PT4504N [TI]
1-OUTPUT 20W DC-DC REG PWR SUPPLY MODULE, ROHS COMPLIANT PACKAGE-12;
| 型号： | PT4504N |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 1-OUTPUT 20W DC-DC REG PWR SUPPLY MODULE, ROHS COMPLIANT PACKAGE-12 输出元件 |
| 文件： | 总8页 (文件大小：202K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PT4500 Series
20-W 24-V Input Isolated
DC/DC Converter
SLTS153B - JUNE 2000 - REVISED OCTOBER 2002
Features
• Input Voltage Range:
18V to 40V
• On/Off Control
• Differential Remote Sense
• Short Circuit Protection
• Over Temperature Shutdown
• Space Saving Package:
1.0 sq. in. PCB Area (Suffix N)
• 20W Rated
• Output Voltages: 1.2V to 15V
• 82% Efficiency
• 1500 VDC Isolation
• Low Profile (8.5 mm)
• Adjustable Output Voltage
6
• 4×10 Hrs MTBF
Description
Pin-Out Information
Ordering Information
Pin Function
PT4501r = 3.3V/5A (16.5W)
PT4502r = 5.0V/4A
The PT4500 Excalibur™ power modules
are a series of isolated DC/DC converters
housed a new space-saving copper case. The
series includes a number of standard output
voltages ranging from as low as 1.2VDC to
15VDC, each adjustable by up to 10% of
nominal. The modules are ideal for Telecom,
Industrial, Computer, and other distributed
power applications that require input-to-output
isolation.
Using multiple 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.
*
1
Remote On/Off
PT4503r = 12V/1.6A
PT4504r = 15V/1.3A
PT4506r = 1.5V/5A (7.5W)
PT4507r = 1.8V/5A (9W)
PT4508r = 2.5V/5A (12.5W)
PT4509r = 1.2V/5A (6W)
2
–V
in
–V
in
+V
in
+V
in
3
4
5
6
Remote Sense (–)
–Vout
7
8
–Vout
PT Series Suffix
(PT1234x)
9
+Vout
Case/Pin
Order
Package
Configuration
Suffix
Code
10
11
12
+Vout
Vertical
Horizontal
SMD
N
A
C
(ELJ)
(ELK)
(ELL)
Remote Sense (+)
V
Adjust *
out
*
For further information, see
application notes.
(Reference the applicable package code draw-
ing for the dimensions and PC board layout)
The PT4500 series is electrically equivalent
to the popular PT4140 series and requires no
additional components for proper operation.
Standard Application
Remote Sense (+)
11
+VOUT
9, 10
+VIN
4, 5
LOAD
PT4500
–VIN
2, 3
–VOUT
7, 8
1
12
6
Remote Sense (–)
VOAdj
Remote
On/Off
Q1
BSS138
For technical support and more information, see inside back cover or visit www.ti.com
PT4500 Series
20-W 24-V Input Isolated
DC/DC Converter
SLTS153B - JUNE 2000 - REVISED OCTOBER 2002
Specifications (Unless otherwise stated, Ta =25°C, Vin =24V, Cout =0µF, and Io =Iomax)
PT4500 SERIES
Characteristic
Symbol
Conditions
Min
Typ
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
0.1 (1)
A
(1)
0.1
(1)
0.1
5
Input Voltage Range
Set Point Voltage Tolerance
Temperature Variation
Line Regulation
Vin
Over Io Range
18
—
—
—
—
—
24
1
0.5
0.2
0.4
13
40
1.5
—
1
1
33
VDC
%Vo
%Vo
%Vo
%Vo
mV
(2)
Vo tol
Regtemp
Regline
Regload
–40° ≤Ta ≤ +85°C, Io =Iomin
Over Vin range
Over Io range
