NCP4328 - Secondary Side CV/CC Controller

1 Semiconductor Components Industries, LLC, 2015 July, 2015 Rev. 21 Publication Order Number: NCP4328 /DNCP4328 Secondary side CV/CCControllerThe NCP4328 is a Secondary side SMPS Controller designed for usein applications which requires constant current and/or constant NCP4328x consists of two OTA amplifiers for voltage andcurrent loop regulation with precise internal voltage of OTAs are open drain type (OTAs sink current only).The NCP4328B includes a LED driver pin implemented with anopen drain MOSFET driven by a 1 kHz square wave with a cycle working when VCC is above UVLO for indication NCP4328A is available in TSOP 5 package while theNCP4328B is available in TSOP 6 Operating Input Voltage Range: V to V Supply current < 100 mA Reference Voltage Accuracy (TJ = 25 C) Constant Voltage and Constant Current (A versions) Control Loop Indication LED PWM Modulated Driver (NCP4328B) These Devices are Pb Free, Halogen Free/BFR Free and are RoHSCompliantTypical Applications Offline Adapters for Notebooks, Game Stations and Printers LED Lightening High Power AC DC Converters for TVs, Set Top Boxes, 5SN SUFFIXCASE 483 TSOP 6SN SUFFIXCASE 318 GSee detailed ordering, marking and shipping information onpage 8 of this data INFORMATION1515 XXXAYWGGXXX = Specific Device CodeA= Assembly LocationY= YearW= Work WeekG= Pb Free PackageMARKINGDIAGRAMS(Note: Microdot may be in either location) onlySink onlyVREFVCC managementNCP4328 ANCP4328 BFigure 1.

2 Simplified Block Diagrams NCP4328A and NCP4328 BVREFVCC managementPowerRESETV oltageRegulation1 kHz, 12% onlySink FUNCTION DESCRIPTIONNCP4328 ATSOP 5 NCP4328 BTSOP 6 Pin NameDescription11 VCCS upply voltage pin22 GNDG round56 VSNSO utput voltage sensing pin, connected to output voltage divider44 ISNSC urrent sensing input for output current regulation, connect it to shunt resistorin ground branch. 5 LEDPWM LED driver output. Connected to LED cathode with current define byexternal serial resistance33 FBCO utput of current sinking OTA amplifiers driving feedback optocoupler s here compensation networks as MAXIMUM RATINGSR atingSymbolValueUnitInput VoltageVCC to , LED VoltageVFBC, VLED to VCC + , ISNS VoltageVSNS,VISNS to CurrentILED10mAThermal Resistance Junction to Air (Note 1)RqJA315 C/WJunction TemperatureTJ 40 to 150 CStorage TemperatureTSTG 55 to 150 CESD Capability, Human Body Model (Note 2)ESDHBM2000 VESD Capability, Machine Model (Note 2)ESDMM250 VStresses exceeding those listed in the Maximum Ratings table may damage the device.

3 If any of these limits are exceeded, device functionalityshould not be assumed, damage may occur and reliability may be 50 mm2, oz. Copper This device series incorporates ESD protection and is tested by the following methods:ESD Human Body Model tested per JESD22 A114 FESD Machine Model tested per JESD22 A115 CLatchup Current Maximum Rating tested per JEDEC standard: CHARACTERISTICS 40 C TJ 125 C; VCC = 15 V; unless otherwise noted. Typical values are at TJ = +25 ConditionsSymbolMinTypMaxUnitMaximum Operating Input UVLOVCC UVLO CurrentNCP4328 AICC105130mANCP4328B115140 VOLTAGE CONTROL LOOP OTAT ransconductanceSink current onlygmV1 SReference V VCC V, TJ = 25 V VCC V, TJ = 0 85 V VCC V, TJ = 40 125 Current CapabilityVFBC > Input Bias CurrentVSNS = VREFIBIASV 100100nACURRENT CONTROL LOOP OTAT ransconductanceSink current onlygmC3 SReference VoltageTJ = 25 = 20 85 = 40 125 Current CapabilityVFBC > Input Bias CurrentISNS = VREFCIBIASC 100100nALED DRIVER (NCP4328B Only)Switching FrequencyfSWLED1kHzDuty Cycle(Note 3) ResistanceILED = 5 mARSW50 WProduct parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted.

4 Productperformance may not be indicated by the Electrical Characteristics if operated under different Guaranteed by CHARACTERISTICSF igure 2. VREF at VCC = 15 40 20020406080100120TJ ( C)VREF (V) 3. VREF at TJ = (V)VREF (V) 4. VREFC at VCC = 15 V65 40 20020406080100120TJ ( C)VREFC (mV) (mV) 5. VREFC at TJ = 255 CVCC (V)061218243036 Figure 6. 40 20020406080100120TJ ( C)VCC (V) CHARACTERISTICSICC (mA)VCC (V)061218243036 Figure 7. ICC at VCC = 15 V for NCP4328 ATJ ( C)130 ICC (mA) 40 20020406080100120120110100808070 Figure 8. ICC at TJ = 255C for NCP4328A130120110100808070TJ ( C)150 ICC (mA) 40 20020406080100120 Figure 9. ICC at VCC = 15 V for NCP4328B14013012011010090 VCC (V)061218243036150 ICC (mA)14013012011010090 Figure 10. ICC at TJ = 255C for NCP4328 BTJ ( C) (mA) 40 11. Voltage OTA Current Sink CapabilityTJ ( C) (mA) 40 12. Current OTA Current Sink CHARACTERISTICSTJ ( C) (kHz) 40 20020406080100120 Figure 13.

