Fairchild FAN7544MX Simple ballast controller Datasheet

www.fairchildsemi.com
FAN7544
Simple Ballast Controller
Features
Descriptions
•
•
•
•
•
•
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The FAN7544 provides simple and high performance electronic ballast control functions. The FAN7544 is optimized
for electronic ballast requiring a minimum board area, by
reducing component counts and lowering power dissipation.
The features include programmable preheating time and frequency and programmable run frequency. The initial preheating time and frequency can be adjusted according to the
types of lamps using the CPH, CT and RPH. Output gate
driver circuit clamps power MOSFET gate voltage to the
supply voltage.
Low Start-up and Operating Current : 140µA, 6.5mA
Under Voltage Lock Out With 1.9V of Hysteresis
600mA of Totem Pole Output with High State Clamp
Trimmed 1.5% Internal Bandgap Reference
Programmable Preheat Time & Frequency
Programmable Run Frequency
High Accuracy Oscillator
8-DIP
8-SOP
1
1
Internal Block Diagram
5V
9V Vsup
Bias
Current
CPH 4
1.6µA
10µA
1
2.1
2.9V
Vz
5V
CT 2
Ict
Oscillator
Current
Source
Irt=Vref/Rt
RPH 1
Current
Source
Iph=Vref/Rph
−
Shutdown signal
VCPH
7
OUT1
6
OUT2
5
GND
Vcc
Frequency
Divider
Vcc
Latch
3
2V
S Q
R Q
Irt
S
1.5V
+
Vcc
R Q
5.2V
6.25Ict
RT
8
11.6V
Iph - Irt
2.9V
UVLO
1.9V
+
−
5V
TSD
Rev. 1.0.0
©2004 Fairchild Semiconductor Corporation
FAN7544
Pin Assignments
CT 2
Y W W
RT 3
CPH 4
FAN7544
RPH 1
8
VCC
7
OUT1
6
OUT2
5
GND
YWW : Work Week Code
Pin Definitions
2
Pin Number
Pin Name
1
RPH
2
CT
Pin Function Description
Preheat frequency set resistor
Oscillator frequency set capacitor
3
RT
4
CPH
Preheat time set capacitor
Oscillator frequency set resistor
5
GND
Ground
6
OUT2
Gate drive output 2
7
OUT1
Gate drive output 1
8
VCC
Supply voltage
FAN7544
Absolute Maximum Ratings
Parameter
Symbol
Value
Unit
VCC
30
V
IOH, IOL
±600
mA
Iclamp
±10
mA
CPH, CT, RT, and RPH Pins Input Voltage
VIN
-0.3 to 6
V
Operating Temperature Range
Topr
-25 to 125
°C
Storage Temperature Range
Tstg
-65 to 150
°C
Supply Voltage
Peak Drive Output Current
Output Drive Clamping Diode Current
Power Dissipation
Thermal Resistance (Junction-to-Air)
8-DIP
8-SOP
8-DIP
8-SOP
Pd
Rθja
0.8
0.5
100
165
W
°C/W
Temperature Characteristics (-25°C ≤ Ta ≤ 125°C)
Parameter
Symbol
Value
Unit
Temperature Stability for Operating Frequency (fos)
∆fos(Typ)
3
%
3
FAN7544
Electrical Characteristics
Unless otherwise specified, for typical values Vcc=15V, Ta=25°C, For Min/Max values Ta is the operating ambient
temperature range with -25°C ≤ Ta ≤ 125°C and 12.7V ≤ VCC ≤ 30V
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
UNDER VOLTAGE LOCK OUT SECTION
Start Threshold Voltage
VTH(st)
VCC Increasing
10.5
11.6
12.7
V
UVLO Hysteresis
HY(st)
-
1.4
1.9
2.4
V
-
0.14
0.2
mA
SUPPLY CURRENT SECTION
Start Up Supply Current
IST
VCC < VTH(st)
ICC
Output not switching
-
6.5
10
mA
IDCC
50kHz, CL =1nF
-
8
12
mA
CPH Pin Charging Current 1
