AME9003AETH AME, AME9003AETH Datasheet

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... However the AME9003 uses an extra capacitor to accurately set the start up interval. In addition to that the AME9003 features a soft start AND soft finish on each dimming cycle edge in order to minimize any audible vibrations during the dimming function. ...

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... AME, Inc. AME9003 n Pin Description Pin # Pin Name 1 VREF SSC 4 RDELTA 5 SSC1ST 6 RT2 7 VSS 8 OVPH 9 OVPL 10 FCOMP 2 Pin Description Reference. Compensation point for the 3.4V internal voltage reference. Must have bypass capacitor connected here to VSS. Chip enable. When low (<0.4V) the chip is put into a low current (~0uA) shutdown mode ...

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... AME, Inc. AME9003 n Pin Description Pin # Pin Name 11 CSDET 12 BATTFB 13 OUTC 14 OUTAPB 15 OUTA 16 VBATT 17 BRPOL 18 VDD 19 CT1 COMP 22 BRIGHT 23 SSV 24 PNP Pin Description Current sense detect. Connect this pin to the CCFL current sense resistor divider. During the initial startup period this pin senses that the CCFL has struck when V(CSDET) > ...

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... AME, Inc. AME9003 n Ordering Information AME9003 Operating Pin Configuration Temperature Range VREF E: - SSC 4 . RDELTA 5 . FAULTB 6 . RT2 7 . VSS 8 . OVPH 9 . OVPL 10. FCOMP 11. CSDET 12. BATTFB 13. OUTC 14. OUTAPB 15. OUTA 16. VBATT 17. BRPOL 18. VDD 19. CT1 20. FB 21. COMP 22. BRIGHT 23. SSV 24. PNP 4 Package Type SOIC (300 mil Plastic DIP ...

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... AME, Inc. AME9003 n Ordering Information (contd.) Part Number Marking* AME9003AETH AME9003AETH xxxxxxxx AME9003AETH AME9003AETHZ xxxxxxxx AME9003AEPH AME9003AEPH xxxxxxxx AME9003AEPH AME9003AEPHZ xxxxxxxx AME9003AEJH AME9003AEJH xxxxxxxx AME9003AEJH AME9003AEJHZ xxxxxxxx Note: yyww represents the date code * A line on top of the first letter represents lead free plating such as AME9003 Please consult AME sales office or authorized Rep ...

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... AME, Inc. AME9003 n Absolute Maximum Ratings Parameter Battery Voltage (VBATT) Enable ESD Classification Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device n Recommended Operating Conditions Parameter Battery Voltage (VBATT) Ambient Temperature Range Junction Temperature n Thermal Information ...

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... AME, Inc. AME9003 n Electrical Specifications TA unless otherwise noted, VBATT = 15V, CT1 = 0.047uF, RT2 = 56K Parameter 5V supply (VSUPPLY) Output voltage Line regulation Load regulation Temperature drift 3.4V reference (VREF) Initial voltage Line regulation Temperature drift Brightness oscillator (CT1, BRIGHT) Full Scale Brightness Threshold ...

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... AME, Inc. AME9003 n Electrical Specifications(contd.) TA unless otherwise noted, VBATT = 15V, CT1=0.047uF, RT2 = 56K Parameter Output A (OUTA) Peak current Output Low Voltage Output High Voltage Other outputs (OUTAPB, OUTC) Peak current Output Low Voltage Output High Voltage Soft start clamps (SSC, SSV) ...

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... AME, Inc. AME9003 n Block Diagram REF Chip Enable 2 Logic 1.5uA SSC 0.047 RDELTA V Supply 4 R3 15k C31 SSC1ST 0. FIRST B RT2 6 R2 40K VSS A 7 3.3V OVPH 2. R35 D16 2.5V OVPL 9 R36 FCOMP 10 RES_FCOMP C32 VDD 2.2nF R10 R42 1.25V 680 10k ...

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... AME, Inc. AME9003 n Application Schematic Figure 2. Double Tube Application Schematic (7V < Vbatt < 24V) 1 VREF SSC RDELTA R3 15k 5 SSC1ST C3 C31 0.047 F 0. RT2 R2 40K 7 VSS D17 8 OVPH C33 100p 9 OVPL D16 R36 10 FCOMP C32 2.2nF R45 11 CSDET 1M 12 BATTFB PNP 24 SSV 23 C14 ...

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... Steady State Circuit Operation Figure 1 shows a block diagram of the AME9003. Throughout this datasheet like components have been given the same designations even if they are on a differ- ent figure. The block diagram shows PMOS Q2 driving the center tap primary of T1. The gate drive ...

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... OUTAPB CCFL are the inverse of each other Control Circuitry R9+R10 CCFL Backlight Controller V BATT V - 7.5V BATT Figure 5. with parasitic elements (Same component designations used throughout) OUTA D = 0-100% Vhi = Vbatt Q2 Vlo = Vbatt-7. fosc Q3-1 Q3-2 1:N L leak C parasitic CCFL Control Circuitry ...

