PTN78060AAS-T [TI]
15-W, WIDE-INPUT ADJUSTABLE POSITIVE-TO-NEGATIVE VOLTAGE REGULATOR MODULE; 15 -W ，宽输入可调节正到负电压调节模块
| 型号： | PTN78060AAS-T |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 15-W, WIDE-INPUT ADJUSTABLE POSITIVE-TO-NEGATIVE VOLTAGE REGULATOR MODULE |
| 文件： | 总18页 (文件大小：1376K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PTN78060A
www.ti.com
SLTS245A–APRIL 2005–REVISED MAY 2005
15-W, WIDE-INPUT ADJUSTABLE POSITIVE-TO-NEGATIVE
VOLTAGE REGULATOR MODULE
FEATURES
APPLICATIONS
•
•
•
General-Purpose, Industrial Controls,
HVAC Systems
Test and Measurement,
Medical Instrumentation
AC/DC Adaptors, Vehicles,
Marine, and Avionics
•
Up to 3-A Output Current
•
Wide-Input Voltage
(9 V to 29 V)
•
Wide-Output Voltage Adjust
(–15 V to –3 V)
•
•
•
•
•
•
High Efficiency (Up to 88%)
Undervoltage Lockout
Output Current Limit
Overtemperature Shutdown
Operating Temperature: –40°C to 85°C
Surface-Mount Package Available
DESCRIPTION
The PTN78060A is a series of high-efficiency, buck-boost, integrated switching regulators (ISR), that represent
the third generation in the evolution of the (PT)78NR100 series of products. In new designs, the PTN78060A
series should also be considered in place of the PT6640 series of single in-line pin (SIP) products. In all cases,
the PTN78060A has either similar or improved electrical performance characteristics. The caseless, double-sided
package has excellent thermal characteristics, and is compatible with TI's roadmap for RoHS and lead-free
compliance.
Operating from a wide-input voltage range of 9 V to 29 V, the PTN78060A provides high-efficiency,
positive-to-negative voltage conversion for loads of up to 3 A. The output voltage can be set to any value over a
wide adjustment range using a single external resistor. The adjust range is –15 V to –3 V.
The PTN78060A is suited to a wide variety of general-purpose industrial applications that operate off 12-V, 24-V,
or tightly regulated 28-V dc power.
V
O
1
7
STANDARD APPLICATION
PTN78060A
(Top View)
V
I
6
2
L
O
A
D
3
4
5
C1*
C2*
C3*
100 mF
3x 4.7 mF
Ceramic
100 mF
(Required)
Electrolytic
(Required)
R
SET
#
(Required)
1 %, 0.05 W
(Required)
GND
GND
*See the Application Information for capacitor recommendation.
#R is required to adjust the output voltage lower than -3 V. See the Application Information for values.
SET
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.
PRODUCTION DATA information is current as of publication date.
Copyright © 2005, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
PTN78060A
www.ti.com
SLTS245A–APRIL 2005–REVISED MAY 2005
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.
ORDERING INFORMATION
PTN78060 (Basic Model)
Output Voltage
Part Number
Description
Package Designator
EUW-7
PTN78060AAH
Horizontal T/H (Pb-free)
Horizontal SMD (standard)
Horizontal SMD (Pb-free)
(1)(2)
–15 V to –3 V
PTN78060AAS
PTN78060AAZ
EUY-7
(1)(3)
EUY-7
(1) Add a T suffix for tape and reel option on SMD packages.
(2) Standard option specifies Sn/Pb solder ball material.
(3) Lead (Pb) - free option specifies Sn/Ag solder ball material.
(1)
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted
all voltages with respect to GND
UNIT
TA
Operating free-air temperature
Solder reflow temperature
Over VI range
–40°C to 85°C
Surface temperature of module body or
pins
Horizontal SMD (suffix AS)
Horizontal SMD (suffix AZ)
235°C
260°C
Tstg
PO
Storage temperature
Output power
–40°C to 125°C
15 W
|VO| ≥ 5 V
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
MIN
9
MAX
32 - |VO|
85
UNIT
V
VI
Input voltage
TA
Operating free-air temperature
–40
°C
PACKAGE SPECIFICATIONS
PTN78060x (Suffix AH, AS, and AZ)
Weight
3.9 grams
Flammability
Meets UL 94 V-O
Per Mil-STD-883D, Method 2002.3, 1 ms, ½ sine,
mounted
(1)
Mechanical shock
500 Gs
(1)
Horizontal T/H (suffix AH)
20 Gs
Mechanical vibration
Mil-STD-883D, Method 2007.2, 20-2000 Hz
(1)
Horizontal SMD (suffix AS & AZ)
20 Gs
(1) Qualification limit.
