = 15.0V/1 3A
PT 4125r = 5.2V/3·8A
PT 4126r = 1.5V/5A (7.5W)
PT 4127r = 1.8V/5A (9W)
PT 4128r = 2.5V/5A (12.5W)
PT 4129r = 1.65V/5A (8·25W)
–V
in
in
+V
–Vout
+Vout
V
Adjust †
out
† For further information, see
application notes.
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.
PT Series Suffix
Case/Pin
Configuration
(PT1234x)
O rder
Suffix
Package
Code *
Horizontal
SMD
A
C
(EGD)
(EGE)
* Previously known as package style 710.
(Reference the applicable package code draw-
ing for the dimensions and PC board layout)
Standard Application
+VIN
+VOUT
3
5
LOAD
PT4120
–VIN
–VOUT
2
4
1
6
Remote
On/Off
VOAdj
Q1
BSS138
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
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
Typical Characteristics
PT4120 Series
20-W 48-V Input Isolated
DC/DC Converter
PT4121, 3.3 VDC (See Note A)
PT4122, 5.0 VDC (See Note A)
PT4123, 12.0 VDC (See Note A)
Efficiency vs Output Current
Efficiency vs Output Current
Efficiency vs Output Current
90
90
90
85
85
80
75
70
65
60
55
50
80
70
60
50
80
Vin
Vin
Vin
75
36.0V
48.0V
75.0V
36.0V
36.0V
48.0V
75.0V
70
65
60
55
50
48.0V
75.0V
0
1
2
3
4
5
0
0.5
1
1.5
2
2.5
3
3.5
4
0
0.2 0.4 0.6 0.8
Iout (A)
1
1.2 1.4 1.6
Iout (A)
Iout (A)
Ripple vs Output Current
Ripple vs Output Current
Ripple vs Output Current
12
10
8
16
14
12
10
8
70
60
50
40
30
20
10
0
Vin
Vin
Vin
75.0V
48.0V
36.0V
75.0V
48.0V
36.0V
75.0V
48.0V
36.0V
6
6
4
4
2
2
0
0
0
1
2
3
4
5
0
0.5
1
1.5
2
2.5
3
3.5
4
0
0.2 0.4 0.6 0.8
Iout (A)
1
1.2 1.4 1.6
Iout (A)
Iout (A)
Power Dissipation vs Output Current
Power Dissipation vs Output Current
Power Dissipation vs Output Current
6
5
4
3
2
1
0
6
5
4
3
2
1
0
6
5
4
3
2
1
0
Vin
Vin
Vin
75.0V
48.0V
36.0V
75.0V
48.0V
36.0V
75.0V
48.0V
36.0V
0
1
2
3
4
5
0
0.5
1
1.5
2
2.5
3
3.5
4
0
0.2 0.4 0.6 0.8
Iout (A)
1
1.2 1.4 1.6
Iout (A)
Iout (A)
Safe Operating Area, Vin =48V (See Note B)
Safe Operating Area, Vin =48V (See Note B)
Safe Operating Area, Vin =48V (See Note B)
90
80
70
60
50
40
30
20
90
80
70
60
50
40
30
20
90
80
70
60
50
40
30
20
Airflow
Airflow
Airflow
200LFM
120LFM
60LFM
200LFM
120LFM
60LFM
200LFM
120LFM
60LFM
Nat conv
Nat conv
Nat conv
0
1
2
3
4
5
0
1
2
3
4
0
0.25 0.5 0.75
1
1.25 1.5 1.75
Iout (A)
Iout (A)
Iout (A)
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
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT4120/4140 Series
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).
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.
Figure 1
+V o
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.
3
2
5
4
+Vin
+Vout
+V in
PT4121
–Vin
–Vout
Remote
On/Off
Vo(adj)
6
–V o
1
Q1
BSS138
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.
Inh
Note
2
–V in
Table 1 Inhibit Control Thresholds
Parameter
min
max
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.
2, 4
Enable (VIH
Disable (VIL
)
)
2.5V
–0.3V
(Open Circuit)
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.
Figure 2
Vout (2V/Div)
Iin (0.2A/Div)
Table 2 UVLO Thresholds
Series
UVLO Threshold
Vin Range
PT4120
PT4140
31V Typical
15V Typical
36 – 75V
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.
Q1 Vgs (10V/Div)
5. When the converter output is disabled, the current drawn
from the input supply is typically reduced to 8mA (16mA
maximum).
HORIZ. SCALE: 5ms/Div
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT4120/4140 Series
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
4. Never connect capacitors to Vo adjust. Any capacitance
added to the Vo adjust control pin will affect the stability of
the ISR.
1
made from the secondary side of the regulator with a
The values of (R1) [adjust down], and R2 [adjust up], can also
be calculated using the following formulas.
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).
Ko (Va – Vr)
Vr (Vo – Va)
(R1)
R2
=
=
– Rs
kΩ
kΩ
Adjust Up: An increase in the output voltage is obtained
by adding a resistor, R2 between pin 6 (Vo adjust), and pin
4 (-Vout).
