UCC28703DBVR

Sample & Buy Product Folder Support & Community Tools & Software Technical Documents Reference Design UCC28700, UCC28701, UCC28702, UCC28703 SLUSB41A – JULY 2012 – REVISED DECEMBER 2014 UCC2870x Constant-Voltage, Constant-Current Controller With Primary-Side Regulation 1 Features 3 Description • • The UCC28700 family of flyback power supply controllers provides Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current. Low start-up current, dynamically controlled operating states and a tailored modulation profile support very low standby power without sacrificing start-up time or output transient response. 1 • • • • • • • • • • < 30-mW No-Load Power for 5-Star Rating Primary-Side Regulation (PSR) Eliminates OptoCoupler ±5% Voltage and Current Regulation 130-kHz Maximum Switching Frequency Enables High-Power Density Charger Designs Quasi-Resonant Valley-Switching Operation for Highest Overall Efficiency Patent-Pending Frequency-Jitter Scheme to Ease EMI Compliance Wide VDD Range Allows Small Bias Capacitor Clamped Gate-Drive Output for MOSFET Protection Functions: Overvoltage, Low-Line, and Overcurrent Programmable Cable Compensation (UCC28700 Only) NTC Resistor Interface (UCC28701, UCC28702 and UCC28703 Only) With Fixed Cable Compensation Options SOT-23 Package Control algorithms in the UCC28700 family allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a MOSFET power switch. Discontinuous Conduction Mode (DCM) with valley switching reduces switching losses. Modulation of switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges. The controllers have a maximum switching frequency of 130 kHz and always maintain control of the peakprimary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28700 allows the level of cable compensation to be programmed. The UCC28701, UCC28702, and UCC28703 devices allow remote temperature sensing using a Negative Temperature Coefficient (NTC) resistor while providing fixed cable-compensation levels. 2 Applications • • USB-Compliant Adapters and Chargers for Consumer Electronics (Cell Phones, Tablets and Cameras) AC and DC Power Supplies Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) UCC28700 UCC28701 SOT-23 (6) UCC28702 2.90 mm × 1.60 mm UCC28703 (1) For all available packages, see the orderable addendum at the end of the datasheet. Typical Application Schematic + VF - VBLK CB2 + CB1 NP NS COUT RPL VOUT – VAC RSTR UCC28700 SOT23-6 + VFA - VAUX VDD CDD NA RS1 DRV VS RLC CS RS2 CBC RCS RCBC GND 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. UCC28700, UCC28701, UCC28702, UCC28703 SLUSB41A – JULY 2012 – REVISED DECEMBER 2014 www.ti.com Table of Contents 1 2 3 4 5 6 7 8 Features .................................................................. Applications ........................................................... Description ............................................................. Revision History..................................................... Device Comparison Table..................................... Pin Configuration and Functions ......................... Specifications......................................................... 1 1 1 2 3 3 4 7.1 7.2 7.3 7.4 7.5 7.6 7.7 4 4 4 5 5 6 7 Absolute Maximum Ratings ..................................... ESD Ratings ............................................................ Recommended Operating Conditions....................... Thermal Information .................................................. Electrical Characteristics........................................... Switching Characteristics .......................................... Typical Characteristics .............................................. Detailed Description .............................................. 9 8.1 Overview ................................................................... 9 8.2 Functional Block Diagram ......................................... 9 8.3 Feature Description................................................. 10 8.4 Device Functional Modes........................................ 12 9 Applications and Implementation ...................... 17 9.1 Application Information............................................ 17 9.2 Typical Application .................................................. 17 10 Power Supply Recommendations ..................... 24 11 Layout................................................................... 24 11.1 Layout Guidelines ................................................. 24 11.2 Layout Example .................................................... 