(2)
(2)
Load Regulation
Vo ≥5.0V
Vo ≤3.3V
Total Output Voltage Variation
Efficiency
∆Votot
Includes set-point, line, load,
–40° ≤Ta ≤ +85°C
—
2
3
%Vo
η
Vo = 15V
Vo = 12V
Vo=5.0V
Vo=3.3V
Vo=1.8V
Vo=1.5V
Vo=1.2V
—
—
—
—
—
—
—
86
83
82
79
67
65
59
—
—
—
—
—
—
—
%
Vo Ripple (pk-pk)
Vr
20MHz bandwidth
Vo ≥5.0V
Vo ≤3.3V
—
—
—
—
—
—
—
0.5
15
100
3
150
200
10
650
850
—
—
—
—
—
—
—
%Vo
mVpp
µs
%Vo
mV
Transient Response
ttr
0.1A/µs load step, 50% to 100% Iomax
Vo over/undershoot
Vo ≥5.0V
Vo ≤3.3V
∆Vtr
Current Limit Threshold
Output Voltage Adjust
Switching
Ilim
Vo adj
Frequencyƒs
Vin =18V, ∆Vo = –1%
%Iomax
%
Over Vin range
Vo ≥5.0V
Vo ≤3.3V
600
800
—
700
900
—
kHz
V
Under-Voltage Lockout
UVLO
16.5
Remote On/Off (Pin 1)
High-Level Input Voltage
Low-Level Input Voltage
Low-Level Input Current
Referenced to –Vin (pin 2)
(3)
VIH
VIL
IIL
2.5
—
—
–10
Open
0.8
–
V
–0.2
—
µA
Standby Input Current
Internal Input Capacitance
External Output Capacitance
Iin
Cin
Cout
standbypins
1
&
2
connected
—
—
7
10
—
0
0.5
—
µF
µF
(4)
220
Isolation Voltage
Capacitance
Resistance
Input–output/input–case
Input to output
1500
—
—
—
—
—
V
1100
—
pF
MΩ
Input to output
10
(5)
Operating Temperature Range
Solder Reflow Temperature
Storage Temperature
T
Treflow
T
s
Over Vin range
Surface temperature of module pins or case
—
–40
—
–40
—
—
—
85
215
125
°C
°C
°C
a
(6)
ReliabilityMTBF
Mechanical Shock
Mechanical Vibration
Per
Bellcore
TR-332
6
4
—
—
10 Hrs
50% stress, Ta =40°C, ground benign
—
—
—
Per Mil-Std-883D, method 2002.3,
1mS, half-sine, mounted to a fixture
Mil-Std-883D, Method 2007.2
20-2000Hz, soldered
—
500
—
G’s
(7)
(7)
Suffix N
Suffix A, C
—
—
—
20
—
—
—
G’s
20
Weight
—
23
grams
Flammability—
Materials
meet
UL
94V-0
Notes: (1)The DC/DC converter will operate at no load with reduced specifications.
(2) For optimum voltage accuracy the ‘Remote Sense (+)’ and ‘Remote Sense (–)’ pins must be connected to +Vout and –Vout respectively.
(3)The Remote On/Off control (pin 1) has an internal pull-up. If pin
1 is left open the PT4500 will operataeppwliehde.nA isnmpaultl lopwow- er is
leakage (<100nA) MOSFET must be used to control this input. The open-circuit voltage is less than 10V. See application notes for further information.
(4)External output capacitance is not required for proper operation. Capacitamce may be added to improve threanrsieesnpotsn.sTe hetomaloxaimd umt
total capacitance (including the load circuit) must not exceed 220µF, and the combined ESR of must not be less than 100mΩ.
(5)See Safe Operating Area curves or contact the factory for the appropriate derating.
(6)During solder reflow of SMD package version do not elevate the module case, pins, or internal component tpeemakpeorfa2tu1r5e°sC.aFbovre
further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Mount Products,” (SLTA051).
