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KA7543
Advanced Feedback Dimming Ballast Control IC
Features
* * * * * * * * * * * * * Lamp Current Feedback Soft Start on Feedback Voltage Dimming (0V~2V) on Feedback Switch off Control (Vdm=5V) Soft Dimming Control No Lamp Protection One Lamp Detection for Feedback Abnormal Protection Low Start-up and Operating Supply Current UVLO with 1.8V Hysteresis Totem Pole Output Trimmed 1.5% Internal Bandgap Reference 14-DIP & 14-SOP
Descriptions
The KA7543 is an advanced lamp current feedback dimming control IC. This ballast control IC provides all of the necessary features to implement wide range dimming control, soft start and constant power consumption for intelligent electronic ballast systems. The KA7543 is optimized for advanced electronic ballast systems requiring minimum board area. 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. Protection circuitry, no lamp protection, abnormal protection, one lamp detection, UVLO, restart on lamp adding , have been added.
14-DIP
Applications
* Electronic Ballast * Lighting Control System * Half Bridge Drive Control System
1
14-SOP
1
Rev. 1.0.3
(c)2002 Fairchild Semiconductor Corporation
KA7543
Internal Block Diagram
Output stage
OUT1
1
14
OUT2
Frequency divider
Protection reset +
NC
2 Reset Cs UVLO 9.5V + sw 2V Vref (bandgap) 2V Internal bias bias 7V 1.8V 7V Vz Supply Q Q + + 2V + R S + 4V Limiter -
0.7V -
13
NC
ict 55pF 8ict 12
Vcc
3
GND
sw Oscillator + 1V
Cc
4 5.7V Dimming starter 4V + 2V 5V regulator +
11
Cdm
11A 5.7V Mirror + isr 5V Switch + id 1/2 Mirror idr + + is-id Selecter 20k + 3V + 1V 5pF 8 Dimmer 2V 9 20k Gm + Soft starter 2V 10
V5
5 5/2 is
Cs
Current amp +
Vfb
6 Vr 5k
Gm + ir
Vdm
30k
Vab
7 3pF
+ S 2V Abnormal protection R Q Q
Vld
No-lamp pretection
2
KA7543
Pin Assignments
OUT2
NC
GND
Cdm
Cs
Vdm
Vld
KA7543
OUT1
NC
Vcc
Cc
V5
Vfb
Vab
Pin Definitions
Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin Name OUT1 NC Vcc Cc V5 Vfb Vab Vld Vdm Cs Cdm GND NC OUT2 Drive Output 1 No Connection Supply Voltage Input Compensation Input 5V Voltage Source Negative Feedback Input Abnormal Protection Input Lamp Detection Input Dimming Control Input Soft Start Time Control Input Soft Dimming Control Input Ground No Connection Drive Output 2 Pin Function Description
3
KA7543
Absolute Maximum Ratings
Parameter Supply Voltage Peak Drive Output Current Drive Output Clamping Diodes VO > VCC, or VO < -0.3 Operating Temperature Range Storage Temperature Range Power Dissipation Thermal Resistance (Junction-to-Air) Symbol VCC IOH, IOL Iclamp Topr Tstg Pd ja Value 30 300 10 -25 to 125 -65 to 150 1 123 Unit V mA mA C C W C/W
Absolute Maximum Ratings (-25CTa125C) -
Parameter Temperature Stability For Reference Voltage (Vref) Temperature Stability For Operating Frequency (fs) Symbol Vref(Typ) fs(Typ) Value 20 8 Unit mV kHz
Electrical Characteristics
Unless otherwise specified, Vcc=12V, Ta=25C. Parameter UNDER VOLTAGE LOCK OUT SECTION Start Threshold Voltage UVLO Hysteresis 5V Reference Voltage(Note1) SUPPLY CURRENT SECTION Start Up Supply Current Operating Supply Current Dynamic Operating Supply Current (Note1) CURRENT AMPLIFIER SECTION (NOTE1) Output Sink Current Output Source Current Iea(i) Iea(o) Vfb = 2V Vfb = 0V 12 12 15 15 18 18 A A IST ICC IDCC Vcc=8.5V Output not switching fo = 50kHz, CI=1nF 0.2 7 8 0.27 9 12 mA mA mA VTH(st) HY(st) V5 I5 = 0mA VCC increasing 8.7 1.5 4.9 9.5 1.8 5 10.3 2.1 5.1 V V V Symbol Conditions Min. Typ. Max. Unit
4
KA7543
Electrical Characteristics (Continue)
