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参数资料
| 型号： | LT1768IGN |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | High Power CCFL Controller for Wide Dimming Range and Maximum Lamp Lifetime |
| 中文描述： | 1.5 A FLUORESCENT LIGHT CONTROLLER, 410 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件页数： | 3/20页 |
| 文件大小： | 301K |
| 代理商： | LT1768IGN |
LT1768
3
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
A
= 25
°
C, V
VIN
= 12V, I
DIO1/2
= 250
μ
A, V
PROG
= 0V, V
PWM
= 2.5V, I
RMAX
= –100
μ
A,
I
RMIN
= –100
μ
A, unless otherwise specified.
SYMBOL
I
PWM
PARAMETER
PWM Input Bias Current
PWM Duty Cycle
PWM Frequency
DIO1/2 Positive Voltage
DIO1/2 Negative Voltage
VC High Clamp Voltage
VC Switching Threshold
SENSE Input Bias Current
SENSE Threshold for Current Limit
CONDITIONS
MIN
TYP
0.6
50
110
1.7
–1.1
3.7
0.7
–25
100
90
98
MAX
4
55
130
1.9
–1.3
3.9
0.95
–30
115
UNITS
G
μ
A
%
Hz
V
V
V
V
μ
A
mV
mV
A/A
V
PROG
= 1.75
C
T
= 0.22
μ
F (Note 7)
I
DIO
= 14mA
I
DIO
= –14mA
V
PROG
= 4.5V (Note 8)
V
PROG
= 4.5V (Note 8)
V
SENSE
= 0V
V
VC
= V
VCCLAMP
, Duty Cycle <50%, V
PROG
= 1V
V
VC
= V
VCCLAMP
, Duty Cycle 80%, V
PROG
= 1V
V
PROG
= 4.5V (Note 5)
V
PROG
= 4.5V, I
DIO1
or I
DIO2
= 0, V
VC
= 2.5V,
(Note 5)
V
PROG
< 0.75V (Note 6)
V
PROG
< 0.75V, I
DIO1
or I
DIO2
= 0, V
VC
= 2.5V,
(Note 6)
45
90
V
DIO1/2
V
VCCLAMP
3.6
0.5
I
SENSE
V
SENSE
85
I
DIO1/2
to I
RMAX
Ratio
G
94
104
45
9
49
10
55
11
A/A
A/A
I
DIO1/2
to I
RMIN
Ratio
G
9
10
1.5
1.5
10.2
12.5
0.4
125
0.2
20
160
11
A/A
I
GATE
GATE Drive Peak Source Current
GATE Drive Peak Sink Current
GATE Drive Saturation Voltage
GATE Drive Clamp Voltage
GATE Drive Low Saturation Voltage
Open LAMP Threshold
FAULT Pin Saturation Voltage
FAULT Pin Leakage Current
Thermal ShutdownTemperature
A
A
V
V
V
V
VIN
= 12V, I
GATE
= –100mA, V
PROG
= 4.5V
V
VIN
= 24V, I
GATE
= –10mA, V
PROG
= 4.5V
I
GATE
= 100mA
(Note 9)
I
FAULT
= 1mA, I
DI01
, I
DI02
= 0
μ
A, V
PROG
= 4.5V
V
FAULT
= 5V
G
9.8
G
14
0.6
150
0.3
100
G
100
μ
A
V
nA
°
C
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
This is the threshold voltage where the lamp current switches
from zero current to minimum lamp current. For V
PROG
less than the
threshold voltage, lamp current will be at zero. For V
PROG
greater than the
threshold voltage, lamp current will be equal to the minimum lamp
current. Minimum lamp current is set by the value of the resistor from the
R
MIN
pin to ground. See Applications Information for more details.
Note 3:
This is the threshold voltage where the device starts to pulse width
modulate the lamp current. For V
PROG
less than the threshold voltage,
lamp current will be equal to the minimum lamp current. For V
PROG
greater than the threshold voltage, lamp current will be pulse width
modulated between the minimum lamp current and some higher value.
Minimum lamp current is set by the value of the resistor from the R
MIN
pin
to ground. The higher value lamp current is a function of the R
MAX
resistor
to ground value, and the voltages on the PWM and PROG pins. See
Applications Information for more details.
Note 4:
This is the threshold voltage where the lamp current reaches its
maximum value. For V
PROG
greater than the threshold voltage, there will
be no increase in lamp current. For V
PROG
less than the threshold voltage,
lamp current will be at some lower value. Maximum lamp current is set by
The
G
denotes the specifications which apply over the full operating
the value of the resistor from the R
MAX
pin to ground. The lower value
lamp current is a function of the R
MIN
and R
MAX
resistors, and the
voltages on the PWM and PROG pins. See Applications Information for
more details.
Note 5:
I
DIO1/2
to I
RMAX
ratio is determined by setting I
RMAX
to –100
μ
A,
V
PROG
to 4.5V, V
VC
to 2.5V, and then ramping a DC current out of the
DIO1/2 pins from zero until the DC current in the VC voltage source
current equals zero. The I
DIO1/2
to I
RMAX
ratio is then defined as (I
DIO1
+
I
DIO2
)/I
RMAX
. See Applications Information for more details.
Note 6:
I
DIO1/2
to I
RMIN
ratio is determined by setting I
RMIN
to –100
μ
A,
V
PROG
to 0.75V, V
VC
to 2.5V, and then ramping a DC current out of the
DIO1/2 pins from zero until the DC current in the VC voltage source
current equals zero. The I
DIO1/2
to I
RMIN
ratio is then defined as (I
DIO1
+
I
DIO2
)/I
RMIN
. See Applications Information for more details.
Note 7:
The PWM frequency is set by the equation PWMFREQ = 22Hz/
C
T
(
μ
F).
Note 8:
For VC voltages less than the switching threshold, GATE switching
is disabled.
Note 9:
An open lamp will be detected if either I
DIO1
or I
DIO2
is less than
the threshold current for at least 1 full PWM cycle.
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