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參數(shù)資料
| 型號： | L6924U |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, QCC16 |
| 封裝： | 3 X 3 MM, ROHS COMPLIANT, VFQFP-16 |
| 文件頁數(shù)： | 18/38頁 |
| 文件大?。?/td> | 598K |
| 代理商： | L6924U |
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L6924U
Application information: monitoring and protection
25/38
When the TH pin voltage rises and exceeds the VMINTH = 50 % of VREF (900 mV typ), the
L6924U 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 L6924U stops the charge until the TH pin
voltage rises at 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
formula:
Equation 12
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 13
It follows that:
Equation 14
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 formula:
Equation 15
Figure 19.
Pin connection
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
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