L6668 SMART PRIMARY CONTROLLER 1 General Features Figure 1. Package MULTIPOWER BCD TECHNOLOGY LOAD-DEPENDENT CURRENT-MODE CON- TROL: FIXED-FREQUENCY (HEAVY LOAD), FREQUENCY FOLDBACK (LIGHT LOAD), BURST-MODE (NO-LOAD) SO-16 (Narrow) ON-BOARD HIGH-VOLTAGE START-UP IMPROVED STANDBY FUNCTION Table 1. Order Codes LOW QUIESCENT CURRENT (< 2 mA) SLOPE COMPENSATION Part Number Package PULSE-BY-PULSE & HICCUP-MODE OCP L6668 SO-16 INTERFACE WITH PFC CONTROLLER L6668TR SO-16 in Tape & Reel DISABLE FUNCTION (ON/OFF CONTROL) LATCHED DISABLE FOR OVP/OTP FUNC- SO16 PACKAGE ECOPACK TION PROGRAMMABLE SOFT-START 2% PRECISION REFERENCE VOLTAGE EX- 1.1 APPLICATIONS TERNALLY AVAILABLE HI-END AC-DC ADAPTERS/CHARGERS FOR 800 mA TOTEM POLE GATE DRIVER WITH NOTEBOOKS. INTERNAL CLAMP AND UVLO PULL-DOWN LCD/CRT MONITORS, LCD/CRT TV BLUE ANGEL, ENERGY STAR, EU CODE OF DIGITAL CONSUMER CONDUCT COMPLIANT Figure 2. Block Diagram S-S-CCOOMMPP VV HVHV CCCC 1515 11 55 SLSLOOPPEE COCOMMPP.. VRVREGEG 25V25V VrVrefef 1616 HHVV gen genereratatoror OONN//OOFFFF CLCLKK 88 RCRCTT TITIMIMINNGG and Uand UVVLOLO mmaannagemagementent VRVREFEF VVcc cc OOKK RR ++ DIDISS 77 SQSQ -- DIDISS 2.2.2V2V 1515VV 44 N.N.C.C. OUOUTT 66 SQSQ BBLLANANKIKINNGG RR ++ PWPWMM HIHICCCCUPUP -- RR 1212 VcVccc OOKK OCOCPP VRVREGEG 33 DIDISS ISISENEN ++ SQSQ GNGNDD HYHYSSTT.. CTR CTRLL -- -- 1.1.55VV ++ 0.0.44mmAA -- 1313 PFPFCC STSTOOPP STST--BBYY ++ 1414 STSTAANNDDBBYY 2.2.2/2/2.2.77VV 11R11R DISDIS OCOCPP SOFSOFTT--SSTTAARRTT 0.0.8V8V 4R4R 99 1111 1100 SKISKIPPAADDJJ SSSS COCOMPMP Rev. 4 January 2006 1/23L6668 2 Description L6668 is a current-mode primary controller IC, designed to build single-ended converters. The IC drives the system at fixed frequency at heavy load and an improved Standby function causes a smooth frequency reduction as the load is progressively reduced. At very light load the device enters a special operating mode (burst-mode with fixed, externally programmed peak current) that, in addition to the on-board high-voltage start-up and the very low quiescent current, helps keep low the consumption from the mains and be compliant with energy saving regulations. To allow meeting compliance with these standards in power-factor-corrected systems too, an interface with the PFC controller is provided that en- ables to turn off the pre-regulator when the load level falls below a threshold. The IC includes also a programmable soft-start, slope compensation for stable operation at duty cycles greater then 50%, a disable function, a leading edge blanking on current sense to improve noise immunity, latched disable for OVP or OTP shutdown and an effective two-level OCP able to protect the system even in case the secondary diode fails short. 1 Table 2. Absolute Maximum Ratings Symbol Pin Parameter Value Unit V 5 IC Supply voltage (Icc = 20 mA) Self-limited V cc V 1 High-voltage start-up generator voltage range -0.3 to 700 V HV I 1 High-voltage start-up generator current Self-limited A HV --- Analog Inputs & Outputs, except pin 14 -0.3 to 8 V I 14 Max. sink current (low state) 2 mA PFC STOP V 14 Max. voltage (open state) 16 V PFC STOP P Power Dissipation Tamb = 50C 0.75 W tot T Junction Temperature Operating range -25 to 150 C j T Storage Temperature -55 to 150 C stg Note: 1. ESD immunity for pin 1 is guaranteed up to 900V (Human Body Model). Table 3. Thermal Data Symbol Parameter Value Unit R Thermal Resistance Junction to AmbientMax 120 C/W th j-amb Figure 3. Pin Connection (Top view) HVHV RCRCTT HVHVSS S-S-CCOOMPMP GNGNDD PFPFCC STSTOOPP OUOUTT STSTBYBY VcVccc IISENSEN N.C.N.C. SSSS DISDIS COCOMMPP VRVREFEF SKSKIIPPADADJJ 2/23