LV5028TT

Ordering number : ENA1999 LV5028TT Overview Bi-CMOS IC LED Driver IC LV5028TT is a High voltage LED drive controller which drives LED current up to 3A with external MOSFET. LV5028TT is realized very simple LED circuits with a few external parts. It corresponds to various wide dimming controls including the TRIAC dimming control. Note) This LV5028TT is designed or developed for general use or consumer appliance. Therefore, it is NOT permitted to use for automotive, communication, office equipment, industrial equipment. Functions • High voltage LED controller • Switching frequency: 50kHz • Soft Start function • Built-in TRIAC stabilized function • Built-in circuit of detection of overvoltage of CS pin. • Corresponds to TRIAC stabilized • Selectable reference Voltage -Internal 0.605V & External Input Voltage • Low noise switching system/skip frequency function - 5 stages skip mode Frequency - Soft driving Specifications Maximum Ratings at Ta = 25°C Parameter Maximum input voltage REF_OUT, REF_IN, CS, PWM_D, ACS OUT1 pin OUT2 pin Allowable power dissipation VOUT_abs VOUT2_abs Pd max With specified board* -0.3 to 42 -0.3 to 42 1.0 V V W Symbol VIN max (Note1) Conditions Ratings -0.3 to 42 -0.3 to 7 Unit V V Continued on next page. Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment. The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for new introduction or other application different from current conditions on the usage of automotive device, communication device, office equipment, industrial equipment etc. , please consult with us about usage condition (temperature, operation time etc.) prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer ' s products or equipment. D0711 SY 20111118-S00001 No.A1999-1/16 LV5028TT Continued from preceding page. Parameter Junction temperature Operating junction temperature Storage temperature Tj Topj (Note2) Tstg Symbol Conditions Ratings 150 -30 to +125 -40 to +150 Unit °C °C °C *1 Specified board: 58.0mm × 54.0mm × 1.6mm (glass epoxy board) Note1) Absolute maximum ratings represent the values which cannot be exceeded for any length of time. Note2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current, high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details. Recommended Operating Conditions at Ta = 25°C Parameter Input voltage * Note : supply the stabilized voltage. VIN Symbol Conditions Ratings 8.5 to 24 Unit V Electrical Characteristics at Ta = 25°C, VCC = 5.0V Ratings Parameter Reference voltage block Built-in reference voltage VREF VIN line regulation Reference output voltage - Maximum load - equivalent output impedance Under voltage lockout Operation start Input voltage Operation stop input voltage Hysteresis voltage Oscillation Frequency Maximum ON duty Comparator Input offset voltage (Between CS and VREF) Input offset voltage (Between CS and REFOUT) Input current IIOSC IIOREF CS pin max voltage malfunction prevention mask time Thermal protection circuit Thermal shutdown temperature Thermal shutdown hysteresis Drive Circuit OUT sink current OUT source current Minimum On time TRIAC Stabilization circuit Threshold of OUT2 OUT2 sink current OUT2 source current VCC current UVLO mode VIN current Normal mode VIN current ICCOFF ICCON VIN < UVLOON VIN > UVLOON, OUT = OPEN 80 0.8 120 μA mA Continued on next page. VACS IO2I IO2O OUT2 = High [less than right record] VIN = 12V, OUT2 = 6V VIN = 12V, OUT2 = 6V 2.8 3.0 0.6 0.6 3.2 V mA mA IOI IOO TMIN 500 1000 120 200 300 mA mA ns TSD ΔTSD *Design guarantee *Design guarantee 165 30 °C °C VOM TMSK 150 160 80 1 nA nA V ns VIO_RI 1 10 mV