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1、 Page 1 OZ562 Two-Channel High Power LED Driver April 2013 Provided by O2Micro Panel Lighting = TV screen? OZ562 was born DC/DC Converter PFC OZ8023 or OZ531/A AC 85 265Vac LED Current Balance Primary side Secondary side OZ562 OZ9907 OZ9967 LED Driver for Panel Lighting WLLC OZ562 Application (Induc
2、tor mode) Page 4 Note: VLED range 46V 80V LED current range: 450mA 45mA (ADIM control 3V 0.3V) 500mW CS 1 VLED VINS C16 0.01uF R25 240k R28 10k R24 1k R30 13.7k PWM2 C8 47u,200V R18 2.2/1210 C13 2.2u,25V R2 200 PWM1 Q2 1A,250V R22 1k 1 ENA R19 10k R7 2.2/1210 C15 2.2u,25V L1 470uH C17 0.1uF/200v 1 P
3、WM2 1 ADIM 1 PWM1 R20 51k 1 LED2- DRV1 1 DRV2 2 GND 3 ISEN1 4 ISEN2 5 ADIM 6 PWM1 7 PWM2 8 ENA 9 CMPO 10 VSEN 11 ADJF 12 VREF 13 RT 14 STATUS 15 VCC 16 U2 OZ562 1 LED1- ISEN1 21 D7 200V 12VDC R27 1k R3 200 R5 4.7M R29 NC L R8 1k 21 D8 200V N E C18 0.1uF/200v L2 470uH R33 1k R34 1k DRV2 ISEN2 R35 1k
4、Q3 1A, 250V 1 2 3 J1 AC Input Device C19 220p NTC VLED 2 1 3 4- + D2 KBL608 F1 FUSE 2FB C20 220p VDC MOSD D91N4148 VLED STR1 12VDC Voltage regulator R36 10k VDD 1W TO92-3 R38 1.8k Q4 2N5830 ZD2 12V 12 43 U3 12VDC C11 0.1uF R15 51R 2 3 1 Q1 5N60 R11 4.7M C21 open CY1 1nF/100V R1 47 D101N4148 C1 100p/
5、400V C14 100p 9 5 3 1 2 4 10 T1 54:13:29 C9 100p/650V C3 10nF/1kV 21 D1 400V, 3A 2CS STR2 DRV D6 1N4148 2VDD AUX R10 10k R9 4.7M FB C10 15n VDD 6 CS 3 VINS 1 HV 8 FB 2 GND 4 GATE 5 NC 7 U1 OZ531 VLED QSNU D4 FR107 + C4 100u/400V R23 0.5 D5 1N4148 R6 100k + C12 22uF/50V R16 400 R26 0 R14 47 R21 0 DRV
6、2 R17 open R13 10k C2 47u,200V GATE C22 open Page 5 Features Switch-mode Buck regulator controller for 1 or 2 strings of LEDs Buck regulator: average inductor-current mode or inductor-less mode O2-IP, ex. US 8,237,379; US 8,253,352; etc. . Integrates shunt regulator (eliminates external TL431 circui
7、try) reduces system design cost Optimizes efficiency DC voltage for LEDs is adaptively controlled to maximize Buck converter efficiency O2-IP refer to DS Option: user-friendly, can pass the feature 100:1 individual PWM dimming control (sufficient ? Lets discuss) 10:1 analog dimming control for both
8、channels OZ562 protections -SCP/OCP: LED short circuit / Over current protection -OLP: Open LED string protection -UVP: VREF under voltage protection -OTP: IC over temperature protection Efficiency Page 6 ADIM(V) Vin(V) Iin(A) Pin(W) VLED1(V) ILED1(mA) VLED2(V) ILED2(mA) Pout(W) Efficiency(%) 3 69 0
9、.755 52.095 53.5 447 53.7 453 48.2 92.6 2 63 0.519 32.697 50.4 298 50.6 304 30.4 93 1 57 0.264 15.048 46.4 148.1 46.6 153.8 14 93.3 0.3 50 0.087 4.35 43 44.4 43.2 49.6 4.1 93.1 1. Efficiency measurement: PWM Dimming Linear, Wide-range Page 7 PWM(%) ILED1(mA) ILED2(mA) 100 447 453 80 357 363 50 223 2
10、27 25 111.6 113.4 10 44.4 45.1 5 22 22.4 1 4.2 4.2 PWM (ex. 250Hz) dimming (ADIM=3V) 0 50 100 150 200 250 300 350 400 450 500 0 20 40 60 80 100 ILED1(mA) ILED2(mA) PWM Dimming Linearity I_LED PWM VLED; PWM; ILED1/2 2 channels together PWM1, ILED1; PWM2, ILED2 Individual control PWM Dimming How Wide
11、? Page 8 Min PWM dim ON time: (ADIM=3V) * Min PWM ON time is 5 DRV cycles in IC design - with inductor mode in Buck regulator Ex. 250 KHz, operating frequency, to obtain 100:1 PWM dimming ratio, the PWM dimming frequency is set to then fPWM 100:1 dimming ratio, the PWM dimming frequency is set to 3V
12、, the switching frequency folds back to half (1/2) * If SCP condition is kept for 20ms, the corresponding channel will shutdown and stay latched DRV1; STATUS; ISEN2; ILED1 DRV1; DRV2; ISEN2 Protections Page 16 - LED Short-Circuit Protection (Inductor-less mode) - SCP_Frequency foldback - SCP_Shutdow
13、n delay time * SCP is triggered point is ISEN4V the switching frequency folds back to ; * If SCP condition is kept for 20ms, the corresponding channel will shutdown and latch; Protections Table Page 17 Protection Trigger Condition TIMER available 20ms IC Latch Status VREF Under Voltage Lockout VREF
14、4.35V No No No effect Over Voltage Protection / LED Open String Adaptive Voltage mode: ISEN 3V Yes When both channels are in OCP Low Fixed Voltage mode: ISEN 4V Over Temperature Protection TJUNCTION 160C Resumes: TJUNCTION 130C No No Low Block Diagram Page 18 1V Reference DIV3 1V 0.1V HFOSC VCC VREF GND BLON ADIM RT STATUS VSEN CMPO DRV1 PWM1 ISEN1 DRV2 PWM2 ISEN2OCP OLP OTP shunt_regulator driver1 driver2 EA EA vref vref ADJF Feedback Adjustment EA1 EA2 ADJ PWM2PWM1 CT1 CT2 CT1 CT2 VCC VCC LED_ON/OFF 2.5V EA1 EA2 - + - + Cc1 - + - + Cc2 Rc1 - + Rc2 - +