PTH12050W/L
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SLTS214H – MAY 2003 – REVISED OCTOBER 2007
6-A, 12-V INPUT NON-ISOLATED WIDE-OUTPUT
ADJUST POWER MODULE
FEATURES
APPLICATIONS
• Up to 6-A Output Current
• 12-V Input Voltage
• Wide-Output Voltage Adjust
(1.2 V to 5.5 V)/(0.8 V to 1.8 V)
• Efficiencies up to 93%
• 200 W/in3 Power Density
• On/Off Inhibit
• Undervoltage Lockout
• Operating Temperature: –40°C to 85°C
• Auto-Track™ Sequencing
• Output Overcurrent Protection
(Nonlatching, Auto-Reset)
• Safety Agency Approvals:
UL/IEC/CSA-22.2 60950-1
• Point-of-Load Alliance (POLA™) Compatible
•
1
2
Telecom, Industrial, and General-Purpose
Circuits
NOMINAL SIZE =
0.87 i x 0.5 i
(22,1 mm x 12,57 mm)
DESCRIPTION
The PTH12050 series is the smallest non-isolated power modules that features Auto-Track™ Sequencing.
Auto-Track simplifies the sequencing of supply voltages in power systems by enabling modules to track each
other, or any other external voltage, during power up and power down.
Although small in size (0.87 inches × 0.5 inches), these modules are rated for up to 6 A of output current, and
are an ideal choice in applications where space, performance, and a power-up sequencing capability are
important attributes.
The series operates from an input voltage of 12-V to provide step-down conversion to a wide range of output
voltages. The output voltage of the W-suffix device may set to any voltage over the adjust range, 1.2 V to 5.5 V.
The L-suffix device has an adjustment range of 0.8 V to 1.8 V. The output voltage is set within the adjustment
range using a single external resistor.
Other operating features include an on/off inhibit, output voltage adjust (trim), and output overcurrent protection.
For high efficiency, these parts employ a synchronous rectifier output stage.
Target applications include telecom, industrial, and general purpose circuits, including low-power dual-voltage
systems that use the TMS320™ DSP family, microprocessor, ASIC, or FPGA.
For start-up into a non-prebiased output, review page 14 in the Application Information section.
For start-up into a prebiased output, review page 18 in the Application Information section.
1
2
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Auto-Track, POLA, TMS320 are trademarks of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2007, Texas Instruments Incorporated
PTH12050W/L
www.ti.com
SLTS214H – MAY 2003 – REVISED OCTOBER 2007
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
STANDARD APPLICATION
2
VI
3
PTH12050
(Top View)
4
C1
100 mF
(Required)
C2
10 mF
Ceramic
VO
6
1
Track
5
RSET, 1%
(Required)
C3
100 mF
(Optional)
Inhibit
GND
GND
A.
RSET = Required to set the output voltage higher than the minimum value. See the Application Information section for
values.
B.
C2 = 10 µF ceramic capacitor. Required for output voltages 3.3 V or higher.
ORDERING INFORMATION
For the most current package and ordering information, see the Package Option Addendum at the end of this datasheet, or see
the TI website at www.ti.com.
ABSOLUTE MAXIMUM RATINGS
Over operating free-air temperatur range unless otherwise noted
All voltages are with respect to GND
UNIT
VI
Track input voltage
TA
Operating temperature
range
Over VI range
–0.3 V to VI+0.3 V
Twave
Wave solder temperature
Surface temperature of module body or pins
(5＝seconds)
Treflow
Solder reflow temperature
Surface temperature of module body or pins
Tstg
Storage temperature
2
260°C
(1)
PTH12050WAS
235°C
(1)
PTH12050WAZ
260°C
(1)
Mechanical shock
Per Mil-STD-883D, Method 2002.3, 1 msec, ＝ Sine, mounted
500 G
Mechanical vibration
Mil-STD-883D, Method 2007.2, 20-2000 Hz
20 G
Flammability
(2)
PTH12050WAH
–55°C to 125°C
Weight
(1)
–40°C to 85°C
(2)
2.9 grams
Meets UL 94V-O
During soldering of package version, do not elevate peak temperature of the module, pins or internal components above the stated
maximum.
The shipping tray or tape and reel cannot be used to bake parts at temperatures higher than 65°C.