Unless otherwise specified, Vcc=12V, Ta=25C. Parameter 1 Lamp Feedback Voltage 2 Lamp Feedback Voltage Output Voltage High Output Voltage Low OSCILLATOR SECTION(NOTE1) Reference Frequency Reference Dead Time Soft Start Frequency Soft Start Time Current Dimming Voltage Range Dimming Start Voltage Initial Dimming Output Voltage OUTPUT 1/2 SECTION Rising Time (Note2) Falling Time(Note2) Output Voltage With UVLO Activated PROTECTION SECTION Lamp Detection Voltage Abnormal Detection Voltage Switch Off Detection Voltage No Lamp Detect Voltage PROTECTION RESET SECTION Protection Reset Voltage Vpr 0.7 V Vld Vab Vso Vnd 2.5 1.6 4.7 0.85 3 2 5 1 3.5 2.4 5.3 1.15 V V V V tr tf Vomin(o) Vcc =12V,CI =1nF Vcc =12V,CI =1nF VCC = 5V, IO =100A 200 50 280 90 0.9 ns ns V fref td fss Iss Vdm Vdm Vdm Vdm = 0V Vdm = 0V VC = 3.0V VC = 3.0V VC = 0V VC = 0V 37 1.2 77 9.2 0 3.85 -0.1 45 1.4 11 4 0 53 1.6 12.8 2 4.15 0.1 kHz s kHz A V V V Symbol Vfb1 Vfb2 Vea(h) Vea(l) Vld = 2V Vld = 4V Vfb = 0V Vfb = 2V Conditions Min. 0.425 0.85 5.5 Typ. 0.5 1 5.7 Max. 0.575 1.15 5.9 0.4 Unit V V V V
VOLTAGE INPUT DIMMING SECTION(NOTE1)
Notes : 1. This parameter should be tested in Vcc = 11V, 14V, 30V. 2. This parameter, although guaranteed, is not tested in production.
5
KA7543
Operating Description
lamp feedback
lamp change
soft moving on dimming Vcs 2Lamp
2V 1V 0.5V 2V Vdm 1V 0 Vfb
1Lamp
t[sec]
Figure 1. Operation Characteristics
The KA7543 is an advanced, lamp current feedback ballast dimming control IC which drives half bridge converter. This control IC provides all the necessary features to implement wide range dimming control, soft-start and constant power consumption for the intelligent electronic ballast system. The number of external components can be minimized by adopting the 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. When the Cs pin voltage, Vcs is over 2V, the soft start operation ends. During the soft start operation, the reference voltage which controls the lamp current is proportional to Vcs. Dimming operation starts when Vcs becomes 4V and the change rate of dimming is determined by the capacitor connected to the Cdm pin. The more smooth dimming can be accomplished by the larger capacitor connected to the Cdm pin.
UVLO(Under Voltage Lock Out)
To output Reset Cs UVLO 9.5V + sw 2V Vref (bandgap) 2V Internal bias bias 7V 1.8V 7V Vz Supply
Vcc
3
Figure 2. UVLO
Until the Vcc voltage reaches the start-up threshold voltage(9.5V), UVLO circuit lowers the IC operating current below 270A. When the Vcc voltage reaches the start-up threshold voltage, it generates IC reference voltage(Vref) and supplies bias current for the whole circuitry. The hysteresis of UVLO circuit is 1.8V.
6
KA7543
Soft Start
Cc
4 Dimming starter 4V + 11A 5.7V Mirror is isr + Gm + 20k Soft starter 2V 10
Cs
Figure 3. Soft Start
The soft start circuit charges the soft start capacitor, Cs connected to Cs pin. So the Cs pin voltage increases linearly when start-up and the current(is) makes the reference voltage(Vr) which is proportional to is current. The is current is maximum when the Cs pin voltage is 2V. The highest soft start frequency is determined by the Cc pin voltage(Vbe+2Vd). The operating frequency linearly decreases until the Cs pin voltage reaches 2V. During the soft start operation, the reference voltage which controls the lamp current is proportional to Vcs. If the Cs pin voltage is higher than 2V, the operating frequency is controlled by the feedback reference voltage. The UN-UVLO signal discharges capacitor Cs when the Vcc voltage is lower than UV.