2
PTN78060A
www.ti.com
SLTS245A–APRIL 2005–REVISED MAY 2005
ELECTRICAL CHARACTERISTICS
operating at 25°C free-air temperature, VI = 20 V, VO = –5 V, IO = IO (max), C1 = 100 µF, C2 = 3 × 4.7 µF, and C3 = 100 µF
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
0.1
0.1
0.1
0.1
9
TYP
MAX
UNIT
(1)
VO = –15 V
VO = –12 V
VO = –5 V
1
(1)
1.25
IO
Output current
TA = 85°C, natural convection airflow
A
(1)
(1)
(2)
(2)
(2)
(2)
3
3
VO = –3.3 V
VO = –15 V
VO = –12 V
VO = –5 V
17
9
20
VI
Input voltage range
Over IO range
V
9
27
VO = –3.3 V
9
28.7
Set-point voltage toler-
ance
TA = 25°C
±2%(3)
Temperature variation
Line regulation
–40°C to +85°C
Over VI range
Over IO range
±0.5%
±10
VO
mV
mV
Load regulation
±10
Total output voltage vari- Includes set point, line, load
(3)
±3%
ation
–40 < TA < 85°C
Output voltage adjust
range
9 V ≤ VI ≤ (32 - |VO|) V
–15
–3
VO
V
RSET = 100 Ω, IO = 1 A, VO = –15 V
RSET = 2 kΩ, IO = 1.25 A, VO = –12 V
RSET = 28.7 kΩ, IO = 3 A, VO = –5 V
RSET = 221 kΩ, IO = 3 A, VO = –3.3 V
88%
87%
82%
77%
1% VO
5.5
η
Efficiency
Output voltage ripple
Current limit threshold
20-MHz bandwidth
V(PP)
A
IO (LIM)
∆VO = –50 mV
Recovery time
200
µs
1-A/µs load step from 50% to 100%
IOmax
Transient response
VO over/undershoot
2
%VO
kHz
V
FS
Switching frequency
Undervoltage lockout
Over VI and IO ranges
440
550
660
UVLO
VI increasing
5.5
(4)
Ceramic
14.1
External input capaci-
tance
CI
µF
µF
(4)
Nonceramic
100
Ceramic
200
External output capaci-
tance
(5)
(6)
CO
Nonceramic
100
14
1000
Equivalent series resistance (nonceramic)
mΩ
Per Telcordia SR-332, 50% stress,
TA = 40°C, ground benign
106 Hr
MTBF
Calculated reliability
8.9
(1) The maximum output current is 3 A or a maximum output power of 15 W, whichever is less.
(2) The maximum input voltage is limited and defined to be (32 - |VO|).
(3) 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.
(4) A 100-µF electrolytic capacitor and three 4.7-µF ceramic capacitors are required across the input (VI and GND) for proper operation.
Locate the ceramic capacitors close to the module.
(5) 100 µF of output capacitance is required for proper operation. See the application information for further guidance.
(6) This is the typical ESR for all the electrolytic (nonceramic) capacitance. Use 17 mΩ as the minimum when using max-ESR values to
calculate.
3
PTN78060A
www.ti.com
SLTS245A–APRIL 2005–REVISED MAY 2005
PIN ASSIGNMENT
1
7
PTN78060A
(Top View)
2
6
3
4
5
TERMINAL FUNCTIONS
TERMINAL
I/O
DESCRIPTION
NAME
NO.
The negative output voltage power connection. It is also the reference for the VO Adjust control input. For
proper operation, pins 1 and 7 must be connected.
VO
1, 7
O
I
VI
2
3
The positive input voltage power node to the module, which is referenced to common GND.
This pin is active and must be isolated from any electrical connection.
N/C
A 1% resistor must be connected between pin 4 and pin 7 to set the output voltage of the module. The
adjust range is –15 V to –3 V. If left open-circuit, the output voltage defaults to –3 V. The temperature
stability of the resistor should be 100 ppm/°C (or better). The standard resistor value for a number of
common output voltages is provided in the application information.
VO Adjust
4
I
N/C
5
6
This pin is active and must be isolated from any electrical connection.
The common ground connection for both VI and VO power connections.
