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1、深圳市惠新晨电子有限公司FP710328V, 3A Buck Constant Current Switching Regulatorfor White LEDGeneral DescriptionThe FP7103 is a PWM control buck converter designed to provide a simple, high efficiencysolution for driving high power LEDs. With a 0.25V reference voltage feedback control to minimizepower dissipatio
2、n, an external resistor sets the current as needed for driving various types of LEDs.The FP7103 includes a high current P-MOSFET to realize high efficiency and excellent transientcharacteristics. The PWM control circuit is able to change the duty ratio linearly from 0 up to 100%.Other features inclu
3、de user accessible EN pin for enabling, thermal shutdown, cycle-by-cycle currentlimit and over current protection.Features Wide Supply Voltage Operating Range: 3.6 to 28V Built-in P-MOSFET for 3A Loading Capability Precision Feedback Reference Voltage: 0.25V (2%) Low Current Consumption: 4mA Interna
4、l Fixed Oscillator Frequency: 320KHz (Typ.) Internal Soft-Start Function (SS) Over Current Protection Package: SOP-8L& SOP-8L(EP)Typical Application CircuitVINVCCLXLXFP7103ON/OFFENFBCOMPGNDGNDThis datasheet contains new product information.Feeling Technology reserves the rights to modify the product
5、 specification without notice.No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.Website:Rev. 0.941/12FP7103Function Block DiagramVCCENReferenceEnableControlRegulator2.50VOscillatorOver CurrentProtectionFB36KOutput Drive0. 25
6、V500Control CircuitsCOMPThermalInternal Soft StartShutdownCircuitGNDGNDLXLXThis datasheet contains new product information.Feeling Technology reserves the rights to modify the product specification without notice.No liability is assumed as a result of the use of this product. No rights under any pat
7、ent accompany the sales of the product.Website: Rev. 0.942/12FP7103Pin DescriptionsSOP- 8LTop ViewFB18EN286L-9FaFP71037VCC45COMP36NameNo.I / ODescriptionGNDFB1IError Amplifier Inverting InputGNDEN2IEnable ControlCOMP3OError Amplifier Compensation OutputLXVCC4PIC Power Supply (PMOS Source)LXLX5PPMOS
8、High Current OutputLX6PPMOS High Current OutputGND7OIC GroundGND8OIC GroundSOP-8L (EP)Top ViewFB18EN286L-9FaFP71037VCC45COMP36Bottom ViewEPGNDNameNo.I / ODescriptionFB1IError Amplifier Inverting InputGNDEN2IEnable ControlLXCOMP3OError Amplifier Compensation OutputVCC4PIC Power Supply (PMOS Source)LX
9、LX5PPMOS High Current OutputLX6PPMOS High Current OutputGND7OIC GroundGND8OIC GroundEP9PExposed PAD. Must connect to LXThis datasheet contains new product information.Feeling Technology reserves the rights to modify the product specification without notice.No liability is assumed as a result of the
10、use of this product. No rights under any patent accompany the sales of the product.Website: Rev. 0.943/12FP7103Marking InformationSOP-8L & SOP-8L (EP)FP7103Halogen FreeLot NumberInternal IDPer-Half MonthYearHalogen Free: Halogen free product indicatorLot Number: Wafer lot numbers last two digitsFor
11、Example: 132386TB 86Internal ID: Internal Identification CodePer-Half Month: Production period indicated in half month time unitFor Example: January A (Front Half Month), B (Last Half Month)February C (Front Half Month), D (Last Half Month)Year: Production years last digitThis datasheet contains new
12、 product information.Feeling Technology reserves the rights to modify the product specification without notice.No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.Website: Rev. 0.944/12FP7103Ordering InformationPart NumberOper
13、ating TemperaturePackageMOQDescriptionFP7103DR-LF-25C +85CSOP-8L2500EATape & ReelFP7103XR-LF-25C +85CSOP-8L (EP)2500EATape & ReelAbsolute Maximum RatingsParameterSymbolConditionsMin.Typ.Max.UnitPower Supply VoltageVIN28VOutput Source Current3AError Amplifier Inverting Input-0.3+1.2VAllowable Dissipa
14、tionTA+25650mWThermal Resistance Junction toJA+175 / WAmbientThermal Resistance Junction toJC+45 / WCaseESD SusceptibilityHBM (Human Body Mode)2KVMM (Machine Mode)200VStorage Temperature-55+125Lead Temperature (soldering, 10+260sec)IR Re-flow Soldering CurveThis datasheet contains new product inform
15、ation.Feeling Technology reserves the rights to modify the product specification without notice.No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.Website: Rev. 0.945/12FP7103Recommended Operating ConditionsParameterSymbolCon
16、ditionsMin.Typ.Max.UnitSupply VoltageVIN3.628VOperating Temperature-2585DC Electrical Characteristics (VCC=6V, TA= 25, unless otherwise noted)ParameterSymbolConditionsMin.Typ.Max.UnitReferenceOutput VoltageVREFFB connected to COMP0.2450.250.255VInput RegulationVREFVCC3.6 V to 25 V212.5mVOutput Volta