25 12 Device and Documentation Support ................. 25 12.1 12.2 12.3 12.4 12.5 Device Support...................................................... Documentation Support ........................................ Trademarks ........................................................... Electrostatic Discharge Caution ............................ Glossary ................................................................ 25 27 28 28 28 13 Mechanical, Packaging, and Orderable Information ........................................................... 28 4 Revision History Changes from Original (July 2012) to Revision A • 2 Page Added Handling Rating table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section ............................................................... 1 Submit Documentation Feedback Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: UCC28700 UCC28701 UCC28702 UCC28703 UCC28700, UCC28701, UCC28702, UCC28703 www.ti.com SLUSB41A – JULY 2012 – REVISED DECEMBER 2014 5 Device Comparison Table (1) (2) PART NUMBER (1) (2) VERSION UCC28700 Programmable cable compensation UCC28701 NTC, 0 mV (at 5-V output) cable compensation option UCC28702 NTC, 150 mV (at 5-V output) cable compensation option UCC28703 NTC, 300 mV (at 5-V output) cable compensation option See Addendum for specific device ordering information. For other fixed cable compensation options, please consult the factory. 6 Pin Configuration and Functions UCC28700/1/2/3 SOT-6 (DBV) CBC (00) 1 NTC (1/2/3) 6 VS VDD 2 5 GND DRV 3 4 CS (TOP VIEW) Pin Functions PIN NAME CBC UCC28700 UCC28701/2/3 NO. NO. 1 — I/O DESCRIPTION I Cable Compensation (CBC) is a programming pin for compensation of cable voltage drop. Cable compensation is programmed with a resistor to GND. CS 4 4 I Current Sense (CS) input connects to a ground-referenced current-sense resistor in series with the power switch. The resulting voltage is used to monitor and control the peak primary current. A series resistor can be added to this pin to compensate the peak switch current levels as the ACmains input varies. DRV 3 3 O Drive (DRV) is an output used to drive the gate of an external high voltage MOSFET switching transistor. GND 5 5 — The Ground (GND) pin is both the reference pin for the controller and the low-side return for the drive output. Special care should be taken to return all AC decoupling capacitors as close as possible to this pin and avoid any common trace length with analog signal return paths. NTC — 1 I NTC is an interface to an external NTC (negative temperature coefficient) resistor for remote temperature sensing. Pulling this pin low shuts down PWM action. VDD 2 2 — VDD is the bias supply input pin to the controller. A carefully-placed bypass capacitor to GND is required on this pin. I Voltage Sense (VS) is an input used to provide voltage and timing feedback to the controller. This pin is connected to a voltage divider between an auxiliary winding and GND. The value of the upper resistor of this divider is used to program the AC-mains run and stop thresholds and line compensation at the CS pin. VS 6 6 Copyright © 2012–2014, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: UCC28700 UCC28701 UCC28702 UCC28703 3 UCC28700, UCC28701, UCC28702, UCC28703 SLUSB41A – JULY 2012 – REVISED DECEMBER 2014 www.ti.com 7 Specifications Absolute Maximum Ratings (1) 7.1 over operating free-air temperature range (unless otherwise noted) MIN MAX UNIT 38 V Bias supply voltage VVDD Continuous gate current sink IDRV 50 Continuous gate current source IDRV Selflimiting Peak VS pin current IVS Gate-drive voltage at DRV −1.2 VDRV −0.5 Selflimiting VS −0.75 7 Voltage range CS, CBC (UCC28700), NTC (UCC28701/2/3) −0.5 5 Operating junction temperature range TJ −55 150 Lead temperature 0.6 mm from case for 10 seconds V °C 260 Storage temperature, Tstg (1) mA –65 150 °C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltages are with respect to GND. Currents are positive into, negative out of the specified terminal. These ratings apply over the operating ambient temperature ranges unless otherwise noted. 7.2 ESD Ratings VALUE V(ESD) (1) (2) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1) ±2000 Charged-device model (CDM), per JEDEC specification JESD22C101 (2) ±500 UNIT V JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process. 