Application Notes

For technical support and further information visit http://power.ti.com

PTH Series of Wide-Output Adjust

Power Modules (3.3/5-V Input)

Features of the PTH Family of Non-Isolated

Wide Output Adjust Power Modules

Point-of-Load Alliance

The PTH family of non-isolated, wide-output adjust

power modules from Texas Instruments are optimized

for applications that require a flexible, high performance

module that is small in size. These products are part of

the “Point-of-Load Alliance” (POLA), which ensures

compatible footprint, interoperability and true second

sourcing for customer design flexibility. The POLA is a

collaboration between Texas Instruments, Artesyn Tech-

nologies, and Astec Power to offer customers advanced

non-isolated modules that provide the same functionality

and form factor. Product series covered by the alliance

includes the PTHxx050W (6 A), PTHxx060W (10 A),

PTHxx010W (15/12 A), PTHxx020W (22/18 A), and

the PTHxx030W (30/26 A).

From the basic, “Just Plug it In” functionality of the 6-A

modules, to the 30-A rated feature-rich PTHxx030W,

these products were designed to be very flexible, yet simple

to use. The features vary with each product. Table 3-1

provides a quick reference to the available features by

product and input bus voltage.

Table 3-1; Operating Features by Series and Input Bus Voltage

For simple point-of-use applications, the PTHxx050W

provides operating features such as an on/off inhibit,

output voltage trim, pre-bias startup (3.3/5-V input only),

and over-current protection. The PTHxx060W (10 A),

and PTHxx010W (15/12 A) include an output voltage

sense, and margin up/down controls. Then the higher

output current, PTHxx020W and PTHxx030W products

incorporate over-temperature shutdown protection. All

of the products referenced in Table 3-1 include Auto-

Track™. This is a feature unique to the PTH family,

and was specifically designed to simplify the task of se-

quencing the supply voltage in a power system. These

and other features are described in the following sections.

Soft-Start Power Up

The Auto-Track feature allows the power-up of multiple

PTH modules to be directly controlled from the Track

pin. However in a stand-alone configuration, or when

the Auto-Track feature is not being used, the Track pin

should be directly connected to the input voltage, Vin

(see Figure 3-1).

Figure 3–1

5 V

C

IN

1,000 µF

C

OUT

330 µF

GND

GND

3.3 V

R

SET, 698 Ω

0.1 W, 1 %

PTH05020W

7

10

4

5

6

2

3

98

Track

V

IN

V

O

GND

Inhibit

1

Up

Dn

Sense

Adjust

When the Track pin is connected to the input voltage the

Auto-Track function is permanently disengaged. This

allows the module to power up entirely under the control

of its internal soft-start circuitry. When power up is under

soft-start control, the output voltage rises to the set-point

at a quicker and more linear rate.

Figure 3–2

Vin (1 V/Div)

Vout (1 V/Div)

Iin (5 A/Div)

HORIZ SCALE: 5 ms/Div

Series

Input Bus

I OUT

3.3 V / 5 V

6 A

••••

•

12 V

6 A

•••

•

3.3 V / 5 V

10 A

••••

•••

12 V

8 A

•••

•••

3.3 V / 5 V

15 A

••••

•••

12 V

12 A

•••

•••

3.3 V / 5 V

22 A

••••

••••

12 V

18 A

•••

••••

3.3 V / 5 V

30 A

••••

••••

12 V

26 A

••••

••••

PTHxx030

PTHxx010

PTHxx020

PTHxx060

PTHxx050