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| 型号： | LTC4110EUHF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 42/52页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY BACKUP MANAGER 38-QFN |
| 标准包装： | 52 |
| 功能： | 备份管理 |
| 电池化学： | 铅酸，锂离子，锂聚合物，镍镉，镍氢，超级电容器 |
| 电源电压： | 4.5 V ~ 19 V |
| 工作温度： | -40°C ~ 85°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： | 1341 (CN2011-ZH PDF) |
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LTC4110
APPLICATIONS INFORMATION
Example:
V DCIN = 12V, f OSC = 300kHz, Q G1 = Q G2 = 15nC,
I Q = 3mA
P D = 144mW
SNUBBER DESIGN
The values given in the applications schematics have been
found to work quite well for this 12V-1A application. Care
should be taken in selecting other values for your applica-
tion since ef?ciency may be impacted by a poor choice.
For a detailed look at snubber design, Application Note
19 is very helpful.
COMPONENT SELECTION
Current Sense Resistors
The LTC4110 uses up to three sense resistors—one of
them optional. In general, current sense resistors should
have a low temperature coef?cient and suf?cient power
dissipation capability to avoid self-heating. Tolerance
depends on system accuracy requirements.
R SNS(FET) : The power rating of R SNS(FET) is de?ned by the
highest value between I CHG or I CAL and the transformer
turns ratio. Use one the following equations to calculate
I RSNS(FET) depending on which value, I CHG or I CAL which-
ever is higher.
I R(SNSFETCHG) =
R CL : R CL power rating is a function of the maximum forward
current the system load draws. See Figure 11.
P R(CL) = I MAX2 ? R CL
Find a sense resistor who’s power rating is greater than
P R(CL)
R SNS(BAT) : R SNS(BAT) power rating is a function of the
highest current value between I CHG or I CAL with which
the battery will work. Plug in the higher of the two into
I BAT(MAX) and solve:
P R(SNSBAT) = I MAX2 ? R SNS(BAT)
Use a sense resistor with a power rating greater than
P SNS(BAT)
FLYBACK MOSFET SELECTION
The LTC4110 uses two low side N-channel switching
MOSFETs in its ?yback converter. These MOSFETs have
dual roles. An any given time, only one MOSFET is the
primary switch while the other acts as a synchronous recti-
?er on the secondary to improve ef?ciency. The individual
MOSFETs’ roles depend on whether the battery is being
charged or calibrated. Each MOSFET speci?cation must
account for both roles.
The MOSFET voltage ratings in a ?yback design must deal
with other factors beyond V IN . During switch “on” time, a
current is established in the primary leakage inductance
(L L) equal to peak primary current (I PRI ). When the switch
turns off, the energy stored in L L , (Energy = I PRI2 ? L L /2)
I CHG ?
1 +
V BAT
N ? V DCIN
N ? V BAT
E 2 ? V DCIN
+ 1
causes the switch voltage to ?y up, starting from the input
voltage on up to the breakdown of the MOSFET if the volt-
age is not clamped. Thus, the snubber design is critical
I R(SNSFETCAL) =
in dealing with this voltage spike and can in?uence the
MOSFET voltage selection value. From a MOSFET point
I CAL ?
1 +
V BAT
N ? V DCIN
N ? E 2 ? V BAT
V DCIN
+ 1
of view, the minimum voltage must be greater than the
snubber clamp voltage V SNUB . If V SNUB itself is too low,
zener clamp dissipation rises rapidly thus encouraging
higher MOSFET voltages. The maximum DC voltage that
Plug in the higher value of the above two results as
the N-channel MOSFETs sees is:
I R(SNSFET) and solve for power:
P R(SNSFET) = I R(SNSFET)2 ? R SNS(FET)
V CHG ( FET ) = V DCIN +
V BAT
N
V CAL ( FET ) = V BAT + N ? V DCIN
4110fb
42
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相关代理商/技术参数 |
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| LTC4110EUHF-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Battery Backup System Manager |
| LTC4110EUHF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Battery Backup System Manager |
| LTC4120IUD#PBF | 制造商:Linear Technology 功能描述:BATTERY CHARGER, 400MA, QFN-16, Battery Type:Li-Ion, Li-Polymer, Input Voltage:4 |
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