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ELECTRICAL CHARACTERISTICS
TA = 25°C; VI = 12 V; VO = 3.3 V; C1 = 100 µF, C2 = 10 µF, C3 = 0 µF, and IO = IO(max) (unless otherwise stated)
PARAMETER
TEST CONDITIONS
PTH12050W
MIN
IO
Output current
VI
Input voltage range
Vo
Over ΔVadj range
85°C, 400 LFM airflow
TYP
0
60°C, natural convection
Over IO range
10.8
Set-point voltage tolerance
tol
UNIT
MAX
6 (1)
A
6 (1)
A
13.2
V
±2 (2)
%Vo
ΔRegtemp
Temperature variation
–40°C 2.5 V
1
%Vo
14
A
Recovery time
70
µs
VO over/undershoot
100
mV
–0.13 (3)
1
VI increasing
9.5
8.8
10.4
9
Open (3)
Input high voltage, Referenced to GND
V
VIL
Inhibit Control (pin 4)
IIL
Input low voltage, Referenced to GND
–0.2
Input low current, Pin 4 to GND
II
Input standby current
Inhibit (pin 4) to GND, Track (pin 2) open
fs
Switching frequency
Over VI and IO ranges
0.5
0.24
mA
10
260
mA
320
380
100 (5)
3300 (6)
100 (4)
External input capacitance, C1
Nonceramic
0
MTBF
(3)
(4)
(5)
(6)
(7)
Reliability
kHz
µF
Capacitance value
External output capacitance, C3
(1)
(2)
mA
V/ms
V
VI decreasing
VIH
mV
±3 (2)
µF
Ceramic
0
300
(7)
Equivalent series resistance (nonceramic)
4
Per Bellcore TR-332 50% stress, TA = 40°C, ground benign
5.9
106 Hr
See the Temperature Derating (SOA) curves in the Typical Characteristics section for appropriate derating.
The set-point voltage tolerance is affected by the tolerance and stability of RSET. The stated limit is unconditionally met if RSET has a
tolerance of 1% with 100 ppm/°C or better temperature stability.
This control pin has an internal pull-up to the input voltage VI (7.5 V for pin 2). If it is left open-circuit, the module operates when input
power is applied. A small, low-leakage (3300
8 × 12
1
≤4
20SVP100M
SEQP, Os-con (Radial)
20
100
0.024
>3300
8 × 12
1
≤4
20SEQP100M
TPE, Pos-Cap (SMD)
10
220
0.025
>2400
7,3 × 5,7
N/R (3)
≤4
10TPE220ML
AVX, Tantalum
10
100
0.100
>1090
7,3×4,3×4,1
N/R (3)
≤5
TPSD107M010R0100
TPS (SMD)
10
220
0.100
>1414
7,3×4,3×4,1
N/R (3)
≤5
TPSV227M010R0100
25
68
0.095
>1451
7,3×4,3×4,1
2
≤5
TPSV686M025R0080
T520, Poy-Tant (SMD)
10
100
0.080
1200
7,3x5,7x4
N/R (3)
≤5
T520D107M010AS
T495, Tantalum (SMD)
10
100
0.100
>1100
7,3x5,7x4
N/R (3)
≤5
T495X107M010AS
Vishay-Sprague
10
150
0.090
1100
7,3×6×4,1
N/R (3)
≤5
594D157X0010C2T
594D, Tantalum (SMD)
25
68
0.095
1600
7,3×6×4,1
2
≤5
594D686X0025R2T
94SP, Organic (Radial)
16
100
0.070
2890
10 × 10,5
1
≤5
94SP107X0016FBP
94SVP, Organic (SMD)
20
100
0.025
3260
8 × 12
1
≤4
94SVP107X0020E12
Kemet, Ceramic X5R (SMD)
16
10
0.002
–
1210 case
1 (4)
≤5
C1210C106M4PAC
6.3
47
0.002
3225 mm
N/R (3)
≤5
C1210C476K9PAC
6.3
100
0.002
1210 case
N/R (3)
≤3
GRM32ER60J107M
6.3
47
3225 mm
N/R (3)
≤5
GRM32ER60J476M
16
22
1 (4)
≤5
GRM32ER61C226L
(4)
United Chemi-Con
Nichicon Aluminum
Panasonic, Poly-Aluminum
S/SE (SMD)
Kemet
Murata, Ceramic X5R (SMD)
TDK, Ceramic X5R (SMD)
(1)
(2)
(3)
(4)
–
≤5
GRM32DR61C106K
1210 case
N/R (3)
≤3
C3225X5ROJ107MT
3225 mm
N/R (3)
≤5
C3225X5ROJ476MT
22
1 (4)
≤5
C3225X5R1C226MT
10
1 (4)
≤5
C3225X5R1C106MT
16
10
6.3
100
6.3
47
16
16
1
0.002
–
Capacitor Supplier Verification
Please verify availability of capacitors identified in this table. Capacitor suppliers may recommend alternative part numbers because of
limited availability or obsolete products. In some instances, the capacitor product life cycle may be in decline and have short-term
consideration for obsolescence.