GND
I/O
4
PTN78060A
www.ti.com
SLTS245A–APRIL 2005–REVISED MAY 2005
(1)(2)
TYPICAL CHARACTERISTICS (9-V INPUT)
EFFICIENCY
vs
OUTPUT CURRENT
OUTPUT VOLTAGE RIPPLE
vs
POWER DISSIPATION
vs
OUTPUT CURRENT
OUTPUT CURRENT
300
4.5
90
85
80
75
70
65
4
250
V
= -12 V
3.5
V
O
= -12 V
O
V
= -15 V
O
200
3
V
= -15 V
O
V
O
= -12 V
2.5
150
V
= -15 V
2
1.5
1
O
V
= -5 V
O
100
50
0
V
= -5 V
60
V
= -3 V
O
V
= -5 V
O
O
55
0.5
0
V
= -3 V
V
= -3 V
O
O
50
0
0.5
1
1.5
2
2.5
3
0
0.5
1
1.5
2
2.5
3
3
0
0.5
1
1.5
2
2.5
I
O
- Output Current - A
I
O
- Output Current - A
I
O
- Output Current - A
Figure 1.
Figure 2.
Figure 3.
TEMPERATURE DERATING
vs
TEMPERATURE DERATING
vs
TEMPERATURE DERATING
vs
OUTPUT CURRENT
OUTPUT CURRENT
OUTPUT CURRENT
90
80
70
60
90
80
70
60
90
80
70
60
200 LFM
100 LFM
Nat conv
200 LFM
200 LFM
100 LFM
100 LFM
Nat conv
50
40
30
20
50
40
30
20
50
40
30
20
Nat conv
V
= -12 V
O
V
= -15 V
V
= -5 V
O
O
0
0.2
0.4
0.6
0.8
1
0
0.5
1
1.5
2
2.5
3
0
0.25
0.5
0.75
1
1.25
I
O
- Output Current - A
I
O
- Output Current - A
I
O
- Output Current - A
Figure 4.
Figure 5.
Figure 6.
(1) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the
converter. Applies to Figure 1, Figure 2, and Figure 3.
(2) The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum
operating temperatures. Derating limits apply to modules soldered directly to a 100 mm x 100 mm, double-sided PCB with 2 oz. copper.
Applies to Figure 4, Figure 5, and Figure 6.
5
PTN78060A
www.ti.com
SLTS245A–APRIL 2005–REVISED MAY 2005
(1)(2)
TYPICAL CHARACTERISTICS (12-V INPUT)
EFFICIENCY
vs
OUTPUT CURRENT
OUTPUT VOLTAGE RIPPLE
vs
POWER DISSIPATION
vs
OUTPUT CURRENT
OUTPUT CURRENT
90
85
80
75
70
65
4
200
V
= -15 V
V
O
= -12 V
O
3.5
V
= -12 V
160
O
3
2.5
2
V
= -15 V
O
120
V
= -12 V
O
V
= -5 V
V
O
= -15 V
O
80
1.5
V
= -5 V
V
= -3 V
O
O
60
1
V
= -5 V
O
40
55
0.5
V
= -3 V
V
= -3 V
O
O
0
0
50
0
0.5
1
1.5
2
2.5
3
0
0.5
1
1.5
2
2.5
3
3
0
0.5
1
1.5
2
2.5
I
O
- Output Current - A
I
O
- Output Current - A
I
- Output Current - A
O
Figure 7.
Figure 8.
Figure 9.
TEMPERATURE DERATING
vs
TEMPERATURE DERATING
vs
TEMPERATURE DERATING
vs
OUTPUT CURRENT
OUTPUT CURRENT
OUTPUT CURRENT
90
80
70
60
90
80
70
60
90
80
70
60
200 LFM
100 LFM
Nat conv
200 LFM
100 LFM
Nat conv
200 LFM
100 LFM
50
40
30
50
40
30
20
50
40
30
20
Nat conv
V
= -15 V
V
= -5 V
V
= -12 V
O
O
O
20
0
0.25
0.5
0.75
1
1.25
0
0.2
0.4
0.6
0.8
1
0
0.5
1
1.5
2
2.5
3
I
- Output Current - A
I
- Output Current - A
O
O
I
- Output Current - A
O
Figure 10.
Figure 11.
Figure 12.
(1) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the
converter. Applies to Figure 7, Figure 8, and Figure 9.
(2) The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum
operating temperatures. Derating limits apply to modules soldered directly to a 100 mm x 100 mm, double-sided PCB with 2 oz. copper.
Applies to Figure 10, Figure 11, and Figure 12.
6
PTN78060A
www.ti.com
SLTS245A–APRIL 2005–REVISED MAY 2005
(1)(2)
TYPICAL CHARACTERISTICS (24-V INPUT)
EFFICIENCY
vs
OUTPUT CURRENT
OUTPUT VOLTAGE RIPPLE
vs
POWER DISSIPATION
vs
OUTPUT CURRENT
OUTPUT CURRENT
90
85
80
75
160
3.5
140
3
120
2.5
V
= -5 V
O
70
100
V
= -5 V
2
O
65
80
V
= -5 V
60
55
50
45
40
O
1.5
60
V
= -3 V
O
1
40
V
= -3 V
O
0.5
V
= -3 V
20
O
0
0.5
1
1.5
2
2.5
3
0
0
3
0
0.5
1
1.5
2
2.5
3
0
0.5
1
1.5
2
2.5
I
- Output Current - A
O
I
- Output Current - A
I
- Output Current - A
O
O
Figure 13.