7.3 Recommended Operating Conditions over operating free-air temperature range (unless otherwise noted) MIN MAX 9 35 0.047 1 UNIT VDD Bias supply operating voltage CVDD VDD bypass capacitor RCBC Cable-compensation resistance 10 kΩ IVS VS pin current −1 mA TJ Operating junction temperature 4 Submit Documentation Feedback −20 125 V µF °C Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: UCC28700 UCC28701 UCC28702 UCC28703 UCC28700, UCC28701, UCC28702, UCC28703 www.ti.com SLUSB41A – JULY 2012 – REVISED DECEMBER 2014 7.4 Thermal Information UCC2870x THERMAL METRIC (1) DBV UNIT 6 PINS Junction-to-ambient thermal resistance (2) θJA 180 (3) θJCtop Junction-to-case (top) thermal resistance θJB Junction-to-board thermal resistance (4) 44.4 ψJT Junction-to-top characterization parameter (5) 5.1 ψJB Junction-to-board characterization parameter (6) 43.8 (1) (2) (3) (4) (5) (6) 71.2 °C/W For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953. The junction-to-ambient thermal resistance under natural convection is obtained in a simulation on a JEDEC-standard, high-K board, as specified in JESD51-7, in an environment described in JESD51-2a. The junction-to-case (top) thermal resistance is obtained by simulating a cold plate test on the package top. No specific JEDECstandard test exists, but a close description can be found in the ANSI SEMI standard G30-88. The junction-to-board thermal resistance is obtained by simulating in an environment with a ring cold plate fixture to control the PCB temperature, as described in JESD51-8. The junction-to-top characterization parameter, ψJT, estimates the junction temperature of a device in a real system and is extracted from the simulation data for obtaining RθJA, using a procedure described in JESD51-2a (sections 6 and 7). The junction-to-board characterization parameter, ψJB, estimates the junction temperature of a device in a real system and is extracted from the simulation data for obtaining RθJA, using a procedure described in JESD51-2a (sections 6 and 7). 7.5 Electrical Characteristics over operating free-air temperature range, VDD = 25 V, RCBC = RNTC = open, –20°C ≤ TA ≤ 125°C, TJ = TA (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS mA BIAS SUPPLY INPUT IRUN Supply current, run IDRV = 0, run state 2.1 2.65 IWAIT Supply current, wait IDRV = 0, wait state 85 110 ISTART Supply current, start IDRV = 0, VVDD = 18 V, start state 1 1.5 IFAULT Supply current, fault IDRV = 0, fault state 2.1 2.8 µA mA UNDER-VOLTAGE LOCKOUT VVDD(on) VDD turn-on threshold VVDD low to high 19 21 23 VVDD(off) VDD turn-off threshold VVDD high to low 7.7 8.1 8.45 VVSR Regulating level Measured at no-load condition, TJ = 25°C 4.01 4.05 4.09 V VVSNC Negative clamp level IVS = -300 µA, volts below ground 190 250 325 mV IVSB Input bias current VVS = 4 V –0.25 0 0.25 µA V VS INPUT CS INPUT VCST(max) Max CS threshold voltage VVS = 3.7 V (1) 715 750 775 VCST(min) Min CS threshold voltage VVS = 4.35 V (1) 230 250 270 KAM AM control ratio VCST(max) / VCST(min) 2.75 3.0 3.15 V/V VCCR constant-current regulating level CC regulation constant 310 319 329 mV KLC Line compensating current ratio IVSLS = -300 µA, IVSLS / current out of CS pin 23 25 28 A/A TCSLEB Leading-edge blanking time DRV output duration, VCS = 1 V 195 235 275 ns IDRS DRV source current VDRV = 8 V, VVDD = 9 V 20 25 RDRVLS DRV low-side drive resistance IDRV = 10 mA VDRCL DRV clamp voltage RDRVSS DRV pull-down in start state mV DRV (1) VVDD = 35 V 150 mA Ω 6 12 14 16 V 200 230 kΩ These devices automatically vary the control frequency and current sense thresholds to improve EMI performance, these threshold voltages and frequency limits represent average levels. Copyright © 2012–2014, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: UCC28700 UCC28701 UCC28702 UCC28703 5 UCC28700, UCC28701, UCC28702, UCC28703 SLUSB41A – JULY 2012 – REVISED DECEMBER 2014 www.ti.com Electrical Characteristics (continued) over operating free-air temperature range, VDD = 25 V, RCBC = RNTC = open, –20°C ≤ TA ≤ 125°C, TJ = TA (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS PROTECTION VOVP Over-voltage threshold At VS input, TJ = 25°C 4.52 4.6 4.68 VOCP Over-current threshold At CS input 1.4 1.5 1.6 IVSL(run) VS line-sense run current Current out of VS pin – increasing 190 220 260 IVSL(stop) VS line-sense stop current Current out of VS pin – decreasing 70 80 95 KVSL VS line-sense ratio IVSL(run) / IVSL(stop) 2.5 2.8 3.05 TJ(stop) Thermal shut-down temperature Internal junction temperature 165 V µA A/A °C CABLE COMPENSATION (UCC28700 ONLY) VCBC(max) Cable compensation maximum voltage Voltage at CBC at full load 2.8 3.0 3.4 VCVS(min) Compensation