Oscillator
From Cc + + 2V + To flip flop Q Q R S + 4V sw + 1V 8ict 55pF Limiter ict
-
Oscillator
Figure 4. Oscillator
The oscillator block consists of two comparators and the ratio of charging time and discharging time is 7:1. The current source, ict charges 55pF capacitor until the capacitor voltage meets the upper limit voltage. After that time, 7*ict current discharges the capacitor until it meet the lower limit voltage, 1V. The upper limit voltage is between 2V and 4V. The operating frequency is highest when the upper limit voltage is 2V and it is lowest when the upper limit voltage is 4V. The lowest operating frequency guarantees the zero voltage switching operation of the ballast system.
7
KA7543
Dimming Control Stage
11 5V Switch is + id To error amp (+) is-id 20k Mirror idr To output + + + Dimmer 2V 9
Cdm
CURRENT AMPLIFIER
Vdm
DIMMING CONTROL
Figure 5. Dimming Control Stage
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. The more smooth dimming can be accomplished by the larger capacitor connected to the Cdm pin. If the Vdm pin voltage is higher than 5V, then the output drive stage remains in off state. Dimming control and output drive on/ off control can be achieved with only one pin.
Output Drive Stage
From protection output from uvlo
1
OUT1
From oscillator Q
Frequency divider
Output stage
14
OUT2
Figure 6. Output Drive Stage
OUT1 and OUT2 are complementary and there is 1.4us dead time for the ZVS operation. The structure of output stage is the totem-pole output stage. For the high side MOSFET drive, a pulse transformer is necessary.
No Lamp Protection
If the Vld pin voltage is lower than 1V, it means that there is no lamp connected. On no lamp condition, the output drive stage is in off state.
8
KA7543
Abnormal Protection
30k
To output + S 2V R Q From no lamp Q Protection reset + 0.7V
Vab
7 3pF
Abnormal protection
Vct
Figure 7. Abnormal Protection Circuit
The abnormal protection is similar to the over current protection, but it is a protection that detects abnormal connection of lamps. The abnormal protection circuit works when the Vab pin voltage is higher than 2V. The abnormal protection is latched using a flip-flop and the protection is reset when the ballast system restarts.
Lamp Selector Stage
Cc
Vfb
6 Vr 5k
Gm + 1/2 ir is-id Selecter + 3V + 1V 5pF 30k 8
Vld
No-lamp pretection
Figure 8. Lamp Selector Stage
If the Vld pin voltage is between 1V and 3V, it means that there is one lamp connected and if the Vld pin voltage is over 3V, it is two lamps condition. The feedback reference voltage of the two lamps condition is twice that of one lamp condition.
9
KA7543
Application Circuit
<85 ~ 265VAC Input, 400VDC, Fluorescent Lamps Ballast(32W*2 / 36W*2)>
T1 D5 D3 D4 C5 R3 D1 NTC R1 C3 C4 C6 C2 L1 C1
1 INV
R4 R7 D8 R5 Q1
D2
C9
8 7 6 OUT GND MULT Vcc 5 CS Idet
FAN7527B
EA_OUT
R8 R6 R9
2
3
TNR F1 R2 C8 AC INPUT C7
4
R15 C17
C22C23C13
12 7 10 11 14 4 1
C19
C10 R12 T2
Q2
R14 L2 C14 L3
C15
KA7543 C11 R11 R10 C12 R21 C24 ZD1 Vdm(0~2V)
6 3 5 9 14 8 14
R13
Q3 D6 D7 C16 R16
C18
C20
R17
R18
C21
R19
10
KA7543