Figure 14.
Figure 15.
TEMPERATURE DERATING
vs
TEMPERATURE DERATING
vs
OUTPUT CURRENT
OUTPUT CURRENT
90
80
70
60
90
80
70
60
200LFM
200LFM
100 LFM
100 LFM
50
40
30
20
50
40
30
20
atconv
Nat conv
O
= -5 V
O
V
3.3V
O
0
0.5
1
1.5
2
2.5
3
0
0.5
1
1.5
2
2.5
3
I
- Output Current - A
I
- Output Current - A
O
O
Figure 16.
Figure 17.
(1) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the
converter. Applies to Figure 13, Figure 14, and Figure 15.
(2) The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum
operating temperatures. Derating limits apply to modules soldered directly to a 100 mm x 100 mm, double-sided PCB with 2 oz. copper.
Applies to Figure 16, and Figure 17.
7
PTN78060A
www.ti.com
SLTS245A–APRIL 2005–REVISED MAY 2005
APPLICATION INFORMATION
Adjusting the Output Voltage of the PTN78060A Wide-Output Adjust Power Modules
General
A resistor must be connected directly between the VO Adjust control (pin 4) and the output voltage (pin 7) to set
the output voltage lower than –3 V. The adjustment range is from –15 V to –3 V. If pin 4 is left open, the output
voltage defaults to the highest value, –3 V.
Table 1 gives the standard resistor value for a number of common voltages, and with the actual output voltage
that the value produces. For other output voltages, the resistor value can either be calculated using the following
formula, or simply selected from the range of values given in Table 2. Figure 18 shows the placement of the
required resistor.
1.25 V
- 5.62 kW
R
= 54.9 kW ´
SET
|V | - 3 V
O
(1)
Input Voltage Considerations
The PTN78060A is a buck-boost switching regulator. In order that the output remains in regulation, the input
voltage must not exceed the output by a maximum differential voltage.
Another consideration is the pulse width modulation (PWM) range of the regulator's internal control circuit. For
stable operation, its operating duty cycle should not be lower than some minimum percentage. This defines the
maximum advisable ratio between the regulator's input and output voltage magnitudes.
For satisfactory performance, the maximum operating input voltage range must be equal to (32 – |VO|) volts.
As an example, Table 1 gives the operating input voltage range for the common output bus voltages. In addition,
the Electrical Characteristics define the available output voltage adjust range for various input voltages.
Table 1. Standard Values of Rset for Common Output
Voltages
VO
RSET
(Standard Value)
VO
(Actual)
Operating
VI Range
(Required)
–15 V
–12 V
–5 V
100 Ω
2 kΩ
–14.997 V
–12.006 V
–5.000 V
–3.303 V
9 V to 17 V
9 V to 20 V
9 V to 27 V
9 V to 28.7 V
28.7 kΩ
221 kΩ
–3.3 V
V
I
V
PTN78060A
2
1, 7
O
V
V
I
O
Adj
GND
4
6
+
C1
C2
C3
R
SET
+
0.05 W
1%
GND
GND
(1) A 0.05-W rated resistor may be used. The tolerance should be 1%, with a temperature stability of 100 ppm/°C (or
better). Place the resistor as close to the regulator as possible. Connect the resistor directly between pins 4 and 7
using dedicated PCB traces.
(2) Never connect capacitors from VO Adjust to either GND or VO. Any capacitance added to the VO Adjust pin affects the
stability of the regulator.