RoHS, Lead-free and Material Details
Please consult capacitor suppliers regarding material composition, RoHS status, lead-free status, and manufacturing process
requirements. Component designators or part number deviations can occur when material composition or soldering requirements are
updated.
The voltage rating of this capacitor only allows it to be used for output voltages that are equal to or less than 5.1 V.
N/R – Not recommended. The capacitor voltage rating does not meet the minimum operating limits.
Ceramic capacitors are required to complement electrolytic types at the input and to reduce high-frequency ripple current.
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Designing for Very Fast Load Transients
The transient response of the dc/dc converter has been characterized using a load transient with a di/dt of
1 A/µs. The typical voltage deviation for this load transient is given in the data sheet specification table using the
optional value of output capacitance. As the di/dt of a transient is increased, the response of a converter's
regulation circuit ultimately depends on its output capacitor decoupling network. This is an inherent limitation with
any dc/dc converter once the speed of the transient exceeds its bandwidth capability. If the target application
specifies a higher di/dt or lower voltage deviation, the requirement can only be met with additional output
capacitor decoupling. In these cases special attention must be paid to the type, value and ESR of the capacitors
selected.
If the transient performance requirements exceed that specified in the data sheet, or the total amount of load
capacitance is above 3,000 µF, the selection of output capacitors becomes more important.
Features of the PTH Family of Non-Isolated Wide Output Adjust Power Modules
Introduction
The PTH/PTV family of non-isolated, wide-output adjustable power modules are optimized for applications that
require a flexible, high performance module that is small in size. Each of these products are POLA™ compatible.
POLA-compatible products are produced by a number of manufacturers, and offer customers advanced,
nonisolated modules with the same footprint and form factor. POLA parts are also ensured to be interoperable,
thereby, providing customers with second-source availability.
From the basic, Just Plug It In functionality of the 6-A modules, to the 30-A rated feature-rich PTHxx030, these
products were designed to be very flexible, yet simple to use. The features vary with each product. Table 5
provides a quick reference to the features by product series and input bus voltage.
Table 5. Operating Features by Series and Input Bus Voltage
Series
PTHxx050
PTHxx060
PTHxx010
PTVxx010
PTHxx020
PTVxx020
PTHxx030
Input Bus (V)
IO (A)
Adjust
(Trim)
On/Off
Inhibit
OverCurrent
Prebias
Startup
AutoTrack™
3.3
6
•
•
•
•
•
5
6
•
•
•
•
•
Margin
Up/Down
Output
Sense
Thermal
Shutdown
12
6
•
•
•
•
•
3.3 / 5
10
•
•
•
•
•
•
•
12
10
•
•
•
•
•
•
•
3.3 / 5
15
•
•
•
•
•
•
•
12
12
•
•
•
•
•
•
•
5
8
•
•
•
•
•
12
8
•
•
•
•
•
3.3 / 5
22
•
•
•
•
•
•
•
•
12
18
•
•
•
•
•
•
•
•
5
18
•
•
•
•
•
•
•
12
16
•
•
•
•
•
•
•
3.3 / 5
30
•
•
•
•
•
•
•
•
12
26
•
•
•
•
•
•
•
•
For simple point-of-use applications, the PTH12050 (6 A) provides operating features such as an on/off inhibit,
output voltage trim, prebias start-up and overcurrent protection. The PTH12060 (10 A), and PTH12010 (12 A)
include an output voltage sense, and margin up/down controls. Then the higher output current, PTH12020 (18 A)
and PTH12030 (26 A) products incorporate overtemperature shutdown protection.
