Difference between revisions of "DC-DC adapter"
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m (Jann moved page Step-down DC-DC adapter to DC-DC adapter: Also list Step-Up converters) |
(Step-Up LED driver) |
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| − | We try to have various [[ | + | We try to have various [[DC-DC adapter]]s 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 == | == 5A / 30V constant-current / constant-voltage == | ||
| Line 17: | Line 23: | ||
== 1.5A / 17V constant-voltage == | == 1.5A / 17V constant-voltage == | ||
| − | |||
[[Image:...jpg|thumb|right]] | [[Image:...jpg|thumb|right]] | ||
;Input voltage: 4.75V-23V | ;Input voltage: 4.75V-23V | ||
| Line 27: | Line 32: | ||
;Voltage accuracy: ± 2.5% | ;Voltage accuracy: ± 2.5% | ||
;Size: 17mm x 11mm x 3.8mm (L x W x H) | ;Size: 17mm x 11mm x 3.8mm (L x W x H) | ||
| + | |||
| + | == 650mA constant-current step-up LED driver == | ||
| + | [[Image:3W-LED-driver.jpg|thumb|right]] | ||
| + | ;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 | ||
Revision as of 14:55, 23 November 2017
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 (min, no load)
- Voltage accuracy
- ± 2.5%
- Size
- 17mm x 11mm x 3.8mm (L x W x H)
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