ICPHL
VCPH=2V
1.3
1.6
1.9
µA
CPH Pin Charging Current 2
ICPHH
VCPH=4V
7
10
13
µA
-
4.8
5.6
6.4
V
70
81.5
93
kHz
Operating Supply Current
Dynamic Operating Supply Current
OSCILLATOR SECTION
CPH Pin Clamp Voltage
VCLAMP
Preheating Frequency
fPH
VCPH=0V,
RPH=47kΩ, CT=470pF
Preheating Dead Time
tpd
VCPH=0V,
RPH=47kΩ, CT=470pF
0.8
1.3
1.8
µs
Operating Frequency
fOS
VCPH=Open,
RT=80kΩ, CT=470pF
45.5
50
54.5
kHz
Operating Dead Time
tOD
VCPH=Open,
RT=80kΩ, CT=470pF
1.6
2.0
2.4
µs
CT Threshold Voltage(note1)
∆VCT
Ta=25°C
3.2
3.7
4.2
V
CT Charging Current
ICHG
-
170
220
270
µA
CT Discharging Current
IDIS
-
Temperature Stability (Note1)
∆f/∆T
-25°C ≤ Ta ≤ 125°C,
VCC = 25V
Voltage Stability
∆f/∆V
12.7V ≤ VCC ≤ 30V, Ta=25°C
0.9
1.15
1.4
mA
-
1
3
%
-
-
3
%
OUTPUT SECTION
Gate Driver Source Current(note1)
Gate Driver Sink Current(note1)
IOSOURCE VOUT=0V
IOSINK
-
500
-
mA
VOUT=14.6V
-
500
-
mA
Rising Time (Note1)
tr
CL=1nF, Vcc=15V, Ta=25°C
-
130
170
ns
(Note1)
tf
CL=1nF, Vcc=15V, Ta=25°C
-
50
100
ns
13
15
17
V
Falling Time
Maximum Output Voltage
Vomax
VCC = 25V
Output Voltage With UVLO Activated
Vomin
VCC = 5V, IO = 100µA
-
-
1
V
ISD
RPH=47kΩ
-
0.6
-
mA
ILATCH
VCC = 15V
-
0.36
0.57
mA
-
150
-
°C
PROTECTION SECTION
Shutdown Sink Current(note1)
Latch Mode Quiescent Current
Thermal Shutdown Junction
Temperature (Note1)
TSD
-
Note:
1. These parameters, although guaranteed, are not 100% tested in production.
4
FAN7544
Typical Characteristics
0.008
10
0.007
0.006
idcc @VCC=30V
idcc @VCC=15V
idcc @VCC=12.5V
9
0.005
Current [mA]
8
Idcc[A]
0.004
0.003
0.002
7
6
0.001
5
0.000
-0.001
0
5
10
15
20
25
4
30
-60
-40
-20
0
Vcc[V]
20
40
60
Figure 1. UVLO
100
120
140
Figure 2. Dynamic Operating Current
9
14.0
UV+
UV-
13.5
13.0
icc @VCC=30V
icc @VCC=15V
iccl @VCC=12.5V
8
12.5
12.0
11.5
Current [mA]
Voltage [V]
80
Temperature [°C]
11.0
10.5
10.0
9.5
7
6
5
9.0
8.5
4
8.0
7.5
3
7.0
-60
-40
-20
0
20
40
60
80
100
120
140
-40
-20
0
20
40
60
80
100
120
140
Figure 4. Operating Current
Figure 3. UVLO Hysteresis
53
-60
Temperature [°C]
Temperature [°C]
Rt=80kΩ, Ct=470p
52
fosc [kHz]
51
50
49
48
47
-60
-40
-20
0
20
40
60
80
100
120
140
Temperature [°C]
Figure 5. Switching Frequency
5
FAN7544
Typical Characteristics(Con’t)
80
CT=470pF
Vcc=15V
Ta=25°C
120
110
CT=470pF
Vcc=15V
Ta=25°C
75
Fosc [kHz]
Fosc[kHz]
70
100
90
65
60
55
80
50
70
45
30
35
40
45
50
55
50
60
70
Rph [kΩ]
80
90
Rt [kΩ]
Figure 6. Preheating Frequency, CT=470pF
Figure 7. Switching Frequency, CT=470pF
100
130
CT=1nF
Vcc=15V
Ta=25°C
120
80
Fosc[kHz]
Fosc[kHz]
110
100
90
80
70
60
50
70
40
60
10
15
20
25
Rph [kΩ]
Figure 8. Preheating Frequency, CT=1nF
6
CT=1nF
Vcc=15V
Ta=25°C
90
30
20
25
30
35
40
45
Rt [kΩ]
Figure 9. Switching Frequency, CT=1nF
50
FAN7544
Application Information
Start-up Circuit
The start-up current is supplied to the IC through the start up resistor (Rst). In order to reduce the power dissipation in Rst, the
Rst is connected to the full wave rectified output voltage.
