Ordering number : ENA2042A LV5026MC Bi-CMOS IC LED Driver IC http://onsemi.com Overview LV5026MC is a High voltage LED drive controller which drives LED current up to 3A with external MOSFET. LV5026MC 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 LV5026MC 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 • Short protection circuit • Various Dimming Control • Selectable reference Voltage -TRIAC & Analog Input & PWM Input -Internal 0.605V & External Input Voltage • Soft Start function • Low noise switching system/skip frequency function • Built-in TRIAC stabilized function - 5 stages skip mode Frequency • Built-in circuit of detection of overvoltage of CS pin. - Soft driving • Selectable Switching frequency [50kHz or 70kHz, open: 50kHz] Specifications Maximum Ratings at Ta = 25°C Parameter Maximum input voltage Symbol Conditions Ratings VIN max (Note1) REF_OUT, REF_IN, RT, CS, Unit -0.3 to 42 V -0.3 to 7 V -0.3 to 42 V PWM_D, ACS OUT1 pin VOUT_abs OUT2 pin VOUT2_abs Allowable power dissipation Pd max Junction temperature Tj With specified board* -0.3 to 42 V 1.0 W 150 °C Operating junction temperature Topj (Note2) -30 to +125 °C Storage temperature Tstg -40 to +150 °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. Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Semiconductor Components Industries, LLC, 2013 August, 2013 51012 SY/42512 SY 20120323-S00003 No.A2042-1/16 LV5026MC Recommended Operating Conditions at Ta = 25°C Parameter Input voltage Symbol Conditions Ratings VIN Unit 8.5 to 24 V * Note : supply the stabilized voltage. Electrical Characteristics at Ta = 25°C, VIN = 12V, unless otherwise specified. Parameter Symbol Ratings Conditions Unit min typ max 0.585 0.605 0.625 Reference voltage block Built-in reference voltage VREF VREF VIN line regulation VREF_LN VIN = 8.5 to 24V Reference output voltage REFOUT IREFOUT = 0.5mA - Maximum load REFOUT_MAX - equivalent output impedance REFOUT_RO V ±0.5 % 3.0 V 0.5 mA Ω 10 Under voltage lockout Operation start Input voltage UVLOON Operation stop input voltage UVLOOFF Hysteresis voltage UVLOH 8 9 10 V 6.3 7.3 8.3 V 1.7 V Oscillation Frequency FOSC1 RT =OPEN 40 50 60 kHz FOSC2 RT = REF_OUT 55 70 85 kHz FOSC1 Switch voltage VOSC1 FOSC2 Switch voltage VOSC2 2 5 V 0.5 V Maximum ON duty MAXDuty 93 VIO_VR 1 10 mV VIO_RI 1 10 mV % Comparator Input offset voltage (Between CS and VREF) Input offset voltage (Between CS and REFIN) Input current IIOSC IIOREF CS pin max voltage VOM malfunction prevention mask TMSK 160 nA 80 nA 1 150 V ns time PWM_D circuit OFF voltage VOFF 2 5 V ON voltage VON 0 0.6 V Thermal protection circuit Thermal shutdown temperature TSD *Design guarantee 165 °C Thermal shutdown hysteresis ΔTSD *Design guarantee 30 °C Drive Circuit OUT sink current IOI 1000 mA OUT source current IOO 500 120 mA Minimum On time TMIN 200 300 ns Continued on next page. No.A2042-2/16 LV5026MC Continued from preceding page. Parameter Symbol Ratings Conditions min typ Unit max TRIAC Stabilization circuit Threshold of OUT2 VACS OUT2 = High [less than right record] 2.8 3.0 