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PDF SP433BS25RGB Data sheet ( Hoja de datos )
| Número de pieza | SP433BS25RGB | |
| Descripción | Constant Voltage and Constant Current Controller | |
| Fabricantes | SYNC Power | |
| Logotipo |  |
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SP433
Constant Voltage and Constant Current Controller
DESCRIPTION
The SP433 is high-voltage four-terminal adjustable
voltage references, with over current protection
feature. The SP433 is a one chip solution to a 2.5V
precision voltage reference and constant current output
in the application of secondary feedback control of
power supply, DC/DC converter, adaptor and charger.
SP433 is idea for low cost switching power supply
application.
APPLICATIONS
z Battery Charger
z Battery Power Equipment
z Linear Regulators
z Switch Power Supply
z Cellular Phone
z Digital Cameras
z Computer Disk Drivers
z Instrumentation
PIN CONFIGURATION
TO-94
FEATURES
z Voltage Reference Accuracy of 0.5% & 1.0%
z Sink Current Capability from 1mA to 100mA
z Adjustable Output Voltage from VREF to 18V
z Low Output Noise
z Typical Output Dynamic Impedance Less Than
200mΩ
z Available in SOT-23-5L and TO-94 package
z Over Current Protection
SOT-23-5L
PART MARKING
TO-94
SOT-23-5L
2009/03/16 Ver.1
Page 1
1 page  
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.
2009/03/16 Ver.1
Page 5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SP433BS25RGB.PDF ] | |
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