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参数资料
| 型号： | DC1568A |
| 厂商： | Linear Technology |
| 文件页数： | 11/26页 |
| 文件大小： | 0K |
| 描述： | BOARD BATTERY CHARGER SOLAR PWR |
| 视频文件： | Linear Technology LT3652 |
| 设计资源： | DC1568A Design Files DC1568A Schematic |
| 特色产品： | Energy Harvesting Power Products |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电池充电器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | LT3652 |
| 主要属性： | 多种化学，太阳能 |
| 次要属性： | LED 状态指示器 |
| 已供物品： | 板 |
| 相关产品： | LT3652HVIMSE#TRPBF-ND - IC BATTERY CHARGER 2A 12-MSOP LT3652HVIMSE#PBF-ND - IC BATTERY CHARGER 2A 12-MSOP LT3652HVIDD#TRPBF-ND - IC BATTERY CHARGER 2A 12-DFN LT3652HVIDD#PBF-ND - IC BATTERY CHARGER 2A 12-DFN LT3652HVEMSE#TRPBF-ND - IC BATTERY CHARGER 2A 12-MSOP LT3652HVEDD#TRPBF-ND - IC BATTERY CHARGER 2A 12-DFN LT3652HVEDD#PBF-ND - IC BATTERY CHARGER 2A 12-DFN LT3652HVEMSE#PBF-ND - IC BATTERY CHARGER 2A 12-MSOP LT3652IMSE#TRPBF-ND - IC BATT CHARGER SOLAR 2A 12MSOP LT3652IMSE#PBF-ND - IC BATT CHARGER SOLAR 2A 12MSOP 更多... |
LT3652
APPLICATIONS INFORMATION
The I TH error voltage corresponds linearly to average
current sensed across the inductor current sense resistor,
allowing maximum charge current control by limiting the
effective voltage range of I TH . A clamp limits this voltage
to 1V which, in turn, limits the current sense voltage to
100mV. This sets the maximum charge current, or the
current delivered while the charger is operating in con-
stant-current (CC) mode, which corresponds to 100mV
across R SENSE . The I TH voltage is pulled down to reduce
this maximum charge current should the voltage on the
V IN_REG pin falls below 2.7V (V IN_REG(TH) ) or the die tem-
perature approaches 125°C.
If the voltage on the V FB pin is below 2.3V (V FB(PRE) ),
the LT3652 engages precondition mode. During the
precondition interval, the charger continues to operate in
constant-current mode, but the maximum charge current
is reduced to 15% of the maximum programmed value
as set by R SENSE .
When the charger output voltage approaches the float volt-
age, or the voltage on the V FB pin approaches 3.3V (V FB(FLT) ),
the charger transitions into constant-voltage (CV) mode
and charge current is reduced from the maximum value.
As this occurs, the I TH voltage falls from the limit clamp
and servos to lower voltages. The IC monitors the I TH volt-
age as it is reduced, and detection of C/10 charge current
is achieved when I TH = 0.1V. If the charger is configured
for C/10 termination, this threshold is used to terminate
the charge cycle. Once the charge cycle is terminated,
the CHRG status pin becomes high-impedance and the
charger enters low-current standby mode.
The LT3652 contains an internal charge cycle timer that
terminates a successful charge cycle after a programmed
amount of time. This timer is typically programmed to
achieve end-of-cycle (EOC) in 3 hours, but can be con-
figured for any amount of time by setting an appropriate
timing capacitor value (C TIMER ). When timer termination
the C/10 current level, the IC will indicate a fully-charged
battery status, but the charger continues to source low
currents into the battery until the programmed EOC time
has elapsed, at which time the charge cycle will terminate.
At EOC when the charging cycle terminates, if the battery
did not achieve at least 97.5% of the full float voltage,
charging is deemed unsuccessful, the LT3652 re-initiates,
and charging continues for another full timer cycle.
Use of the timer function also enables bad-battery detec-
tion. This fault condition is achieved if the battery does
not respond to preconditioning, such that the charger
remains in (or enters) precondition mode after 1/8th of
the programmed charge cycle time. A bad battery fault
halts the charging cycle, the CHRG status pin goes high-
impedance, and the FAULT pin is pulled low.
When the LT3652 terminates a charging cycle, whether
through C/10 detection or by reaching timer EOC, the
average current mode analog loop remains active, but
the internal float voltage reference is reduced by 2.5%.
Because the voltage on a successfully charged battery is
at the full float voltage, the voltage error amp detects an
over-voltage condition and I TH is pulled low. When the
voltage error amp output drops below 0.3V, the IC enters
standby mode, where most of the internal circuitry is dis-
abled, and the V IN bias current is reduced to 85μA. When
the voltage on the V FB pin drops below the reduced float
reference level, the output of the voltage error amp will
climb, at which point the IC comes out of standby mode
and a new charging cycle is initiated.
V IN Input Supply
The LT3652 is biased directly from the charger input supply
through the V IN pin. This supply provides large switched
currents, so a high-quality, low ESR decoupling capacitor
is recommended to minimize voltage glitches on V IN . The
V IN decoupling capacitor (C VIN ) absorbs all input switching
is used, the charge cycle does not terminate when C/10
is achieved. Because the CHRG status pin responds to
3652fd
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相关代理商/技术参数 |
参数描述 |
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| DC1568A | 制造商:Linear Technology 功能描述:BATTERY CHARGER DEMO. BOARD ((NW)) |
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| DC1571A-C | 功能描述:BOARD SAR ADC LTC2381-16 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:QuikEval™ 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| DC1571B | 制造商:Aleph America Corporation 功能描述: |
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