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参数资料
| 型号： | L6924D013TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC16 |
| 封装： | 3 X 3 MM, VFQFPN-16 |
| 文件页数： | 7/38页 |
| 文件大小： | 1454K |
| 代理商： | L6924D013TR |
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L6924D
Operation description
Doc ID 11908 Rev 9
15/38
Where,
ILIM = current limit of the wall adapter, and RDS(on) = resistance of the power MOSFET.
The difference between the set charge current and the adapter limit should be high enough
to minimize the RDS(on) value (and the power dissipation). This makes the control loop
completely unbalanced and the power element is fully turned on.
adapter current limit of 500 mA.
Figure 8.
RDS(on) curves vs charging current and output voltage
Neglecting the voltage drop across the charger (
ΔV
MOS) when the device operates in this
condition, its input voltage is equal to the battery one, and so a very low operating input
voltage (down to 2.5 V) is required. The power dissipated by the device during this phase is:
Equation 4
When the battery voltage approaches the final value, the charger gets back the control of
the current, reducing it. Due to this, the upstream adapter exits the current limit condition
and its output goes up to the regulated voltage VADP. This is the worst case in power
dissipation:
Equation 5
In conclusion, the advantage of the linear charging approach is that the designer has the
direct control of the charge current, and consequently the application can be very simple.
The drawback is the high power dissipation.
The advantage of the Quasi-Pulse charging method is that the power dissipated is
dramatically reduced. The drawback is that a dedicated upstream adapter is required.
2
)
(
LIM
on
DS
CH
I
R
P
×
=
LIM
BAT
ADP
DIS
I
V
P
×
=
)
(
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相关代理商/技术参数 |
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| L6924U | 功能描述:电池管理 USB Battery Charger System w/integra RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| L6924U013TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer |
| L6924UTR | 功能描述:电池管理 Battery Charger USB Compatible RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| L6925 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR |
| L6925013TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR |
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