PT4411 [TI]
Programmable Output Voltage;
| 型号： | PT4411 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | Programmable Output Voltage |
| 文件： | 总10页 (文件大小：244K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PT4410 Series
100-Watt 48-V Input
Isolated DC/DC Converter
SLTS170C - JULY 2002 - REVISED JUNE 2003
Features
• Input Voltage Range:
• Undervoltage Lockout
36 V to 75 V
• Low Profile Package (12mm)
• Compact Footprint Comparable
to ¼-Brick: (Horiz Config. 1.45 in
• Programmable Output Voltage
• +90 % Efficiency
• 1500 VDC Isolation
2
× 2.6 in, Vertical Config. < 1 in )
• On/Off Control
• Surface Mountable
• Agency Approvals:
UL 60950, CSA 22.2 950
• IPC Lead Free 2
• Over-Current Protection
• Differential Remote Sense
• Output Over-Voltage Protection
• Over-Temperature Shutdown
Description
Ordering Information
Pin-Out Information
The PT4410 series of power modules are single-
output isolated DC/DC converters, housed in a
compact 21-pin low-profile (12 mm) package.
These modules are rated up to 100W with load
currents as high as 30 A. The output voltage is set
within a pre-defined range via a 5-bit input code.
The PT4410 series operates from a standard
48-V telecom CO supply and occupies only 3.9 in²
of PCB area. These modules offer OEMs a compact
and flexible high-output power source for use with
high-end microprocessors, DSPs, general purpose
logic and analog. They are suitable for distributed
power applications in both telecom and computing
environments.
Features include output over-current protection,
on/off control, output over-voltage protection
(OVP), over-temperature shutdown, under-volt-
age lockout (UVLO), and an output differential
remote sense. The modules are fully integrated
for stand-alone operation, and require no additional
components. The horizontal package outline is also
comparable to industry standard ¼-bricks, allowing
for a dual PWB layout.
PT4411r = 1.3 to 3.5 Volts
PT4412r = 1.05 to 1.75Volts
PT4413r = 3.4 to 5.7 Volts
Pin Function
1
2
3
4
5
6
7
8
9
Remote On/Off *
-V
in
-V
in
+V
+V
in
in
Pin Not Present
VID 0
VID 1
PT Series Suffix
(PT1234x)
Case/Pin
Order
Package
Code
Configuration
Suffix
VID 2
Vertical
Horizontal
SMD
N
A
C
(ENM)
(ENN)
(ENP)
10 VID 3
11 VID 4 †
12 (–)Remote Sense
(Reference the applicable package code drawing for
the dimensions and PC layout)
13 -V
o
14 -V
o
15 -V
o
16 -V
o
17 +V
o
18 +V
o
19 +V
o
20 +V
o
21 (+)Remote Sense
* For more information consult
the applicable application note.
†VID 4 does not function on the
PT4412 & PT4413
Standard Application
+
REMOTE SENSE
+VOUT
21
+ Vsns
+VIN
4,
2,
5
17–20
13–16
+ Vin
–Vin
+ Vout
+
+
L
O
A
D
C IN
100µF
C OUT
330µF
PT4411
3
-Vout
–VIN
Remote
On/Off
–VOUT
-Vsns
12
VID0
-
VID4
9 10 11
1
7
8
–
REMOTE SENSE
Notes:
PROGRAMMING PINS
#
CIN =Optional 100 µF electroliytic capacitor
COUT =Optional 330 µF electrolytic capacitor
# VID programming pins are set for 3.3 V output
For technical support and more information, see inside back cover or visit www.ti.com
PT4410 Series
100-Watt 48-V Input
Isolated DC/DC Converter
SLTS170C - JULY 2002 - REVISED JUNE 2003
Environmental Specifications
Characteristics
Symbols
Conditions
Min
Typ
Max
Units
(i)
Operating Temperature Range
ShutdownTemperature
Solder Reflow Temperature
Storage Temperature
T
OTP
Treflow
Over Vin Range
Case temperature - auto reset
Surface temperature of module pins or case
—
–40
—
—
—
115
—
+85
—
215
°C
°C
°C
°C
a
(ii)
T
s
–40
—
+125
Mechanical Shock
Per Mil-STD-883D, Method 2002.3
1 msec, ½ Sine, mounted
—
500
—
G’s
(iii)
(iii)
Mechanical Vibration
Mil-STD-883D, Method 2007.2
20-2000 Hz, PCB mounted
Vertical
Horizontal
—
—
15
20
—
—
G’s
Weight
Flammability
—
—
Vertical/Horizontal
Meets UL 94V-O
—
50
—
grams
Notes (i) See SOA curves or consult factory for appropriate derating
(ii) 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).