3.2 V OUT2 sink current IO2I VIN = 12V, OUT2 = 6V 0.6 mA OUT2 source current IO2O VIN = 12V, OUT2 = 6V 0.6 mA UVLO mode VIN current ICCOFF VIN < UVLOON 80 Normal mode VIN current ICCON VIN > UVLOON, OUT = OPEN 0.8 VCC current 120 μA mA VIN over voltage protection circuit VIN over voltage protection voltage VINOVP VIN current at OVP IINOVP VIN = 30V 24 27 30 V 0.7 1.0 1.5 mA 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) 3426A 4.9 6 5 0.41 0.835 0.21 1.5 Allowable power dispation, Pd max - W 6.0 0.37 1.0 1.75 MAX 1 Pd max -- Ta 1.2 3.9 10 Spesified board: 58.0 × 54.0 × 1.6mm3 glass epoxy board 1.0 0.8 0.6 0.4 0.2 0.175 0 --30 0 30 60 90 120 150 Ambient temperature, Ta - °C SANYO : SOIC10 Pin Assignment RT 1 10 ACS REF_OUT 2 REF_IN 3 9 OUT2 LV5026MC 8 VIN CS 4 7 OUT PWM_D 5 6 GND (Top view) No.A2042-3/16 LV5026MC Block Diagram VIN Built-in REGULATOR REF_OUT UVLO TSD 3.0V OVP REFERENCE VOLTAGE 0.61V OSCILATOR S + - CS REF_IN Q CONTROL LOGIC R Current Limit Comparater OUT Short Protection Circuit - ACS OUT2 + AC_Voltage sense Comparater RT PWM_D GND Sample Application Circuit Non isolation F1 AC INPUT - C2 + D3 U1 9 OUT2 L 8 LV5026MC VCC 10 ACS OUT 7 R2 2 REF_OUT 3 4 REF_IN CS 5 PWM_D 1 RT GND 6 Q1 R1 R3 Isolation F1 AC INPUT D1 C2 - + L1 NP D3 U1 9 OUT2 LED 9pcs 10 ACS OUT 7 R2 2 REF_OUT 3 4 REF_IN CS 5 PWM_D 1 RT GND 6 RD0306 C13 NS ND 8 LV5026MC VCC D7 Q1 R1 R3 No.A2042-4/16 LV5026MC Pin Functions Pin No. 1 Pin name RT Pin function Equivalent circuit Switching frequency selection pin. VREF-OUT (3V typ) L or Open : 50kHz switching, H: 70 kHz switching. RT In case of 70kHz,connect RT pin to REFOUT pin. 1kΩ on time GND 2 REF_OUT Built-in 3V Regulate out Pin. VIN If this function isn’t used, please connect to nothing. VREF-OUT (3V typ) GND 3 REF_IN External LED current Limit Setting pin. If less than VIN 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. CS REF_IN GND 4 CS LED current sensing in. If this terminal voltage VIN exceeds VREF (Or REF_IN), external FET is OFF. And if the voltage of the terminal exceeds 1.9V, LV5026MC turns to latch-off mod CS REF_IN GND 5 PWM_D PWM Dimming pin.L or open: normal operation, H: Stop operation. VIN PWM_D 200kΩ 700kΩ GND 6 GND GND pin. 7 OUT Driving the external FET Gate Pin. 8 VIN VIN Power supply pin. Operation : VIN > UVLOON Stop: VIN < UVLOOFF OUT Switching Stop : VIN > VINOVP GND 9 OUT2 This pin drive the FET which is stabilized the TRIAC VIN dimming application. If ACS is less than 3V, OUT2 turn High voltage. If this function isn’t used, please connect nothing. 1kΩ OUT2 GND 10 ACS ACS pin senses AC Voltage. If this function isn’t used, please connect GND. VIN ACS GND No.A2042-5/16 LV5026MC 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). FET current Vac a blockdiagram in outline VREF (0.605V typ) L R1 CLK Vzd REF_IN Q FET current RESET + - CS REF_IN OUT T ON VREF (0.605V typ) FET R2 Rcs Ton Ipk = Toff OFF 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) 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). Inductor current Vac Vac REF_IN VREF (0.605V