17、ge Change withVREF /TA-25 to +2512%TemperatureVREFTA+25 to +8512Oscillator SectionOscillation Frequencyf320KHzFrequency Change with Voltagef / VVCC=3.6V to 25V5%Frequency Change withf / TTA = -25 to +855%TemperatureError Amplifier SectionInput Bias CurrentIB-1.0-0.21.0AVoltage GainAv100V / VFrequenc
18、y BandwidthBWAv=0 dB6MHzOutput Voltage Swing PositiveVPOS1.72VOutput Voltage Swing NegativeVNEG0.10.2VOutput Source CurrentISOURCEVcomp=200mV-15-30AOutput Sink CurrentISINKVcomp=200mV1530AIdle Period Adjustment SectionMaximum Duty CycleTDUTYVFB =0.2V100%Output SectionPMOS D-S VoltageVDSSVCOMP=0.1V-2
19、0VPMOS Source CurrentID-3APMOS On ResistanceRDS (ON)VCC=5.0V, V FB=0V6487mVCC=10V, V FB=0V4052Output Leakage CurrentILVDS=-24V, VGS=0V-1AThermal Shutdown SectionThermal shutdown Temperature150Over Current Protection SectionPMOS OCP CurrentIOCP4AThis datasheet contains new product information.Feeling
20、 Technology reserves the rights to modify the product specification without notice.No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.Website: Rev. 0.946/12FP7103ParameterSymbolConditionsMin.Typ.Max.UnitTotal Device SectionEN
21、 Input CurrentIENEN pin Open20AUpper Threshold Voltage (EN)VUPPER1.12VLower Threshold Voltage (EN)VLOW0.87VHysteresisVHYS210250mVAverage Supply CurrentIAVE46mAVCC Shutdown CurrentIshutdown15AThis datasheet contains new product information.Feeling Technology reserves the rights to modify the product
22、specification without notice.No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.Website: Rev. 0.947/12FP7103Detailed DescriptionVoltage ReferenceA built-in 2.5V reference regulator supplies FP7103 internal circuits. Also, thi
23、s 2.5V reference voltage is divided down by an internal resistive divider to provide a 0.25V precision reference voltage to the error amplifier non-inverting terminal.Setting the LED CurrentFP7103 is a constant current buck regulator. The LEDs are connected between VOUT and FB pin as shown in the Ty
24、pical Application Circuit section. The FB pin is 0.25V in regulation. Therefore, the LEDs current IF is set by VFB and the resistor R2 connected between FB and ground by the following equation:I = VFB F R2IF should not exceed the 3A current capability of FP7103 and therefore R2 minimum must be appro
25、ximately 0.083Output VoltageThe output voltage is primarily determined by the number of LEDs(n) connected between VOUT and FB pin. Therefore, VOUT can be written as:VOUT = (n VF ) + VFB )Where VF is the forward voltage of one LED at the set LED current level (see LED manufacturer datasheet for forwa
26、rd characteristics curve)OscillatorThe fixed PWM frequency is generated by an internal oscillator. Its typical values are 320KHz.Thermal ProtectionThe thermal protection is triggered when junction temperature is higher than 150 that may occurs by an abnormal heavy current loading. When this happens,
27、 the FP7103 turns output off. Once the junction temperature is cooled down to lower than 130, FP7103 starts again and turns the power switch on.This datasheet contains new product information.Feeling Technology reserves the rights to modify the product specification without notice.No liability is as
28、sumed as a result of the use of this product. No rights under any patent accompany the sales of the product.Website: Rev. 0.948/12FP7103Over Current ProtectionThe FP7103 uses cycle-by-cycle current limit to protect the internal power switch. During each switching cycle, a current limit comparator de
29、tects if the power switch current exceeds the internal setting current. If it does, over current protection function decrease the oscillator frequency to prevent thermal issue.This datasheet contains new product information.Feeling Technology reserves the rights to modify the product specification w
30、ithout notice.No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.Website: Rev. 0.949/12FP7103Application InformationTypical Application CircuitIC11FBGND8VIN2ENGND7C2R13FP71036COMPLX00.1FL1 10H45VINVCCLXC7LEDC4100FC6C1D10.1F0.
31、1F100FSK34R20.25FP7103 3W / 5W LED for DC Input CircuitDimming Control CircuitChanging the duty cycle of PWM signal can get different LED current. The PWM signal is recommended above 10kHz. The application circuit is shown in the following.Dimming ControlR4 2KR3IC137K1 FBGND 8R5C51K2.2FVIN2ENGND70V5
32、VC2R1FP7103PWM36COMPLX00.1FL1 10H45VINVCCLXC7LEDC4100FC6C1D10.1F0.1F100FSK34R20.25The LED current can be calculated by the following equation:V- R4 (VPWM Duty - VFB )ILED =FBR3 + R5R2This datasheet contains new product information.Feeling Technology reserves the rights to modify the product specification without notice.No liabilit