(iii) The case pins on the through-hole package types (suffixes N &A) must be soldered. For more information see the applicable package outline drawing.
Output Voltage Programming Information
PT4412
PT4413
PT4411
VID4= NC
Vout
VID4= NC
Vout
VID4=1 VID4=0
VID3 VID2 VID1 VID0
Vout
Vout
N/D *
1.05 V
1.10 V
1.15 V
1.20 V
1.25 V
1.30 V
1.35 V
1.40 V
1.45 V
1.50 V
1.55 V
1.60 V
1.65 V
1.70 V
1.75 V
N/D *
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
*N/D 1. V 30
2. V 10 1. V 35
2. V 20 1. V 40
2. V 30 1. V 45
2. V 40 1. V 50
2. V 50 1. V 55
2. V 60 1. V 60
2. V 70 1. V 65
2. V 80 1. V 70
2. V 90 1. V 75
3. V 00 1. V 80
3. V 10 1. V 85
3. V 20 1. V 90
3. V 30 1. V 95
3. V 40 2. V 00
3. V 50 2. V 05
3.40 V
3.56 V
3.72 V
3.88 V
4.05 V
4.21 V
4.37 V
4.53 V
4.69 V
4.86 V
5.02 V
5.18 V
5.34 V
5.50 V
5.67 V
Logic 0 =Pin 12 potential; (–)Remote Sense
Logic 1 =Open circuit (no pull-up resistors)
* N/D = Voltage is not defined. The regulator
produces a low-voltage periodic pulse (less
than 1 V) approximately every 10 ms.
Note: During operation, changes to the program code should be limited to 15 % of Vo so as to avoid activating the
output O V protection.
Pin Descriptions
+Vin: The positive input for the module with respect to
–Vin. When powering the module from a –48-V telecom
central office supply, this input is connected to the primary
system ground.
+Vo: The positive power output with respect to -Vo, which
is DC isolated from the input supply pins. If a negative
output voltage is desired, +Vo should be connected to the
secondary circuit common and the output taken from –Vo.
–Vin: The negative input supply for the module, and the
0 VDC reference for the Remote On/Off input. When
powering the module from a +48-V supply, this input is
connected to the 48-V(Return).
–Vo: The negative power output with respect to +Vo,
which is DC isolated from the input supply pins. This
output is normally connected to the secondary circuit
common when a positive output voltage is desired.
Remote On/Off: An open-collector (open-drain) positive
logic input that is referenced to –Vin. Pulling this input
down to –Vin potential disables the module’s output. If
this input is left open-circuit, the module will produce an
output whenever a valid input source is applied.
+Remote Sense: Provides the converter with remote sense
capability to regulate the set-point voltage directly at the
load. When used with –Remote Sense, the regulation
circuitry will compensate for voltage drop between the
converter and the load. The pin may be left open circuit,
but connecting it to +Vo will improve load regulation.
VID0 – VID4: Selects the set-point output voltage of the
converter according to the applicable program code.
VID0 – VID4 must either be connected to (–)Remote
Sense or left open circuit. Note: For the PT4412, VID 4 is
internally disabled and may be left open circuit.
–Remote Sense: This is the logic ‘0’ reference for the
inputs VID0 – VID4, and provides the converter with
remote sense capability when used in conjunction with
+Remote Sense. For optimum output voltage accuracy
this pin should always be connected to –Vo.
