Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - AC/DC converter, offline switcher Flyback SOIC 7

VDD

UCC28710

CBC

GND

DRV

–

OUT

AUX

UDG-12200

UCC28710, UCC28711

UCC28712, UCC28713

UCC28714, UCC28715

www.ti.com

SLUSB86 –NOVEMBER 2012

Constant-Voltage, Constant-Current Controller With Primary-Side Regulation

Check for Samples: UCC28710, UCC28711, UCC28712, UCC28713, UCC28714, UCC28715

FEATURES

APPLICATIONS

• < 10-mW No-Load Power • USB-Compliant Adapters and Chargers for

Consumer Electronics

• Primary-Side Regulation (PSR) Eliminates

Opto-Coupler – Smart phones

• ±5% Voltage and Current Regulation Across – Tablet computers

Line and Load

– Cameras

• 700-V Start-Up Switch

• Standby Supply for TV and Desktop

• 100-kHz Maximum Switching Frequency

• White Goods

Enables High-Power Density Charger Designs

• Quasi-Resonant Valley-Switching Operation DESCRIPTION

for Highest Overall Efficiency

The UCC28710 family of flyback power supply

controllers provides isolated-output Constant-Voltage

• Frequency Jitter to Ease EMI Compliance

(CV) and Constant-Current (CC) output regulation

• Wide VDD Range Allows Small Bias Capacitor

without the use of an optical coupler. The devices

• Clamped Gate-Drive Output for MOSFET

process information from the primary power switch

and an auxiliary flyback winding for precise control of

• Overvoltage, Low-Line, and Overcurrent

output voltage and current.

Protection Functions

• Programmable Cable Compensation

An internal 700-V start-up switch, dynamically-

controlled operating states and a tailored modulation

(UCC28710, UCC28714 and UCC28715)

profile support ultra-low standby power without

• NTC Resistor Interface (UCC28711, UCC28712

sacrificing start-up time or output transient response.

and UCC28713) with Fixed Cable

Compensation Options Control algorithms in the UCC28710 family allow

operating efficiencies to meet or exceed applicable

• SOIC-7 Package

standards. The output drive interfaces to a MOSFET

power switch. Discontinuous conduction mode (DCM)

SIMPLIFIED APPLICATION

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 100 kHz and always maintain control of the peak-

primary current in the transformer. Protection features

help keep primary and secondary component

stresses in check. The UCC28710, UCC28714 and

UCC28715 allow the cable compensation to be

programmed. The UCC28711, UCC28712 and

UCC28713 devices allow remote temperature

sensing using a negative temperature coefficient

(NTC) resistor while providing fixed cable-

compensation levels.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (31 pages)