Figure 18. VO Adjust Resistor Placement
8
PTN78060A
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SLTS245A–APRIL 2005–REVISED MAY 2005
Table 2. Output Voltage Set-Point Resistor Values
VO Required
–15.0 V
–14.9 V
–14.8 V
–14.7 V
–14.6 V
–14.5 V
–14.4 V
–14.3 V
–14.2 V
–14.1 V
–14.0 V
–13.9 V
–13.8 V
–13.7 V
–13.6 V
–13.5 V
–13.4 V
–13.3 V
–13.2 V
–13.1 V
–13.0 V
–12.9 V
–12.8 V
–12.7 V
–12.6 V
–12.5 V
–12.4 V
–12.3 V
–12.2 V
–12.1 V
–12.0 V
RSET
99 Ω
VO Required
–11.9 V
–11.8 V
–11.7 V
–11.6 V
–11.5 V
–11.4 V
–11.3 V
–11.2 V
–11.1 V
–11.0 V
–10.9 V
–10.8 V
–10.7 V
–10.6 V
–10.5 V
–10.4 V
–10.3 V
–10.2 V
–10.1 V
–10.0 V
–9.9 V
RSET
VO Required
–8.8 V
–8.6 V
–8.4 V
–8.2 V
–8.0 V
–7.8 V
–7.6 V
–7.4 V
–7.2 V
–7.0 V
–6.8 V
–6.6 V
–6.4 V
–6.2 V
–6.0 V
–5.8 V
–5.6 V
–5.4 V
–5.2 V
–5.0 V
–4.8 V
–4.6 V
–4.4 V
–4.2 V
–4.0 V
–3.8 V
–3.6 V
–3.4 V
–3.2 V
–3.0 V
RSET
2.09 kΩ
2.18 kΩ
2.27 kΩ
2.36 kΩ
2.45 kΩ
2.55 kΩ
2.65 kΩ
2.75 kΩ
2.82 kΩ
2.96 kΩ
3.07 kΩ
3.18 kΩ
3.29 kΩ
3.41 kΩ
3.53 kΩ
3.65 kΩ
3.78 kΩ
3.91 kΩ
4.04 kΩ
4.18 kΩ
4.33 kΩ
4.47 kΩ
4.62 kΩ
4.78 kΩ
4.94 kΩ
5.10 kΩ
5.27 kΩ
5.45 kΩ
5.63 kΩ
5.82 kΩ
6.01 kΩ
6.21 kΩ
6.63 kΩ
7.09 kΩ
7.58 kΩ
8.11 kΩ
8.68 kΩ
9.30 kΩ
9.98 kΩ
10.7 kΩ
11.5 kΩ
12.4 kΩ
13.4 kΩ
14.6 kΩ
15.8 kΩ
17.3 kΩ
18.9 kΩ
20.7 kΩ
22.9 kΩ
25.6 kΩ
28.7 kΩ
32.5 kΩ
37.2 kΩ
43.4 kΩ
51.6 kΩ
63.0 kΩ
80.1 kΩ
109 kΩ
166 kΩ
338 kΩ
OPEN
147 Ω
196 Ω
245 Ω
296 Ω
347 Ω
400 Ω
453 Ω
507 Ω
562 Ω
619 Ω
676 Ω
734 Ω
794 Ω
854 Ω
916 Ω
979 Ω
1.04 kΩ
1.11 kΩ
1.18 kΩ
1.24 kΩ
1.31 kΩ
1.38 kΩ
1.46 kΩ
1.52 kΩ
1.60 kΩ
1.68 kΩ
1.76 kΩ
1.84 kΩ
1.92 kΩ
2.01 kΩ
–9.8 V
–9.7 V
–9.6 V
–9.5 V
–9.4 V
–9.3 V
–9.2 V
–9.1 V
–9.0 V
–8.9 V
9
PTN78060A
www.ti.com
SLTS245A–APRIL 2005–REVISED MAY 2005
CAPACITOR RECOMMENDATIONS FOR THE PTN78060 WIDE-OUTPUT
ADJUST POWER MODULES
Input Capacitor
The minimum requirement for the input bus is 100 µF of nonceramic capacitance and 14.1 µF (3× 4.7 µF) of
ceramic capacitance, in either an X5R or X7R temperature characteristic. Ceramic capacitors should be located
within 0.5 inch (1,27 cm) of the regulator's input pins. Electrolytic capacitors can be used at the input, but only in
addition to the required ceramic capacitance. The minimum ripple current rating for any nonceramic capacitance
must be 350 mA rms. The ripple current rating of electrolytic capacitors is a major consideration when they are
used at the input. This ripple current requirement can be reduced by placing more ceramic capacitors at the
input, in addition to the minimum required 14.1 µF.
Tantalum capacitors are not recommended for use at the input bus, as none were found to meet the minimum
voltage rating of 2 × (maximum dc voltage + ac ripple). The 2× rating is standard practice for regular tantalum
capacitors to ensure reliability. Polymer-tantalum capacitors are more reliable, and are available with a maximum
rating of typically 20 V. These can be used with input voltages up to 16 V.
Output Capacitor
The minimum capacitance required to ensure stability is a 100-µF capacitor. Either ceramic or electrolytic-type
capacitors can be used. The minimum ripple current rating for the nonceramic capacitance must be at least
200 mA rms. The stability of the module and voltage tolerances is compromised if the capacitor is not placed
near the output bus pins. A high-quality, computer-grade electrolytic capacitor should be adequate. A ceramic
capacitor can be also be located within 0.5 inch (1,27 cm) of the output pin.
