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DESIGNING FOR VERY FAST LOAD TRANSIENTS

FEATURES OF THE PTH FAMILY OF NON-ISOLATED WIDE OUTPUT ADJUST POWER

POLA ™COMPATIBILITY

PTH12030W/L

SLTS211F – MAY 2003 – REVISED FEBRUARY 2007

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 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 this data sheet, or the total amount of load

capacitance is above 3,000 µF, the selection of output capacitors becomes more important.

MODULES

The PTH/PTV family of nonisolated, 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 assured to be interoperable,

thereby providing customers with a 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

Input Bus

Adjust

On/Off

Over-

Prebias

Auto-

Margin

Output

Thermal

(Trim)

Inhibit

Current

Startup

Track™

Up/Down

Sense

Shutdown

3.3 V

6 A

•

•

•

•

•

PTHxx050

5 V

6 A

•

•

•

•

•

12 V

6 A

•

•

•

•

•

3.3 V / 5 V

10 A

•

•

•

•

•

•

•

PTHxx060

12 V

8 A

•

•

•

•

•

•

•

3.3 V / 5 V

15 A

•

•

•

•

•

•

•

PTHxx010

12 V

12 A

•

•

•

•

•

•

•

5 V

8 A

•

•

•

•

•

•

PTVxx010

12 V

8 A

•

•

•

•

•

•

•

3.3 V / 5 V

22 A

•

•

•

•

•

•

•

•

PTHxx020

12 V

18 A

•

•

•

•

•

•

•

•

5 V

18 A

•

•

•

•

•

•

•

PTHxx020

12 V

16 A

•

•

•

•

•

•

•

3.3 V/ 5 V

30 A

•

•

•

•

•

•

•

•

PTHxx030

12 V

26 A

•

•

•

•

•

•

•

•

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.

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