SP433AS25RGB datasheet(5/10 Pages) SYNC-POWER

Part #	SP433AS25RGB

Description	Constant Voltage and Constant Current Controller

PDF	10 Pages

Scroll/Zoom	100%

Manufacturer	SYNC-POWER [SYNC POWER Crop.]

Direct Link	http://www.syncpower.com

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5 / 10 page

2009/03/16

Ver.1

Page 5

SP433

Constant Voltage and Constant Current Controller

APPLICATION NOTE

In the above application, SP433 is used to provide an accurate control of voltage and current. The voltage loop is

controlled through an internal error amplifier, the resistor bridge R1, R2 and the photo-coupler. The relation

between Vout, R1, R2 and Vref is shown in:

Vout = Vref x (1+R1/R2)

The current loop is controlled through an internal transistor, the sense resistor and the photo-coupler. The control

equation is:

Risense X I-limit = 0.7V (typical)

Where I-limit is the desired current limit. The selection of Risense should consider the power loss through Risense. It

is calculated as:

P-limit = 0.7 X I-limit

Whether AC input is at High Line or Low Line, SP433 can provide the same current protection. It has the fuse

function at the output.

SP433AS25RGB Datasheet(PDF) 5 Page - SYNC POWER Crop.