For applications with load transients (sudden changes in load current), the regulator response improves with
additional capacitance. Additional electrolytic capacitors should be located close to the load circuit. These
capacitors provide decoupling over the frequency range, 2 kHz to 150 kHz. Aluminum electrolytic capacitors are
suitable for ambient temperatures above 0°C. For operation below 0°C, tantalum or Os-Con-type capacitors are
recommended. When using one or more nonceramic capacitors, the calculated equivalent ESR should be no
lower than 10 mΩ (17 mΩ using the manufacturer's maximum ESR for a single capacitor). A list of recommended
capacitors and vendors are identified in Table 3.
Ceramic Capacitors
Above 150 kHz, the performance of aluminum electrolytic capacitors becomes less effective. To further reduce
the reflected input ripple current, or improve the output transient response, multilayer ceramic capacitors must be
added. Ceramic capacitors have low ESR, and their resonant frequency is higher than the bandwidth of the
regulator. When placed at the output, their combined ESR is not critical as long as the total value of ceramic
capacitance does not exceed 200 µF.
Tantalum Capacitors
Tantalum-type capacitors may be used at the output and are recommended for applications where the ambient
operating temperature can be less than 0°C. The AVX TPS, Sprague 593D/594/595, and Kemet
T495/T510/T520 capacitors series are suggested over many other tantalum types due to their rated surge, power
dissipation, and ripple current capability. As a caution, many general-purpose tantalum capacitors have
considerably higher ESR, reduced power dissipation, and lower ripple current capability. These capacitors are
also less reliable as they have lower power dissipation and surge current ratings. Tantalum capacitors that do not
have a stated ESR or surge current rating are not recommended for power applications. When specifying
Os-Con and polymer-tantalum capacitors for the output, the minimum ESR limit is encountered well before the
maximum capacitance value is reached.
Capacitor Table
The capacitor table, Table 3, identifies the characteristics of capacitors from vendors with acceptable ESR and
ripple current (rms) ratings. The recommended number of capacitors required at both the input and output buses
is identified for each capacitor type. This is not an extensive capacitor list. Capacitors from other vendors are
available with comparable specifications. Those listed are for guidance. The rms rating and ESR (at 100 kHz) are
critical parameters necessary to ensure both optimum regulator performance and long capacitor life.
10
PTN78060A
www.ti.com
SLTS245A–APRIL 2005–REVISED MAY 2005
Designing for 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
required 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 of
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 those specified in the data sheet, the selection of output
capacitors becomes more important. Review the minimum ESR in the characteristic data sheet for details on the
capacitance maximum.
Table 3. Recommended Input/Output Capacitors
CAPACITOR CHARACTERISTICS
QUANTITY
85°C
EQUIVALENT
CAPACITOR VENDOR/
COMPONENT
SERIES
VENDOR
NUMBER
WORKING
VOLTAGE
(V)
MAXIMUM
PHYSICAL
SIZE
(mm)
VALUE
(µF)
SERIES
RESISTANCE
(ESR) (Ω)
INPUT OUTPUT
RIPPLE
CURRENT
(IRMS) (mA)
BUS
BUS
FC( Radial)
35
35
16
100
100
180
0.117
0.015
0.016
555
670
8 x 11,5
10 x10,2
8 x 12
≥1
≥1
1
1
EEUFC1V01
FC (SMD)
EEVFC1V101P
United Chemi-Con PXA (SMD)
4360
≤1
PXA16VC180MF60 (VI, |VO| <
14 V)
(1)
≥1
(1)
PS
25
50
50
50
10
50
20
16
20
100
100
100
100
100
120
100
100
100
0.020
0.22
4300
485
10 x 12,5
8 x 12,5
10 x 10
10 x 10
7,7 x 4,3
10 x12,5
8 x 12
≥1
≤ 1
1
10PS100MJ12 (VI < 22V)
LXZ50VB101M8X12LL
MVY50VC101M10X10TP
UWG1H101MNR1GS
F551A107MN (|VO| ≤ 5 V)
UHD1H151MHR
(1)
LXZ
≥1
MVY(SMD)
0.300
0.300
0.055
0.072
0.024
0.032
0.085
500
≥1
≥1
1
Nichicon UWG (SMD)
F550 (Tantalum)
HD
500
1
(1)
2000
979
N/R
≥1
≤ 3(2)
1
(1)
(1)
(3)
Sanyo Os-Con SVP (SMD)
SP
2500
2890
1543
≥1
≥ 1
N/R
≤ 1
≤ 1
≤ 3
20SVP100M (VI ≤ 16 V)
16SP100M (VI, |VO| ≤ 14 V)
10 x 5
7,3 L x 4,3
W x 4,1 H
TPSV107M020R0085
(|VO| ≤ 10 V)
AVX Tantalum TPS (SMD)
(3)
(1)
(1)