For technical support and more information, see inside back cover or visit www.ti.com
PT4411—48 V
100-Watt 48-V Input
Isolated DC/DC Converter
SLTS170C - JULY 2002 - REVISED JUNE 2003
PT4411 Specifications (Unless otherwise stated, Ta =25 °C, Vin =48 V, Vo =3.3 V, Co =0 µF, and Io =Iomax)
PT4411
Characteristic
Symbol
Conditions
Min
Typ
Max
Units
Output Current
Io
Vin
Over Vin range
Over Io Range
0
—
48
0.6 (1)
0.8
1
1
30
75
—
—
—
—
A
V
%Vo
%Vo
mV
mV
Input Voltage Range
Set Point Voltage Tolerance
Temperature Variation
Line Regulation
Load Regulation
Total Output Voltage Variation
36
—
—
—
—
Vo tol
Regtemp
Regline
Regload
∆Votot
–40° >Ta > +85 °C
Over Vin range
Over Io range
Includes set-point, line, load,
–40° >Ta > +85 °C
—
1.6
3
%Vo
Efficiency
Vo Ripple (pk-pk)
Transient Response
η
Io =15 A
20 MHz bandwidth
—
—
—
—
—
—
250
—
91
—
—
—
—
—
—
350
—
%
mVpp
µs
%Vo
A
%Vo
kHz
V
Vr
ttr
∆Vtr
ITRIP
OVP
ƒo
50
75
5
36
125
300
32
1 A/µs load step, 50 % to 100 % Iomax
Vo over/undershoot
Shutdown, followed by auto-recovery
Output shutdown and latch off
Over Vin range
Over-Current Threshold
Output Over-Voltage Protection
Switching Frequency
Under-Voltage Lockout
UVLO
Remote On/Off Input
Input High Voltage
Input Low Voltage
Referenced to –Vin
(2)
VIH
VIL
4.5
—
—
Open
+0.8
V
–0.2
Input Low Current
IIL
Iin standby
Cin
—
—
—
0
–0.3
2
1.
—
—
4
mA
mA
—
Standby Input Current
Internal Input Capacitance
External Output Capacitance
pins 1 & 2 connected
Between +Vo and –Vo
µF
Cout
5,000
µF
Isolation Voltage
Capacitance
Resistance
Input-output & input-case
Input-output
1500
—
—
—
—
—
Vdc
pF
1200
—
Input-output
10
MΩ
Notes: (1) If (–)Remote Sense is not used, pin 12 must be connected to pin 13 for optimum output voltage accuracy.
(2) The Remote On/Off input has an internal pull-up. If it is left open-circuit the module will operate when input power is applied. A discrete MOSFET or
bipolar transistor is recommended to control this input. The open-circuit voltage is typically 5 V. See application notes for interface considerations.
PT4411 Characterstic Data
Power Dissipation vs Load Current; Vo =3.3 V (See Note A)
Efficiency vs Load Current; Vin =48 V (See Note A)
100
90
80
70
60
50
15
12
9
VOUT
VIN
3.3V
2.5V
1.8V
1.5V
75.0V
60.0V
48.0V
36.0V
6
3
0
0
5
10
15
20
25
30
0
5
10
15
20
25
30
Iout (A)
Iout (A)
Output Ripple vs Load Current; Vin =48 V (See Note A)
Safe Operating Area; Vin =48 V (See Note B)
90
80
70
60
50
40
30
20
100
80
60
40
20
0
Airflow
VOUT
400LFM
300LFM
200LFM
100LFM
Nat conv
3.3V
2.5V
1.8V
1.5V
0
5
10
15
20
25
30
0
5
10
15
20
25
30
Iout (A)
Iout (A)
Note A: All data listed in the above graphs has been developed from actual products tested at 25 °C. This data is considered typical data for the DC/DC converter.
Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperature.
For technical support and more information, see inside back cover or visit www.ti.com
PT4412—48 V
100-Watt 48-V Input
Isolated DC/DC Converter
SLTS170C - JULY 2002 - REVISED JUNE 2003
PT4412 Specifications (Unless otherwise stated, Ta =25 °C, Vin =48 V, Vo =1.5 V, Co =0 µF, and Io =Iomax)
PT4412
Characteristic
Symbol
Conditions
Min
Typ
Max
Units
Output Current
Io
Vin
Over Vin range
Over Io Range
0
—
48
0.6
0.8
1
30
75
—
—
—
—
A
V
%Vo
%Vo
mV
mV
Input Voltage Range
Set Point Voltage Tolerance
Temperature Variation
Line Regulation
Load Regulation
Total Output Voltage Variation
36
—
—
—
—
(1)
Vo tol
Regtemp
Regline
Regload
∆Votot
–40° >Ta > +85 °C
Over Vin range
Over Io range
Includes set-point, line, load,
–40° >Ta > +85 °C
1
—
1.6
3
%Vo
Efficiency
Vo Ripple (pk-pk)
Transient Response
η
Io =15 A
20 MHz bandwidth
—
—
—
—
—
—
225
—
86.5
30
75
5
38
125
275
32
—
—
—
—
—
—
325
—
%
mVpp
µs
%Vo
A
%Vo
kHz
V
Vr
ttr
∆Vtr
ITRIP
OVP
ƒo
1 A/µs load step, 50 % to 75 % Iomax
Vo over/undershoot
Shutdown, followed by auto-recovery
Output shutdown and latch off
Over Vin range
Over-Current Threshold
Output Over-Voltage Protection
Switching Frequency
Under-Voltage Lockout
UVLO
Remote On/Off Input
Input High Voltage
Input Low Voltage
Referenced to –Vin
(2)
VIH
VIL
4.5
—
—
Open
+0.8
V
–0.2
Input Low Current
IIL
Iin standby
Cin
—
—
—
0
–0.3
2
1.
