参数资料
| 型号： | LT3513EUHF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/22页 |
| 文件大小： | 0K |
| 描述： | IC REG 5-OUT FOR TFT-LCD 38QFN |
| 标准包装： | 52 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 4.5 V ~ 30 V |
| 输出数： | 5 |
| 输出电压： | 0.8 V ~ 40 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-WFQFN 裸露焊盘 |
| 供应商设备封装： | 38-QFN（5x7） |
| 包装： | 管件 |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
LT3513
OPERATION
R8 = R7 ?
– 1 ?
belowtheratedvoltageofthecapacitor.Besuretoplace
the 1μF ceramic as close as possible to the V IN and GND
pins on the IC for optimal noise immunity.
A final caution is in order regarding the use of ceramic
capacitors at the input. A ceramic input capacitor can
combine with stray inductance to form a resonant tank
circuit. If power is applied quickly (for example by plugging
the circuit into a live power source), this tank can ring,
doubling the input voltage and damaging the LT3513. The
solution is to either clamp the input voltage or dampen the
tank circuit by adding a lossy capacitor (an electrolytic)
in parallel with the ceramic capacitor. For details, see Ap-
plication Note 88.
Soft-Start and Shutdown
The RUN-SS1(Run/Soft-Start) pin is used to place the
switching regulators and the internal bias circuits in shut-
down mode. It also provides a soft-start function, along
with RUN-SS2 and RUN-SS3/4. If the RUN-SS1 pin is
pulled to ground, the LT3513 enters its shutdown mode
with all regulators off and quiescent current reduced to
~30μA. An internal 2μA current source pulls up on the
RUN-SS1, RUN-SS2, and RUN-SS3/4 pins. If the RUN-
SS1 pin reaches ~0.6V, the internal bias circuits start and
the quiescent currents increase to their nominal levels.
If a capacitor is tied from the RUN-SS1, RUN-SS2 or
RUN-SS3/4 pins to ground, then the internal pull-up
current will generate a voltage ramp on these pins. This
voltage clamps the V C pin, limiting the peak switch current
and therefore input current during start-up. The RUN-SS1
pin clamps V C1 , the RUN-SS2 pin clamps V C1 and the
RUN-SS3/4 pin clamps the V C3 and V C4 pins. A good value
for the soft-start capacitors is C OUT /10,000, where C OUT
is the value of the largest output capacitor.
V ON Pin Considerations
The V ON pin is the delayed output for switching regulator 3.
When the C T pin reaches 1.1V, the output disconnect PNP
turns on, connecting V ON to E3. The V ON pin is current
limited and will protect the LT3513 and input source from
a shorted output.
The V ON pin output is also controlled from the V ON_CLK
pin. When V ON_CLK is low, the V ON output will turn on if the
C T pin is greater than 1.1V. When V ON_CLK is high, greater
than 1.5V, the V ON output is disabled and the V ONSINK open
collector device turns on. If the V ONSINK pin is connected
to V ON through a resistor, the V ON voltage will decay with
a high V ON_CLK . V ON_CLK may be synced to the horizontal
scanning frequency to improve LCD image quality.
Low Voltage Dropout Linear Regulator
The LT3513 features an output to drive an external NPN
transistor LDO to provide a lower voltage logic supply volt-
age. The output is capable of providing 10mA of current to
the base of the NPN. The output of the LDO is controlled
by the FB5 pin. Choose the resistor values according to:
? V LDO ?
? 0.625V ?
R8 should be 10k or less to avoid bias current errors.
The internal compensation of the LDO relies on a low ESR
ceramic capacitor between the values of 2.2μF and 20μF.
X7R dielectrics are preferred, followed by X5R, as these
materials retain their capacitance over wide voltage and
temperature ranges.
Printed Circuit Board Layout
For proper operation and minimum EMI, care must be
taken during printed circuit board (PCB) layout. Figure 3
shows the high current paths in the step-down regula-
tor circuit. Note that in the step-down regulators, large,
switched currents flow in the power switch, the catch
diode and the input capacitor. In the step-up regulators,
large, switched currents flow through the power switch,
the switching diode and the output capacitor. In SEPIC and
3513fc
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3513EUHF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:2MHz High Current 5-Output Regulator for TFT-LCD Panels |
| LT3513IUHF#PBF | 功能描述:IC REG 5-OUT FOR TFT-LCD 38QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LT3513IUHF#TRPBF | 功能描述:IC REG 5-OUT FOR TFT-LCD 38QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LT3513IUHF-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:2MHz High Current 5-Output Regulator for TFT-LCD Panels |
| LT3513IUHF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:2MHz High Current 5-Output Regulator for TFT-LCD Panels |
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