Ordering number : ENA1999 LV5028TT Bi-CMOS IC LED Driver IC Overview 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 Symbol Conditions VIN max (Note1) REF_OUT, REF_IN, CS, Ratings Unit -0.3 to 42 V -0.3 to 7 V PWM_D, ACS OUT1 pin VOUT_abs -0.3 to 42 V OUT2 pin VOUT2_abs -0.3 to 42 V Allowable power dissipation Pd max 1.0 W With specified board* 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 Symbol Conditions Ratings Unit 150 °C Topj (Note2) -30 to +125 °C Tstg -40 to +150 °C Junction temperature Tj Operating junction temperature Storage temperature *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 Symbol Conditions Ratings VIN Unit 8.5 to 24 V * Note : supply the stabilized voltage. Electrical Characteristics at Ta = 25°C, VCC = 5.0V Ratings Parameter Symbol Conditions Unit min typ max 0.585 0.605 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 0.625 ±0.5 V % 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 6.3 9 10 V 7.3 8.3 V 1.7 V Oscillation Frequency FOSC Maximum ON duty MAXDuty 40 50 93 60 kHz VIO_VR 1 10 mV VIO_RI 1 10 mV % Comparator Input offset voltage (Between CS and VREF) Input offset voltage (Between CS and REFOUT) Input current IIOSC 160 IIOREF CS pin max voltage VOM malfunction prevention mask TMSK nA 80 nA 1 150 V ns time Thermal protection circuit Thermal shutdown temperature TSD *Design guarantee 165 °C Thermal shutdown hysteresis ΔTSD *Design guarantee 30 °C 1000 mA Drive Circuit OUT sink current IOI OUT source current IOO 500 120 Minimum On time TMIN 200 300 3.0 3.2 mA ns TRIAC Stabilization circuit Threshold of OUT2 VACS OUT2 = High [less than right record] OUT2 sink current IO2I VIN = 12V, OUT2 = 6V 2.8 0.6 mA V 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 Continued on next page. No.A1999-2/16 LV5028TT Continued from preceding page. Ratings Parameter Symbol Conditions Unit min typ max 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) 3245B 3.0 0.5 4.9 3.0 8 1 (0.53) 2 0.65 1.1MAX 0.125 0.08 (0.85) 0.25 SANYO : MSOP8(150mil) Pin Assignment 5 OUT2 ACS 1 REF_OUT 2 LV5028TT 6 VIN REF_IN 3 7 OUT CS 4 8 GND (Top view) No.A1999-3/16 LV5028TT Block Diagram VIN Built-in REGULATOR REF_OUT 3.0Vtyp UVLO TSD 0.605V OVP REFERENCE VOLTAGE OSCILATOR + - CS REF_IN S Q CONTROL LOGIC R Current Limit Comparater OUT Short Protection Circuit - ACS OUT2 + GND Sample Application Circuit Non isolation F1 AC INPUT D1 C2 - + D3 U1 OUT2 L LV5028TT VCC ACS R2 OUT REF_OUT REF_IN Q1 CS R1 GND R3 Isolation F1 AC INPUT D1 C2 - + L1 NP D3 U1 OUT2 ACS R2 OUT REF_OUT REF_IN RD0306 C13 NS LED 9pcs ND LV5028TT VCC D7 Q1 CS R1 GND R3 No.A1999-4/16 LV5028TT Pin Functions Pin No. 1 Pin name ACS Pin function Equivalent circuit ACS pin senses AC Voltage. VIN If this function isn’t used, please connect GND. ACS 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, LV5028TT turns to latch-off mod CS REF_IN GND 5 GND GND pin. 6 OUT Driving the external FET Gate Pin. 7 VIN VIN Power supply pin. Operation : VIN > UVLOON Stop: VIN < UVLOOFF OUT Switching Stop : VIN > VINOVP GND 8 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 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). FET current a blockdiagram in outline Vac L R1 CLK Vzd REF_IN CS + - OUT VREF (0.605V typ) Q REF_IN RESET FET current VREF (0.605V typ) R2 T ON Rcs FET 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) 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 Inductor current LED Vac a blockdiagram in outline REF_IN VREF (0.605V typ)/built-in reference L R1 CLK Vzd REF_IN CS + - Q RESET ILED slope is proportion to Vac voltage (REF pin voltage) OUT VREF (0.605V typ) T ON FET R2 OFF 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 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 T_d FET_off T (1cycle) 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 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) 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 × = (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.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 R1 R2 ACS a blockdiagram in outline + Triac dimmer, OFF Bleeder circuit, ON (OUT2; high) VAC voltage is Low, OUT2 is High voltage Rd OUT2 Vac VACS (3V typ) VACS (3V typ) ACS OUT2 off on off on off on min on on min on on OUT No.A1999-11/16 LV5028TT Description of operation protection function tilte 1 UVLO 2 3 4 outline monitor point Under voltage lock out VCC voltage OCP Over current protection CS voltage OVP Over voltage protection VCC voltage OTP Over Temperature Protection PN Junction temperature (TSD) (Thermal Shut Down) note 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.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 B OVP reset A OVP 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 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 …×0.9 → (45kHz) 55k 52.5k 50k 47.5k 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) 45k ×1.1 … (55kHz) No.A1999-13/16 LV5028TT 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.A1999-14/16 LV5028TT 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.A1999-15/16 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 LV5028TT 100 Ambient temperature, Ta -- °C 150 2.5 2 1.5 1 0.5 0 --50 0 50 100 150 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. SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written consent of SANYO Semiconductor Co.,Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO Semiconductor Co.,Ltd. product that you intend to use. Upon using the technical information or products described herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third party. 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