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4825

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Parameters

Technical/Catalog Information4825
VendorKeystone Electronics
CategoryHardware, Fasteners, Accessories
Between Board Height 1.625" (41.3mm) 1 5/8"
ColorNatural
Length - Overall1.875" (47.6mm) 1 7/8"
MaterialNylon
Plating-
Size0.250" (6.4mm) 1/4" Hex
Thread/Screw/Hole Size6-32 Thread
TypeHex Threaded, Male/Female
Lead Free StatusLead Free
RoHS StatusRoHS Compliant
Other Names 4825
4825
4825K ND
4825KND
4825K

Product Manufacturers Pack D/C
4825 - - -

Pinout/Connection Diagram

4825 Circuit 
Battery chargers are usually designed without regard for efficiency, but the heat generated by low-efficiency chargers can present a problem. For those applications, the charger shown in the figure delivers 2.5 A with efficiency as high as 96 percent. It can charge a battery of one to six cells while operating from a car battery. IC1 is a buck-mode switching regulator that controls the external power switch, Q1, and the synchronous rectifier. IC1 includes a charge pump for generating the positive gate-drive voltage required by Q1. The battery-charging current develops a voltage across the 25-MΩ resistor (R3) that is amplified by the op amp and presented as positive-voltage feedback to IC1. This feedback enables the chip to maintain the charging current at 2.5 A. While charging, the circuit can also supply current to a separate load, up to a limit set by current-sense transformer T1 and sense resistor R1. T1 improves efficiency by lowering power dissipation in R1. The transformer turns ratio (1:70) routes only 1/70 of the total battery-plus-load current through R1, creating a feed-back voltage that enables IC1 to limit the overall current to a level compatible with the external components.

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PDF / Datasheet

48250-000 PDF Download

48250-000

File Size: 388490 KB
Manufacturer: ETC [ETC]

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