DC-DC adapter

We try to have various DC-DC adapters available at the CommonsLab. There are different kinds, which usually can accept a range of input voltage and convert it to a given output voltage.

Buck / Step-Down

They take a higher DC voltage and convert them to a lower DC voltage (e.g. 6V-12V -> 5V).

Boost / Step-Up

They take a lower DC voltage and convert it to a higher DC voltage (e.g. 3V-20V -> 24V).

Buck-Boost

They take a voltage, which can be both higher or lower than the output voltage (e.g. 5V-20V -> 12V).

Some DC-DC adapters can provide a constant output current rather than a constant output voltage. Even others can limit both the output voltage and the output current to a given maximum level (e.g. see first item).

5A / 30V constant-current / constant-voltage

This version acts both as an adjustable constant voltage supply but has also an adjustable current limit.

Input voltage

5V-32V

Output voltage

0.8V-30V

Output current

max. 5A (Beware of overheating!)

Conversion efficiency

< 95%

Switching frequency

300KHz

Output ripple

< 50mV (max)

Current accuracy

± 0.5%

Voltage accuracy

± 2.5%

Operating Temperature

-40°C to +85°C

Size

51mm x 26mm x 14mm (L x W x H)

1.5A / 17V constant-voltage

Input voltage

4.75V-23V

Output voltage

1V-17V

Output current

max. 1.5A (Beware of overheating! / 0.5s peak: 3A)

Conversion efficiency

< 95%

Switching frequency

340KHz

Output ripple

30mV (no load!)

Voltage accuracy

± 2.5%

Size

17mm x 11mm x 3.8mm (L x W x H)

3A / 1V-20V constant-voltage

Input voltage

4.75V-28V

Output voltage

1V-20V

Output current

max. 3A (Beware of overheating!)

Conversion efficiency

< 96%

Switching frequency

~1MHz

Output ripple

< 30mV

Size

22mm x 17mm x 4mm (L x W x H)

0.6A / 3.3V step-down LDO low-quiescent-current constant-voltage

Input voltage

3.3V-6.0V

Output voltage

3.3V

Output current

max. peak 2.0A (Beware of overheating!)

Conversion efficiency

< 95%

Switching frequency

1500KHz

Output ripple

50mVpp (full load)

Voltage accuracy

± 100mV

No-load current IQ

0.2mA

Shutdown current (EN pulled low)

<10uA

Size

15mm x 12.5mm x 4.5mm (L x W x H)

Examples

Input 3x battery (NiMH,NiCd,alkaline) (3x 1.1V-1.5V = 3.6-4.5V)

Output ESP8266 E-12 (< 180mA) or NodeMCU (< 300mA)

Input Li-Ion battery (3.3-4.1V)

Output ESP8266 E-12 (< 180mA) or NodeMCU (< 300mA)

650mA constant-current step-up LED driver

Input voltage

3.2V-36V (Input voltage should not be much more than output voltage.)

Output current

max. 2A (Beware of overheating!)

Output voltage

1V-50V

Output current

~ 650mA

Conversion efficiency

< 90%

Size

30MM x 13.5mm x 5.5mm (L x W x H)

Examples

Input Li-Ion Battery (3.7V), max. 2A -> max. ~ 7W

Output 3 white 3W LEDs in series (3 x ~3.3V = ~10V), 650mA, ~6.5W

Input 12V, max. 2A -> max. ~ 24W

Output 10 white 3W LEDs in series (10 x ~3.3V = ~33V), 650mA, ~21W