The PTV12010 and PTV12020 are similar parts offered in a vertical, single in-line pin (SIP) profile, at slightly
lower current ratings.
All of the products referenced in Table 5 include Auto-Track™. This feature was specifically designed to simplify
the task of sequencing the supply voltages in a power system. This and other features are described in the
following sections.
12
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POWER-UP INTO A NON-PREBIASED OUTPUT — AUTO-TRACK™ FUNCTION
The Auto-Track function is unique to the PTH/PTV family, and is available with all POLA products. Auto-Track
was designed to simplify the amount of circuitry required to make the output voltage from each module power up
and power down in sequence. The sequencing of two or more supply voltages during power up is a common
requirement for complex mixed-signal applications that use dual-voltage VLSI ICs such as the TMS320™ DSP
family, microprocessors, and ASICs.
Basic Power-Up Using Auto-Track™
For applications requiring output voltage on/off control, each series of the PTH family incorporates the track
control pin. The Auto-Track feature should be used instead of the inhibit feature wherever there is a requirement
for the output voltage from the regulator to be turned on/off.
Figure 11 shows the typical application for basic start-up. Note the discrete transistor (Q1). The track input has
its own internal pull-up to a potential of 5 V to 13.2 V The input is not compatible with TTL logic devices. An
open-collector (or open-drain) discrete transistor or supply voltage supervisor (TPS3808 or TPS7712) is
recommended for control.
10
Margin
Up
9
3
5
Margin
Down
Inhibit
VOSense
VO
2
Track
GND
GND
VoAdj
8
1
7
4
+
CI
560 µF
1=Turn−Off
VO
PTH12060W
VI
6
RSET
2 kΩ
0.1 W
1%
Q1
BSS138
L
O
A
D
+
CO
330 µF
GND
UDG−06074
Figure 11. Basic Start-up Control Circuit
Turning on Q1 applies a low voltage to the track control pin and disables the output of the module. If Q1 is then
turned off, the output ramps immediately to the regulated output voltage. A regulated output voltage is produced
within 35 ms. With the initial application of the input source voltage, the track pin must be held low (Q1 turned
ON) for at least 40 ms. Figure 12 shows the typical rise in both the output voltage and input current, following the
turn off of Q1. The turn off of Q1 corresponds to the rise in the waveform, Q1 Vds. The waveforms were
measured with a 10-A constant current load.
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Q1VDS (2 V/div)
VO (2 V/div)
II (2 A/div)
t − Time − 40 ms/div
Figure 12. Power-Up from Track Control
NOTE:
If a prebias condition is not present, it is highly recommended that the Track control
pin be used for controlled power-up and power-down. If Track control is not used, the
output voltage starts up and overshoots by as much as 10%, before settling at the
output voltage setpoint.
How Auto-Track™ Works
Auto-Track works by forcing the module output voltage to follow a voltage presented at the Track control pin (1).
This control range is limited to between 0 V and the module set-point voltage. Once the track-pin voltage is
raised above the set-point voltage, the module output remains at its set-point (2). As an example, if the Track pin
of a 2.5-V regulator is at 1 V, the regulated output is 1 V. If the voltage at the Track pin rises to 3 V, the regulated
output does not go higher than 2.5 V.
When under Auto-Track control, the regulated output from the module follows the voltage at its Track pin on a
volt-for-volt basis. By connecting the Track pin of a number of these modules together, the output voltages follow
a common signal during power up and power down. The control signal can be an externally generated master
ramp waveform, or the output voltage from another power supply circuit (3). For convenience, the Track input
incorporates an internal RC-charge circuit. This operates off the module input voltage to produce a suitable rising
waveform at power up.
14
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Typical Auto-Track Application
The basic implementation of Auto-Track allows for simultaneous voltage sequencing of a number of Auto-Track
compliant modules. Connecting the Track inputs of two or more modules forces their track input to follow the
same collective RC-ramp waveform, and allows their power-up sequence to be coordinated from a common
Track control signal. This can be an open-collector (or open-drain) device, such as a power-up reset voltage
supervisor IC. See U3 in Figure 13.
To coordinate a power-up sequence, the Track control must first be pulled to ground potential through RTRK as
defined in Figure 13. This should be done at or before input power is applied to the modules. The ground signal
should be maintained for at least 40 ms after input power has been applied. This brief period gives the modules
time to complete their internal soft-start initialization (4), enabling them to produce an output voltage. A low-cost
supply voltage supervisor IC, that includes a built-in time delay, is an ideal component for automatically
controlling the Track inputs at power up.
