LTC3115EDHD-2 datasheet(2/6 Pages) LINER

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dc2119af

DEMO MANUAL DC2119A

Quick start proceDure

Using short twisted pair leads for any power connections

and with all loads and power supplies off, refer to Figure 4

for the proper measurement and equipment setup. The

Battery/Power Supply (PS1) should not be connected to

the circuit until told to do so in the procedure below.

When measuring the input or output voltage ripple, care

must be taken to avoid a long ground lead on the oscil-

loscope probe. Measure the input or output voltage ripple

by touching the probe tip directly across the VIN or VOUT

and GND terminals (see Figure 5), or by using an oscil-

loscope probe tip jack.

1. Jumper and PS1 settings to start:

PS1 = OFF

JP1 (PWM) = FIXED FREQUENCY

JP2 (RUN) = ON

2. With power OFF connect the power supply (PS1) as

shown in Figure 4. If accurate current measurements

are desired (for efficiency calculation for example) then

connect an ammeter in series with the supply as shown.

The ammeter is not required however.

3. Connect a 500mA load to VOUT as shown in Figure 2

(10Ω for VOUT = 5V). Connect an ammeter if accurate

current measurement or monitoring is desired.

4. Turn on PS1 and slowly increase voltage until the volt-

age at VIN is 4.0V.

5. Verify VOUT is ~5.0V.

6. VIN can now be varied between 2.7V and 40.0V. VOUT

should remain in regulation.

7. Load current (IOUT) can also be varied. The maximum

IOUT is a function of VIN and the current limit. Consult

the datasheet for more information on IOUT vs VIN. In

general for VIN > 3.6V IOUT can be increased to 0.8A.

For VIN > 6V IOUT can be increased to 2A.

8. For operation in Burst Mode move Jumper JP1 to

BURST. IOUT is limited in Burst Mode. See the data

sheet for more information.

9. NOTE: If VOUT drops out of regulation, check to be sure

the maximum load has not been exceeded, or that VIN

is not below the minimum value for regulation (see data

sheet)

Figure 1. DC2119A Efficiency in PWM Mode

100

VIN (V)

LOAD = 500mA

LOAD = 1A

Figure 2. DC2119A Efficiency in Burst Mode

100

VIN (V)

LOAD = 50mA

LOAD = 100mA

LOAD = 200mA

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