—
—
4
mA
mA
—
Standby Input Current
Internal Input Capacitance
External Output Capacitance
pins 1 & 2 connected
Between +Vo and –Vo
µF
Cout
5,000
µF
Isolation Voltage
Capacitance
Resistance
Input-output & input-case
Input-output
1500
—
—
—
—
—
Vdc
pF
1200
—
Input-output
10
MΩ
Notes: (1) If (–)Remote Sense is not used, pin 12 must be connected to pin 13 for optimum output voltage accuracy.
(2) The Remote On/Off input has an internal pull-up. If it is left open-circuit the module will operate when input power is applied. A discrete MOSFET or
bipolar transistor is recommended to control this input. The open-circuit voltage is typically 5 V. See application notes for interface considerations.
PT4412 Characterstic Data
Power Dissipation vs Load Current; Vo =1.5 V (See Note A)
Efficiency vs Load Current; Vin =48 V (See Note A)
100
90
80
70
60
50
12
10
8
VIN
VOUT
1.75V
1.5V
75.0V
60.0V
48.0V
36.0V
6
1.2V
1.05V
4
2
0
0
5
10
15
20
25
30
0
5
10
15
20
25
30
Iout (A)
Iout (A)
Output Ripple vs Load Current; Vin =48 V (See Note A)
Safe Operating Area; Vin =48 V (See Note B)
50
40
30
20
10
0
90
80
70
60
50
40
30
20
VOUT
Airflow
1.75V
1.5V
300LFM
200LFM
100LFM
Nat conv
1.2V
1.05V
0
5
10
15
20
25
30
0
5
10
15
20
25
30
Iout (A)
Iout (A)
Note A: All data listed in the above graphs has been developed from actual products tested at 25 °C. This data is considered typical data for the DC-DC Converter.
Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperature.
For technical support and more information, see inside back cover or visit www.ti.com
PT4413—48 V
100-Watt 48-V Input
Isolated DC/DC Converter
SLTS170C - JULY 2002 - REVISED JUNE 2003
PT4413 Specifications (Unless otherwise stated, Ta =25 °C, Vin =48 V, Vo =5.02 V, Co =0 µF, and Io =Iomax)
PT4413
Typ
Characteristic
Symbol
Conditions
Min
Max
Units
Output Current
Io
Vin
Over Vin range
Over Io Range
0
—
48
0.6
0.8
2
1
20
75
—
—
—
—
A
V
%Vo
%Vo
mV
mV
Input Voltage Range
Set Point Voltage Tolerance
Temperature Variation
Line Regulation
Load Regulation
Total Output Voltage Variation
36
—
—
—
—
(1)
Vo tol
Regtemp
Regline
Regload
∆Votot
–40° >Ta> +85 °C
Over Vin range
Over Io range
Includes set-point, line, load,
–40° >Ta > +85 °C
—
1.6
3
%Vo
Efficiency
Vo Ripple (pk-pk)
Transient Response
η
Io =15 A
20MHz bandwidth
—
—
—
—
—
—
250
—
92
70
75
2
28
125
300
32
—
—
—
—
—
—
350
—
%
mVpp
µs
%Vo
A
%Vo
kHz
V
Vr
ttr
∆Vtr
ITRIP
OVP
ƒo
1 A/µs load step, 50 % to 100 % Iomax
Vo over/undershoot
Shutdown, followed by auto-recovery
Output shutdown and latch off
Over Vin range
Over-Current Threshold
Output Over-Voltage Protection
Switching Frequency
Under-Voltage Lockout
UVLO
Remote On/Off Input
Input High Voltage
Input Low Voltage
Referenced to –Vin
(2)
VIH
VIL
4.5
—
—
Open
+0.8
V
–0.2
Input Low Current
IIL
Iin standby
Cin
—
—
—
0
–0.3
2
1.
