PT4476N [TI]
100-W 8.5-A Programmable Isolated DC/DC Converter; 100 -W 8.5可编程隔离式DC / DC转换器
| 型号： | PT4476N |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 100-W 8.5-A Programmable Isolated DC/DC Converter |
| 文件： | 总8页 (文件大小：194K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PT4476—24V
100-W 8.5-A Programmable
Isolated DC/DC Converter
SLTS129B
(Revised 6/21/2002)
Features
• Over-Current Protection
• 18V to 36V Input Voltage Range
• Programmable Output Voltage
Range: 6.5V to 17.5V
• Over-Temperature Protection
• Over-Voltage Protection
• Space-Saving Package
• Solderable Copper Case
• Safety Approvals:
• -40° to +85°C Ambient
• 1500 VDC Isolation
• 89% Efficiency
UL 60950
• On/Off Inhibit
• Differential Remote Sense
• 17A Output with PT4493
CSA 22.2 950
VDE EN60950 Pending
Description
Ordering Information
Pin-Out Information
PT 4476o = 6.5 to 17.5 Volts
PT 4493o = 8.5-A Booster
The PT4476 Excalibur™ DC/DC
converter module combines state-of-the-
art power conversion technology with
un-paralleled flexibility. Incorporating
high efficiency and ultra-fast transient
response, these modules provide up to
8.5A of output current over the program-
mable voltage range of 6.5V to 17.5V.
The modules include a number of
inbuilt features to facilitate system
integration. These include a foldback
output current limit, over-temperature
protection, and an inhibit on/off control.
A differential remote sense is also provided
to compensate for voltage drop between
the converter and load.
Pin
Function
Pin
Function
1
+
inV
14
–Vout
2
–Vin
15
16
17
18
19
20
21
22
23
24
25
26
–Vout
3
Inhibit
–Vout
PT Series Suffix
(PT1234x)
4
Vr
Va
†
†
–Vout
Case/Pin
Configuration
O rder
Suffix
Package
Code *
5
–Vout
Vertical
Horizontal
SMD
N
A
C
(EKD)
(EKA)
(EKC)
6
Do not connect
(+)Remote Sense
–Vout
7
(–)Remote Sense
VID0
8
+
+
V
out
* Previously known as package styles 1200,
1210, and 1215.
9
V
out
VID1
10 +Vout
11 +Vout
12 +Vout
13 +Vout
VID2
(Reference the applicable package code draw-
ing for the dimensions and PC board layout)
VID3
VID4
DRV †
For additional output current, one
PT4476 may be operated with up to two
PT4493 compatible booster modules.
Each PT4493 adds an additional 8.5A of
output current capability.
† Pins 4, 5, & 26 are used for booster applications. For
stand-alone operation, leave open circuit.
• Shaded functions indicate those pins that are
referenced to primary-side potential.
Standard Application
+VIN
+VOUT
7
+ Vsns
+ V out
1
2
8-13
+ Vin
–Vin
•
•
•
•
Co = Optional 33µF electrolytic capacitor
PT4476
C
1 = Optional 33µF, 50V electrolytic capacitor
2 = Optional 1µF, 50V ceramic capacitor
L
O
A
D
14-19
-V out
+
+
C
C 1
C2
C o
-Vsns
20
VID0
- VID4
Inhibit
Programming pins, VID0–VID4, are shown
configured for Vo =12V
3
21 22 23 24 25
•
For normal operation, pin 3 (Inhibit) must be
connected to –Vin.