VIO_VR 1 10 mV FOSC MAXDuty 40 50 93 60 kHz % UVLOON UVLOOFF UVLOH 8 6.3 9 7.3 1.7 10 8.3 V V V VREF VREF_LN REFOUT REFOUT_MAX REFOUT_RO VIN = 8.5 to 24V IREFOUT = 0.5mA 0.5 10 0.585 0.605 ±0.5 3.0 0.625 V % V mA Ω Symbol Conditions min typ max Unit No.A1999-2/16 LV5028TT Continued from preceding page. Ratings Parameter VIN over voltage protection circuit VIN over voltage protection voltage VIN current at OVP VINOVP IINOVP VIN = 30V 24 0.7 27 1.0 30 1.5 V mA Symbol Conditions min typ max Unit CS terminal abnormal sensing circuit Abnormal sensing voltage CSOCP 1.9 V *: Design guarantee (value guaranteed by design and not tested before shipment) Package Dimensions unit : mm (typ) 3245B 3.0 8 3.0 4.9 1 (0.53) 2 0.65 0.25 (0.85) 1.1MAX 0.125 SANYO : MSOP8(150mil) Pin Assignment 0.08 0.5 ACS 1 REF_OUT 2 5 OUT2 6 VIN 7 OUT 8 GND (Top view) LV5028TT REF_IN 3 CS 4 No.A1999-3/16 LV5028TT Block Diagram VIN REF_OUT 3.0Vtyp Built-in REGULATOR TSD REFERENCE VOLTAGE OSCILATOR S R Current Limit Comparater Q CONTROL LOGIC OUT UVLO OVP 0.605V CS REF_IN + - Short Protection Circuit ACS OUT2 + GND Sample Application Circuit Non isolation F1 AC INPUT C2 D1 + D3 U1 OUT2 LV5028TT VCC ACS OUT REF_OUT REF_IN GND CS L R2 Q1 R1 R3 Isolation F1 AC INPUT C2 D1 + L1 NP D3 U1 OUT2 LV5028TT VCC ACS OUT REF_OUT REF_IN GND CS D7 RD0306 C13 NS LED 9pcs ND R2 Q1 R1 R3 No.A1999-4/16 LV5028TT Pin Functions Pin No. 1 ACS Pin name Pin function ACS pin senses AC Voltage. If this function isn’t used, please connect GND. Equivalent circuit VIN ACS GND 2 REF_OUT Built-in 3V Regulate out Pin. If this function isn’t used, please connect to nothing. VIN VREF-OUT (3V typ) GND 3 REF_IN External LED current Limit Setting pin. If less than VREF (0.61V) voltage is input, Peak current value is used at the input voltage. If more than REF_IN voltage is input, it is done at VREF voltage. If this function isn’t used, please connect nothing. VIN CS REF_IN GND 4 CS LED current sensing in. If this terminal voltage exceeds VREF (Or REF_IN), external FET is OFF. And if the voltage of the terminal exceeds 1.9V, LV5028TT turns to latch-off mod VIN CS REF_IN GND 5 6 7 GND OUT VIN GND pin. Driving the external FET Gate Pin. Power supply pin. Operation : VIN > UVLOON Stop: VIN < UVLOOFF Switching Stop : VIN > VINOVP VIN OUT GND 8 OUT2 This pin drive the FET which is stabilized the TRIAC dimming application. If ACS is less than 3V, OUT2 turn High voltage. If this function isn’t used, please connect nothing. VIN 1kΩ OUT2 GND No.A1999-5/16 LV5028TT LED current and inductande setting • Relation ship beween REF_IN and CS pin voltage(Power Factor Crrection(PFC)) The output current value is the average of the current value that flows during one cycle. The current value that flows into coil is a triangular wave shown in the figure below. Make sure to set Ipk so that (average of current value at one cycle) is equal to (LED current value).Ipk is set by the relationship between REF_IN voltage and Rcs voltage. This relationship make Power Factor Correction (PFC).Therefore, it is available to make LED current a sine curve. • Setting Zener voltage Vzd depend on LED voltage (VF). Choose Zener diode around Vf (LED voltage).When VAC voltage is lower than Vf, LED operation is not normal. Using Zener diode prevents incorrect operating during VAC voltage lower than Vf. In detail, refer to [LED current and inductance setting] In case of REF_IN pin open, this error amplifier negative input(-) is under control of internal VREF voltage (0.605Vtyp). a blockdiagram in outline L R1 Vzd REF_IN CLK OUT Q FET current Vac VREF (0.605V