September 17, 2017 A.03

AT SERIES (2” x 1” Package)

Up to 15 Watt DC-DC Converter

Operating Temperature Range

The AT series of converters operates over the wide temperature of

-405

℃to+85℃.Thismodulestartstoderateabove+78℃.Themodule

operate normally up to +105

℃casetemperature.

Output Voltage Adjustment

The output voltage on the T option models is adjustable within the range

of -10% to +10%.

Remote ON/OFF (Option)

Module with option P has Remote On/Off function. This feature allows the

user to switch the module on and off electronically. All models are

available in “positive logic” versions. The converter turns on if the

remote ON/OFF pin is high (>3.5Vdc or open circuit). Setting the pin low

(<1.2Vdc) will turn the converter off. The signal level of the remote on/off

input is defined with respect to ground. If not using the remote on/off pin,

leave the pin open (converter will be on).

UVLO (Under Voltage Lock Out)

Input under voltage lockout is standard on the AT unit. The unit will shut

down when the input voltage drops below a threshold, and the unit will

operate when the input voltage goes above the upper threshold.

Over Current Protection

All models have internal over current and continuous short circuit

protection. The unit operates normally once the fault condition is

removed. At the point of current limit inception, the converter will go into

hiccup mode protection.

Over Voltage Protection

The over-voltage protection consists of a Zener diode to limit the output

voltage.

Recommended Layout PCB Footprints and

Soldering Information

The end user of the converter must ensure that other components and

metal in the vicinity of the converter meet the spacing requirements to

which the system is approved. Low resistance and low inductance PCB

layout traces should be used where possible. Careful consideration must

also be given to proper low impedance tracks between power module,

input and output grounds. The recommended footprints and soldering

profiles are shown in the next two figures

Recommended PCB Layout Footprints, Dimensions are in inches (mm)

Wave Soldering Profiles

Note：

1. Soldering Materials: Sn/Cu/Ni

2. Ramp up rate during preheat: 1.4

℃/Sec(From50℃to100℃)

3. Soaking temperature: 0.5

℃/Sec(From100℃to130℃),60±20

seconds

4. Peak temperature: 260

℃,above250℃3~6Seconds

5. Ramp up rate during cooling: -10.0

℃/Sec(From260℃to150℃)

0

100

200

300

0

50

100

150

Time (Seconds)

Lead Free Wave Soldering Profile

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