参数资料
| 型号： | LT3513IUHF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/22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
V OUT – V IN
V OUT
R3 = R4 ? OUT – 1 ?
V OUT
V IN + V OUT
V OUT ? R5
R6 = – R5
output.Theminimumloadcurrentgenerallygoestozero
once the circuit has started. Even without an output load
current, in many cases the discharged output capacitor
will present a load to the switcher that will allow it to start.
INVERTER/STEP-UP CONSIDERATIONS
Regulating Positive Output Voltages
The output voltage is programmed with a resistor divider
between the output and the FB pin. Choose the resistors
according to:
? V ?
? 1.25 ?
R4 should be 10k or less to avoid bias current errors.
Regulating Negative Output Voltages
The LT3513 contains an inverting op amp with a gain of 1.
The NFB4 pin works just as the other FB pins. Choose the
resistors according to:
1.25
R5 should be 2.5k Ω or less to avoid bias current errors.
–V OUT
R6
NFB4
22
R5
3513 A2
Duty Cycle Range
The maximum duty cycle (DC) of the LT3513 switching
regulator is 75% for SW2, and 84% for SW3 and SW4.
The duty cycle for a given application using the step-up
or charge pump topology is:
DC =
The duty cycle for a given application using the inverter
or SEPIC is:
DC =
The LT3513 can still be used in applications where the duty
cycle, as calculated above, is greater than the maximum.
However, the part must be operated in discontinuous mode
so that the actual duty cycle is reduced.
Inductor Selection
Table 1 lists several inductor vendors and types that are
suitable to use with the LT3513. Consult each manufacturer
for detailed information and for their entire selection of
related parts. Use ferrite core inductors to obtain the best
efficiency, as core losses at frequencies above 1MHz are
much lower for ferrite cores than for powdered-iron units.
A 10μH to 22μH inductor will be the best choice for most
LT3513 step-up and charge pump designs. Choose an
inductor that can carry the entire switch current without
saturating. For inverting and SEPIC regulators, a coupled
inductor, or two separate inductors is an option. When
using coupled inductors, choose one that can handle
at least the switch current without saturating. If using
uncoupled inductors, each inductor need only handle ap-
proximately one-half of the total switch current. A 4.7μH
to 15μH coupled inductor or two 10μH to 22μH uncoupled
inductors will usually be the best choice for most LT3513
inverting and SEPIC designs.
3513fc
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LT3514EFE#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK ADJ 24-TSSOP 制造商:Linear Technology 功能描述:BUCK 350KHZ-2.2MHZ 3.2-36V 制造商:Linear Technology 功能描述:BUCK, 350KHZ-2.2MHZ, 3.2-36V, TSSOP-24 制造商:Linear Technology 功能描述:DC-DC CONV, BUCK, ADJ, 2.1MHZ, TSSOP-24, Primary Input Voltage:36V, No. of Outputs:3, Output Current:2A, No. of Pins:24, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:MSL 1 - Unlimited, Package / Case:24-TSSOP |
| LT3514EUFD#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK ADJ |
| LT3514EUFD#TRPBF | 制造商:Linear Technology 功能描述:IC REG BUCK ADJ |
| LT3514IFE#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK ADJ 24-TSSOP 制造商:Linear Technology 功能描述:BUCK 350KHZ-2.2MHZ 3.2-36V 制造商:Linear Technology 功能描述:BUCK, 350KHZ-2.2MHZ, 3.2-36V, TSSOP-24 制造商:Linear Technology 功能描述:DC-DC CONV, BUCK, ADJ, 2.1MHZ, TSSOP-24, Primary Input Voltage:36V, No. of Outputs:3, Output Current:2A, No. of Pins:24, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:MSL 1 - Unlimited, Package / Case:24-TSSOP 制造商:Linear Technology 功能描述:SP-SWREG/Monolithic, Triple Step-Down Switching Regulator with 100% Duty Cycle O |
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