typ) REF_IN FET current CS + VREF (0.605V typ) RESET R2 Rcs FET Ton Toff T ON OFF Ipk = R2 (Vac-Vzd)× R1+R2 Rcs Ipk: peak inductor current Vf: LED forward voltage drop Vac: effective value, R.M.S value VREF: Built-in reference voltage (0.605V) VREF_IN: REF_IN voltage (6 pin) Rs: External sense resistor Vzd: Zener diode voltage (REF_IN pin) No.A1999-6/16 LV5028TT LED current and inductance setting It is available to use both no-isolation and isolation applications. (For non-isolation application) The output current value is the average of the current value that flows during one cycle. The current value that flows into coil is a triangular wave shown in the figure below. Make sure to set IL_PK so that (average of current value at one cycle) is equal to (LED current value). Vac LED a blockdiagram in outline L R1 Vzd REF_IN CLK Q OUT Inductor current Vac REF_IN VREF (0.605V typ)/built-in reference ILED slope is proportion to Vac voltage (REF pin voltage) T ON OFF Ipk = (Vac-Vf)/L × T_c = Vf/L × T_d CS + VREF (0.605V typ) RESET R2 Rcs FET Ipk IL = Vac/L × T Inductor current IL = Vf/L × T T_c FET_on T_d FET_off T (1cycle) Given that the period when current flows into coil is T_c+T_d DutyI = T 1 Ipk × 2 × (Duty × T)/T = ILED 2 × ILED VREF_IN Ipk × DutyI (1) since Ipk × Rcs VFEF_IN DutyI × VFEF_IN = (2) Rcs × 2ILED Ipk Ipk: peak inductor current Vf: LED forward voltage drop Vac: effective value(R.M.S value) VREF: Built-in reference voltage (0.605V) VREF_IN: REF_IN voltage (6 pin) Rs: External sense resistor Vzd: Zener diode voltage (REF_IN pin) Since formula for LED current is different between on period and off period as shown above, Vƒ Vac-Vƒ Ipk × L × T_c = L × T_d (3) Since T_c + T_d = DutyI × T, T_c = DutyI × T - T_d (4) Vac-Vƒ (5) Based on the result of (3) and (4), T_d = DutyI × T × Vac To obtain L from the equation (1), (3), (5), Vƒ × DutyI Vac - Vƒ Vƒ 1 Vac - Vƒ L× × DutyI × T = Vac = × × Vac × (DutyI)2 (6) 2 × ILED 2 × ILED ƒosc Since LED and inductor are connected in serial in non-isolation mode, LED current flows only when AC voltage exceed VF. No.A1999-7/16 LV5028TT √2 × Vrms VF Vac (AC voltage, R.M.S) Inductor current Arcsin (Vf/√2Vrms) Arcsin (Vf/√2Vrms) Arcsin (√2Vrms/√2Vrms) =90 (Deg) Given that the ratio of inductor current to AC input is DutyAC. Vƒ 90 - arcsin ( 2Vrms) √ DutyAC = 90 Since the period when the inductor current flows are limited by DutyAC, the formula (6) is represented as follows: 2 Vƒ 90 - arcsin ( 2Vrms) √ Vƒ 1 Vac - Vƒ L= × ×V × (DutyI)2 × (7) 90 2 × ILED ƒosc IN No.A1999-8/16 LV5028TT (for Isolation circuit) Using the circuit diagram below, the wave form of the current that flows to Np and Ns is as follows. Current waveform flows to primary side and secondary. Vac a blockdiagram in outline LP (Np) CLK REF_IN Ls (Ns) Ip (Primary side current) Vac REF_IN VREF (0.605V)typ Ip (primary side) Ip slope is proportion to Vac voltage (REF pin voltage) T ON OFF R1 Vzd Q OUT CS + VREF (0.605V typ) RESET R2 Rcs FET Is (Secondary side current) Is (Secondary side current) T Ipk_p Ipk_p = Vac/Lp × Ton_p Primary side Ip = Vac/Lp × Ton_p FET_ON (Ton_p) FET_OFF T(1cycle) Ipk_s Is = Vf/Ls × Ton_s Secondary side Iout Ipk_s = Vf/Ls × Ton_s (Ton_s) [Inductance Lp of primary side and sense resistor Rs] If a peak current flow to transformer is represented as Ipk_p, the power (Pin) charged to the transformer on primary side can be represented as: 1 Pin = 2 × Lp × (Ipk_p)2 × ƒosc (11) Vac Ipk_p = Lp × Ton_p (12) Vac2 × Ton_p2 × ƒosc Vac2 × Don_p2 = (13) Lp = 2 × Pin 2 × Pin× ƒosc (Don_p = Ton_p T = Ton_p × ƒosc), To substitute the following to the formula below, ...