Texas Instruments 的 PT4520 Series 规格书

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Standard Application
Features
•Input Voltage Range:
36V to 75V
•20W Rated
• Output Voltages: 1.2V to 15V
•82% Efficiency
•1500 VDC Isolation
•Low Profile (8.5 mm)
•Adjustable Output Voltage
PT4520 Series
20-W 48-V Input Isolated
DC/DC Converter
PT4520 LOAD
4, 5
2, 3
1
9, 10
7, 8
11
612 Remote Sense (–)
Remote Sense (+)
+VOUT
–VOUT
VOAdj
+VIN
–VIN
Remote
On/Off Q1
BSS138
SLTS148B - JUNE 2000 - REVISED OCTOBER 2002
Ordering Information
PT4521H = 3.3V/5A (16.5W)
PT4522H = 5.0V/4A
PT4523H = 12V/1.6A
PT4524H = 15V/1.3A
PT4526H = 1.5V/5A (7.5W)
PT4527H = 1.8V/5A (9W)
PT4528H = 2.5V/5A (12.5W)
PT4529H = 1.2V/5A (6W)
Pin-Out Information
Pin Function
1 Remote On/Off *
2–V
in
3–V
in
4+V
in
5+V
in
6 Remote Sense (–)
7 –Vout
8 –Vout
9 +Vout
10 +Vout
11 Remote Sense (+)
12 Vout Adjust *
* For further information, see
application notes.
Description
The PT4520 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.
The PT4520 series is electrically equivalent
to the popular PT4120 series and requires no
additional components for proper operation.
•Remote On/Off
•Differential Remote Sense
•Short Circuit Protection
•Over Temperature Shutdown
•Space Saving Package:
1.0 sq. in. PCB Area (Suffix N)
•Safety Approvals Pending
•4×106 Hrs MTBF
PT Series Suffix (PT1234x)
Case/Pin Order Package
Configuration Suffix Code
Vertical N(ELJ)
Horizontal A(ELK)
SMD C(ELL)
(Reference the applicable package code draw-
ing for the dimensions and PC board layout)
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PT4520 Series
20-W 48-V Input Isolated
DC/DC Converter
Specifications (Unless otherwise stated, Ta =25°C, Vin =48V, Cout =0µF, and Io =Iomax)
PT4520 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
Vo ≤ 3.3V 0.1 (1) —5
Input Voltage Range Vin Over Io Range 36 48 75 VDC
Set-Point Voltage Tolerance Vo tol — ±1 ±1.5 (2) %Vo
Temperature Variation Regtemp –40° ≤Ta ≤ +85°C, Io =Iomin — ±0.5 — %Vo
Line Regulation Regline Over Vin range — ±0.2 ±1 %Vo
Load Regulation Regload Over Io range — ±0.4 ±1 (2) %Vo
Total Output Voltage Variation ∆Votot Includes set-point, line, load, —±2±3
(2) %Vo
–40° ≤Ta ≤ +85°C
Efficiency ηVo = 15V — 86 —
Vo = 12V — 83 —
Vo =5.0V — 82 —
Vo =3.3V — 78 — %
Vo =1.8V — 67 —
Vo =1.5V — 65 —
Vo =1.2V — 59 —
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 — %Vo
Vo ≤ 3.3V — ±150 — mV
Current Limit Threshold Ilim Vin =36V, ∆Vo = –50mV — 200 — %Iomax
Output Voltage Adjust Vo adj — ±10 — %
Switching Frequency ƒsOver Vin range Vo ≥ 5.0V 600 650 700 kHz
Vo ≤ 3.3V 800 850 900
Under-Voltage Lockout UVLO — 31 — V
Remote On/Off (Pin 1) Referenced to –Vin (pin 2)
High-Level Input Voltage VIH 2.5 — Open (3) V
Low-Level Input Voltage VIL –0.2 — 0.8
Low-Level Input Current IIL — –10 – µA
Standby Input Current Iin standby pins 1 & 2 connected — 7 10 mA
Internal Input Capacitance Cin — 0.5 — µF
External Output Capacitance Cout 0 — 220 (4) µF
Isolation Voltage Input–output/input–case 1500 — — V
Capacitance Input to output — 1100 — pF
Resistance Input to output 10 — — MΩ
Operating Temperature Range TaOver Vin range –40 — 85 (5) °C
Solder Reflow Temperature Treflow Surface temperature of module pins or case — — 215 (6) °C
Storage Temperature Ts— –40 — 125 °C
Reliability MTBF Per Bellcore TR-332 4 — — 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 — Mil-Std-883D, method 2007.2, Suffix N — 20 (7) —G’s
20-2000Hz , soldered Suffixes A & C — 20 (7) —
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 (pin 1) has an internal pull-up, and if it is left open circuit the PT4520 will operate when input power is applied. Refer to the
application notes for interface considerations.
