Self-oscillating Half-bridge Power IC

Transcription

1 Self-oscillating Half-bridge Power IC Features Integrated half-bridge 440V power MOSFET Floating channel designed for bootstrap operation Noise immunity of transient voltage Under-voltage lockout Programmable oscillator frequency Matched propagation delay for both channels Ultra low startup current of 150uA Shutdown function turns off both channels Low side output in phase with R T Description GL6955 is a high voltage monolithic IC with integrated 440V half-bridge power MOSFET. Proprietary HVIC and latch immune CMOS technologies enable ruggedized monolithic construction. The front end features a programmable oscillator which is similar to the 555 timer. The output drivers feature a high pulse current buffer stage and an internal dead time designed for minimum driver cross-conduction. Propagation delays for the two channels are matched to simplify use in 50% duty cycle applications. Applications Compact Fluorescent Lamp (CFL) Cold Cathode Fluorescent Lamp (CCFL) Ordering and Marking Information DIP-8 Code A B G H I J Year Code A B C Month Jan. Feb. Mar. Apr. Sep. Oct. Nov. Dec. Grenergy OPTO Inc. reserves the right to make changes to improve reliability or manufacture ability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders Ver. B Copyright Grenergy OPTO, Inc. 1

2 Pin Configuration TOP VIEW Pin Description Pin No. Name Function 1 VCC Input low voltage supply 2 FQ Running frequency is determined by external Rt(Ω), Ct(F), and Frun(Hz) = 0.94/(RtCt). The preheat frequency is around 1.7 times of Frun 3 PT Preheat time setting by external Rp Cp, and Tpre=7.7RpCp 4 SGND Signal ground 5 PGND Power ground 6 VS High side floating supply return, and half bridge output 7 HV High voltage input 8 VB High side gate driver floating supply Ver. B Copyright Grenergy OPTO, Inc. 2

3 Block Diagram VCC 1 UVLO Protection & Vbias Vbias 8 VB 7 HV FQ 2 Dead Time Level shift High side driver PT 3 Saw-tooth Preheat time control Oscillator Divider 2 6 VS Dead Time Low side driver 4 SGND 5 PGND Absolute Maximum Ratings Supply voltage VCC V VB V ~ 440V VS VB-25V ~ VB+0.3V HV VS-0.3V ~ VB+0.3V RT, CT V ~ VCC+0.3V Junction temperature Operating ambient temperature ~ 85 Storage temperature range ~ 150 DIP-8 package thermal resistance /W Power dissipation (DIP-8, at ambient temperature = 85 ) mW Lead temperature (All Pb free packages, soldering, 10sec) ESD voltage protection, human body model KV ESD voltage protection, machine model V Ver. B Copyright Grenergy OPTO, Inc. 3

4 Recommended Operating Conditions Preliminary GL6955 Item Min Max Unit Supply voltage VCC V Supply voltage VBS VCC V Supply voltage HV 400 V CFL (Input power) 23 W Ver. B Copyright Grenergy OPTO, Inc. 4

5 Electronic Characteristics (VCC=12V and Ta=25, unless otherwise specified.) Parameter Conditions Symbol Min Typ Max Unit Low Voltage Supply Characteristics Rising VCC under-voltage lockout threshold Falling VCC under-voltage lockout threshold V CCUV V V CCUV V VCC under-voltage lockout Hysteresis V CCUVH V Micropower startup VCC supply current V CC V CCUV I QCCUV 150 µa Quiescent VCC supply current I QCC 500 µa VCC operating voltage Vop V Floating Supply Characteristics Micropower startup VBS supply current V CC V CCUV I QBSUV 0 10 µa Quiescent VBS supply current I QBS µa Offset supply leakage current VB=VS=600V I LK 50 µa OUTPUT DRIVERS High level output voltage, VBIAS-VO I O = 0A V OH 11.0 V Low level output voltage, VO I O = 0A V OL 0.5 V UV-mode output voltage, VO I O = 0A V CC V CCUV V OL_UV 0.5 V Output rise time T R ns Output fall time T F ns Output deadtime (HO or LO) T D µs OSCILLATOR I/O CHARACTERISTICS LO output deadtime 1 HO output deadtime 1 µs Preheat time Cp = 330 nf Rp = 400kΩ T PRE 1 S Ignition time Cp = 330 nf Rp = 400kΩ T IGNI 20 ms Start frequency Ct =220pF Rt =96kΩ F ST 96 KHz Preheat frequency Ct = 220pF Rt =96kΩ F PRE 77 KHz Run frequency Ct =220pF Rt = 96kΩ F RUN 44.5 KHz BUILT-IN MOSFET CHARACTERISTICS Drain source break down voltage V GS = 0V I D =250uA BV DSS 440 V Peak drain V GS =10V Ta = 25 I D 1.5 A Ver. B Copyright Grenergy OPTO, Inc. 5

6 Drain - source on state resistance Drain source leakage current Gate threshold voltage Diode forward voltage V GS =10V I D =0.2A V DS = 400V V GS = 0V Tj = 25 o C V DS = 400V V GS = 0V Tj = 125 o C V DS = V GS I D = 250uA V DS = 0V I D = 0.3A Rds(on) Ω I DSS 25 ua 250 ua V TH V V SD 1.0 V Typical Application Circuit Ver. B Copyright Grenergy OPTO, Inc. 6

7 Application Information Operating timing Freq. 2.16*fo Soft start 1.7*fo 1.0*fo 5ms Preheat t=7.7rp*cp Ignition 20ms Cp=330nF Rp=400K Normal run fo=0.94/rt*ct t Fig. 6 The operating frequency versus timing diagram of the GL6955 at the startup period is shown as Fig. 6. For the preheat time setting is decided by the formula as below: T_preheat=7.7*Rp*Cp Where the resistor Rp and capacitor Cp are connected on pin 3. The Operating frequency decided by the formula as below: F_operating=0.94/(Rt*Ct) Where the resistor Rt and capacitor Ct are connected on pin 2. The preheat frequency is decided by the formula as below: F_preheat=1.7*F_operating Ver. B Copyright Grenergy OPTO, Inc. 7

8 Package Information DIP-8 SYMBOL MILLIMETERS INCHES MIN. MAX. MIN. MAX. A A A b b c D D E E e 2.54 BSC BSC ea 7.62 BSC BSC eb L Note : 1. Followed from JEDEC MS-001 BA 2. Dimension D, D1 and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 10 mil. Grenergy OPTO, Inc. reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete Ver. B Copyright Grenergy OPTO, Inc. 8