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... CCFL circuit in operation. These fig- ures show that the duty cycle of the gate drive at Q2 decreases as the battery voltage increases from (as one would expect in order to maintain the same output power). The first three traces in Figures 6 and 7 show the gate drive waveforms for transistors Q2, Q3-1, and Q3-2, re- spectively ...

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... AME, Inc. AME9003 Q2 Gate (OUTA) Q3-1 Gate (OUTAPB) Q3-2 Gate (OUTC) Center tap (Q2 DRAIN) Q3-1 Drain I DQ2 I DQ3-1 I LAMP Q2 Gate (OUTA) Q3-1 Gate (OUTAPB) Q3-2 Gate (OUTC) Center tap (Q2 DRAIN) Q3-1 Drain I DQ2 I DQ3-1 I LAMP 14 Figure 6. Typical Waveforms V Region Region Region ...

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... AME, Inc. AME9003 Figure 8-1. Region I I LEAK I Figure 8-3. Region III I I Figure 9. Steady State Dimming Waveforms (after initial start up period) BRIGHT CT1 SSV 3V SSC Blanked Faults CSDET < 1.25V Ignore OVPL > 2.5V Unblanked Faults OVPH > 3.3V Tube Current (time not ...

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... After the tube has struck the voltage at the transformer output is controlled by the IV relationship of the CCFL. Without the variable frequency drive available with the AME9003 the user is unable to control the voltage across the CCFL before the CCFL strikes and current starts flowing in the CCFL. ...

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... AME, Inc. AME9003 START Start 1 second timer F=Fmax Set SSV = 0V V(OVPL) > 2.5V No V(CSDET) < 1.25V No F > Fmin? Yes F(new)=F(old) - delta Figure 10. Ignition Flow Chart Yes No Timer Yes End? Yes Shutdown Yes Timer Yes End Start Up Side ------- ------ Steady State CCFL Backlight Controller V(OVPH)> ...

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... AME, Inc. AME9003 Figure 11. Start Up and Steady State Waveform BRIGHT * CT1 1.25V CSDET } VBATTOK VALID VDDOK SSC OVPH>3. MIN F COMP OVPL<2.5V OVPL>2.5V OVPL OVPL>2.5V <2.5V OVPH < 3.3V OVPH<3.3V OVPH < 3.3V SSV < Initial Start Up Period> IF: THEN: F ramps up OVPL<2.5V COMP OVPH<3.3V Frequency decreases ...

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... CSDET pin from tripping (for 8 consecutive clock cycles). Note that condition a) can be met at any time while the AME9003 is in steady state operation (after the start up mode). Condition b) can only be met after the SSC pin has risen above 3V (after blanking interval). Condition c) ...

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... AME, Inc. AME9003 The SSC pin is pulled to VSS everytime the lamp is turned off, whether for a dimming cycle, user shutdown or fault occurrence. It ramps up slowly depending on the size of capacitor C3 connected to the SSC pin (in steady state mode SSC1ST is high impedance so capacitor C31 has no effect). The period of time when the b) and c) fault ...

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... AME, Inc. AME9003 Outside Chip Inside Chip BRPOL BRIGHT Brightness control voltage CT1 C4 CHOP Always Hi EA1 - To PWM Comparator + - To Fault Control Logic Figure 12. Duty Cycle Dimming + - + - 3V - 50mV + Figure 13. Alternative Brightness Control Outside Chip Inside Chip BRPOL T1 BRIGHT COMP FB RF 2.5V 2R CSDET R-C-D ...

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... Figure 14 thereby decreasing the oscillator frequency. Supply voltage pins, VDD and PNP Most of the circuitry of the AME9003 works at 5V with the exception of one output driver. That driver (OUTA) and its power pad (VBATT) must operate up to 24V al- though the OUTA pad may never be forced lower than 8 volts away from the VBATT pin ...

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... This fault condition is used to check that a rea- sonable minimum amount of current is flowing in the tube. Figure simplified schematic of the fault protec- tion circuitry used in the AME9003. Most of the signals have been previously defined however some need a little explanation. The VDDOK signal is a power OK signal that goes high when the 5V supply (VDD) is valid ...

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... The schematic in Figure 18 attemps to show this star ground configuration by bring- ing all the ground returns back to the same point on the drawing. Separate ground returns back to the star are especially important for higher current switching paths. ...

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... AME, Inc. AME9003 VDD + 1.5V - RT2 R2 VSS Inside Chip Fault - + - EN 2.5V Figure 14. VCO Detail Vco_Control 0 I_in 50:1 curent divider I_out 3.0V Inside chip Outside chip Figure 15. LDO Detail PNP V DDOK VDD Logic CE Start UP CCFL Backlight Controller 1 A RDELTA 2.5V OVPL RAMP ...