at VS VCBC = open, change in VS regulating level at full load –45 –15 25 VCVS(max) Maximum compensation at VS VCBC = 0 V, change in VS regulating level at full load 275 320 365 –45 –15 25 V mV CABLE COMPENSATION (UCC28701, UCC28702, AND UCC28703 ONLY) VCVS Compensation at VS (UCC28701) Change in VS regulating level at full load VCVS Compensation at VS (UCC28702) Change in VS regulating level at full load 100 VCVS Compensation at VS (UCC28703) Change in VS regulating level at full load 200 mV NTC INPUT (UCC28701, UCC28702, AND UCC28703 ONLY) VNTCTH NTC shut-down threshold Fault UVLO cycle when below this threshold 0.95 V INTC NTC pull-up current Current out of pin 105 µA 7.6 Switching Characteristics over operating free-air temperature range (unless otherwise noted) MIN TYP MAX UNIT fSW(max) Maximum switching frequency PARAMETER VVS = 3.7 V (1) 120 130 140 kHz fSW(min) Minimum switching frequency VVS = 4.35 V (1) 875 1000 1100 Hz TZTO Zero-crossing timeout delay 1.8 2.1 2.45 µs (1) 6 TEST CONDITIONS These devices automatically vary the control frequency and current sense thresholds to improve EMI performance, these threshold voltages and frequency limits represent average levels. Submit Documentation Feedback Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: UCC28700 UCC28701 UCC28702 UCC28703 UCC28700, UCC28701, UCC28702, UCC28703 www.ti.com SLUSB41A – JULY 2012 – REVISED DECEMBER 2014 7.7 Typical Characteristics At VDD = 25 V, unless otherwise noted. 10 10 Run State IRUN, VDD = 25 V 1 IVDD − Bias Supply Current (mA) IVDD − Bias Supply Current (mA) 1 Wait State 0.1 0.01 VDD Turn−Off 0.001 VDD Turn−On IWAIT, VDD = 25 V 0.1 0.01 0.001 0.0001 ISTART, VDD = 18 V Start State 0.00001 0 5 10 15 20 25 VDD − Bias Supply Voltage (V) 30 35 0.0001 −25 0 25 50 75 TJ − Temperature (°C) 100 G001 G002 Figure 1. Bias Supply Current vs. Bias Supply Voltage Figure 2. Bias Supply Current vs. Temperature 300 4.10 250 VS Line Sense Current (µA) VVSR − VS Regulation Voltage (V) 4.08 4.06 4.04 4.02 4.00 IVSLRUN 200 150 100 IVSLSTOP 50 3.98 3.96 −25 0 25 50 75 TJ − Temperature (°C) 100 0 −20 125 5 30 55 80 TJ − Temperature (°C) 105 G003 Figure 4. Line-Sense Current vs. Temperature 330 VCCR − Constant Current Regulating Level (mV) 270 VCSTMIN − Minimum CS Threshold Voltage (mV) 125 G004 Figure 3. VS Regulation Voltage vs. Temperature 265 260 255 250 245 240 235 230 −25 125 0 25 50 75 TJ − Temperature (°C) 100 125 325 320 315 310 −25 0 25 50 75 TJ − Temperature (°C) G005 Figure 5. Minimum CS Threshold Voltage vs. Temperature Copyright © 2012–2014, Texas Instruments Incorporated 100 125 G006 Figure 6. Constant-Current Regulating Level vs. Temperature Submit Documentation Feedback Product Folder Links: UCC28700 UCC28701 UCC28702 UCC28703 7 UCC28700, UCC28701, UCC28702, UCC28703 SLUSB41A – JULY 2012 – REVISED DECEMBER 2014 www.ti.com Typical Characteristics (continued) At VDD = 25 V, unless otherwise noted. FSWMIN − Minimum Switching Frequency (Hz) 1100 1075 1050 1025 1000 975 950 925 900 875 −25 0 25 50 75 TJ − Temperature (°C) 100 125 G007 VDRV = 8 V, VVDD = 9 V Figure 7. Minimum Switching Frequency vs. Temperature Figure 8. DRV Source Current vs. Temperature 120 115 0.98 INTC −NTC Pull−up Current (µA) VNTCTH − NTC Shutdown Threshold Voltage (V) 1.00 0.96 0.94 0.92 0.90 −25 110 105 100 95 0 25 50 75 TJ − Temperature (°C) 100 90 −25 125 0 25 50 75 TJ − Temperature (°C) G009 100 125 G010 Figure 9. NTC Shutdown Threshold Voltage vs. Temperature Figure 10. NTC Pullup Current vs. Temperature 4.68 VOVP − VS Over−Voltage Threshold (V) 4.66 4.64 4.62 4.60 4.58 4.56 4.54 4.52 −25 0 25 50 75 TJ − Temperature (°C) 100 125 G011 Figure 11. Overvoltage Threshold vs. Temperature 8 Submit Documentation Feedback Copyright © 2012–2014, Texas Instruments Incorporated Product Folder Links: UCC28700 UCC28701 UCC28702 UCC28703 UCC28700, UCC28701, UCC28702, UCC28703 www.ti.com SLUSB41A – JULY 2012 – REVISED DECEMBER 2014 8 Detailed Description 8.1 Overview The UCC28700 is a flyback power supply controller which provides accurate voltage and constant current regulation with primary-side feedback, eliminating the need for opto-coupler feedback circuits. The controller operates in discontinuous conduction mode with valley-switching to minimize switching losses. The modulation scheme is a combination of frequency and primary peak current modulation to provide high conversion efficiency across the load range. The control law provides a wide-dynamic operating range of output power to achieve the