Ko
(Va – Vo)
– Rs
Adjust Down: Add a resistor (R1), between pin 6 (Vo ad-
just) and pin 5 (+Vout).
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)
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.
Figure 1
+Vo
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:-
+Vin
(R1)
Adj Down
3
2
5
4
+Vin
+Vout
PT4120/40
–Vin
–Vout
Remote
R2
Adj
Up
On/Off
Vo(adj)
6
20
1
Io(max)
=
A,
or 5A, whichever is less.
–Vin
Va
–Vo
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
24V Bus
Max Current 2
Vo(nom)
Va(min)
Va(max)
Vr
PT4126
PT4146
5A
PT4129
PT4127
PT4147
5A
PT4128
PT4148
5A
PT4121
PT4141
5A
PT4122
PT4142
4A
PT4125
PT4123
PT4143
1.6A
12.0
10.8
13.2
2.5
139.8
110.0
PT4124
PT4144
1.3A
15.0
13.5
16.5
2.5
137.6
90.9
5A
3.8A
5.2V
4.75
5.75
2.5
1.5
1.35
1.65
1.225
67.07
43.2
1.65
1.49
1.81
1.225
63.9
66.5
1.8
1.62
1.98
1.225
69.7
2.5
2.25
2.75
1.225
64.2
3.3
5.0
4.5
5.5
2.5
125.2
187.0
2.95
3.65
1.225
69.3
187.0
Ko (V·kΩ)
Rs (kΩ)
134.7
243.0
110.0
187.0
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes continued
PT4120/4140 Series
Table 2
DC/DC CONVERTER SERIES ADJUSTMENT RESISTOR VALUES
Series Pt #
48V Bus
24V Bus
Vo(nom)
Va(req’d)
PT4126
PT4146
1.5Vdc
PT4127
PT4147
1.8Vdc
PT4128
PT4148
2.5Vdc
PT4121
PT4141
3.3Vdc
PT4122
PT4142
5.0Vdc
PT4123
PT4143
12.0Vdc
PT4124
PT4144
15.0Vdc
Va(req’d)
Va(req’d)
1.35
1.4
1.45
1.5
1.55
1.6
1.65
1.7
1.75
1.8
1.85
1.9
1.95
2.25
2.3
2.35
2.4
2.45
2.5
2.55
2.6
2.65
2.7
2.75
2.95
3.0
3.05
3.1
3.15
3.2
3.25
3.3
(2.8)kΩ
(53.2)kΩ
(204.0)kΩ
4.5
4.55
4.6
4.65
4.7
4.75
4.8
4.85
4.9
4.95
5.0
5.05
5.1
5.15
5.2
(12.6)kΩ
(40.3)kΩ
(75.0)kΩ
(120.0)kΩ
(179.0)kΩ
(262.0)kΩ
(387.0)kΩ
(595.0)kΩ
(1.01)MΩ
10.8
11.0
11.2
11.4
11.6
11.8
12.0
12.2
12.4
12.6
12.8
13.0
13.2
13.5
13.6
13.8
14.0
14.2
14.4
14.6
14.8
15.0
15.2
15.4
15.6
15.8
16.0
16.5
(276.0)kΩ
(365.0)kΩ
(497.0)kΩ
(719.0)kΩ
(1.16)MΩ
1.3MΩ
627.0kΩ
404.0kΩ
(51.7)kΩ
(161.0)kΩ
(489.0)kΩ
588.0kΩ
239.0kΩ
123.0kΩ
64.6kΩ
29.7kΩ
6.4kΩ
1.28MΩ
587.0kΩ
355.0kΩ
1.06MΩ
645.0kΩ
437.0kΩ
312.0kΩ
229.0kΩ
169.0kΩ
125.0kΩ
90.2kΩ
(26.5)kΩ
(92.9)kΩ
(203.0)kΩ
(425.0)kΩ
(1.09)MΩ
(312.0)kΩ
(345.0)kΩ
(427.0)kΩ
(542.0)kΩ
(713.0)kΩ
(1.0)MΩ
5.25
5.3
5.35
5.4
5.45
5.5
1.09MΩ
450.0kΩ
237.0kΩ
131.0kΩ
67.7kΩ
(1.57)MΩ
62.4kΩ
597.0kΩ
253.0kΩ
138.0kΩ
81.0kΩ
46.6kΩ
0.8kΩ
(90.7)kΩ
(146.0)kΩ
(224.0)kΩ
(341.0)kΩ
(536.0)kΩ
(926.0)kΩ
(2.09)MΩ
3.35
3.4
3.45
3.5
3.55
3.6
1.19MΩ
502.0kΩ
272.0kΩ
158.0kΩ
88.7kΩ
42.7kΩ
3.65
9.9kΩ
R1 = (Blue)
R2 = Black
For technical support and more information, see inside back cover or visit www.ti.com
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