(4)
(4)
(4)
(4)
20
16
6.3
25
25
25
25
100
47
0.200
0.002
0.002
0.002
0.002
0.002
0.002
> 817
>1000
>1000
>1000
>1000
>1000
>1000
N/R
≥3
≤ 3
≤ 3
≤ 3
1
TPSE107M020R0200
(|VO| ≤ 10 V)
Murata X5R Ceramic
Murata X5R Ceramic
TDK X7R Ceramic
Murata X7R Ceramic
Kemet X7R Ceramic
AVX X7R Ceramic
3225
3225
3225
3225
3225
3225
GRM32ER61C476M
(VI, |VO| ≤ 13.5 V)
47
N/R
≥ 6
≥ 6
≥ 6
≥ 6
GRM42-2X5R476M6.3
(|VO| ≤ 5.5 V)
2.2
2.2
2.2
2.2
C3225X7R1E225KT/MT
(VI ≤ 20 V)
1
GRM32RR71E225K
(VI ≤ 20 V)
1
C1210C225K3RAC
(VI ≤ 20 V)
1
C12103C225KAT2A
(VI ≤ 20 V)
Murata X7R Ceramic
TDK X7R Ceramic
50
50
50
4.7
2.2
2.2
0.002
0.002
0.004
>1000
>1000
>1000
3225
3225
≥ 3
1
1
1
GRM32ER71H475KA88L
C3225X7R1H225KT
≥ 6
≥ 6
Murata Radial Through-hole
10 H x 10 W
x 4 D
RPER71H2R2KK6F03
(1) The voltage rating of the input capacitor must be selected for the desired operating input voltage range of the regulator. To operate the
regulator at a higher input voltage, select a capacitor with the next higher voltage rating.
(2) The maximum voltage rating of the capacitor must be selected for the desired set-point voltage (VO ). To operate at a higher output
voltage, select a capacitor with a higher voltage rating.
(3) Not recommended (N/R). The voltage rating does not meet the minimum operating limits in most applications.
(4) The maximum rating of the ceramic capacitor limits the regulator's operating input voltage to 20 V. Select an alternative ceramic
component to operate at a higher input voltage.
11
PTN78060A
www.ti.com
SLTS245A–APRIL 2005–REVISED MAY 2005
Power-Up Characteristics
When configured per the standard application, the PTN78060A power module produces a regulated output
voltage following the application of a valid input source voltage. During power up, internal soft-start circuitry slows
the rate that the output voltage rises, thereby limiting the amount of in-rush current that can be drawn from the
input source. The soft-start circuitry introduces a short time delay (typically 5 ms – 10 ms) into the power-up
characteristic. This is from the point that a valid input source is recognized. Figure 19 shows the power-up
waveforms when operating from a 12-V input and with the output voltage adjusted to –5-V. The waveforms were
measured with a 2.8-A resistive load.
V (5 V/div)
I
V
O
(2 V/div)
I (2 A/div)
I
t - Time = 5 ms/div
Figure 19. Power-Up Waveforms
Undervoltage Lockout
The undervoltage lockout (UVLO) circuit prevents the module from attempting to power up until the input voltage
is above the UVLO threshold. This is to prevent the module from drawing excessive current from the input source
at power up. Below the UVLO threshold, the module is held off.
Current Limit Protection
The module is protected against load faults with a continuous current limit characteristic. Under a load-fault
condition, the output current increases to the current limit threshold. Attempting to draw current that exceeds the
current limit threshold causes the module to progressively reduce its output voltage. Current is continuously
supplied to the fault until the fault is removed. Once it is removed, the output voltage promptly recovers. When
limiting output current, the regulator experiences higher power dissipation, which increases its temperature. If the
temperature increase is excessive, the module's overtemperature protection begins to periodically turn the output
voltage off.
Overtemperature Protection
A thermal shutdown mechanism protects the module's internal circuitry against excessively high temperatures. A
rise in temperature may be the result of a drop in airflow, a high ambient temperature, or a sustained current limit
condition. If the internal temperature rises excessively, the module turns itself off, reducing the output voltage to
zero. The module exercises a soft-start power up when the sensed temperature has decreased by about 10°C
below the trip point.
NOTE: Overtemperature protection is a last-resort mechanism to prevent damage to the module. It should not be
relied on as permanent protection against thermal stress. Always operate the module within its temperature
derated limits, for the worst-case operating conditions of output current, ambient temperature, and airflow.