Figure 13 shows how the TL7712A supply voltage supervisor IC (U3) can be used to coordinate the sequenced
power up of two 12-V input Auto-Track modules. The output of the TL7712A supervisor becomes active above
an input voltage of 3.6 V, enabling it to assert a ground signal to the common track control well before the input
voltage has reached the module's undervoltage lockout threshold. The ground signal is maintained until
approximately 43 ms after the input voltage has risen above U3's voltage threshold, which is 10.95 V. The 43-ms
time period is controlled by the capacitor C3. The value of 3.3 µF provides sufficient time delay for the modules
to complete their internal soft-start initialization. The output voltage of each module remains at zero until the track
control voltage is allowed to rise. When U3 removes the ground signal, the track control voltage automatically
rises. This causes the output voltage of each module to rise simultaneously with the other modules, until each
reaches its respective set-point voltage.
Figure 14 shows the output voltage waveforms from the circuit of Figure 13 after input voltage is applied to the
circuit. The waveforms, VO1 and VO2, represent the output voltages from the two power modules, U1 (3.3 V) and
U2 (1.8 V), respectively. VTRK, VO1, and VO2 are shown rising together to produce the desired simultaneous
power-up characteristic.
The same circuit also provides a power-down sequence. When the input voltage falls below U3's voltage
threshold, the ground signal is re-applied to the common track control. This pulls the track inputs to zero volts,
forcing the output of each module to follow, as shown in Figure 15. In order for a simultaneous power-down to
occur, the track inputs must be pulled low before the input voltage has fallen below the modules' undervoltage
lockout. This is an important constraint. Once the modules recognize that a valid input voltage is no longer
present, their outputs can no longer follow the voltage applied at their track input. During a power-down
sequence, the fall in the output voltage from the modules is limited by the maximum output capacitance and the
Auto-Track slew rate. If the Track pin is pulled low at a slew rate greater than 1 V/ms, the discharge of the output
capacitors will induce large currents which could exceed the peak current rating of the module. This will result in
a reduction in the maximum allowable output capacitance as listed in the Electrical Characteristics table. When
controlling the Track pin of the PTH12060W using a voltage supervisor IC, the slew rate is increased, therefore
COmax is reduced to 2200 μF.
Notes on Use of Auto-Track™
1. The Track pin voltage must be allowed to rise above the module set-point voltage before the module
regulates at its adjusted set-point voltage.
2. The Auto-Track function tracks almost any voltage ramp during power up, and is compatible with ramp
speeds of up to 1 V/ms.
3. The absolute maximum voltage that may be applied to the Track pin is the input voltage VI.
4. The module cannot follow a voltage at its track control input until it has completed its soft-start initialization.
This takes about 40 ms from the time that a valid voltage has been applied to its input. During this period, it
is recommended that the Track pin be held at ground potential.
5. The Auto-Track function is disabled by connecting the Track pin to the input voltage (VI). When Auto-Track is
disabled, the output voltage rises at a quicker and more linear rate after input power has been applied.
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2
U1
Track
VI = 12 V
3
Vo 1 = 3.3 V
6
VI
VO
PTH12050W
Inhibit
GND
4
1
Adjust
5
+
+
CI1
CO1
RSET1
2.0 kΩ
8
U3
VCC
7
SENSE
RESET
2
5
RTRK #
RESIN
1
3
50 Ω
TL7712A
REF
0.1 µF
9
Up Dn
RESET
8
5
Track
Sense
CT
2
GND
CREF
10
U2
6
CT
3.3 µF
4
VI
VO
PTH12060W
Vo 2 = 1.8 V
6
RRST
10 kΩ
Inhibit
3
Adjust
GND
1
7
4
+
# RTRK = 100 Ω / N
N = Number of Track pins connected together
C I2
RSET2
+
CO2
11.5 kΩ
Figure 13. Sequenced Power Up and Power Down Using Auto-Track
VTRK (1 V/div)
VTRK (1 V/div)
V01 (1 V/div)
V01 (1 V/div)
V02 (1 V/div)
V02 (1 V/div)
t − Time − 400 µs/div
t − Time − 20 ms/div
Figure 14. Simultaneous Power Up With Auto-Track
Control
16
Figure 15. Simultaneous Power Down with Auto-Track
Control
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POWER-UP INTO A PREBIASED OUTPUT — START-UP USING INHIBIT CONTROL
The capability to start up into an output prebias condition is now available to all the 12-V input, PTH series of
power modules. (Note that this is a feature enhancement for the many of the W-suffix products) [1].