–VIN
–VOUT
PROGRAMMING PINS
For technical support and more information, see inside back cover or visit www.ti.com
PT4476—24V
100-W 8.5-A Programmable
Isolated DC/DC Converter
PT4470 Series Comparison
Programming Information
VID4=1
VID4=0
Vout
Output Voltage
Program Range
Configuration for
Current Sharing
VID3 VID2 VID1 VID0
Vout
Functionality
Regulator
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
10.0V
10.5V
11.0V
11.5V
12.0V
12.5V
13.0V
13.5V
14.0V
14.5V
15.0V
15.5V
16.0V
16.5V
17.0V
17.5V
6.50V
6.75V
7.00V
7.25V
7.50V
7.75V
8.00V
8.25V
8.50V
8.75V
9.00V
9.25V
9.50V
9.75V
10.00V
10.25V
PT 4471
PT 4472
PT 4495
PT 4473
PT 4474
PT 4494
PT 4475
PT 4476
PT 4493
1.3V– 3.5V
N+1 with other PT4471s
With PT4495 boosters
Used only with PT4472
N+1 with other PT4473s
With PT4494 boosters
Used only with PT4474
N+1 with other PT4475s
With PT4493 boosters
Used only with PT4476
Regulator
1.3V– 3.5V
N/A
PT4472 Booster
Regulator
4.6V–5.7V
4.6V–5.7V
N/A
Regulator
PT4474 Booster
Regulator
6.5V– 17.5V
6.5V–17.5V
N/A
#
#
Regulator
PT4476 Booster
#
This specification covers only the PT4476 regulator and PT4493 current booster.
Logic 0 = Connect to (–)Remote Sense, pin 20
Logic 1 = Open circuit (no pull-up resistors)
VID3 & VID4 must not be changed while the unit is operating.
Specifications (Unless otherwise stated, Ta =25°C, Vin =24V, Vo =12V, Co =0µF, and Io =Iomax)
PT4476
Typ
Characteristic
Symbol
Conditions
Min
Max
Units
(1)
Output Current
Io
Vin
Over Vin range
Over Io Range
0
—
24
1
0.5
0.1
0.5
8.5
36
A
Input Voltage Range
Set Point Voltage Tolerance
Temperature Variation
Line Regulation
Load Regulation
Total Output Voltage Variation
18
—
—
—
—
VDC
%Vo
%Vo
%Vo
%Vo
Vo tol
Regtemp
Regline
Regload
∆Votot
1.5
–40° ≤Tcase ≤ +100°C, Io =0
Over Vin range
Over Io range
Includes set-point, line, load,
–40° ≤Tcase ≤ +100°C
—
1
1
—
2
3
%Vo
Efficiency
η
Io =5A
89
—
%
Vo Ripple (pk-pk)
Transient Response
Vr
ttr
∆Vtr
20MHz bandwidth
0.1A/µs load step, 50% to 75% Iomax
Vo over/undershoot
—
—
—
120
N/A
1
150
—
—
mVpp
µs
%Vo
1A/µs load step, 50% to 100% Iomax
Vo over/undershoot
—
—
200
5
—
—
µs
%Vo
Current Limit
Ilim
Vin =18V, ∆Vo = –1%
—
10
—
A
foldback continuous limit
Current Share Tolerance
Over-Voltage Protection
Switching Frequency
Ishr tol
OVP
ƒs
with PT4493 booster
Shutdown and latch off
Over Vin range
—
—
270
—
10
125
300
17
—
—
350
—
%
%Vo
kHz
V
Under-Voltage Lockout
UVLO
Inhibit (Pin 3)
Referenced to –Vin (pin 2)
(2)
Input High Voltage
Input Low Voltage
VIH
VIL
IIL
Iin standby
Cin
Cout
2.5
—
—
–0.2
4
3
—
Open
+0.8
—
10
—
V
–0.5
Input Low Current
—
—
—
0
mA
mA
µF
Standby Input Current
Internal Input Capacitance
External Output Capacitance
pins 3 & 2 connected
Between +Vo and –Vo
10,000
µF
Isolation Voltage
Capacitance
Resistance
Input–output/input–case
Input to output
1500
—
—
—
—
—
V
1100
—
pF
MΩ
Input to output
10
Operating Temperature Range
Over-Temperature Shutdown
Storage Temperature
Reliability
T
OTP
Case temperature, over Vin range
Case temperature, auto reset
—
-40
—
-40
—
110
—
+100 (3)
—
+125
°C
°C
°C
c
T
s
MTBF
Per Bellcore TR-332
6
1.7
—
—
—
—
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
500
G’s
(4)
Mechanical Vibration
—
Mil-Std-883D, Method 2007.2
20-2000Hz, pcb mounted
—
Horizontal
—
—
20
—
—
G’s
Weight
Flammability
—
—
90
grams
Materials meet UL 94V-0
Notes: (1) The maximum output current is limited to 8.5A or 100/VOUT, whichever is less.