Components List (32W*2Lamp Application)
Part Number R1 R2 R3, 21 R4, 11 R5 R6 R7 R8 R9 R10 R12, 13 R14 R15, 16 R17, 18 R19 C1, 2 C3, 4 C5 C6, 24 C7 C8, 11 C9 C10 C12, 21 C13 C14 C15,16 C17, 18, 19, 20 C22, 23 Q1, 2, 3 D1, 2, 3, 4 D5 D6, 7 D8 ZD1 L1 L2, 3 T1 T2 F1 TNR NTC Value 1.8M 25k 150k 22k 10 0.68 1.0M 6k 103 6.8 47 180k 330k 680k 8.2k 150nF, 275Vac 2200pF, 3000V 0.33F, 630V 47F, 35V 1F 1nF, 25V 47F, 450V 0.22F, 25V 0.1F, 25V 10nF, 25V 1nF, 630V 4700pF, 1000V 6800pF, 630V 22F, 35V 500V, 4.5A 1000V, 1A 600V, 1A 600V, 1A 75V, 150mA 15V, 1W 45mH 3.1mH(120T) 0.9mH(80T:6T) 1.2mH(30T:60T) 250V, 3A 470V 10 Note 1/4W 1/4W 1W 1/4W 1/4W 1W 1/4W 1/4W Variable resistor 1W 1W 1/4W 1/4W 1/4W 1/4W Box-Cap Y-Cap Miller-Cap Electorlytic MLCC Ceramic Electorlytic Ceramic Ceramic Ceramic Miller-Cap Miller-Cap Miller-Cap Electorlytic IRFS830B 1N4007 BYV26C 1N4937 1N4148 1N4744 Line Filter EI2820 EI2820 EE1614 Fuse 471 10D09 Fairchild 11 Manufacturer -
KA7543
Components List(36W*2Lamp Application) (Continued)
Part Number R1 R2 R3, 21 R4, 11 R5 R6 R7 R8 R9 R10 R12, 13 R14 R15, 16 R17, 18 R19 C1, 2 C3, 4 C5 C6, 24 C7 C8, 11 C9 C10 C12, 21 C13 C14 C15,16 C17, 18, 19, 20 C22, 23 Q1, 2, 3 D1, 2, 3, 4 D5 D6, 7 D8 ZD1 L1 L2, 3 T1 T2 F1 TNR NTC 12 Value 1.8M 22k 150k 22k 10 0.68 1M 6k 103 6.8 47 180k 330k 680k 8.2k 150nF, 275Vac 2200pF, 3000V 0.33F, 630V 47F, 35V 1F 1nF, 25V 47F, 450V 0.22F, 25V 0.1F, 25V 10nF, 25V 1nF, 630V 3300pF, 1000V 6800pF, 630V 22F, 35V 500V, 4.5A 1000V, 1A 600V, 1A 600V, 1A 75V, 150mA 15V, 1W 45mH 3.1mH(120T) 0.9mH(80T:6T) 1.2mH(30T:60T) 250V, 3A 470V 10 Note 1/4W 1/4W 1W 1/4W 1/4W 1W 1/4W 1/4W Variable resistor 1W 1W 1/4W 1/4W 1/4W 1/4W Box-Cap Y-Cap Miller-Cap Electorlytic MLCC Ceramic Electorlytic Ceramic Ceramic Ceramic Miller-Cap Miller-Cap Miller-Cap Electorlytic IRFS830B 1N4007 BYV26C 1N4937 1N4148 1N4744 Line Filter EI2820 EI2820 EE1614 Fuse 471 10D09 Fairchild Manufacturer -
KA7543
Mechanical Dimensions
Package Dimensions in millimeters
14-DIP
6.40 0.20 0.252 0.008
19.80 MAX 0.780
19.40 0.20 0.764 0.008
#7
#8
7.62 0.300
3.25 0.20 0.128 0.008
0.20 0.008 MIN
5.08 MAX 0.200
3.30 0.30 0.130 0.012
0.25 -0.05
+0.10
0~15
0.010 -0.002
+0.004
2.54 0.100
0.46 0.10 0.018 0.004
1.50 0.10 0.059 0.004
#1
#14
(
2.08 ) 0.082
13
KA7543
Mechanical Dimensions (Continued)
Package Dimensions in millimeters
14-SOP
MIN 1.55 0.10 0.061 0.004 0.05 0.002
#1
#14
8.70 MAX 0.343
8.56 0.20 0.337 0.008
#7 6.00 0.30 0.236 0.012
#8
1.80 MAX 0.071
+0.10 0.20 -0.05 +0.004 0.008 -0.002
3.95 0.20 0.156 0.008
0.60 0.20 0.024 0.008
5.72 0.225
14
0~ 8
MAX0.10 MAX0.004
1.27 0.050
+0.10 0.406 -0.05 +0.004 0.016 -0.002
(
0.47 ) 0.019
KA7543
Ordering Information
Product Number KA7543 KA7543D Package 14-DIP 14-SOP Operating Temperature -25C ~ +125C
15
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. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.
www.fairchildsemi.com 8/2/02 0.0m 001 Stock#DSxxxxxxxx 2002 Fairchild Semiconductor Corporation
2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

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