a
(7)The case pins on the through-hole package types (suffixes
N & A) must be soldered. For more informationacksaegee otuhtelinaepdprliacwabilneg. p
For technical support and more information, see inside back cover or visit www.ti.com
Typical Characteristics
PT4500 Series
20-W 24-V Input Isolated
DC/DC Converter
SLTS153B - JUNE 2000 - REVISED OCTOBER 2002
PT4502, 5 VDC (See Note A)
PT4501, 3.3 VDC (See Note A)
PT4503, 12 VDC (See Note A)
Efficiency vs Output Current
Efficiency vs Output Current
Efficiency vs Output Current
90
80
70
60
50
90
80
70
60
50
90
VIN
VIN
VIN
80
70
60
50
18.0V
24.0V
30.0V
36.0V
18.0V
24.0V
30.0V
36.0V
18.0V
24.0V
30.0V
36.0V
0
1
2
3
4
5
0
1
2
3
4
0
0.4
0.8
1.2
1.6
Iout (A)
Iout (A)
Iout (A)
Ripple vs Output Current
Ripple vs Output Current
Ripple vs Output Current
50
40
30
20
10
0
50
40
30
20
10
0
50
40
30
20
10
0
VIN
VIN
VIN
36.0V
30.0V
24.0V
18.0V
36.0V
30.0V
24.0V
18.0V
36.0V
30.0V
24.0V
18.0V
0
1
2
3
4
5
0
1
2
3
4
0
0.4
0.8
1.2
1.6
Iout (A)
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
36.0V
30.0V
24.0V
18.0V
36.0V
30.0V
24.0V
18.0V
18.0V
24.0V
30.0V
36.0V
0
1
2
3
4
5
0
1
2
3
4
0
0.4
0.8
1.2
1.6
Iout (A)
Iout (A)
Iout (A)
Safe Operating Area, Vin =24V (See Note B)
Safe Operating Area, Vin =24V (See Note B)
Safe Operating Area, Vin =24V (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
300LFM
200LFM
100LFM
Nat conv
300LFM
200LFM
100LFM
Nat conv
300LFM
200LFM
100LFM
Nat conv
0
0.3
0.6
0.9
1.2
1.5
0
1
2
3
4
5
0
1
2
3
4
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
PT4500/PT4520 Series
Operating Features and System Considerations for
the PT4500/PT4520 DC/DC Converters
Output Current Limit
The PT4500 and PT4520 series of DC/DC converters
incorporate an output current limit. This protects both the
module and upstream source against load faults. Applying
a load, in excess of the current limit threshold, will sim-
ply cause the output voltage to drop. The output current
remains limited, but continues to flow in the fault. The
drop in output voltage will vary according to the severity
of the fault. Applying a short circuit to the output will
result in an output voltage of zero, and the fault current
will be limited to a value slightly higher than the current
limit threshold. Upon the removal of the load fault, the
output voltage of the module will fully recover to its
normal regulated output voltage.
Turn-On Time
The typical turn-on time is typically 35 milliseconds at
Vin =48V. This is from application of input power, or the
removal of a low-voltage signal from the Remote On/Off
(pin 1). This includes about about 5–10ms of delay time
before the output voltage begins to rise. Turn-on time
will vary slightly with input voltage, output load, and the
total amount of capacitance connected to the output.
Input Current Limiting
The converter is not internally fused. For safety and
overall system protection, the maximum input current to
the converter must be limited. Active or passive current
limiting can be used. Passive current limiting can be a
fast acting fuse. A 125-V fuse, rated no more than 5A, is
recommended. Active current limiting can be imple-
mented with a current limited “Hot-Swap” controller.
Primary-Secondary Isolation
The PT4500 and PT4520 series of DC/DC converters
incorporate electrical isolation between the input termi-
nals (primary) and the output terminals (secondary). All
converters are production tested to a withstand voltage
of 1500VDC. The isolation complies with UL60950 and
EN60950, and the requirements for operational isolation.
This allows the converter to be configured for either a
positive or negative input voltage source.
Thermal Considerations
Airflow may be necessary to ensure that the module can
supply the desired load current in environments with
elevated ambient temperatures. The required airflow
rate may be determined from the Safe Operating Area
(SOA) thermal derating curves. These are provided in
the “Typical Characteristics” section of the converter
specifications.
Output Voltage Adjustment
The output voltage is typcially adjustable over a range of
10% of nominal. Consult the separate application note,
“Ajusting the Output Voltage of the PT4500/PT4520
Series of Isolated DC/DC Converters.”