Operating the module above these limits, albeit below the thermal shutdown temperature, reduces the long-term
reliability of the module.
12
PTN78060A
www.ti.com
SLTS245A–APRIL 2005–REVISED MAY 2005
Optional Input/Output Filters
Power modules include internal input and output ceramic capacitors in all of their designs. However, some
applications require much lower levels of either input reflected or output ripple/noise. This application describes
various filters and design techniques found to be successful in reducing both input and output ripple/noise.
Input/Output Capacitors
The easiest way to reduce output ripple and noise is to add one or more 1-µF ceramic capacitors, such as C5
shown in Figure 20. Ceramic capacitors should be placed close to the output power terminals. A single 1-µF
capacitor reduces the output ripple/noise by 10% to 30% for modules with a rated output current of less than 3 A.
(Note: C4 is required to improve the regulators transient response, and does not reduce output ripple and noise.)
Switching regulators draw current from the input line in pulses at their operating frequency. The amount of
reflected (input) ripple/noise generated is directly proportional to the equivalent source impedance of the power
source including the impedance of any input lines. The addition of C1, minimum 1-µF ceramic capacitor, near the
input power pins, reduces reflected conducted ripple/noise by up to 20%.
V
V
O
2
1, 7
I
PTN78060A
V
V
I
O
GND
Adjust
6
4
#
C1
C2
C3*
C5
C4
100 mF
(Required)
R
SET
1 mF
100 mF
3 x 4.7 mF
Ceramic
1 mF
Ceramic
Electrolytic
(Required)
Ceramic
(Required)
GND
GND
* See the specifications for required value and type.
# See the Application Information for suggested value and type.
Figure 20. Adding High-Frequency Bypass Capacitors to the Input and Output
π Filters
If a further reduction in ripple/noise level is required for an application, higher order filters must be used. A π (pi)
filter, employing a ferrite bead (Fair-Rite Pt. No. 2673000701 or equivalent) in series with the input or output
terminals of the regulator reduces the ripple/noise by at least 20 db (see Figure 21 and Figure 22). In order for
the inductor to be effective ceramic capacitors are also required. (See the Capacitor Recommendations for
additional information on vendors and component suggestions.)
These inductors plus ceramic capacitors form an excellent filter because of the rejection at the switching
frequency (650 kHz - 1 MHz). The placement of this filter is critical. It must be located as close as possible to the
input or output pins to be effective. The ferrite bead is small (12,5 mm × 3 mm), easy to use, low cost, and has
low dc resistance. Fair-Rite also manufactures a surface-mount bead (part number 2773021447). It is rated to 5
A, and can be used on the output bus. As an alternative, suitably rated 1-µH to 5-µH wound inductors can be
used in place of the ferrite inductor bead.
13
PTN78060A
www.ti.com
SLTS245A–APRIL 2005–REVISED MAY 2005
L1
L2
1 - 5 mH
1 - 5 mH
V
V
O
2
1, 7
I
PTN78060A
V
V
O
I
GND
Adjust
6
4
#
C1
C2
C3*
C5
1 mF
Ceramic
†
C4
100 mF
(Required)
C6
R
1 mF
100 mF
3 x 4.7 mF
Ceramic
SET
Ceramic
Electrolytic
(Required)
(Required)
GND
GND
* See the specifications for required value and type.
# See the Application Information for suggested value and type.
† Recommended when I is greater than 2 A.
O
Figure 21. Adding π Filters (IO ≤ 3 A)
45
40
35
1 MHz
30
25
20
15
10
600 kHz
0
0.5
1
1.5
2
2.5
3
Load Current − A
Figure 22. π-Filter Attenuation vs. Load Current
14
PACKAGE OPTION ADDENDUM
www.ti.com
19-Aug-2005
PACKAGING INFORMATION
Orderable Device
PTN78060AAH
PTN78060AAS
PTN78060AAST
PTN78060AAZ
PTN78060AAZT
Status (1)
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
Drawing
DIP MOD
ULE
EUW
7
7
7
7
7
36
TBD
TBD
TBD
Call TI
Call TI
Call TI
Call TI
Call TI
Level-1-235C-UNLIM
Level-1-235C-UNLIM
Level-1-235C-UNLIM
Level-3-260C-168 HR
Level-3-260C-168 HR
DIP MOD
ULE
EUY
EUY
EUY
EUY
36
DIP MOD
ULE
250
36
DIP MOD
ULE
Pb-Free
(RoHS)
DIP MOD
ULE
250
Pb-Free
(RoHS)
(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.
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Addendum-Page 1
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