www.fairchildsemi.com
FAN7544
Features
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Simple Ballast Controller
Descriptions
The FAN7544 provides simple and high performance elec-
tronic 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 fre-
quency and programmable run frequency. The initial pre-
heating 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
1
2.1
Iph - Irt
UVLO
1.9V
8
C
PH
4
Vcc
2.9V
11.6V
S Q
R Q
Vcc
1.6µA
10µA
Vz
2.9V
C
T
2
5V
Ict
Irt
7
OUT1
5.2V
6.25Ict
R Q
Oscillator
S
Latch
Irt=Vref/Rt
6
Frequency
Divider
Vcc
1.5V
R
T
3
Current
Source
Current
Source
OUT2
R
PH
1
+
2V
Iph=Vref/Rph
Shutdown signal
5
−
GND
V
CPH
5V
−
+
TSD
Rev. 1.0.0
©2004 Fairchild Semiconductor Corporation
FAN7544
Pin Assignments
RPH
1
CT
2
RT
3
CPH
4
Y W W
8
VCC
OUT1
OUT2
GND
YWW : Work Week Code
FAN7544
7
6
5
Pin Definitions
Pin Number
1
2
3
4
5
6
7
8
Pin Name
RPH
C
T
RT
CPH
GND
OUT2
OUT1
V
CC
Pin Function Description
Preheat frequency set resistor
Oscillator frequency set capacitor
Oscillator frequency set resistor
Preheat time set capacitor
Ground
Gate drive output 2
Gate drive output 1
Supply voltage
2
FAN7544
Absolute Maximum Ratings
Parameter
Supply Voltage
Peak Drive Output Current
Output Drive Clamping Diode Current
CPH, CT, RT, and RPH Pins Input Voltage
Operating Temperature Range
Storage Temperature Range
Power Dissipation
Thermal Resistance (Junction-to-Air)
8-DIP
8-SOP
8-DIP
8-SOP
Symbol
V
CC
I
OH
, I
OL
Iclamp
V
IN
Topr
Tstg
Pd
Rθja
Value
30
±600
±10
-0.3 to 6
-25 to 125
-65 to 150
0.8
0.5
100
165
Unit
V
mA
mA
V
°C
°C
W
°C/W
Temperature Characteristics (-25°C
≤
Ta
≤
125°C)
Parameter
Temperature Stability for Operating Frequency (fos)
Symbol
∆fos(Typ)
Value
3
Unit
%
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
≤
V
CC
≤
30V
Parameter
Start Threshold Voltage
UVLO Hysteresis
SUPPLY CURRENT SECTION
Start Up Supply Current
Operating Supply Current
Dynamic Operating Supply Current
OSCILLATOR SECTION
CPH Pin Charging Current 1
CPH Pin Charging Current 2
CPH Pin Clamp Voltage
Preheating Frequency
Preheating Dead Time
Operating Frequency
Operating Dead Time
CT Threshold Voltage
(note1)
CT Charging Current
CT Discharging Current
Temperature Stability
(Note1)
Voltage Stability
OUTPUT SECTION
Gate Driver Source Current
(note1)
Gate Driver Sink Current
(note1)
Rising Time
(Note1)
Falling Time
(Note1)
Maximum Output Voltage
Output Voltage With UVLO Activated
PROTECTION SECTION
Shutdown Sink Current
(note1)
Latch Mode Quiescent Current
Thermal Shutdown Junction
Temperature
(Note1)
I
SD
I
LATCH
T
SD
RPH=47kΩ
V
CC
= 15V
-
-
-
-
0.6
0.36
150
-
0.57
-
mA
mA
°C
I
OSOURCE
V
OUT
=0V
I
OSINK
tr
tf
V
omax
V
omin
V
OUT
=14.6V
C
L
=1nF, Vcc=15V, Ta=25°C
C
L
=1nF, Vcc=15V, Ta=25°C
V
CC
= 25V
V
CC
= 5V, I
O
= 100µA
-
-
-
-
13
-
500
500
130
50
15
-
-
-
170
100
17
1
mA
mA
ns
ns
V
V
I
CPHL
I
CPHH
V
CLAMP
f
PH
tpd
f
OS
t
OD
∆V
CT
I
CHG
I
DIS
∆f/∆T
∆f/∆V
V
CPH
=2V
V
CPH
=4V
-
V
CPH
=0V,
RPH=47kΩ, CT=470pF
V
CPH
=0V,
RPH=47kΩ, CT=470pF
V
CPH
=Open,
RT=80kΩ, CT=470pF
V
CPH
=Open,
RT=80kΩ, CT=470pF
Ta=25°C
-
-
-25°C
≤
Ta
≤
125°C,
V
CC
= 25V
12.7V
≤
V
CC
≤
30V, Ta=25°C
1.3
7
4.8
70
0.8
45.5
1.6
3.2
170
0.9
-
-
1.6
10
5.6
81.5
1.3
50
2.0
3.7
220
1.15
1
-
1.9
13
6.4
93
1.8
54.5
2.4
4.2
270
1.4
3
3
µA
µA
V
kHz
µs
kHz
µs
V
µA
mA
%
%
I
ST
I
CC
I
DCC
V
CC
< V
TH
(st)
Output not switching
50kHz, C
L
=1nF
-
-
-
0.14
6.5
8
0.2
10
12
mA
mA
mA
Symbol
V
TH(st)
HY
(st)
Conditions
V
CC
Increasing
-
Min.
10.5
1.4
Typ.
11.6
1.9
Max.
12.7
2.4
Unit
V
V
UNDER VOLTAGE LOCK OUT SECTION
Note:
1. These parameters, although guaranteed, are not 100% tested in production.
4
FAN7544
Typical Characteristics
0.008
0.007
0.006
0.005
8
10
9
idcc @VCC=30V
idcc @VCC=15V
idcc @VCC=12.5V
Idcc[A]
0.004
0.003
0.002
0.001
0.000
-0.001
0
5
10
15
20
25
30
Current [mA]
7
6
5
4
-60
-40
-20
0
20
40
60
80
100
120
140
Vcc[V]
Temperature [°C]
Figure 1. UVLO
14.0
13.5
13.0
12.5
12.0
11.0
10.5
10.0
9.5
9.0
8.5
8.0
7.5
7.0
-60
-40
-20
0
20
40
60
80
100
120
140
3
-60
-40
4
9
Figure 2. Dynamic Operating Current
UV+
UV-
icc @VCC=30V
icc @VCC=15V
iccl @VCC=12.5V
8
Current [mA]
Voltage [V]
11.5
7
6
5
-20
0
20
40
60
80
100
120
140
Temperature [°C]
Temperature [°C]
Figure 3. UVLO Hysteresis
53
Figure 4. Operating Current
Rt=80kΩ, Ct=470p
52
51
fosc [kHz]
50
49
48
47
-60
-40
-20
0
20
40
60
80
100
120
140
Temperature [°C]
Figure 5. Switching Frequency
5
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