η = Pout (14) Pin ∴Lp = Vac2 × Ton_p2 × ƒosc × η Vac2 × Don2 × η = 2 × Pout 2 × Pout × ƒosc (15) No.A1999-9/16 LV5028TT Sense resistor is obtained as follows. Rs = VREF_IN VREF_IN × Lp VREF_IN × Lp Ipk_p = Vac × Ton_p = Vac × Don_p × T (16) [Inductance Ls of secondary side] Since output current Iout is the average value of current flows to transformer of secondary side Iout = Ipk_s × Ton_s 1 Ipk_s × Don_s Ton_s ×2= (Don_s = T = Ton_s × ƒosc) T 2 (18) (17) Vout Vout Don_s Ipk_s = Ls × Ton_s = Ls = ƒosc Ls = Vout × T × Don_s2 Vout × Don_s2 Vout2 × Don_s2 = = (19) 2 × Iout 2 × Iout × ƒosc 2 × Pout × ƒosc Calculation of the ratio of transformer coil on primary side and secondary side Since ratio and inductance of transformer coil is Ns √Ls Np = √Lp (20) substituted equations (15), (19) for (20) Np Vac Don_p ∴ Ns = Vout × √η × Don_s (21) Calculation of transformer coil on primary side and secondary side N= Vac × 108 (22) 2 × ΔB × Ae × ƒosc ΔB: variation range of core flux density [Gauss] Ae: core section area [cm2] To use Al (L value at 100T), N= √Al × 10 L 2 (23) L: inductance [μH] Al: L value at 100T [uH/N2] lg (Air gap) is obtained as follows: lg = μr μ0 N2 Ae 102 L (24) μr: relative magnetic permeability, μr = 1 μ0: vacuum magnetic permeability μ0 = 4π*10-7 N: turn count [T] Ae: core section area [m2] L: inductance [H] No.A1999-10/16 LV5028TT Bleeder current cuircuit for TRIAC dimmer 1. Operating voltage setting ACS pin voltage set operating voltage at OUT2. ACS pin threshold volage is 3V typ. OUT2 operating voltage is set by R1 and R2. R1 and R2 is determined below. R2 ACS = Vac × R1+R2 2. Bleeder current setting Rd set hold current at Triac dimmer. Bleeder current is set at Rd depending on Triac dimmer. a blockdiagram in outline a blockdiagram in outline VAC voltage is Low, OUT2 is High voltage Vac Triac dimmer, OFF Bleeder circuit, ON (OUT2; high) R1 ACS Rd R2 + VACS (3V typ) OUT2 ACS VACS (3V typ) OUT2 off OUT on min on on min on on on off on off No.A1999-11/16 LV5028TT Description of operation protection function tilte 1 2 3 4 UVLO OCP OVP OTP (TSD) outline Under voltage lock out Over current protection Over voltage protection Over Temperature Protection (Thermal Shut Down) VCC voltage CS voltage VCC voltage PN Junction temperature available FET current monitor point note 1. UVLO (Under voltage lock out) If VIN voltage is 7.3V or lower, then UVLO operates and the IC stops. When UVLO operates, the power supply current of the IC is about 80μA or lower. If VIN voltage is 9V or higher, then the IC starts switching operation. VIN voltage UVLOON (9V typ) A UVLOOFF (7.3V typ) B VCC voltage Outputstage on off on time 2. UVLO (Under voltage lock out) The CS pin sense the current through the MOS FET switch and the primary side of the transformer. This provides an additional level of protection in the event of a fault. If the voltage of the CS pin exceeds VCSOCP (1.9V typ) ( A ), the iternal comparator will detect the event and turn off the MOSFET. The peak switch current is calculated Io (peak) [A] = VSOCP [V]/Rsense [Ω] The VCC pin is pulled down to fixed level, keeping the controller lached off.The lach reset occurs when the user disconnects LED from VAC and lets the VCC falls below the VCC reset voltage, UVLOOFF (7.3V typ)( B ). Then VCC rise UVLOON (9V typ) ( C ), restart the switching. CS voltage CSOCP (1.9V typ) A C VIN voltage UVLOON (9V typ) UVLOFF (7.3V typ) Time B Time Outputstage on off on No.A1999-12/16 LV5028TT 3. OVP (Over voltage protection) If the voltage of VIN pin is higher than the internal reference voltage