typ)/built-in reference LED a blockdiagram in outline L ILED slope is proportion to Vac voltage (REF pin voltage) R1 CLK Vzd REF_IN CS + - Q RESET OUT T ON FET OFF VREF (0.605V typ) R2 Rcs Ipk = (Vac-Vf)/L × T_c = Vf/L × T_d Ipk IL = Vac/L × T IL = Vf/L × T Inductor current T_c FET_on T_d FET_off T (1cycle) No.A2042-6/16 LV5026MC 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 L × T_c = L × T_d (3) Since T_c + T_d = DutyI × T, T_c = DutyI × T - T_d Ipk × (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 × 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. L× √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) √ 1 Vac - Vƒ Vƒ × × V × (DutyI)2 × (7) L= 90 2 × ILED ƒosc IN No.A2042-7/16 LV5026MC (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 Ip (Primary side current) LP (Np) Ls (Ns) Vac REF_IN R1 CLK Vzd REF_IN + - CS VREF (0.605V)typ Q RESET Ip (primary side) OUT Ip slope is proportion to Vac voltage (REF pin voltage) T ON VREF (0.605V typ) R2 Rcs FET OFF Is (Secondary side current) Is (Secondary side current) T Ipk_p = Vac/Lp × Ton_p Ipk_p Primary side Ip = Vac/Lp × Ton_p FET_ON (Ton_p) FET_OFF T(1cycle) Ipk_s = Vf/Ls × Ton_s Ipk_s Is = Vf/Ls × Ton_s Secondary side Iout (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) Lp = Vac2 × Ton_p2 × ƒosc Vac2 × Don_p2 = 2 × Pin 2 × Pin× ƒosc (Don_p = (13) Ton_p T = Ton_p × ƒosc), To substitute the following to the formula below, ...η = Pout Pin ∴Lp = (14) Vac2 × Ton_p2 × ƒosc × η Vac2 × Don2 × η = 2 × Pout 2 × Pout × ƒosc (15) No.A2042-8/16 LV5026MC 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 × = (Don_s = T 2 2 T = Ton_s × ƒosc) Vout Vout Don_s Ipk_s = Ls × Ton_s = Ls = ƒosc (17) (18) 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 Ls = 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.A2042-9/16 LV5026MC 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 R1 R2 ACS a blockdiagram in outline Rd + Triac dimmer, OFF Bleeder circuit, ON (OUT2; high) VAC voltage is Low, OUT2 is High voltage OUT2 Vac VACS (3V typ) VACS (3V typ) ACS OUT2 off on off on off on min on on min on on OUT No.A2042-10/16 LV5026MC Description of operation protection function tilte outline monitor point 1 UVLO Under voltage lock out 2 OCP Over current protection CS voltage 3 OVP Over voltage protection VCC voltage 4 OTP Over Temperature Protection PN Junction temperature (TSD) (Thermal Shut Down) note VCC voltage available FET current 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 B UVLOON (9V typ) VCC voltage A UVLOOFF (7.3V typ) Outputstage time on off on 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 A C CSOCP (1.9V typ) Time VIN voltage B UVLOON (9V typ) Time UVLOFF (7.3V typ) Outputstage on off on No.A2042-11/16 LV5026MC 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 27V typ 9V typ 7.3V typ Time Outputstage Time on off on 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 Time on off on Skip frequency function LV5026MC 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 Switching frequency is changed as follows. … ×0.9 → ×1.1 → ×1.05 → ×1 → ×0.95 → ×0.9 → ×1.1 … It’s repeated by this loop. No.A2042-12/16 LV5026MC PWM dimmer function LED current can be adjusted according to Duty of PWM pulse input to PWM dimmer pin. PWM pulse is High (2V to 5V) then switching operation stops, and LED current stops flowing. PWM pulse is Low (under 0.6V), then switching operation stop is released, and it returns to normal operation. An outline of PWM_D pin LED current vs PWM_D duty (outline) LED current PWM_D max Threshold voltage, 1.5V (typ). (note) at PWM_D pin, input voltage is, 2V avove - output OFF 0.6V below - output ON 0 0 [%] AC PWM_D 100 [%] PWM_D H L PWM_D Duty (High side) [%] Outputage ON OFF H L OUT (FET gate) PWM_D OUT (FET gate) FET current (CS voltage) No.A2042-13/16 LV5026MC VREF – Ta 3.2 Reference output voltage, REFOUT -- V Built-in reference voltage, VREF -- V 0.63 0.62 0.61 VIN = 8.5V VIN = 12V VIN = 24V 0.6 0.59 0.58 --50 0 50 100 REFOUT – Ta IREF_OUT = 0.5mA 3.1 3 2.9 2.8 --50 150 0 UVLOON, UVLOOFF – Ta 10 UVLOON 7 6 0 50 100 2 1.5 1 0.5 0 --50 150 0 FOSC1 – Ta 100 150 FOSC2 – Ta 80 = V 24V I .5V N = 12 V 70 V IN 65 =8 V 1 24 = IN V V IN 5V 8. = N VI = 75 V IN 2V 45 50 Ambient temperature, Ta -- °C 55 50 150 2.5 Ambient temperature, Ta -- °C 60 Frequency, FOSC1 -- kHz Hysteresis voltage, UVLOH -- V 8 5 --50 100 UVLOH – Ta 3 UVLOOFF 9 50 Ambient temperature, Ta -- °C Frequency, FOSC2 -- kHz Operation start input voltage,Operation stop input voltage, UVLOON, UVLOOFF -- V Ambient temperature, Ta -- °C 40 --50 0 50 100 60 --50 150 Ambient temperature, Ta -- °C VIO_VR – Ta 100 150 VOFF, VON – Ta 2 0.003 1.8 1.6 0.001 --0.001 1.4 --0.003 --0.005 --50 50 OFF voltage, ON voltage, VOFF,VON -- % Input offset voltage, VIO_VR -- V 0.005 0 Ambient temperature, Ta -- °C 1.2 0 50 100 Ambient temperature, Ta -- °C 150 1 --50 0 50 100 150 Ambient temperature, Ta -- °C No.A2042-14/16 LV5026MC IOO – Ta 0.15 0.1 0.05 0 --50 IOI – VO 2000 OUT sink current, IOI -- mA OUT source current, IOO -- A 0.2 Ta = -40°C Ta = 0°C Ta = 25°C 1500 Ta = 80°C Ta = 125°C Ta = 150°C 1000 500 0 0 50 100 150 0 1 Ambient temperature, Ta -- °C VACS – Ta 3.1 3 2.9 2.8 --50 0 50 100 UVLO mode VIN current, ICCOFF -- μA OUT2 source current, IO2O -- mA 1 0.5 100 150 Ambient temperature, Ta -- °C 50 ICCOFF – Ta 150 100 50 0 --50 0 50 100 150 Ambient temperature, Ta -- °C ICCON – Ta 2 Normal mode VIN current, ICCON -- mA 0 200 50 150 0.5 Ambient temperature, Ta -- °C IO2O – Ta 0 100 1 0 --50 150 1.5 0 --50 4 1.5 Ambient temperature, Ta -- °C 2 3 IO2I – Ta 2 OUT2 sink current, IO2I -- mA Threshold of OUT2, VACS -- V 3.2 2 Output voltage, VO -- V 1.5 VIN = 24V VIN = 12V 1 VIN = 8.5V 0.5 0 --50 0 50 100 150 Ambient temperature, Ta -- °C No.A2042-15/16 VINOVP – Ta 30 29 28 27 26 25 --50 0 50 CSOCP – Ta 3 Abnormal sensing voltage, CSOCP -- V VIN over voltage protection voltage, VINOVP -- V LV5026MC 100 Ambient temperature, Ta -- °C 150 2.5 2 1.5 1 0.5 0 --50 0 50 100 150 Ambient temperature, Ta -- °C ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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