ST8433 STANSON | Alldatasheet
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Technical content
STANSON TECHNOLOGY ST8433 (Pb-Free) Constant Voltage and Constant Current Controller
120 Bentley Square, Mountain View, Ca 94040 USA
WWW.STANSONTECH.COM
DESCRIPTION
The ST8433 is high-voltage four-terminal adjustable voltage references, with over current protection feature. The ST8433 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. ST8433 is idea for low cost switching power supply application. PIN CONFIGURATION TO-92-4 FEATURE z Voltage Reference Accuracy of 1% z Sink Current Capability from 1mA to 100mA z Adjustable Output Voltage from V REF to 18V z Low Output Noise z Typical Output Dynamic Impedance Less Than 200mΩ z Available in SOT23-5 and TO92-4 package z Over Current Protection
APPLICATIONS
R: Reference A: Anode C: Cathode P: Current Enable YY: Year WW: Week SOT-23-5L Y: Year Code W: WEEK ST8433 2009 V1
STANSON TECHNOLOGY ST8433 (Pb-Free) Constant Voltage and Constant Current Controller WWW.STANSONTECH.COM
ORDERING INFORMATION
Part Number Voltage Tolerance Package Part Marking ST8433ATRG 0.5% TO92-4 ST433A ST8433BTRG 1.0% TO92-4 ST433B ST8433ASRG 0.5% SOT23-5L 33xxA ST8433BSRG 1.0% SOT23-5L 33xxB Week Code : A ~ Z ; a ~ z ST8433XTTG S : SOT23-5L ; T : TO92-4 ; T : Tape Box ; G : Pb – Free Block Diagram ABSOULTE MAXIMUM RATINGS (TA=25℃ Unless Otherwise Specified) Rating Symbol Values Units Cathode Voltage VZ 18 V Continuous Cathode Current Range IZ 150 mA Reference Current Range IREF 10 mA Operating Junction Temperature Range TJ -40 to +150 ℃ Storage Temperature Range TSTG -65 to 150 ℃ Lead Temperature Range (Soldering 10Sec) TSOL 260 ℃ Thermal Resistance θJA 140 ℃/W The IC has protection Circuit sgsinst static electricity. Do not apply high static electricity or high voltage that exceeds the performance of the protection circuit to the IC. ST8433 2009 V1
STANSON TECHNOLOGY ST8433 (Pb-Free) Constant Voltage and Constant Current Controller WWW.STANSONTECH.COM ST8433 2009 V1 ELECTRICAL CHARACTERISTICS (TA=25℃ Unless Otherwise Specified) Parameter Symbol Conditions Min Typ Max Units Reference Input Voltage (IK=10mA,VZ=VREF) VREF ST8433A ST8433B 2.487 2.475 2.5 2.5 2.513 2.525 V VREF Temp Deviation VDEV TA=-40℃~+80℃ VZ=VREF IZ=10mA 10 25 mV Ratio Of Change In REF To Change In Cathode Voltage △VREF/ △VZ IZ=10mA, △VZ = 18V~VREF -1.4 -2.7 mV/V Reference Input Current IREF IZ=10mA R1=10KΩ R2=∞ 1 uA IREF Temp Deviation IREF(DEV) TA=-40℃~+80℃ R1=10KΩ , R2=∞ IZ=10mA 2.5 uA Off-State Cathode Current IZ(OFF) V REF=0V , VZ=18V 0.1 uA Dynamic Output Impedance RZ f<1kHz , VZ=VREF IZ=1mA~100mA 1.0 1.5 Ω Minimum Operating Current Iz(MIN) VZ=VREF 1.0 mA Current Amplification Iamp VC=1V, IA=50uA 10 mA Saturation Voltage Vsat Ic=150mA, IA=10mA 0.8 V Maximum Protection Current IP 100 mA
STANSON TECHNOLOGY ST8433 (Pb-Free) Constant Voltage and Constant Current Controller WWW.STANSONTECH.COM APPLICATION CIRCUIT APPLICATION NOTE In the above application, ST8433 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: Rsense x I-limit = 0.7V (typical) Where I-limit is the desired current limit. The selection of Rsense should consider the power loss through Rsense. It is calculated as: P-limit = 0.7 x I-limit Whether AC input is at High Line or Low Line, ST8433 can provide the same current protection. It has the fuse function at the output. ST8433 2009 V1
STANSON TECHNOLOGY ST8433 (Pb-Free) Constant Voltage and Constant Current Controller WWW.STANSONTECH.COM TO92-4 PACKAGE OUTLINE SOT-23-5L PACKAGE OUTLINE ST8433 2009 V1
STANSON TECHNOLOGY ST8433 (Pb-Free) Constant Voltage and Constant Current Controller WWW.STANSONTECH.COM ST8433 2009 V1