—
—
4
mA
mA
—
Standby Input Current
Internal Input Capacitance
External Output Capacitance
pins 1 & 2 connected
Between +Vo and –Vo
µF
Cout
5,000
µF
Isolation Voltage
Capacitance
Resistance
Input-output & input-case
Input-output
1500
—
—
—
—
—
Vdc
pF
1200
—
Input-output
10
MΩ
Notes: (1) If (–)Remote Sense is not used, pin 12 must be connected to pin 13 for optimum output voltage accuracy.
(2) The Remote On/Off input has an internal pull-up. If it is left open-circuit the module will operate when input power is applied. A discrete MOSFET or
bipolar transistor is recommended to control this input. The open-circuit voltage is typically 5 V. See application notes for interface considerations.
PT4413 Characterstic Data
Power Dissipation vs Load; VOUT =5.02 V (See Note A)
Efficiency vs Load Current; VOUT =5.02 V (See Note A)
100
90
80
70
60
50
40
15
12
9
VIN
VIN
36.0V
48.0V
60.0V
75.0V
75.0V
60.0V
48.0V
36.0V
6
3
0
0
4
8
12
16
20
0
4
8
12
16
20
Iout - Amps
Iout - Amps
Output Ripple vs Load Current; VOUT =5.02 V (See Note A)
Safe Operating Area; Vin =48 V (See Note B)
150
125
100
75
90
80
70
60
50
40
30
20
VIN
Airflow
75.0V
60.0V
48.0V
36.0V
300LFM
200LFM
100LFM
Nat Conv
50
25
0
0
4
8
12
16
20
0
4
8
12
16
20
Iout (A)
Iout - Amps
Note A: All data listed in the above graphs has been developed from actual products tested at 25 °C. This data is considered typical data for the DC/DC converter.
Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperature.
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT4400/4410 Series
Operating Features and System Considerations for
the PT4400/PT4410 Series of DC/DC Converters
Over-Current Protection
To protect against load faults these converters incorporate
output over-current protection. Applying a load to the
output that exceeds the converter’s over-current threshold
(see applicable specification) will cause the output voltage
to momentarily fold back, and then shut down. Following
shutdown the module will periodically attempt to auto-
matically recover by initiating a soft-start power-up.
This is often described as a “hiccup” mode of operation,
whereby the module continues in the cycle of successive
shutdown and power up until the load fault is removed.
Once the fault is removed, the converter automatically
recovers and returns to normal operation.
minimizes the current drain from the input source during
low input voltage conditions. The converter will meet
full specifications when the minimum specified input
voltage is reached. The UVLO circuitry also overrides
the operation of the Remote On/Off control. Only when
the input voltage is above the UVLO threshold will
the Remote On/Off control be functional.
Primary-Secondary Isolation
These converters incorporate electrical isolation between
the input terminals (primary) and the output terminals
(secondary). All converters are production tested to a
withstand voltage of 1500VDC. This specification com-
plies 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. The data sheet ‘Pin Descriptions’ section provides
guidance as to the correct reference that must be used for
the external control signals.
Output Over-Voltage Protection
Each converter incorporates protection circuitry that
continually senses for an output overvoltage (OV) condi-
tion. The O V threshold automatically tracks the VID
output voltage program setting to a level that is 25 %
higher than that programmed at the control pins, VID0
through VID4. If the converter output voltage exceeds
this 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 can
only be done by momentarily removing the input power
to the converter. For failsafe operation and redundancy,
the O V protection uses circuitry that is independent of
the converter’s internal feedback loop.
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 10 A,
is recommended. Active current limiting can be imple-
mented with a current limited “Hot-Swap” controller.
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 a nominal 115 °C, the converter will shut down.
The converter will then automatically restart when the
sensed temperature drops back to approximately 105 °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 exces-
sive thermal stress.
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,
or perpendicular to, the longest side of the module’s
metal case. See Figure 1.