(2) The Inhibit (pin 3) has an internal pull-up, which if left open circuit allows the converter to operate when input power is applied. The open-circuit is
limited to 6.5V. Refer to the application notes for interface considerations.
(3) See Safe Operating Area curves or contact the factory for the appropriate derating.
(4) The case pins on through-hole pin configuration (suffix A) must be soldered. For more information see the applicable package outline drawing.
For technical support and more information, see inside back cover or visit www.ti.com
Typical Characteristics
PT4476—24V
100-W 8.5-A Programmable
Isolated DC/DC Converter
Performance Characteristics, Vo =12V (See Note A)
Performance Characteristics, Vo =15V (See Note A)
Efficiency vs Output Current
Efficiency vs Output Current
95
95
90
90
85
85
VIN
VIN
18.0V
18.0V
80
80
24.0V
24.0V
30.0V
36.0V
30.0V
36.0V
75
70
75
70
65
60
65
60
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
Iout (A)
Iout (A)
Power Dissipation vs Output Current
Power Dissipation vs Output Current
18
16
14
12
10
8
14
12
10
8
VIN
36.0V
VIN
36.0V
30.0V
24.0V
18.0V
30.0V
24.0V
18.0V
6
6
4
4
2
2
0
0
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
Iout (A)
Iout (A)
Safe Operating Area, Vo =12V, Vin =24V ( See Note B)
90
Safe Operating Area, Vo =15V, Vin =24V ( See Note B)
90
80
80
Airflow
Airflow
70
70
Nat conv
500LFM
100LFM
400LFM
60
60
200LFM
300LFM
300LFM
200LFM
50
50
400LFM
100LFM
500LFM
Nat conv
40
40
30
20
30
20
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
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
PT4476, PT4493
Notes:
Increasing the Output Current of the PT4476
with the PT4493 Compatible Current Booster
1. Refer to the PT4476 specification table for the
performance of the regulator/booster combination.
The PT4493 is a 8.5-A “Current Booster” module
designed specifically for the PT4476 programmable
DC/DC converter. The booster is controlled directly
by the regulator, and effectively adds an additional
output stage that operates in parallel. This allows
the system to run sychronously, providing a low
noise solution. Up to two booster modules can be
connected to a PT4476 converter. Each booster
module increases the available output current by 8.5A.
A combination of one PT4476 converter and two
PT4493 booster modules can supply up to 25.5A of
output current; enough power to supply a moderately
sized rack-mounted system. Figure 1-1 shows the
connection schematic for the regulator and current
booster combination.
2. The pin-out of the current booster modules include a
number pins identified, “Do not connect” (see Table 1-1).
These pins are not connected internally to the module
but must be soldered to a pad to preserve the unit’s
mechanical integrity.
3. A minimum of 33µF of output capacitance is required
across the output of each PT4493 booster for proper
operation. A value greater than 33µF will further
reduce transients due to large and/or fast load steps.
4. T he converter and all boosters must be located on
the same printed circuit board. A similar footprint
and trace layout for each module will also facilitate
current sharing.
Table 1-1; Booster Pin-Out Information
A current booster is not a stand-alone product, and
can only operate with a regulator. It is housed in
the same package as its compatible regulator, and
shares the same mechanical outline. Except for an
increase in output current, the overall performance
of a converter/booster combination is identical to
that of a stand-alone converter.
