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| 型号： | LT1768IGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR CCFL SGL/MULT HP 16SSOP |
| 标准包装： | 2,500 |
| 类型： | CCFL 控制器 |
| 频率： | 300 ~ 410 kHz |
| 电流 - 电源： | 7mA |
| 电流 - 输出： | 1.5A |
| 电源电压： | 9 V ~ 24 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 带卷 (TR) |
LT1768
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
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
V DIO1/2
V VCCLAMP
I SENSE
V SENSE
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
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
q
MIN
45
90
3.6
0.5
85
TYP
0.6
50
110
1.7
–1.1
3.7
0.7
–25
100
MAX
4
55
130
1.9
–1.3
3.9
0.95
–30
115
UNITS
μ A
%
Hz
V
V
V
V
μ A
mV
V VC = V VCCLAMP , Duty Cycle 80%, V PROG = 1V
90
mV
I DIO1/2 to I RMAX Ratio
V PROG = 4.5V (Note 5)
q
94
98
104
A/A
V PROG = 4.5V, I DIO1 or I DIO2 = 0, V VC = 2.5V,
(Note 5)
45
49
55
A/A
I DIO1/2 to I RMIN Ratio
V PROG < 0.75V (Note 6)
q
9
10
11
A/A
V PROG < 0.75V, I DIO1 or I DIO2 = 0, V VC = 2.5V,
I GATE
GATE Drive Peak Source Current
GATE Drive Peak Sink Current
(Note 6)
9
10
1.5
1.5
11
A/A
A
A
GATE Drive Saturation Voltage
V VIN = 12V, I GATE = –100mA, V PROG = 4.5V
q
9.8
10.2
V
GATE Drive Clamp Voltage
GATE Drive Low Saturation Voltage
Open LAMP Threshold
FAULT Pin Saturation Voltage
FAULT Pin Leakage Current
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
q
q
100
12.5
0.4
125
0.2
20
14
0.6
150
0.3
100
V
V
μ A
V
nA
Thermal ShutdownTemperature
160
° 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 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.
3
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