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| 型号： | LTC1697EMS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/8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
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All voltages specified with respect to GND pin.
Note 3: The dimming PWM frequency is set by the equation 5Hz/C DIM ( μ F).
Note 4 : Actual operating current will be higher due to lamp operating
current.
Note 5 : The LTC1697 is guaranteed to meet performance specifications
from 0 ° C to 70 ° C. Specifications over the –40 ° C to 85 ° C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
PI FU CTIO S
C DIM (Pin 1): Dimming Capacitor. Connect the pin to GND
with a 0.022 μ F capacitor (nominal). The value of capaci-
tance on the C DIM pin determines the dimming PWM
frequency. The transfer function of capacitance to fre-
quency is 5Hz/C DIM ( μ F).
V DIM (Pin 2): Dimming Control Pin. The V DIM pin controls
the duty cycle of the dimming PWM. It ranges from 0% at
V DIM = 1V to 100% at V DIM = 2V. If the V DIM voltage is
<0.4V the LTC1697 will enter shutdown mode after ≈ 50ms.
0V SEN (Pin 3): Overvoltage Sense Pin. Protects the high-
voltage transformer from the overvoltage condition that
occurs when the lamp is open or not present. This pin is
connected through a resistor to the emitters of the drive
transistors of the Royer oscillator.
SW (Pin 4): Switch Pin. Connect the inductor and optional
Note 6 : I LAMP(AVG) = the average of the magnitude (absolute value) of the
positive and negative lamp current flowing into and out of the LAMP pin.
Note 7 : For currents at or above I OVSEN(ON) , the switch duty cycle will be
0%.
Note 8 : At V DIM voltages below V DIM(SHDNON) the LTC1697 behaves as if
the SHDN pin was pulled low.
Note 9 : To minimize I Q shutdown, pull the SHDN pin below 0.1V.
Note 10 : 2mA ≤ I LAMP ≤ 5mA.
GND (Pin 5): Signal and Power Ground for the LTC1697.
LAMP (Pin 6): Lamp Current Feedback Pin. Connect this
pin to the CCFL lamp.
V IN (Pin 7): Input Supply Pin.
V C (PIN 8): Compensation Node. Connect this pin to GND
through a 0.1 μ F capacitor. See Application Information
section. A frequency compensation network is connected
to this pin to compensate the loop. See the section “V C
Compensation” for guidelines.
R PROG (Pin 9): Lamp Current Programming. Connect this
pin to GND with a 6.4k 1% resistor (nominal). See Appli-
cation Information section for resistor selection.
SHDN (Pin 10): Shutdown. Grounding this pin shuts down
the LTC1697. Tie to >1V to enable.
Schottky diode here. Minimize trace length to keep EMI
and high frequency ringing down.
1697f
3
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