Pin Function
Pin Function
10 +Vout
11 +Vout
12 +Vout
13 +Vout
14 –Vout
15 –Vout
16 –Vout
17 –Vout
18 –Vout
Pin Function
19 –Vout
20 (–)Vsense
21 Do not connect
22 Do not connect
23 Do not connect
24 Do not connect
25 Do not connect
26 DRV
1
2
3
4
5
6
7
8
9
+
–Vin
inV
Do not connect
Vr
Va
Do not connect
Do not connect
+
+
V
out
V
out
Figure 1-1; Current Booster Application Schematic
PROGRAMMING PINS
VID0
VID1
VID2
VID3
VID4
REMOTE SENSE (+)
25 24 23 22 21
7
+VOUT
+VIN
1
8 - 13
PT4476
2
3
4 5 26 20 14-19
CIN
33µF
COUT
33µF
+
+
LOAD
Optional
Optional
Inhibit
-VOUT
–VIN
REMOTE SENSE (-)
4
5 26 20
1
8 - 13
PT4493
2
14 - 19
CIN
33µF
Optional
COUT
33µF
+
+
Required 3
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT4470, PT4480 Series
Operating Features of the PT4470 and PT4480
Series of Isolated DC/DC Converters
Over-Temperature Protection
Over-temperature protection is provided by an internal
temperature sensor, which closely monitors the tempera-
ture of the converter’s metal case. If the case temperature
exceeds the specified limit (see applicable data sheet),
the converter will shut down. The converter will then
automatically restart when the sensed temperature drops
by about 10°C. When operated outside its recommended
thermal derating envelope (see data sheet SOA curves),
the converter will typcially cycle on and off at intervals
from a few seconds to one or two minutes. This is to ensure
that the internal components are not permanently damaged
from excessive thermal stress.
Under-Voltage Lockout
An Under-Voltage Lock-Out (UVLO) inhibits the
operation of the converter until the input voltage is
above the UVLO threshold (see the applicable data
sheet specification). Below this voltage, the module’s
output is held off, irrespective of the state of the Inhibit
control (pin 3). If the Inhibit control is connected to –Vin
(pin 2), the module will automatically power up when
the input voltage rises above the UVLO threshold. The
UVLO allows the module to produce a clean transition
during both power-up and power-down, even when the
input voltage is rising or falling slowly. It also reduces
the high start-up current during normal power-up of
the converter, and minimizes the current drain from the
input source during low-input voltage conditions. The
UVLO threshold includes about 2V of hysteresis. Once
operational, the converter will conform to its operating
specifications when the minimum specified input voltage
is reached.
Primary-Secondary Isolation
Electrical isolation is provided between the input terminals
(primary) and the output terminals (secondary). All con-
verters are production tested to a primary-secondary
withstand voltage of 1500VDC. This specification com-
plies with UL60950 and EN60950 and the requirements
for operational isolation. Operational isolation allows
these converters to be configured for either a positive or
negative input voltage source. The data sheet ‘Pin-Out
Information’ uses shading to indicate which pins are
associated with the primary. They include pins 1 through
5, inclusive.
Over-Current Protection
To protect against load faults, the PT4470/80 series of
DC/DC converters incorporate an output current limit.
Once the load current drawn from the module reaches
the current limit threshold, any attempt by the load to
draw additional current will result in a significant drop
in the module’s regulated output voltage. The current
limit circuitry incorporates a limited amount of foldback.
This has the effect of slightly reducing the output current
from the module when supplying an absolute short circuit.
Upon removal of the load fault, the output voltage from
the converter will automatically recover to its programmed
regulation voltage.
Fuse Recommendations
If desired, an input fuse may be added to protect against
the application of a reverse input voltage.
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 chart (see converter specifica-
tions). The recommended direction for airflow is into
the longest side of the module’s metal case. See Figure 1.
Output Over-Voltage Protection
The PT4470/80 series of DC/DC converters incorporate
circuitry that continually senses the output for an over-
voltage (OV) condition. The OV threshold automatically
tracks the VID output voltage program setting to a level
25% higher than that programmed at the control pins,
VID0 through VID4. If the converter output voltage
exceeds the OV threshold, the converter is immediately
shut down and remains in a latched-off state. To resume
normal operation the converter must be actively reset.
This is accomplished by either cycling the status of the
Inhibit control (pin 3) from “On” to “Off” and then back
“On” again, or by momentarily removing the input power
to the converter. For failsafe operation and redundancy,
the OV protection uses circuitry that is independent of
the converter’s internal feedback loop.
Figure 1
Recommended direction for airflow is
into (perpendicular to) the longest side.
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT4470, PT4480 Series
Using the Inhibit Function on the PT4470 &
PT4480 Series of Isolated DC/DC Converters
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.
The PT4470/44480 series of DC/DC converters incor-
porate an On/Off Inhibit function. This function may be
used in applications that demand battery conservation,
power-up/shutdown sequencing, and/or to coordinate
power-up for active in-rush current control.