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... AME, Inc. AME9003 PWM SIGNAL 26 Figure 16. OUTA Driver Circuitry BV=5V BV=4V 100nS 100nS CCFL Backlight Controller Inside Chip Outside Chip Vbatt BV=7.5V OUTA External PMOS, Q2 1mA ...

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... AME, Inc. AME9003 VDDOK BATTFB + - 1.25V 1.25V + - CSDET OVPL + 2.5V - SSC + 3.0V - BLNK OVPH CT1 Dimming Oscillator C4 CHOPIN - BRIGHT + BRPOL FCOMP Figure 17. Fault Logic CLK RES S 2Bit Counter L2 R BLK_CS S R VDDOK Q RES 2 Bit Shift D VDD CCFL Backlight Controller POR ...

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... The PMOS(Q2) gate drive is exactly twice this value This resistors pulls the base Vbatt. Coupled with Q1 and part of the 5V regulator that supplies the working power to the AME9003. When the PNP pin is turned off the base pulled high through R4, turning off Q1 and allowing the voltage at the VDD node (VSUPPLY) to decay towards zero ...

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... C7 - This capacitor is the load capacitor for the 5V linear regulator. As such it also bypasses the 5V sup- ply and should be laid out as close to the AME9003 as possible This capacitor, in combination with resistor R7, determines the time constant for the error amplifier (in- tegrator) EA1 ...

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... In this case R9B senses the current in the left tube in the same way R9A senses the current in the right hand tube. If the current through either tube is zero then R9A or R9B 30 CCFL Backlight Controller will try to pull node zero ...

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... AME, Inc. AME9003 BATT R1 1Meg BRIGHT R3 15k Vref 1uF AME9003 1 Vref PNP 2 CE SSV SSC BRIGHT 4 RDELTA COMP C31 0.047uF 5 SSC1ST F B 0.47uF 6 R2 RT2 CT1 VDD C1 40k 8 OVPH VDD1 0.1u 9 OVPL VBATT 10 FCOMP OUTA R40 C32 11 60K CSDET OUTAPB 2200p ...

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... AME, Inc. AME9003 OUTA OUTB Q3-1 OVPL/OVPH R37 R38 (B) R9B D22 VDD Figure 20. Double transformer construction detail Large Positive (Negative) Voltage 32 Figure 19. Double CCFL Power Section V B att Q2 T1 Q3-2 R35 R36 R10 (C) (A) D23 D21 D20 R9A R42 R43 C34 ...

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... AME, Inc. AME9003 OUTA Batt OUTAPB Q3-1 T1 OUTC Q3-2 Figure 21. Four Tube Power Section R35 R36 R37 R38 R39 R50 R51 R52 To R7 and C8 integrator CCFL Backlight Controller VDD R42 R43 D26 D24 D25 D23 D22 D4 D5 R40 C34 R10 R9A ...

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... AME, Inc. AME9003 NODE A NODE B NODE C filtered NODE A NODE B NODE C 34 Figure 22. Normal Operation (Filtered Voltage > 1.25V è No Fault) One Tube Missing Operation (Filtered Voltage < 1.25V è Fault) No Current in TUBE B unfiltered CCFL Backlight Controller unfiltered 1.25 1.25 filtered ...

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... AME, Inc. AME9003 n Package Dimension QSOP24 Top View D Bottom View K J Side View e b See Detail A End View R £c1 £c2 L1 £ Detail (c) (b) CCFL Backlight Controller MILLIMETERS SYMBOLS MIN MAX A 1.524 1.752 A1 0.101 0.228 A2 1.473REF b 0.203 0.304 b1 0.203 0.279 c 0.177 0.254 c1 0 ...

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... AME, Inc. AME9003 n Package Dimension SOIC24 Top View E Pin No.1 Indentifier Bottom View Side View D e End View C See Detail A 36 SYMBOLS Detail A £c L CCFL Backlight Controller MILLIMETERS INCHES MIN MAX MIN A 2.35 2.65 0.092 A1 0.10 0.30 0.004 A2 2.25 2.31 0.089 B 0 ...

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... AME, Inc. AME9003 n Package Dimension PDIP24 (300mil) Top View D Side View End View E1 E2 SYMBOLS CCFL Backlight Controller MILLIMETERS INCHES MIN MAX MIN A 3.71 4.31 0.146 A1 0.51 0.020 - A2 3.20 3.60 0.126 B 0.36 0.56 0.014 B1 1.27 TYP 0.050 TYP C 0.204 0.36 0.008 D 29 ...

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... These products of AME, Inc. are not authorized for use as critical components in life-support devices or sys- tems, without the express written approval of the president AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices and advises its customers to obtain the latest version of relevant information. ...

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