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參數(shù)資料
| 型號(hào)： | LTC3765IMSE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-16 |
| 文件頁數(shù)： | 7/24頁 |
| 文件大小： | 265K |
| 代理商： | LTC3765IMSE#TRPBF |
LTC3765
15
3765f
RFL
CFL
RSENSE
PRIMARY
NMOS
PG
IS+
IS–
LTC3765
3765 F05
Figure 5. Overcurrent Sense Filtering
APPLICATIONS INFORMATION
where COUT is the output capacitor value and VIN(MAX) is
the maximum input voltage. The soft-start capacitor value
should be in the range of 10nF to 1F. Do not use a value
lessthan10nF.Thesoft-startcapacitoralsodeterminesthe
relative timing of the output voltage rise and the LTC3766
bias supply rise. The value chosen should be verified with
the equations in the following Self-Starting Start-Up sec-
tion to ensure that the bias supply rises before the output
voltage is close to the regulation point.
Care should be taken with the routing of the IS+ and IS–
traces to avoid noise pickup. The traces should be Kelvin-
sensed off of the sense resistor and routed right beside
each other on an inner layer of the PCB. Avoid routing near
high voltage, high slew rate nodes such as the drain of the
primary NMOS and the drain of the active clamp PMOS.
Depending on PCB layout and the shielding of the traces
going to the IS+ and IS– pins, it is sometimes necessary
to add a small amount of filtering as shown in Figure 5.
Typically, values of RFL = 100Ω and CFL = 200pF to 1nF
will provide adequate filtering of noise pickup without
significantly degrading the overcurrent response time.
Self-Starting Start-Up
When starting up, the LTC3765 begins switching in an
open-loop fashion to supply power to the secondary side
LTC3766. When the LTC3766 has adequate bias voltage
andhasmetotherconditionsforstart-up,itbeginssending
both duty cycle information and power through the pulse
transformer connected to the IN+/IN– pins.
The LTC3765’s start-up switching frequency is set by a
resistor from FSUV to ground. Since the internal oscilla-
tor is only used in start-up, the frequency accuracy is not
critical; however, avoid setting the frequency excessively
low, as this will cause high currents in the transformer and
inductor. To minimize the impact on the transition due to
the duty cycle handoff from the LTC3765 to the LTC3766,
thisfrequencyshouldbesettotheapproximatelythesame
frequency as the LTC3766. The frequency set resistor
(RFS) value can be selected using the following equation:
RFS =
6.2 109
fSW
– 4.5k
Table 2 shows standard 5% resistor values of RFS for
common switching frequencies.
Table 2. Standard RFS Resistor Values for Common Frequencies
FREQUENCY
RFS VALUE
150kHz
36k
200kHz
27k
250kHz
20k
275kHz
18k
350kHz
13k
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| LTC3766EGN#PBF | 功能描述:IC CONTROLLER SYNCH 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:Direct Flux Limit™, PolyPhase® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
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