(4) External output capacitance is not required for proper operation. Capacitamce may be added to improve the response to load transients. The maximum
total capacitance (including the load circuit) must not exceed 220µF, and the combined ESR of must not be less than 100m
Ω
.
(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 temperatures above a peak of 215°C. For
further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Mount Products,” (SLTA051).
(7) The case pins on the through-hole package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing.
SLTS148B - JUNE 2000 - REVISED OCTOBER 2002
*9 TEXAS INSTRUMENTS
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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
Efficiency vs Output Current
Ripple vs Output Current
Power Dissipation vs Output Current
PT4521, 3.3 VDC (See Note A)
Safe Operating Area, Vin =48V (See Note B)
Typical Characteristics
PT4520 Series
20-W 48-V Input Isolated
DC/DC Converter
50
60
70
80
90
0 0.4 0.8 1.2 1.6
Iout (A)
Efficiency - %
36.0V
48.0V
60.0V
72.0V
VIN
0
10
20
30
40
50
0 0.4 0.8 1.2 1.6
Iout (A)
Ripple - mV
72.0V
60.0V
48.0V
36.0V
VIN
50
60
70
80
90
01234
Iout (A)
Efficiency - %
36.0V
48.0V
60.0V
72.0V
VIN
0
1
2
3
4
5
6
01234
Iout (A)
Pd - Watts
72.0V
60.0V
48.0V
36.0V
VIN
50
60
70
80
90
012345
Iout (A)
Efficiency - %
36.0V
48.0V
60.0V
72.0V
VIN
0
10
20
30
40
50
012345
Iout (A)
Ripple - mV
72.0V
60.0V
48.0V
36.0V
VIN
0
1
2
3
4
5
6
012345
Iout (A)
Pd - Watts
72.0V
60.0V
48.0V
36.0V
VIN
PT4522, 5 VDC (See Note A) PT4523, 12 VDC (See Note A)
Efficiency vs Output Current Efficiency vs Output Current
Ripple vs Output Current Ripple vs Output Current
Power Dissipation vs Output Current Power Dissipation vs Output Current
0
10
20
30
40
50
01234
Iout (A)
Ripple - mV
72.0V
60.0V
48.0V
36.0V
VIN
0
1
2
3
4
5
6
0 0.4 0.8 1.2 1.6
Iout (A)
Pd - Watts
72.0V
60.0V
48.0V
36.0V
VIN
20
30
40
50
60
70
80
90
012345
Iout (A)
Ambient Temperature (°C)
300LFM
200LFM
100LFM
Nat conv
Airflow
20
30
40
50
60
70
80
90
01234
Iout (A)
Ambient Temperature (°C)
300LFM
200LFM
100LFM
Nat conv
Airflow
Safe Operating Area, Vin =48V (See Note B) Safe Operating Area, Vin =48V (See Note B)
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)
300LFM
200LFM
100LFM
Nat conv
Airflow
SLTS148B - JUNE 2000 - REVISED OCTOBER 2002
W TEXAS INSTRUMENTS
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.
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.
