KA7543 Fairchild Semiconductor, KA7543 Datasheet
KA7543
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KA7543 Summary of contents
Page 1
... External component counts can be reduced by adopting the KA7543. Current feedback control method of the inverter status is one of the most attractive merits in KA7543. Internal soft start circuitry eliminates the need for external soft start discrete components. Voltage controlled soft dimming circuit is built into the IC to control the lighting output in a wide range ...
Page 2
... KA7543 Internal Block Diagram OUT1 UVLO 1. Vcc 2V Vref (bandgap regulator + 5/2 Current amp Vfb 30k Vab 7 + 3pF - 2V Abnormal protection 2 Output stage Frequency divider - Reset Supply Internal Oscillator bias 7V bias Dimming starter 5.7V 2V 5.7V Mirror is Switch + Mirror - id 1/2 is-id ir Selecter OUT2 ...
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... Abnormal Protection Input 8 Vld Lamp Detection Input 9 Vdm Dimming Control Input 10 Cs Soft Start Time Control Input 11 Cdm Soft Dimming Control Input 12 GND Ground Connection 14 OUT2 Drive Output 2 NC GND Cdm Cs Vdm KA7543 NC Vcc Cc V5 Vfb Pin Function Description KA7543 Vld Vab 3 ...
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... KA7543 Absolute Maximum Ratings Parameter Supply Voltage Peak Drive Output Current Drive Output Clamping Diodes V > < -0 Operating Temperature Range Storage Temperature Range Power Dissipation Thermal Resistance (Junction-to-Air) Absolute Maximum Ratings ( 125 C) Parameter Temperature Stability For Reference Voltage (Vref) Temperature Stability For Operating Frequency (fs) ...
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... C fss Vdm - Vdm Vdm = 0V Vdm Vdm = 0V tr Vcc =12V,CI =1nF tf Vcc =12V,CI =1nF Vomin( 5V, I =100 Vld - Vab - Vso - Vnd - Vpr - KA7543 Min. Typ. Max. Unit 0.425 0.5 0.575 V 0.85 1 1.15 V 5.5 5 kHz 1.2 1.4 1 kHz 9 ...
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... KA7543. Protection circuitry, no lamp protection, abnormal protection, one lamp detection, UVLO and restart on lamp adding have been included in the KA7543. Fig. 1 shows the operational characteristic of the KA7543 according to time and lamp count variation. When the Vcc voltage reaches the start-up threshold voltage(9.5V), the soft start capacitor begins to be charged ...
Page 7
... The lowest operating frequency guarantees the zero voltage switching operation of the ballast system. Dimming starter - + 5.7V Mirror is isr 20k Figure 3. Soft Start - Limiter + + ict - 8ict Oscillator Figure 4. Oscillator KA7543 Soft starter 55pF 7 ...
Page 8
... KA7543 Dimming Control Stage error amp (+) is-id The condition for full dimming is when the Vdm voltage is 2V and the condition for full lighting is when the Vdm voltage is 0V. Dimming operation starts when Vcs becomes 4V and the change rate of dimming is determined by the capacitor connected to the Cdm pin ...
Page 9
... The feedback reference voltage of the two lamps condition is twice that of one lamp condition. To output + Q S 3pF - From no lamp Figure 7. Abnormal Protection Circuit Cc 1/2 is-id Selecter - + 3V Figure 8. Lamp Selector Stage KA7543 Protection reset + 0.7V - Vct 30k Vld - 8 5pF + 1V No-lamp pretection 9 ...
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... KA7543 Application Circuit <85 ~ 265V Input, 400V , Fluorescent Lamps Ballast(32W*2 / 36W*2)> NTC TNR INPUT C22C23C13 KA7543 C11 R11 R10 C12 R21 C24 ZD1 Vdm(0~2V FAN7527B C7 C8 C10 R12 T2 Q2 R14 1 C14 14 R13 R15 C17 C15 L2 L3 C18 C16 D7 R16 R17 C21 ...
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... Line Filter 3.1mH(120T) 0.9mH(80T:6T) 1.2mH(30T:60T) 250V, 3A 470V 10 Note Manufacturer 1/ 1/ 1/ 1/4W - 1/4W - 1/4W - 1/4W - Box-Cap - Y-Cap - - - MLCC - Ceramic - - Ceramic - Ceramic - Ceramic - - - - - Fairchild 1N4007 - BYV26C - 1N4937 - 1N4148 - 1N4744 - - EI2820 - EI2820 - EE1614 - Fuse - 471 - 10D09 - KA7543 11 ...
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... KA7543 Components List(36W*2Lamp Application) Part Number R1 R2 R3 R10 R12, 13 R14 R15, 16 R17, 18 R19 C1 C10 C12, 21 C13 C14 C15,16 C17, 18, 19, 20 C22 ZD1 L1 L2 TNR NTC 12 (Continued) Value 1.8M 22k 150k 22k 10 0. 103 Variable resistor 6.8 ...
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... Mechanical Dimensions Package 6.40 0.20 0.252 0.008 #1 # 7.62 0.300 Dimensions in millimeters 14-DIP 3.25 0.20 0.128 0.008 5.08 MAX 0.200 KA7543 0.20 MIN 0.008 3.30 0.30 0.130 0.012 13 ...
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... KA7543 Mechanical Dimensions Package #1 #7 6.00 0.236 3.95 0.156 0.225 0.60 0.20 0.024 0.008 14 (Continued) 14-SOP 1.55 0.10 0.061 #14 #8 0.30 1.80 MAX 0.071 0.012 0.20 0.008 5.72 Dimensions in millimeters 0.05 MIN 0.002 0.004 ...
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... Ordering Information Product Number Package KA7543 14-DIP KA7543D 14-SOP Operating Temperature - +125 C KA7543 15 ...
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... KA7543 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. ...