Technical Reference Notes

APC18T12 Series

MODEL: APC18T12 SERIES

SHEET 4 OF 10

NOVEMBER 4, 2004 - REVISION 00

Electrical Specifications (continued)

OUTPUT SPECIFICATIONS

Parameter

Device

Symbol

Min

Typ

Max

Unit

Dynamic Response

Tantalum + 1uF Ceramic)

Load Change of 50% step

anywhere between 10% to 100%

of rated load

Peak Deviation

Peak deviation

∆I

All

-

-

-

-

-

-

2.5

250

100

-

300

150

A/

µs

mV

µs

Dynamic Response

x2 Special Polymer Aluminum

Capacitors)

Load Change of 50% step

anywhere between 10% to 100%

of rated load

Peak Deviation

Peak deviation

∆I

All

2.5

150

150

200

200

A/

µs

mV

µs

Output Voltage Trim Range

9

All

0.75

5.50

V

Remote Sense

10

All

-

10%

V

NOTE: 1. The converter is not internally fused. Recommended external fuse, Cooper Bussman 6125FA12A or

equivalent

2. External input capacitance required. See Figure 1.

4. Refer to Appendix A3 for the output ripple and Noise Test Measurement Setup.

5. Output current limited by 80W/Vo. Output Power Derating applies at elevated temperature. See Appendix

B for the Thermal Derating Curves.

6. OCP and OTP are in hiccup mode. The converter will auto restart without the need to recycle the input

voltage or toggle the enable signal and once the fault is removed. Vo higher than 1.5V, true OCP exists.

Vo less than 1.5V, OTP is used for OCP. Over current of not higher 150% for Vo less than 1.5V is

recommended. Typical overload condition is 150% or 27A. The module with Vo < 1.5V may not be

survival from over current exceeding 30A.

8. Load step response shall be measured at the load side of the output capacitors. See Appendix A4 for

the output and input cap requirement.

9. See appropriate Trim Equation and configuration in Appendix A6.

10. The combination of remote sense and output trim adjust cannot exceed 5.5V.