A prebias startup condition occurs as a result of an external voltage being present at the output of a power
module prior to its output becoming active. This often occurs in complex digital systems when current from
another power source is backfed through a dual-supply logic component, such as an FPGA or ASIC. Another
path might be via clamp diodes, sometimes used as part of a dual-supply power-up sequencing arrangement. A
prebias can cause problems with power modules that incorporate synchronous rectifiers. This is because under
most operating conditions, such modules can sink as well as source output current. The 12-V input PTH modules
all incorporate synchronous rectifiers, but does not sink current during startup, or whenever the Inhibit pin is held
low.
Conditions for Prebias Holdoff
In order for the module to allow an output prebias voltage to exist (and not sink current), certain conditions must
be maintained. The module holds off a prebias voltage when the Inhibit pin is held low, and whenever the output
is allowed to rise under soft-start control. Power up under soft-start control occurs upon the removal of the
ground signal to the Inhibit pin (with input voltage applied), or when input power is applied with Auto-Track
disabled [2]. To further ensure that the regulator doesn’t sink output current, (even with a ground signal applied to
its Inhibit), the input voltage must always be greater than the applied prebias source. This condition must exist
throughout the power-up sequence [3].
The soft-start period is complete when the output begins rising above the prebias voltage. Once it is complete
the module functions as normal, and sinks current if a voltage higher than the nominal regulation value is applied
to its output.
Note: If a prebias condition is not present, the soft-start period is complete when the output voltage has risen
to either the set-point voltage, or the voltage applied at the module's Track control pin, whichever is lowest.
to its output.
Prebias Demonstration Circuit
Figure 16 shows the startup waveforms for the demonstration circuit shown in Figure 17. The initial rise in VO2 is
the prebias voltage, which is passed from the VCCIO to the VCORE voltage rail through the ASIC. Note that the
output current from the PTH12010L module (IO2) is negligible until its output voltage rises above the applied
prebias.
VO1 (1 V/div)
VO2 (1 V/div)
IO2 (5 V/div)
t − Time − 10 ms/div
Figure 16. Prebias Startup Waveforms
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17
PTH12050W/L
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SLTS214H – MAY 2003 – REVISED OCTOBER 2007
10 9
Up
VI = 12 V
2
VI
5
Sense
GND
1
7
C1
330 mF
10 9
R3
11 k0
TL7702B
8
7
R4
100 kW
C5
0.1 mF
PTH12010L
Inhibit
3
8
VCC
SENSE
5
RESET
2
RESIN
1
REF
6
RESET
3
CT
GND
4
R5
C6
10 k0
0.68 mF
VI
GND
1
7
6
Adjust
4
R1
2 kW
Tra ck
2
VO
PTH12020W
Inhibit
3
+
8
Dn Tra ck
VO1 = 3.3 V
+
C2
330 mF
5
Sense
VO
6
Vadj
4
VO2 = 1.8 V
+
IO2
R1
130 W
+
C3
330 mF
VC ORE
+ C4
330 mF
VC CI O
ASIC
Figure 17. Application Circuit Demonstrating Prebias Startup
Notes:
1. Output prebias holdoff is an inherent feature to all PTH120x0L and PTV120x0W/L modules. It has now been
incorporated into all modules (including W-suffix modules with part numbers of the form PTH120x0W), with a
production lot date code of 0423 or later.
2. The prebias start-up feature is not compatible with Auto-Track. If the rise in the output is limited by the
voltage applied to the Track control pin, the output sinks current during the period that the track control
voltage is below that of the back-feeding source. For this reason, it is recommended that Auto-Track be
disabled when not being used. This is accomplished by connecting the Track pin to the input voltage, VI. This
raises the Track pin voltage well above the set-point voltage prior to the module’s start up, thereby, defeating
the Auto-Track feature.
3. To further ensure that the regulator's output does not sink current when power is first applied (even with a
ground signal applied to the Inhibit control pin), the input voltage must always be greater than the applied
prebias source. This condition must exist throughout the power-up sequence of the power system.
