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參數(shù)資料
| 型號： | L6924D013TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC16 |
| 封裝： | 3 X 3 MM, VFQFPN-16 |
| 文件頁數(shù)： | 18/38頁 |
| 文件大?。?/td> | 1454K |
| 代理商： | L6924D013TR |
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L6924D
Application information: monitoring and protection
Doc ID 11908 Rev 9
25/38
When the TH pin voltage rises and exceeds the VMINTH = 50% of VREF (900 mV typ), the
L6924D stops the charge, and indicates a fault by the status pins. The device re-starts to
charge the battery, only when the voltage at the TH pin goes under VMINTH_HYS = 780 mV
(typ).
For what concerns the high temperature limit, when the TH pin voltage falls under the
VMAXTH = 12.5% of VREF (225 mV Typ.), the L6924D stops the charge until the TH pin
voltage rises to the VMAXTH_HYS = 248 mV (Typ.).
When the battery is at the low temperature limit, the TH pin voltage is 900 mV. The correct
resistance ratio to set the low temperature limit at 0°C can be found with the following
equation:
Equation 14
Where RUP is the pull-up resistor, VREF is equal to 1.8 V, and RNTC0°C is the value of the
NTC at 0°C. Since at the low temperature limit VMINTH = 900 mV:
Equation 15
It follows that:
Equation 16
Similarly, when the battery is at the high temperature limit, the TH pin voltage is 225 mV. The
correct resistance ratio to set the high temperature limit at 50°C can be found with the
following equation:
Equation 17
Where RNTC50°C is the value of the NTC at 50°C. Considering VMAXTH = 225 mV it follows
that:
Equation 18
Consequently:
Equation 19
C
NTC
UP
C
NTC
REF
MINTH
R
V
°
+
×
=
0
C
NTC
UP
C
NTC
R
°
+
×
=
0
8
.
1
9
.
0
UP
C
NTC
R
=
°
0
C
NTC
UP
C
NTC
REF
MAXTH
R
V
°
+
×
=
50
C
NTC
UP
C
NTC
R
°
+
×
=
50
8
.
1
225
.
0
7
50
UP
C
NTC
R
=
°
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6924U | 功能描述:電池管理 USB Battery Charger System w/integra RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| L6924U013TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer |
| L6924UTR | 功能描述:電池管理 Battery Charger USB Compatible RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| L6925 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR |
| L6925013TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR |
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