PAGE 1
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 www.ti.
PAGE 2
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 SLUSB86 – NOVEMBER 2012 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
PAGE 3
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 www.ti.com SLUSB86 – NOVEMBER 2012 RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless otherwise noted) MIN TYP MAX UNIT VDD Bias supply operating voltage CVDD VDD bypass capacitor 9 35 V 0.
PAGE 4
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 SLUSB86 – NOVEMBER 2012 www.ti.com ELECTRICAL CHARACTERISTICS over operating free-air temperature range, VVDD = 25 V, HV = open, RCBC(NTC) = open, TA = -40°C to 125°C, TA = TJ (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS HIGH-VOLTAGE START UP IHV Start-up current out of VDD VHV = 100 V, VVDD = 0 V, start state IHVLKG Leakage current at HV VHV = 400 V, run state 100 250 500 0.1 1 2.00 2.
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UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 www.ti.com SLUSB86 – NOVEMBER 2012 ELECTRICAL CHARACTERISTICS (continued) over operating free-air temperature range, VVDD = 25 V, HV = open, RCBC(NTC) = open, TA = -40°C to 125°C, TA = TJ (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS PROTECTION VOVP Over-voltage threshold At VS input, TJ = 25°C (2) 4.55 4.60 4.71 VOCP Over-current threshold At CS input 1.4 1.5 1.
PAGE 6
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 SLUSB86 – NOVEMBER 2012 www.ti.com DEVICE INFORMATION Functional Block Diagram IHV HV OC FAULT OV FAULT TSD/SD FAULT LINE FAULT POWER & FAULT MANAGEMENT UVLO 21 V / 8 V VDD VDD 5V GND 4.
PAGE 7
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 www.ti.com SLUSB86 – NOVEMBER 2012 SOIC (D) PACKAGE 7 PINS (TOP VIEW) UCC28711 UCC28712 UCC28713 UCC28710 UCC28714 UCC28715 VDD 1 VS 2 CBC 3 6 GND 4 5 7 7 HV 3 6 DRV 4 5 CS VDD 1 VS 2 DRV NTC CS GND HV PIN FUNCTIONS NAME UCC28710 UCC28714 UCC28715 UCC28711 UCC28712 UCC28713 I/O CBC 3 — I Cable compensation is a programming pin for compensation of cable voltage drop.
PAGE 8
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 SLUSB86 – NOVEMBER 2012 www.ti.com Detailed Pin Description VDD (Device Bias Voltage Supply): The VDD pin is connected to a bypass capacitor to ground. The VDD turnon UVLO threshold is 21 V and turn-off UVLO threshold is 8.1 V, with an available operating range up to 35 V on VDD.
PAGE 9
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 www.ti.com SLUSB86 – NOVEMBER 2012 CS (Current Sense): The current-sense pin is connected through a series resistor (RLC) to the current-sense resistor (RCS). The current-sense threshold is 0.78 V for IPP(max) and 0.195 V for IPP(min). The series resistor RLC provides the function of feed-forward line compensation to eliminate change in IPP due to change in di/dt and the propagation delay of the internal comparator and MOSFET turn-off time.
PAGE 10
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 SLUSB86 – NOVEMBER 2012 www.ti.com TYPICAL CHARACTERISTICS VDD = 25 V, unless otherwise noted. 10 10 IRUN, VDD = 25V Run State 1 IVDD - Bias Supply Current (mA) IVDD - Bias Supply Current (mA) 1 Wait State 0.1 /\ \/ VDD Turn-Off VDD Turn-On 0.01 Start State IWAIT, VDD = 25V 0.1 ISTART, VDD = 18V 0.01 0.001 0.001 0.0001 0.
PAGE 11
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 www.ti.com SLUSB86 – NOVEMBER 2012 TYPICAL CHARACTERISTICS (continued) 210 350 205 345 VCCR - Constant Current Regulating Level (mV) VCST(min) - Minimum CS Threshold Voltage (mV) VDD = 25 V, unless otherwise noted. 200 195 190 185 180 175 170 340 335 330 325 320 315 310 -50 -25 0 25 50 75 100 125 -50 -25 0 TJ - Temperature (oC) 25 50 75 100 125 TJ - Temperature (oC) C005 C006 Figure 5. Minimum CS Threshold vs.
PAGE 12
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 SLUSB86 – NOVEMBER 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) VDD = 25 V, unless otherwise noted. 120 115 0.98 INTC - NTC Pull-Up Current ( A) VNTCTH - NTC Shutdown Threshold Voltage (V) 1.00 0.96 0.94 0.92 110 105 100 95 0.90 90 -50 -25 0 25 50 75 100 125 -50 -25 0 TJ - Temperature (oC) 25 50 75 100 C009 C010 Figure 10. NTC Pull-Up Current vs. Temperature 4.68 320 4.66 280 4.
PAGE 13
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 www.ti.com SLUSB86 – NOVEMBER 2012 FUNCTIONAL DESCRIPTION The UCC28710 family 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.
PAGE 14
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 SLUSB86 – NOVEMBER 2012 www.ti.com In primary-side control, the output voltage is sensed on the auxiliary winding during the transfer of transformer energy to the secondary. As shown in Figure 14 it is clear there is a down slope representing a decreasing total rectifier VF and resistance voltage drop (ISRS) as the secondary current decreases to zero.
PAGE 15
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 www.ti.com SLUSB86 – NOVEMBER 2012 During voltage regulation, the controller operates in frequency modulation mode and amplitude modulation mode as illustrated in Figure 16 below. The internal operating frequency limits of the device are 100 kHz maximum and fSW(min). The transformer primary inductance and primary peak current chosen sets the maximum operating frequency of the converter.