VINOVP (27V typ), switching operation is stopped. The stopping operation is kept until the voltage of VIN is lower than 7.3V. If the voltage of VIN pin is higher than 9V, the switching operation is restated. VIN voltage A OVP B OVP reset C Operation start 9V typ 7.3V typ Time 27V typ Outputstage on off on Time 4. TSD (Thermal shut down protection) The thermal shutdown function works when the junction temperature of IC is 165°C (typ) ( A ), and the IC switching stops. The IC starts switching operation again when the junction temperature is 135°C typ ( B ) or lower. Tj (Junction tmperature) 165°C 135°C TSD (design target) A B Time Outputstage on off on Time Skip frequency function LV5028TT contains the skip frequency function for reduction of the peak value of conduction noise. This function changes the frequency as follows. Skip frequency function VIN UVLO unlocked OUT 45k 55k 52.5k 50k 47.5k 45k …×0.9 → (45kHz) Switching frequency is changed as follows. ×1.1 → ×1.05 → ×1 → ×0.95 → (55kHz) (52.5kHz) (50kHz) (47.5kHz) It’s repeated by this loop. ×0.9 → (45kHz) ×1.1 … (55kHz) No.A1999-13/16 LV5028TT 0.63 VREF – Ta Reference output voltage, REFOUT -- V 3.2 REFOUT – Ta IREF_OUT = 0.5mA Built-in reference voltage, VREF -- V 0.62 3.1 0.61 VIN = 8.5V VIN = 12V VIN = 24V 3 0.6 2.9 0.59 0.58 --50 0 50 100 150 2.8 --50 0 50 100 150 Ambient temperature, Ta -- °C Operation start input voltage,Operation stop input voltage, UVLOON, UVLOOFF -- V 10 Ambient temperature, Ta -- °C 3 UVLOON, UVLOOFF – Ta Hysteresis voltage, UVLOH -- V UVLOH – Ta 9 UVLOOFF 2.5 2 8 UVLOON 7 1.5 1 6 0.5 5 --50 0 50 100 150 0 --50 0 50 100 150 Ambient temperature, Ta -- °C 60 Ambient temperature, Ta -- °C 80 FOSC1 – Ta FOSC2 – Ta Frequency, FOSC1 -- kHz Frequency, FOSC2 -- kHz 55 75 50 40 --50 0 50 100 150 60 --50 V IN =8 0 45 V1 24 = V IN V IN 5V 8. = N VI = 2V 70 65 = V 24V IN .5V = 12 V V IN 50 100 150 Ambient temperature, Ta -- °C 0.005 Ambient temperature, Ta -- °C 2 VIO_VR – Ta VOFF, VON – Ta Input offset voltage, VIO_VR -- V 0.003 1.8 0.001 --0.001 --0.003 --0.005 --50 OFF voltage, ON voltage, VOFF,VON -- % 0 50 100 1.6 1.4 1.2 150 1 --50 0 50 100 150 Ambient temperature, Ta -- °C Ambient temperature, Ta -- °C No.A1999-14/16 LV5028TT 0.2 IOO – Ta 2000 IOI – VO OUT source current, IOO -- A OUT sink current, IOI -- mA 0.15 1500 Ta = -40°C Ta = 0°C Ta = 25°C Ta = 80°C Ta = 125°C Ta = 150°C 0.1 1000 0.05 500 0 --50 0 0 50 100 150 0 1 2 3 4 Ambient temperature, Ta -- °C 3.2 Output voltage, VO -- V 2 VACS – Ta OUT2 sink current, IO2I -- mA IO2I – Ta Threshold of OUT2, VACS -- V 3.1 1.5 3 1 2.9 0.5 2.8 --50 0 50 100 150 0 --50 0 50 100 150 Ambient temperature, Ta -- °C 2 Ambient temperature, Ta -- °C 200 IO2O – Ta UVLO mode VIN current, ICCOFF -- μA ICCOFF – Ta OUT2 source current, IO2O -- mA 1.5 150 1 100 0.5 50 0 --50 0 50 100 150 0 --50 0 50 100 150 Ambient temperature, Ta -- °C 2 Ambient temperature, Ta -- °C ICCON – Ta Normal mode VIN current, ICCON -- mA 1.5 VIN = 24V 1 VIN = 12V VIN = 8.5V 0.5 0 --50 0 50 100 150 Ambient temperature, Ta -- °C No.A1999-15/16 LV5028TT VIN over voltage protection voltage, VINOVP -- V 30 VINOVP – Ta Abnormal sensing voltage, CSOCP -- V 3 CSOCP – Ta 29 2.5 2 28 1.5 27 1 26 0.5 25 --50 0 50 100 150 0 --50 0 50 100 150 Ambient temperature, Ta -- °C Ambient temperature, Ta -- °C SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. 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SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of December, 2011. Specifications and information herein are subject to change without notice. PS No.A1999-16/16