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參數(shù)資料
| 型號： | LT3652EDD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A BATTERY CHARGE CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO12 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, DFN-12 |
| 文件頁數(shù)： | 7/26頁 |
| 文件大?。?/td> | 253K |
| 代理商： | LT3652EDD#TRPBF |
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LT3652
15
3652fc
For a three-resistor network, RFB1 and RFB2 follow the
relation:
RFB2/RFB1 = 3.3/(VBAT(FLT) – 3.3)
Example:
For VBAT(FLT) = 3.6V:
RFB2/RFB1 = 3.3/(3.6 - 3.3) = 11.
Setting divider current (IRFB) = 10μA yields:
RFB2 = 3.3/10μA
RFB2 = 330k
Solving for RFB1:
RFB1 = 330k/11
RFB1 = 30k
The divider equivalent resistance is:
RFB1||RFB2 = 27.5k
To satisfy the 250k equivalent resistance to the VFB
pin:
RFB3 = 250k 27.5k
RFB3 = 223k.
Because the VFB pin is a relatively high impedance node,
stray capacitances at this pin must be minimized. Special
attention should be given to any stray capacitances that
can couple external signals onto the pin, which can pro-
duce undesirable output transients or ripple. Effects of
parasitic capacitance can typically be reduced by adding
a small-value (20pF to 50pF) feedforward capacitor from
the BAT pin to the VFB pin.
Extra care should be taken during board assembly. Small
amounts of board contamination can lead to significant
shifts in output voltage. Appropriate post-assembly board
APPLICATIONS INFORMATION
Using a resistor divider with an equivalent input resistance
at the VFB pin of 250k compensates for input bias current
error. Required resistor values to program desired VBAT(FLT)
follow the equations:
RFB1 = (VBAT(FLT) 2.5 105) / 3.3
(Ω)
RFB2 = (R1 (2.5 105)) / (R1- (2.5 105))
(Ω)
The charge function operates to achieve the final float
voltage of 3.3V on the VFB pin. The auto-restart feature
initiates a new charging cycle when the voltage at the VFB
pin falls 2.5% below that float voltage.
Because the battery voltage is across the VBAT(FLT) pro-
gramming resistor divider, this divider will draw a small
amount of current from the battery (IRFB) at a rate of:
IRFB = 3.3 / RFB2
Precision resistors in high values may be hard to ob-
tain, so for some lower VBAT(FLT) applications, it may be
desirable to use smaller-value feedback resistors with an
additional resistor (RFB3) to achieve the required 250k
equivalent resistance. The resulting 3-resistor network,
as shown in Figure 5, can ease component selection
and/or increase output voltage precision, at the expense of
additional current through the feedback divider.
BAT
+
VFB
RFB2
RFB3
RFB1
LT3652
3652 F05
Figure 5. A Three-Resistor Feedback Network Can
Ease Component Selection
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3652EMSE | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Power Tracking 2A Battery Charger for Solar Power |
| LT3652EMSE#PBF | 功能描述:IC BATTERY CHARGER SOLAR 12MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 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:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR) |
| LT3652EMSE#PBF | 制造商:Linear Technology 功能描述:BATTERY CHARGER FOR SOLAR POWER 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, 2A, MSOP-12 |
| LT3652EMSE#TRPBF | 功能描述:IC BATT CHARGER SOLAR 2A 12MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LT3652EMSEPBF | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion 2A 4.2V MSOP12EP |
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