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 31V Typical 36 – 75V
PT4500 16.5V Typical 18 – 40V
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.
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.
Tfl H [ \ LEA *9 TEXAS INSTRUMENTS
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
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
from the secondary side of the regulator1 with a single
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).
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).
Adjust Down: Add a resistor (R1), between Vo Adjust (pin 12),
and +Vout (pin 9, 10).
Refer to Figure 2-1 and Table 2-2 for both the placement
and value of the required resistor, (R1) or R2.
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.
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.
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 module as
possible.
Table 2-1
DC/DC CONVERTER ADJUSTMENT RANGE AND FORMULA PARAMETERS
Series Pt #
48V Bus PT4529 PT4526 PT4527 PT4528 PT4521 PT4522 PT4523 PT4524
24V Bus PT4509 PT4506 PT4507 PT4508 PT4501 PT4502 PT4503 PT4504
Max Current 25A 5A 5A 5A 5A 4A 1.6A 1.3A
Vo(nom) 1.2 1.5 1.8 2.5 3.3 5.0 12.0 15.0
Va(min) 1.05 1.35 1.62 2.25 2.95 4.5 10.8 13.5
Va(max) 1.35 1.65 1.98 2.75 3.65 5.5 13.2 16.5
Vr0.6125 1.225 1.225 1.225 1.225 2.5 2.5 2.5
Ko (V·kΩΩ
ΩΩ
Ω)34.66 67.07 69.7 64.2 69.3 125.2 139.8 137.6
Rs (kΩΩ
ΩΩ
Ω)150.0 43.2 110.0 187.0 187.0 187.0 110.0 90.9
Figure 2-1
(R1)
Adj Down
R2
Adjust Up
+V
in
–V
in
+V
o
–V
o
PT4500/4520
+Vout
–Vout
+Vin
–Vin Remote
On/Off V
o
(adj)
1
2, 3
4, 5 9,10
7, 8
12
4. Never connect capacitors to Vo adjust. Any
capacitance added to the Vo adjust control pin will
affect the stability of the converter.
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 2-1)
Ko= Multiplier constant (Table 2-1)
Rs= Internal series resistance (Table 2-1)
PT4500/4520 Series
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Application Notes
continued
PT4522
PT4502
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 PT4529 PT4526 PT4527 PT4528 PT4521
24V Bus PT4509 PT4506 PT4507 PT4508 PT4501
Vo(nom) 1.2Vdc 1.5Vdc 1.8Vdc 2.5Vdc 3.3Vdc
Va(req’d)
1.05 (15.1)kΩ
1.1 (126.0)kΩ
1.15 (458.0)kΩ
1.2
1.25 543.0kΩ
1.3 197.0kΩ
1.35 81.1kΩ(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 (2.09.0)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 2-2
DC/DC CONVERTER SERIES ADJUSTMENT RESISTOR VALUES
Series Pt #
R1 = (Blue) R2 = Black
PT4523 PT4524
PT4503 PT4504
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
PT4500/4520 Series
m *9 TEXAS INSTRUMENTS
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Using the Remote On/Off Function on the PT4500/
PT4520 Series of Isolated DC/DC Converters
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).
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.
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.
Table 3-1 Inhibit Control Requirements 1
Parameter Min Max
Enable (VIH) 2.5V (Open Circuit) 4
Disable (VIL) –0.3V 0.8V
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.
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 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.
5. When the converter output is disabled, the current
drawn from the input supply is typically reduced to
8mA (16mA maximum).
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 3-1
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.
Figure 3-2
+V
in
–V
in
+V
o
–V
o
Q1
BSS138
V
GS
Note 4
PT4500/4520
+Vout
–Vout
+Vin
–Vin Remote
On/Off V
o
(
ad
j)
1
2, 3
4, 5 9,10
7, 8
6
PT4500/4520 Series
Vout (2V/Div)
Iin (0.2A/Div)
Q1 Vgs (10V/Div)
HORIZ. SCALE: 5ms/Div
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