AATIAN18 Datasheet, PDF (2/5 Pages) SiGe Semiconductor, Inc. – 1MHz 0.4A Buck Converter

EV-106
AAT1143EVAL
1MHz 0.4A Buck Converter
Figure 2: AAT1143 Evaluation
Board PCB Top Side.
Figure 3: AAT1143 Evaluation
Board PCB Bottom Side.
Test Equipment
INTERNAL DOCUMENT ^{1. 6.0V 1.0A laboratory power supply: HP33401A or equivalent.}
2. DC 0 to 0.4A electronic load, capable of operation down to 0.6V: Keithley 2400 or equivalent. (When
DO NOT COPY ^{using the Keithley 2400, set the meter to operate in voltage source mode and set the load current by}
varying the current compliance [maximum current] of the meter.)
3. DC voltmeter: HP34401A or equivalent.
4. Oscilloscope: Tektronix TDS744A or equivalent.
Setup and Test
A: Load and Line Regulation (see connection diagram in Figure 4)
1. Short (apply jumper to) Pins 2 and 3 of the enable connector.
2. Apply a DC power supply and DC voltmeter across input voltage terminals: V_IN (positive terminal) and
GND (negative terminal or return).
3. Apply a DC load and DC voltmeter to output terminals V_OUT and GND.
4. Vary the load from 0 to 0.4A and the input voltage from 2.7V to 5.5V while monitoring the output voltage.
5. The output voltage as measured at the output terminals of the evaluation boards should not vary by
more than ±1% of the nominal voltage.
B: Short-Circuit and Over-Temperature Protection
1. Raise the input voltage to 5.5V.
2. Apply a short from V_OUT to GND at the evaluation board terminals.
3. Remove the short and verify that output returns to its initial value.
C: Enable Input
1. Remove the jumper from Pins 2 and 3 of the enable connector and apply to Pins 1 and 2. The output
should decay to zero.
2. Remove the short and replace the short from Pins 2 to 3 of the enable connector. The output should
recover to its initial value.
2
EV-106.2005.04.1.1