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| 型号： | LTC4110EUHF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 41/52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
Avoid capacitors with high leakage currents. See the
Programming Charge Time with TIMER and V REF Pins
section for details concerning the V REF pin. For minimum
delay open the ACPDLY pin.
BAT PIN CURRENT IN IDLE MODE
When LTC4110 is in IDLE mode (i.e., not in charge, calibra-
tion or backup mode), there will be a typical 30μA current
pulled from the battery through the BAT pin, if this current
is of concern, a diode in series with a resistor can be con-
nected between DCIN and battery to compensate it.
SHOW BATTERY FULL WITH ACPB AND CHGB
Tie the source of an N-MOSFET to ACPb, gate to CHGb and
This current ramp starts at zero right after the primary side
MOSFET (CHGFET in charge mode, DCHFET in calibration
mode) is turned on. The current rises linearly towards a
peak of V SEC /400k (where V SEC = BAT in charge mode,
V SEC = DCIN in calibration mode), shutting off once the
primary side MOSFET is turned off. A series resistor (R SL )
connecting the I SENSE pin to the current sense resistor
(R SNS(FET) ) thus develops a ramping voltage drop. From
the perspective of the I SENSE pin, this ramping voltage
adds to the voltage across the sense resistor, effectively
reducing the current comparator threshold in proportion
to duty cycle. This stabilizes the control loop against
subharmonic oscillation. The amount of reduction in the
current comparator threshold ( Δ V ISENSE ) can be calculated
using the following equation:
drain in series with R to an LED to show battery full. In
that case if CHG or ACP status LED is not needed, replace
it with a short but keep the pull-up resistor.
Δ V ISENSE = DUTY CYCLE ?
V SEC
400k
? R SL
To program m = m2,
1 400 k ? R SNS , FET
+5V
R SL =
N F ? Lm
?
FULL
ACP
CHG
CHGb
ACPb
where
N = transformer turns ratio N BAT /N DCIN
R SNS(FET) = sense resistor connected between MOSFET
and GND
f = switching frequency
4110 F18
Figure 18. Display Battery Full
FLYBACK COMPENSATION
The values given for the I TH pin in the application schematics
have been found to compensate both the voltage loop and
current loop quite well. However, if the resistor connected
to I CHG , I CAL or I PCC is larger than 100k, a 37k resistor in
series with a 100nF capacitor should also be connected
between that pin and GND to compensate the loop.
SLOPE COMPENSATION
The LTC4110 injects a ramping current through its I SENSE
pin into an external slope compensation resistor (R SL ).
Lm = magnetizing inductance of the transformer
Designs not needing slope compensation may replace
R SL with a short.
CALCULATING IC POWER DISSIPATION
The power dissipation of the LTC4110 is dependent upon
the gate charge of the two MOSFETs (Q G1 and Q G2 ). The
gate charge is determined from the manufacturer’s data
sheet and is dependent upon both the gate voltage swing
and the drain voltage swing of the MOSFET. Use 5V for
the gate voltage swing and V DCIN for the drain voltage
swing.
P D = V DCIN ? (f OSC (Q G1 + Q G2 ) + I Q )
4110fb
41
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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 |
| LTC4150 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage, High-Side Current Sense |
| LTC4150_1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Coulomb Counter/ Battery Gas Gauge |
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