PAGE 16
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 SLUSB86 – NOVEMBER 2012 www.ti.com Primary-Side Current Regulation Timing information at the VS pin and current information at the CS pin allow accurate regulation of the secondary average current. The control law dictates that as power is increased in CV regulation and approaching CC regulation the primary-peak current is at IPP(max).
PAGE 17
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 www.ti.com SLUSB86 – NOVEMBER 2012 Valley Switching The UCC28710 family utilizes valley switching to reduce switching losses in the MOSFET, to reduce inducedEMI, and to minimize the turn-on current spike at the sense resistor. The controller operates in valley-switching in all load conditions unless the VDS ringing has diminished.
PAGE 18
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 SLUSB86 – NOVEMBER 2012 www.ti.com Fault Protection There is comprehensive fault protection. Protection functions include: • Output over-voltage fault • Input under-voltage fault • Internal over-temperature fault • Primary over-current fault • CS pin fault • VS pin fault A UVLO reset and restart sequence applies for all fault protection events. The output over-voltage function is determined by the voltage feedback on the VS pin.
PAGE 19
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 www.ti.com SLUSB86 – NOVEMBER 2012 DESIGN PROCEDURE This procedure outlines the steps to design a constant-voltage, constant-current flyback converter using the UCC28710 family of controllers. Refer to the Figure 20 for component names and network locations. The design procedure equations use terms that are defined below.
PAGE 20
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 SLUSB86 – NOVEMBER 2012 www.ti.com Current and Voltage Scaling Terms • KAM: maximum-to-minimum peak primary current ratio (see ELECTRICAL CHARACTERISTICS). • KLC: current-scaling constant (see ELECTRICAL CHARACTERISTICS). Transformer Terms • LP: transformer primary inductance. • NAS: transformer auxiliary-to-secondary turns ratio. • NPA: transformer primary-to-auxiliary turns ratio. • NPS: transformer primary-to-secondary turns ratio.
PAGE 21
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 www.ti.com SLUSB86 – NOVEMBER 2012 Voltage Terms in Volts • VBLK: highest bulk capacitor voltage for stand-by power measurement. • VBULK(min): minimum voltage on CB1 and CB2 at full power. • VOCBC: target cable compensation voltage at the output terminals. • VCBC(max): maximum voltage at the CBC pin at the maximum converter output current (see ELECTRICAL CHARACTERISTICS). • VCCR: constant-current regulating voltage (see ELECTRICAL CHARACTERISTICS).
PAGE 22
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 SLUSB86 – NOVEMBER 2012 www.ti.com Stand-by Power Estimate Assuming no-load stand-by power is a critical design parameter, determine estimated no-load power based on target converter maximum switching frequency and output power rating. The following equation estimates the stand-by power of the converter. (7) For a typical USB charger application, the bias power during no-load is approximately 2.5 mW.
PAGE 23
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 www.ti.com SLUSB86 – NOVEMBER 2012 Transformer Turns Ratio, Inductance, Primary-Peak Current The maximum primary-to-secondary turns ratio can be determined by the target maximum switching frequency at full load, the minimum input capacitor bulk voltage, and the estimated DCM quasi-resonant time.
PAGE 24
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 SLUSB86 – NOVEMBER 2012 www.ti.com Transformer Parameter Verification The transformer turns ratio selected affects the MOSFET VDS and secondary rectifier reverse voltage so these should be reviewed. The UCC28710 family does require a minimum on time of the MOSFET (tON) and minimum DMAG time (tDMAG) of the secondary rectifier in the high line, minimum load condition. The selection of fMAX, LP and RCS affects the minimum tON and tDMAG.
PAGE 25
UCC28710, UCC28711 UCC28712, UCC28713 UCC28714, UCC28715 www.ti.com SLUSB86 – NOVEMBER 2012 VDD Capacitance, CDD The capacitance on VDD needs to supply the device operating current until the output of the converter reaches the target minimum operating voltage in constant-current regulation. At this time the auxiliary winding can sustain the voltage to the UCC28710 family. The total output current available to the load and to charge the output capacitors is the constant-current regulation target.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 22-Dec-2013 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Dec-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant UCC28710DR SOIC D 7 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 UCC28711DR SOIC D 7 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 UCC28713DR SOIC D 7 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Dec-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) UCC28710DR SOIC D 7 2500 367.0 367.0 35.0 UCC28711DR SOIC D 7 2500 367.0 367.0 35.0 UCC28713DR SOIC D 7 2500 367.0 367.0 35.
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