Remote On/Off Function
The output voltage from the converter can be turned off
from the primary side using the Remote On/Off control
(pin 1). Consult the separate application note, “Using
the Remote On/Off Function on the PT4500/PT4520
Series of Isolated DC/DC Converters.”
Under-Voltage Lock-Out
The Under-Voltage Lock-Out (UVLO) circuit prevents
operation of the converter whenever the input voltage to
the module is insufficient to maintain output regulation.
Below the UVLO threshold the module is off and the
Remote On/Off control (pin 1) is inoperative. Table 1-2
gives the applicable UVLO thresholds.
Table 1-2; UVLO Thresholds
Series
UVLO Threshold
Vin Range
PT4520
PT4500
31V Typical
16.5V Typical
36 – 75V
18 – 40V
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT4500/4520 Series
Adjusting the Output Voltage of the PT4500/
PT4520 Series of Isolated DC/DC Converters
The factory pre-set output voltage of TI’s PT4500 and
PT4520 series of isolated DC/DC converters may be
adjusted within a nominal 10% range. Adjustment is made
4. Never connect capacitors to Vo adjust. Any
capacitance added to the Vo adjust control pin will
affect the stability of the converter.
1
from the secondary side of the regulator with a single
The values of (R1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulas.
external resistor. For the input voltage range specified in
the data sheet Table 2-1 gives the allowable adjustment
range for each model, as Vo (min) and Vo (max).
Ko(Va – Vr)
Vr (Vo – Va)
Adjust Up: An increase in the output voltage is obtained
by adding a resistor, R2 between Vo Adjust (pin 12), and
–Vout (pin 7, 8).
(R1)
R2
=
=
– Rs
kΩ
kΩ
Ko
(Va – Vo)
– Rs
Adjust Down: Add a resistor (R1), between Vo Adjust (pin 12),
and +Vout (pin 9, 10).
Where Vo = Original output voltage
Va = Adjusted output voltage
Refer to Figure 2-1 and Table 2-2 for both the placement
and value of the required resistor, (R1) or R2.
Vr = Reference voltage (Table 2-1)
Ko = Multiplier constant (Table 2-1)
Rs = Internal series resistance (Table 2-1)
Notes:
1. The PT4500 and PT4520 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 2-1
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 2-1). The revised maximum
output current must be determined as follows.
+V o
+Vin
(R1)
Adj Down
4, 5
2, 3
9,10
7, 8
+Vin
+Vout
PT4500/4520
20
–Vin
–Vout
Io(max)
=
A,
or 5A, whichever is less.
Remote
V
o (adj)
12
Va
R2
Adjust Up
On/Off
1
Where Va is the adjusted ouput voltage.
–Vin
–Vo
3. Use only a single 1% resistor in either the (R1) or R2
location. Place the resistor as close to the module as
possible.
Table 2-1
DC/DC CONVERTER ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt #
48V Bus
24V Bus
Max Current 2
Vo(nom)
Va(min)
Va(max)
Vr
PT4529
PT4509
5A
PT4526
PT4506
5A
PT4527
PT4507
5A
PT4528
PT4508
5A
PT4521
PT4501
5A
PT4522
PT4502
4A
PT4523
PT4524
PT4504
1.3A
15.0
13.5
16.5
2.5
137.6
90.9
PT4503
1.6A
12.0
10.8
13.2
2.5
139.8
110.0
1.2
1.05
1.35
0.6125
34.66
150.0
1.5
1.35
1.65
1.225
67.07
43.2
1.8
1.62
1.98
1.225
69.7
2.5
2.25
2.75
1.225
64.2
3.3
2.95
3.65
1.225
69.3
5.0
4.5
5.5
2.5
125.2
187.0
Ko (V·kΩ)
Rs (kΩ)
110.0
187.0
187.0
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes continued
PT4500/4520 Series
Table 2-2
DC/DC CONVERTER SERIES ADJUSTMENT RESISTOR VALUES
Series Pt #
48V Bus
24V Bus
Vo(nom)
Va(req’d)
PT4529
PT4509
1.2Vdc
PT4526
PT4506
1.5Vdc
PT4527