18
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PTH12050W/L
www.ti.com
SLTS214H – MAY 2003 – REVISED OCTOBER 2007
Overcurrent Protection
For protection against load faults, all modules incorporate output overcurrent protection. Applying a load that
exceeds the regulator's overcurrent threshold causes the regulated output to shut down. Following shutdown, a
module periodically attempts to recover by initiating a soft-start power-up. This is described as a hiccup mode of
operation, whereby, the module continues in a cycle of successive shutdown and power up until the load fault is
removed. During this period, the average current flowing into the fault is significantly reduced. Once the fault is
removed, the module automatically recovers and returns to normal operation.
Overtemperature Protection (OTP)
The PTH12020, PTV12020, and PTH12030 products have overtemperature protection. These products have an
on-board temperature sensor that protects the module's internal circuitry against excessively high temperatures.
A rise in the internal temperature may be the result of a drop in airflow, or a high ambient temperature. If the
internal temperature exceeds the OTP threshold, the module's Inhibit control is internally pulled low. This turns
the output off. The output voltage drops as the external output capacitors are discharged by the load circuit. The
recovery is automatic, and begins with a soft-start power up. It occurs when the sensed temperature decreases
by about 10°C below the trip point.
Note: The overtemperature protection is a last resort mechanism to prevent thermal stress to the regulator.
Operation at or close to the thermal shutdown temperature is not recommended and will reduce the
long-term reliability of the module. Always operate the regulator within the specified Safe Operating Area
(SOA) limits for the worst-case conditions of ambient temperature and airflow.
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Product Folder Link(s): PTH12050W/L
19
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SLTS214H – MAY 2003 – REVISED OCTOBER 2007
TAPE AND REEL SPECIFICATION
20
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Copyright © 2003–2007, Texas Instruments Incorporated
Product Folder Link(s): PTH12050W/L
PTH12050W/L
www.ti.com
SLTS214H – MAY 2003 – REVISED OCTOBER 2007
TRAY SPECIFICATION
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Copyright © 2003–2007, Texas Instruments Incorporated
Product Folder Link(s): PTH12050W/L
21
PACKAGE OPTION ADDENDUM
www.ti.com
6-Feb-2022
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
(3)
Device Marking
(4/5)
(6)
PTH12050LAH
ACTIVE
ThroughHole Module
EUU
6
56
RoHS Exempt
& Green
SN
N / A for Pkg Type
-40 to 85
PTH12050LAST
ACTIVE
Surface
Mount Module
EUV
6
250
Non-RoHS
& Green
SNPB
Level-1-235C-UNLIM/
Level-3-260C-168HRS
-40 to 85
PTH12050LAZ
ACTIVE
Surface
Mount Module
EUV
6
56
RoHS (In
Work) & Green
SNAGCU
Level-3-260C-168 HR
-40 to 85
PTH12050LAZT
ACTIVE
Surface
Mount Module
EUV
6
250
RoHS (In
Work) & Green
SNAGCU
Level-3-260C-168 HR
-40 to 85
PTH12050WAD
ACTIVE
ThroughHole Module
EUU
6
56
RoHS Exempt
& Green
SN
Level-1-235C-UNLIM/
Level-3-260C-168HRS
-40 to 85
PTH12050WAH
ACTIVE
ThroughHole Module
EUU
6
56
RoHS Exempt
& Green
SN
Level-1-235C-UNLIM/
Level-3-260C-168HRS
-40 to 85
PTH12050WAS
ACTIVE
Surface
Mount Module
EUV
6
56
Non-RoHS
& Green
SNPB
Level-1-235C-UNLIM/
Level-3-260C-168HRS
-40 to 85
PTH12050WAST
ACTIVE
Surface
Mount Module
EUV
6
250
Non-RoHS
& Green
SNPB
Level-1-235C-UNLIM/
Level-3-260C-168HRS
-40 to 85
PTH12050WAZ
ACTIVE
Surface
Mount Module
EUV
6
56
RoHS (In
Work) & Green
SNAGCU
Level-3-260C-168 HR
-40 to 85
PTH12050WAZT
ACTIVE
Surface
Mount Module
EUV
6
250
RoHS (In
Work) & Green
SNAGCU
Level-3-260C-168 HR
-40 to 85
(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)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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