Figure 1
Under-Voltage Lockout
The Under-Voltage Lock-Out (UVLO) is designed to
prevent the operation of the converter until the input
voltage is close to the minimum input voltage. The
converter is held off when the input voltage is below the
UVLO threshold, and turns on when the input voltage
rises above the threshold. This prevents high start-up
current during normal power-up of the converter, and
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
PT4400/4410 Series
Table 2; UVLO Thresholds 4
Using the Remote On/Off Function on the
PT4400/PT4410 Series of DC/DC Converters
Series
Vin Range
UVLO Threshold
PT4400/4410
36 – 75 V
32V 2 V
For applications requiring output voltage On/Off control,
these converters incorporate a “Remote On/Off” control
(pin 1). This feature can be used to switch the module
off without removing the applied input source voltage.
Figure 1
The converter functions normally with Pin 1 open-circuit,
providing a regulated output voltage when a valid source
voltage is applied to +Vin (pins 4, 5), with respect to
-Vin (pins 2, 3). When a low-level ground signal is
applied to pin 1, the converter output will be turned off.
+
REMOTE SENSE
+3.3V
21
+Vs
n
s
+VIN
4,
2,
5
3
17–20
+Vin
+Vout
1
+
L
O
A
D
Co
PT4401
–VIN
13–16
–Vin
-Vout
Remote
On/Off
0V
-Vs
VID0
-
VID4
10 11
n
s
Note
1
Figure 1 is an application schematic, which shows the
typical use of the Remote On/Off function. Note the dis-
crete transistor (Q1). The Remote On/Off pin has its
own internal pull-up, allowing it to be controlled with an
open-collector or open-drain device (See notes 2 & 3).
Table 1 gives the threshold requirements.
1
7
8
9
12
Q1
BSS138
1
=OFF
–
REMOTE SENSE
PROGRAMMING PINS
Note
1
Vdd
R1
10k
U1a
Note
1
When placed in the “Off” state, the standby current drawn
from the input source is typically reduced to less than 1mA.
Turn-On Time: In the circuit of Figure 1, turning Q1 on
applies a low-voltage to pin 1 and disables the converter
output. Correspondingly, turning Q1 off allows pin 1 to
be pulled high by an internal pull-up resistor. The con-
verter produces a regulated output voltage within 50ms.
Figure 2 shows the output response of a PT4401 following
the turn-off of Q1. The turn off of Q1 corresponds to the
drop in Q1 Vgs. Although the rise-time of the output
voltage is short (<5 ms), the indicated delay time will
vary depending upon the input voltage and the module’s
internal timing. The output voltage of the PT4401 was
set to 3.3 V by connecting VID0 (pin 7), VID2 (pin 9),
and VID3 (pin 10) to the (–)Remote Sense (pin 12). The
waveforms were measured with 48 VDC input voltage,
and a 10 A resistive load.
Table 1; Pin 1 Remote On/Off Control Requirements 1
Parameter
Min
Typ
Max
Enable (V
)
4.5 V
—
—
—
—
IH
Disable (V
)
IL
0.8 V
V
[Open-Circuit]
5.0 V
—
o/c
[pin 1 at –V
I
—
–0.5 mA
in
in]
Notes:
1.The Remote On/Off control uses –Vin (pins 2, 3) as its
ground reference. All voltages are with respect to –Vin.
2.Use an open-collector device (preferably
a discrete
transistor) for the Remote On/Off input. A pull-up
resistor is not necessary. To disable the output voltage,
the control pin should be pulled low to less than +0.8 V.
Figure 2
3.The Remote On/Off pin may be controlled with devices that
have a totem-pole output. This is provided the output
high-level voltage (VOH) meets the module’s minimum
VIH specified in Table 1. Do not apply more than +20 V.
If a TTL gate is used, a pull-up resistor may be required to
the logic supply voltage.
Vo (1V/Div)
Iin (1A/Div)
4.The converter incorporates an “Under-Voltage Lockout”
(UVLO). The UVLO keeps the converter off until
the input voltage is close to the minimum specified
operating voltage. This is regardless of the state of
the Remote On/Off control. Table 2 gives the UVLO
input voltage thresholds.
Delay Time
Q1 Vgs (10V/Div)
HORIZ SCALE: 5ms/Div
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT4400/4410 Series
Pin-Coded Output Voltage Adjustment on the
PT4400/4410 Series of DC/DC Converters
input VID4 (pin 11) is internally disabled and is not
functional.
6.If active devices are used to ground the voltage control
pins, low-level open drain MOSFET devices should be
used over bipolar transistors. The inherent Vce(sat) in
bipolar devices introduces errors in the device’s internal
voltage control circuit. Discrete transistors such as the
BSS138 or IRLML2402 are examples of appropriate
devices.