The following equations can be used to calculate the size of Rst
Vin ( ac ) × 2 – Vth ( st ) ,max
Rst < --------------------------------------------------------------------------Ist ,max
85 × 2 – 12.5- = 539k Ω
= ------------------------------------–3
0.2 × 10
2
( Vin ( ac_max ) ⋅ 2 – Vcc )
P RSt = ------------------------------------------------------------------------ ≤ 0.5W
R St
R St ≥ 2 × ( Vin ( ac_max ) ⋅ 2 – Vcc )
∴260K ≤ R St ≤ 539K
2
R St ≥ 260K
The size of supply capacitor (Cs) is normally decided in
terms of the start up time and operating current built up
by auxiliary operating current source.
The turn off snubber capacitor (CQ) and two diodes
(D1, D2) constitute the auxiliary operating current
source for the IC. The charging current through the CQ
flows into the IC and also charges the supply capacitor.
If the size of CQ is increased, the VCC voltage on the
Cs is also increased.
DC 400V
Rectifier
Output
M1
Rst
D2
CQ
Vcc
Cs
ZD1
Under Voltage Lock Out(UVLO)
UVLO mode of the FAN7544 is designed to maintain
an ultra low supply current of less than 140uA, and to
guarantee that the IC is fully functional before two output drivers are activated.
G1
D1
G2
M2
Figure 10. Start-up Circuit
Oscillator
The gate drive output frequency is as half as that of the triangular waveform on timing capacitor (CT) at pin #2. In normal
operating mode, the timing capacitor charging current is 4×Irt(=Vref/RT). The discharging current is 5.25 times of the charging current (5.25×4×Ιrt). The charging period of the timing capacitor is the on time of the MOSFET. During the discharging
period, both of the MOSFETs are off.
Charging
Period(∆TCH)
Discharging
Period(∆TDIS)
ICH
IDIS=6.25*ICH
Vref
ICH
VCT
3.7V
CT
IDIS
OUT1
OUT2
Dead Time
Figure 11. CT & Output Waveforms
7
FAN7544
Operating Mode
Vcc
0V < VCPH < 2.9V
Vth(st)
iCT = I RT +
t
VCPH
ICPHH=10µA
ICPHL=1.6µA
2.9V ≤ VCPH < 5V
5V
iCT = I RT +
2.9V
t
VCPH ≥ 5V
f
fpre
fpre
;Preheating Frequency
I PH − I RT
( 5V − 2.9V )
( 5V − 2.9V ) = I PH
; Frequency Sweep
I PH − I RT
( 5V − VCPH )
( 5V − 2.9V )
; Run Frequency
iCT = I RT
fign
frun
frun
t
preheating
tph
ignition
tsw
run
Figure 12. Timing Diagram
The FAN7544 has three operating mode as was shown in the figure 12.