Figure 2-1
The On/Off feature is provided by the Inhibit control,
pin 3. The Inhibit pin of the PT4470/4480 series of
converters is an active low enable. The pin must be
either connected, or actively pulled low, to –Vin (pin 2)
to enable the converter output (see standard applica-
tion schematic). When pins 2 & 3 are connected, the
converter provides a regulated output whenever a valid
source voltage is applied between +Vin (pin 1), and –Vin
(pin 2). If pin 3 is disconnected, or allowed to become
high impedance, the regulator output will be disabled.
+VIN
+2.5V
7
+Vsns
1
2
8-13
+Vout
+Vin
PT4472
14-19
–Vin
-Vout
+
C1
-Vsns
VID0
- VID4
Inhibit
3
21 22 23 24 25
20
0V
Q1
BSS138
1
=Enable
3
PROGRAMMING PINS
–VIN
5
Table 2-1 provides details of the interface requirements
Turn-On Time: With input power applied, the converter
typically produces a fully regulated output voltage within
25ms after applying a low-voltage signal to the Inhibit
control 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 2-1, Figure 2-2 shows the typical output voltage
and input current waveforms of a PT4472 after Q1 is
turned on. The turn on of Q1 correlates to the fall in
Vinh. The output voltage was set to 2.5V. The waveform
was measured with a 48-Vdc input voltage, and 15-A load
current.
for the Inhibit pin. Figure 2-1 shows how a discrete
4
MOSFET (Q1) , may be referenced to –Vin and used to
control the input.
Table 2-1 Inhibit Control Requirements
Parameter
Min
Max
Enable (VIH
)
–0.5V
2.5V
0.8V
(Open Circuit)
Disable (VIL
)
Notes:
1. The Inhibit control uses –Vin (pin 2), on the primary side
of the converter, as its ground reference. All voltages
specified are with respect to –Vin.
Figure 2-2
2. The internal circuitry is simple pull-up resistor. The
open-circuit voltage may be as high as 6.5Vdc.
3. These converters incorporate an “Under-Voltage
Lockout” (UVLO) function. This function automatically
disables the converter output until there is sufficient input
voltage to produce a regulated output. Table 2 gives the
applicable UVLO thresholds.
Vout (1V/Div)
Table 2-2 UVLO Thresholds 1
Iin (2A/Div)
Series
UVLO Threshold
Vin Range
PT4470
PT4480
17.0V Typical
34.5V Typical
18 – 36V
36 – 75V
Vinh (5V/Div)
4. The Inhibit input must be controlled with an open-
collector (or open-drain) discrete transistor or
MOSFET. Do not use a pull-up resistor.
HORIZ SCALE: 5ms/Div
5. When the converter output is disabled, the current
drawn from the input supply is typically reduced to
4mA (10mA maximum).
For technical support and more information, see inside back cover or visit www.ti.com
PACKAGE OPTION ADDENDUM
www.ti.com
18-Oct-2005
PACKAGING INFORMATION
Orderable Device
PT4476A
Status (1)
ACTIVE
ACTIVE
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
Drawing
SIP MOD
ULE
EKA
26
6
TBD
Call TI
Level-1-215C-UNLIM
PT4476C
SIP MOD
ULE
EKC
26
6
TBD
Call TI
Level-3-215C-168HRS
(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) 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.
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.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 1
IMPORTANT NOTICE
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Following are URLs where you can obtain information on other Texas Instruments products and application
solutions:
Products
Applications
Audio
Amplifiers
amplifier.ti.com
www.ti.com/audio
Data Converters
dataconverter.ti.com
Automotive
www.ti.com/automotive
DSP
dsp.ti.com
Broadband
Digital Control
Military
www.ti.com/broadband
www.ti.com/digitalcontrol
www.ti.com/military
Interface
Logic
interface.ti.com
logic.ti.com
Power Mgmt
Microcontrollers
power.ti.com
Optical Networking
Security
www.ti.com/opticalnetwork
www.ti.com/security
www.ti.com/telephony
www.ti.com/video
microcontroller.ti.com
Telephony
Video & Imaging
Wireless
www.ti.com/wireless
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