Another one:
DC to DC Converter Constant Voltage Current Regulators Output 0-3A 1.25-30V | eBay
Properties: non-isolated step-down constant current, constant voltage module (CC CV) charging module
Scope: High-power constant current LED driver, battery charger (including ferroelectric), 4V, 6V, 12V, 14V, 24V battery charging, nickel-cadmium nickel-metal hydride
batteries (battery) charger, solar panels, wind turbines
Input voltage: 7-35V,
Output voltage: 1.25-30V adjustable
Output Current: 3A (more than 15W, please install heat sink, this item do not include HEAT SINK)
Constant current range :0-3A (adjustable)
revolving light current: constant current value * (0.1),
such as the constant current value is 3A, revolving light current is set to constant current of 0.1 times (0.1 * 3A = 0.3A), when adjusted constant current value to 2A, then revolving light current is constant current of 0.1 times (0.1 * 2A = 0.2A). this version is 0.1 times fixed
Feature:
Dropout voltage: 2V
Output power: natural cooling 15W, 25W with heat sink
Conversion efficiency: 90% (up to 90% (the higher the output voltage, the higher the efficiency)
Output ripple: 20M bandwidth (for reference)
Input 12V Output 5V 3A 60mV (MAX)
Operating Temperature: Industrial (-40 ℃ to +85 ℃) (ambient temperature exceeds 40 ℃, lower power use, or to enhance heat dissipation)
Full load temperature rise: 45 ℃
No-load current: Typical 10mA (12V switch 4.2V)
Load regulation: ± 1%
Voltage regulation: ± 0.5%
Constant accuracy and temperature: the actual test, the module temperature changes from 20 ℃ to 100 ℃, less than 1% change constant current value (constant current value 1A)
Dynamic response speed: 5% 200uS
Potentiometer adjustment direction: clockwise (increase), counterclockwise (decrease),
potentiometer close to the input is Voltage regulation (CV),
potentiometer close to the output is current regulate (CC),
Indicator: two-color LED charging indicator light red, fully charged light green (do not connect load light green)
Output short circuit protection: Yes, constant current (constant current setting values)
Input reverse polarity protection: Yes,
Output to prevent reflux: Yes, the output has an internal series a diode to prevent reflux.
Connection: Welding, plus pin can be directly soldered to a PCB
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
And another
:
2x LED driver with constant current power supply step-down | eBay
Output voltage: adjustable (1.25-30V no load adjustment) Our default shipping 4.2V voltage regulator for other voltage can be their own (or tell the shopkeeper.)
Output current: rated 3A, the largest 4A (more than 15W, please install the heat sink)
Constant current range :0-4A (adjustable)