1) Preheating Mode
The preheating mode is defined as the IC’s internal status is in when the lamp filaments are being heated to correct emission
temperature. This is necessary for maximizing lamp life and reducing the required ignition voltage. As soon as the Vcc
exceeds the UVLO high threshold , the preheating time set-up capacitor, CPH starts to be charged by the internal 1.6µA current source until the VCPH reaches 2.9V. From 0V to 2.9V of the VCPH after the VCPH start to be charged, the switching frequency throughout the preheating mode is determined by CT and RPH and the preheating time is decided by the CPH and the
1.6µA current source. (∆TPRE=CPH×2.9V/1.6µA)
2) Ignition mode
The ignition mode is defined as the IC’s internal status is in when a high voltage is established across the lamp necessary for
igniting the lamp. When the VCPH exceeds 2.9V, the FAN7544 enters the ignition mode, and moves to the run mode when the
VCPH exceeds 5V. In this period, the internal 10µA current source charges the external preheating timing capacitor(CPH) in
order to increase noise immunity with sharp slop of the VCPH. The ignition time is decided CPH and internal 10µA current
source(∆TIGN=CPH×∆VCPH2/ICPHH). In this mode, the switching frequency is determined by CT, RPH and RT because the
ICT is decided by the following equation.
ICT = I RT +
I RPH − I RT
( 5V − VCPH )
2.1
3) Run Mode
After the lamp has successfully ignited, the FAN7544 enters run mode. The run mode is defined as the IC’s internal status is in
when the lamp is being driven with a normal power level after the lamp is discharged. The run mode switching frequency is
determined by the timing resistor RT and timing capacitor CT. As soon as the VCPH exceeds 5V, the protection masking mode
is disable and the IC can enter the protection mode.
Protection Mode
If the voltage at the RPH pin decreases below 2V during the run mode, the FAN7544 enters the protection mode and all gate
drive outputs(OUT1 & OUT2) are latched off in the low state and the VCPH is decreased to 0V. To exit the protection mode,
the Vcc must go down below the UVLO low threshold.
8
FAN7544
Application Circuit
<32W×2 Lamps Ballast>
D4
L1
1
DC_400V
5
D1
4
D12
D13
D10
D11
3
1
C1
R1
R13
R8
R4
1
R2
D3
R5
M1
NTC
R12
1
8
7
OUT
CX2
6
5
C2
Idet
C4
C3
R6
GND
CY2
Vcc
CY1
R9
D2
R11
CX1
R3
1
2
3
R7
4
1
1
TNR
R10
CS
INV
C5
MULT
EA_OUT
FAN7527B
LF1
VR1
C6
1
1
F1
R14
1
1
2
2
AC INPUT
DC_400V
C100//C101
M50
R53
C53
1
5
R104,
R105
L100
R106
ZD51
6
R50
T1
R54
8
1
C102
2
M51
C54
1
R51
C52
R55
DC_400V
R200,
R201
D200
2
GND
OUT2
5
2
CT
CPH
RT
3
RT
ZD52
4
C203
2
CPH
2
C57
R58
R59
C56
R60
R202
R100,
R101
D100
C55
RPH
2
Q50
R57
1
CT
C51
C50
ZD50
RPH
FAN7544
ZD53
2
R203
OUT1
Vcc
6
C58
D201
C202
7
C200//C201
2
D50
R206
5