PT4507
1.8Vdc
PT4528
PT4508
2.5Vdc
PT4521
PT4501
3.3Vdc
PT4522
PT4502
5.0Vdc
PT4523
PT4503
12.0Vdc
PT4524
PT4504
15.0Vdc
Va(req’d)
Va(req’d)
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
1.05
1.1
1.15
1.2
1.25
1.3
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
(15.1)kΩ
(126.0)kΩ
(458.0)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
543.0kΩ
197.0kΩ
81.1kΩ
(2.8)kΩ
(53.2)kΩ
(204.0)kΩ
588.0kΩ
239.0kΩ
123.0kΩ
64.6kΩ
29.7kΩ
6.4kΩ
1.3MΩ
627.0kΩ
404.0kΩ
(51.7)kΩ
(161.0)kΩ
(489.0)kΩ
1.06MΩ
645.0kΩ
437.0kΩ
312.0kΩ
229.0kΩ
169.0kΩ
125.0kΩ
90.2kΩ
(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
1.28MΩ
587.0kΩ
355.0kΩ
(26.5)kΩ
(92.9)kΩ
(203.0)kΩ
(425.0)kΩ
(1.09)MΩ
(1.57)MΩ
62.4kΩ
597.0kΩ
253.0kΩ
138.0kΩ
81.0kΩ
46.6kΩ
0.8kΩ
1.09MΩ
450.0kΩ
237.0kΩ
131.0kΩ
67.7kΩ
(90.7)kΩ
(146.0)kΩ
(224.0)kΩ
(341.0)kΩ
(536.0)kΩ
(926.0)kΩ
(2.09.0)MΩ
3.15
3.2
3.25
3.3
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
Application Notes
PT4500/4520 Series
Using the Remote On/Off Function on the PT4500/
PT4520 Series of Isolated DC/DC Converters
Figure 3-1
For applications requiring output voltage on/off control,
the PT4500/4520 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 coordinate the power-up
of the regulator for active in-rush current control. (See
the related application note, SLTA021).
+V o
4, 5
2, 3
9,10
7, 8
+Vin
+Vout
+Vin
PT4500/4520
–Vin
–Vout
Remote
V
o (adj)
6
On/Off
1
–Vo
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
applied between +Vin(pin 4, 5), and –Vin (pin 2, 3).
Connecting pin 1 to pin 2, or applying a low-level signal
to pin 1 (with respect to –Vin), 1 will disable the regulator
output 5.
Q1
BSS138
VGS
Note
4
–Vin
Table 3-1 provides details of the interface requirements
for the Remote On/Off pin. Figure 3-1 shows how a discrete
MOSFET (Q1), may be referenced to the negative input
voltage rail and used with this control input.
Turn-On Time: The converter typically produces a fully
regulated output voltage within 35ms after the removal
of the low voltage signal from the Remote On/Off pin.
Using the circuit of Figure 3-1, Figure 3-2 shows the
output voltage and input current waveforms of a PT4521
after Q1 is turned off. The turn off of Q1 corresponds to
the drop in Q1 Vgs voltage. The waveforms were mea-
sured with a 48Vdc input voltage, and 2.75-A resistive
load.
Table 3-1 Inhibit Control Requirements 1
Parameter
Min
Max
Enable (VIH
)
2.5V
–0.3V
(Open Circuit) 4
0.8V
Disable (VIL
)
Notes:
1. The on/off control uses -Vin (pin 1), on the primary
side of the converter, as its ground reference. All
voltages specified are with respect to -Vin.
Figure 3-2
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.
Vout (2V/Div)
Iin (0.2A/Div)
3. The PT4500/20 series incorporates an “Under-Voltage
Lockout” (UVLO) function. The UVLO prevents
operation of the converter when there is sufficient input
voltage to support a regulated output. Below the UVLO
threshold voltage, there is no output from the module
and the Remote On/Off control is inoperative.
4. The Remote On/Off input of the PT4500/20 series
must be controlled with a low-leakage (<100nA) open-
drain 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
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.
For technical support and more information, see inside back cover or visit www.ti.com
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