5 LED Switching Frequency atVCC = 15 VTJ ( C)100 RSW2 (W) 40 14. RSW at VCC = 15 VAPPLICATION INFORMATIONT ypical application circuit for NCP4328A is shown inFigures 15 and 16 shows typical application circuit forNCP4328B that includes internal LED driver for SupplyThe NCP4328 is designed to operate from a single supplyup to 36 V. It starts to operate when VCC voltage V and stops when VCC voltage drops below V. VCCcan be supplied by direct connection to the VOUT voltageof the power supply. It is highly recommended to add a RCfilter (R1 and C2) in series from VOUT to VCC pin to reducevoltage spikes and drops that are produced at the converter soutput capacitors. Recommended values for this filter are220 W and 1 Regulation PathThe output voltage is detected on the VSNS pin by the R3and R4 voltage divider. This voltage is compared with theinternal precise voltage reference.

6 The voltage difference isamplified by gmV of the transconductance amplifier. Theamplifier output current is connected to the FBC pin. Thecompensation network is also connected to this pin toprovide frequency compensation for the voltage regulationpath. This FBC pin drives regulation optocoupler thatprovides regulation of primary side . The optocoupler issupplied via direct connection to VOUT line throughresistor information is transferred through theoptocoupler to the primary side Controller where its FB pinis usually pulled down to reduce energy transferred tosecondary output voltage can be computed by Equation +VREFR3)R4R4(eq. 1)Current RegulationThe output current is sensed by the shunt resistor R5 inseries with the load. Voltage drop on R5 is compared withinternal precise voltage reference VREFC at ISNS transconductance amplifier difference is amplified by gmC to output currentof amplifier, connected to FBC pin.

7 Compensation networkis connected between this pin and ISNS input to providefrequency compensation for current regulation R6 separates compensation network from senseresistor. Compensation network works into low impedancewithout this resistor that significantly decreasescompensation network regulation point is set to current given byEquation +VREFCR5(eq. 2)LED Driver (NCP4328B only)LED driver is active when VCC is higher than driver consists of an internal power switch controlledby a PWM modulated logic signal and an external currentlimiting resistor R9. LED current can be computed byEquation 3 ILED+VOUT*VF_LEDR9(eq. 3)PWM modulation is used to increase efficiency of 15. Typical Application Schematic for NCP4328 AFeedbackoptoD1C1 VOUTR3R2R4C3R7R5C4R8R6R1C2 VoltageRegulationVREFCC urrentRegulationOTAOTAVCCISNSVSNSGNDFBCS ink onlySink onlyVREFVCC managementFigure 16.

8 Typical Application Schematic for NCP4328 BFeedbackoptoD1C1 VOUTR3R2R4C3R7R5C4R8 IndicationLEDR9R6R1C2 VREFVCC managementPowerRESETV oltageRegulation1 kHz, 12% INFORMATIOND eviceMarkingLED DriverPackageShipping NCP4328 ASNT1GA32 NoTSOP 5(Pb Free)3000 / Tape & ReelNCP4328 BSNT1GU32Ye sTSOP 6(Pb Free)3000 / Tape & Reel For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel PackagingSpecifications Brochure, BRD8011 DIMENSIONSTSOP 5 CASE 483 02 ISSUE KNOTES:1. DIMENSIONING AND TOLERANCING PER , CONTROLLING DIMENSION: MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISHTHICKNESS. MINIMUM LEAD THICKNESS IS THEMINIMUM THICKNESS OF BASE DIMENSIONS A AND B DO NOT INCLUDE MOLDFLASH, PROTRUSIONS, OR GATE BURRS. MOLDFLASH, PROTRUSIONS, OR GATE BURRS SHALL NOTEXCEED PER side . DIMENSION OPTIONAL CONSTRUCTION: AN ADDITIONALTRIMMED LEAD IS ALLOWED IN THIS LEAD NOT TO EXTEND MORE THAN 10 mminches SCALE 10 *For additional information on our Pb Free strategy and solderingdetails, please download the ON Semiconductor Soldering andMounting Techniques Reference Manual, FOOTPRINT* ZDETAIL ZTOP VIEWSIDE VIEWABEND DIMENSIONS TSOP 6 CASE 318G 02 ISSUE :1.

9 DIMENSIONING AND TOLERANCING PER ASME , CONTROLLING DIMENSION: MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH. MINIMUMLEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE DIMENSIONS D AND E1 DO NOT INCLUDE MOLD FLASH,PROTRUSIONS, OR GATE BURRS. MOLD FLASH, PROTRUSIONS, ORGATE BURRS SHALL NOT EXCEED PER side . DIMENSIONS DAND E1 ARE DETERMINED AT DATUM PIN ONE INDICATOR MUST BE LOCATED IN THE INDICATED *For additional information on our Pb Free strategy and solderingdetails, please download the ON Semiconductor Soldering andMounting Techniques Reference Manual, FOOTPRINT* BSCL2 0 10 5 LCMHL2 SEATINGPLANEGAUGEPLANEDETAIL ZDETAIL : MILLIMETERSMON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks,copyrights, trade secrets, and other intellectual property.

10 A listing of SCILLC s product/patent coverage may be accessed at SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for anyparticular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including withoutlimitation special, consequential or incidental damages. Typical parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applicationsand actual performance may vary over time. All operating parameters, including Typicals must be validated for each customer application by customer s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.