D51
R56
2
R204,
R205
2
L200
R52
8
D101
3
2
Ignition Fail
Detection Circuit
R102
C103
Open Lamp
Detection Circuit
Q51
R103
2
9
FAN7544
Components List (for Wide-Range 32W× 2Lamps Application)
Part number
INPUT PART
Value
Note
Manufacturer
250V, 3A
Fuse
-
CX1
47nF, 275Vac
Box-Cap
-
CX2
150nF, 275Vac
Box-Cap
-
CY1, CY2
2200pF, 3000V
Y-Cap
-
TNR
NTC
470V
10Ω
471
10D09
-
D10, D11, D12, D13
400V, 1A
1N4004
Fairchild
R1, R2, R8
910kΩ
Ceriamic, 1206
-
R3
R4
22kΩ
25.5kΩ
Ceriamic, 1206
Ceriamic, 1206
-
R5
10Ω
Ceriamic, 1206
-
R6
R7
22kΩ
0.47Ω
Ceriamic, 1206
1W
-
R9
R10
100kΩ
2.2kΩ
Ceriamic, 1206
Ceriamic, 1206
-
R11
R12
220kΩ
150kΩ
1W
1W
-
R13
R14
4.7Ω
0Ω
Ceriamic, 1206
Ceriamic, 1206
VR1
C1
10kΩ
0.22µF, 630V
Variable Resistor
Miller-Cap
-
C2
C3
47µF, 450V
10µF, 50V
Electrolytic
Electrolytic
-
C4
C5
105
102
Ceramic, 0805
Ceramic, 0805
-
C6
L1
105
0.9mH(80T:6T)
Ceramic, 0805
EI2820
-
D1, D4
D2
600V, 1A, Ultrafast
Schottky Diode
UF4005
MBR0540
Fairchild
Fairchild
D3
M1
Small Signal Diode
500V, 5A, Power Mosfet
FDLL4148
FQP5N50C, FQPF5N50C
Fairchild
Fairchild
R50
R51, R53
390kΩ
39Ω
1W
Ceriamic, 1206
-
R52, R57, R60
R54, R55
0Ω
47kΩ
Ceriamic, 1206
Ceriamic, 1206
-
R56
R58, R59
5.6Ω
62kΩ
1W
Ceriamic, 0805
-
RPH
RT
51kΩ
82kΩ
Ceriamic, 1206
Ceriamic, 1206
-
R100, R104, R200, R204
R101, R105, R201, R205
820kΩ
300kΩ
Ceriamic, 1206
Ceriamic, 1206
-
F1
PFC PART
Ballast PART
10
FAN7544
Part number
Value
Note
Manufacturer
R102, R202
5.1kΩ
Ceriamic, 1206
-
R103, R203
50kΩ
Ceriamic, 1206
-
R106, R206
30kΩ
Ceriamic, 1206
C50
4.7µF, 50V
Electrolytic
-
C51
C52, C53
105
104
Ceriamic, 0805
Ceramic, 1206
-
C54
1nF, 630V
Miller-Cap
-
C55, C56, C57, C58
104
Ceramic, 0805
-
CT
471
Ceramic, 0805
-
CPH
474
Ceramic, 0805
-
C100, C101, C200, C201
C102, C202
6.8nF, 630V
4.7nF, 1000V
Miller-Cap
Miller-Cap
-
L100, L200
3.2mH(120T)
4mH(50T:50T)
EE2820
-
T1
Q50
M50, M51
4mH(50T:100T)
EE1614
C53: 0Ω, ZD51 : Open
NPN transistor
500V, 5A, Power Mosfet
KST2222A
FQP5N500C, FQPF5N50C
Fairchild
Fairchild
D50, D51, D100, D101,
D200, D201
ZD50, ZD51
Small Signal Diode
FDLL4148
Fairchild
15V, 1W Zener Diode
1N4744A
Fairchild
ZD52, ZD53
15V, Zener Diode
MMSZ5245B
Fairchild
11
FAN7544
Mechanical Dimensions
Package
Dimensions in millimeters/inches
8-SOP-225
12
FAN7544
Mechanical Dimensions (Continued)
Package
Dimensions in millimeters/inches
8-DIP-300
13
FAN7544
Ordering Information
Product Number
Package
FAN7544N
8DIP
FAN7544M
8SOP
FAN7544MX
8SOP
Operating Temperature
-25°C ~ +125°C
Packing
Tube
Tape & Reel
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.
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.
www.fairchildsemi.com
9/21/04 0.0m 001
Stock#DSxxxxxxxx
 2004 Fairchild Semiconductor Corporation
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