These DC/DC converters have a programmable output
voltage. In each case the desired output voltage must be
selected from one of a number of discrete voltages using
the voltage programming control pins. Depending on
each model’s resolution and adjustment range, there are
up to five control pins. They are identified VID0–VID4
(pins 7–11) respectively. By selectively strapping these
control pins to (–)Remote Sense (pin 12), the output voltage
can be programmed to one of up to 32 different values
over the defined output voltage range. The program code
and output voltage range of the PT4401/4411 is also
compatible with the “Voltage ID” code defined in the
Intel® VRM 8.2 specification. Refer to the applicable
product specification sheet for the program code.
Active Voltage Programming:
Special precautions should be taken when making changes
to the voltage progam code while the output is active.
This activity induces a transient, which may activate
the module’s output over-voltage (OV) protection. Once
triggered the OV protection circuit latches the output
off, and requires the momentary removal of input power
to reset the module. OV protection trips can be avoided
by limiting the output voltage adjustment to no more
than a 15 % change from the initial voltage. Large transi-
tions are best made with a series of incremental changes,
allowing 100 µs settling time between each program state.
When using active devices to program the output voltage,
their state should be asserted prior to input power being
applied. An alternative is to pull pin 1 (Remote On/Off) to
-Vin (pins 2, 3) during the application of power, assert the
required program code, and then release pin 1. The mod-
ule will than initiate a soft-start power-up to the desired
program voltage.
Notes:
1.The programming convention is as follows:-
Logic 0:
Logic 1:
Connect to pin 12 (–Remote Sense).
Open circuit/open drain (See notes 2, & 4)
2.Do not connect pull-up resistors to the voltage
programming pins.
3.To minimize output voltage error, always use pin 12
(-Remote Sense) as the logic “0” reference. While -Vout
(pins 13-16) can also be used for programming, doing so
will degrade the voltage selection accuracy and load
regulation of the product.
4.When VID0–VID4 are all open circuit (logic 1), the
output voltage is undefined. In this state the output
voltage of the converter cannot be guaranteed, and can
vary with output load and input voltage.
5.On all models other than the PT4401/4411, the contol
Figure 1
+
R E M O T E S E N S E
+VOUT
21
+ V sns
+VIN
4,
2,
5
17–20
13–16
+ V in
+ V out
+
L
O
A
D
C o
PT4400
–VIN
3
–Vin
-Vout
Remote
On/Off
–VOUT
-Vsns
12
VID0
8
-
VID4
9 10 11
1
7
Q 1
BSS138
INH
–
R E M O T E S E N S E
P R O G R A M M I N G P I N S
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT4400/4410 Series
PCB Dual Layout for PT4400/4410 and
¼–Brick Package Alternate Build Option
Table 4-1; PT4400/4410 Pin-Out Reference
The PCB footprint for the horizontal package versions
(suffixes A & C) of the PT4400 and PT4410 series are
dimensionally similar to a standard quarter-brick outline,
making it easy to accommodate either package on the host
PCB. This can provide the option for a second source, or
in the case of the PT4400/4410 product, the added func-
tionality of VID output voltage selection in a surface
mount compatible package.
PT4400/4410
Pin Function
1
2
3
4
5
6
7
8
9
Remote On/Off
-V
in
-V
in
+V
+V
in
in
Pin Not Present
VID 0
VID 1
Figure 4-1 shows an example of an alternate PCB layout
that will accommodate the surface mount version of the
PT product (package code ENP). It should be noted that
Figure 4-1 is a dimensionless drawing and is offered only
as a guide. Please refer to the respective package outline
drawing and PCB layout recommendations for the prod-
ucts actually employed. As as an additional reference,
Table 4-1 provides the pin-out for the PT4400/4410
series product.
VID 2
10 VID 3
11 VID 4
12 Sense (–)
13 -V
14 -V
out
15 -V
16 -V
out
17 +V
18 +V
out
19 +V
out
out
out
out
20 +V
out
21 Sense (+)
Figure 4-1; Example PCB Layout for PT4400/4410 and ¼–Brick Package Alternate Build
1
21
+Vout (8)
+Sense(7)
Adjust (6)
–Sense(5)
–Vout (4)
(1) +Vin
(2) On/Off
(3) –Vin
¼–Brick Outline
PT4410 Outline
– Component side
– Alternate Layer
– "¼–Brick" Reference
For technical support and more information, see inside back cover or visit www.ti.com
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