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| 型号： | LTC1697EMS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC REG SW 1W CCFL LOW PWR 10MSOP |
| 标准包装： | 50 |
| 应用： | 控制器，冷阴极荧光灯（CCFL） |
| 输入电压： | 2.8 V ~ 5.5 V |
| 输出数： | 1 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 管件 |
LTC1697
APPLICATIO S I FOR ATIO
V DIM pin where DC = 0% at V DIM = 1V and DC = 100% at
V DIM = 2V. If desired, the internal dimming PWM can be
overridden by grounding the C DIM pin and applying the
input PWM signal to the V DIM pin. This external PWM
line regulation becomes unacceptable. A typical value for
the V C capacitor is 0.1 μ F. For further information on
compensation please refer to Application Note 65 or
consult the factory.
signal should be in the range of 150Hz to 500Hz.
OV SEN Operation
Lamp Feedback
In a typical application, the LAMP pin is connected to the
low voltage side of the lamp. The lamp pin is internally
connected to ground by a ~50 ? resistor. This resistor will
limit the voltage on the LAMP pin to ± 0.35V for a 5mA RMS
lamp current. The lamp feedback circuit removes a current
from V C approximating 1/40 of the absolute value of the
current through the 50 ? resistor.
The OV SEN pin can be used to protect the high voltage
transformer from an overvoltage condition that can occur
when the lamp is open or not present. Connect this pin
through a resistor to the emitters of the drive transistors
of the Royer oscillator. The voltage at the OV SEN pin is
specified by V OVSEN . The duty cycle of the LTC1697 SW pin
will be 0% when the current flowing out of the OV SEN pin
reaches I OVSEN (protect). See the manufacturers trans-
former specifications for transformer voltage ratings.
Current Programming Input (R PROG )
The I LAMP current is set with an external resistor con-
nected between this pin and ground. I LAMP = 32V/R PROG .
V C Compensation
The V C node is the point where the lamp feedback current,
the programming current, and the control for the switch-
ing controller meet. A single capacitor must be connected
from the V C pin to ground to compensate the feedback
loop. Careful consideration should be given to the value of
capacitance used. A large value (1 μ F) will give excellent
stability at high lamp currents but will result in degraded
line regulation. On the other hand, a small value (10nF) will
result in overshoot and poor load regulation. The value
chosen will depend on the maximum load current and
dimming range. After these parameters are decided upon,
Thermal Shutdown
This IC includes overtemperature protection that is in-
tended to protect the device during momentary overload
conditions. Junction temperature will exceed 125 ° C when
overtemperature protection is active. Continuous opera-
tion above the specified maximum operating junction
temperature may result in device degradation or failure.
Shutdown Operation
There are two ways to place the LTC1697 in shutdown. The
SHDN pin can be pulled below V SHDN-1 , or the V DIM pin can
be pulled below V DIM(SD-I) for more than approximately
50mS. For normal operation, both pins must be pulled
high. The SHDN pin must be pulled above V SHDN-H , and the
V DIM pin must be pulled above V DIM (SD-H) .
the value of the V C capacitor should be increased until the
1697f
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