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參數(shù)資料
| 型號： | TK65010TL |
| 廠商： | TOKO INC |
| 元件分類： | 電源管理 |
| 英文描述： | BATTERY VOLTAGE MONITOR |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | SOT-23, SMT-5 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 51K |
| 代理商： | TK65010TL |
January 1999 TOKO, Inc.
Page 5
TK65010
BATTERY IN
VMON
LBO
DBO
LOW BATTERY
DEAD BATTERY
GND
VIN
R1
R2
IFB
DESIGN CONSIDERATIONS
In order to design a voltage monitor utilizing the TK65010,
the two external resistors comprising the resistor divider
must be properly selected. Selecting the ratio of the
resistors will establish the lower monitoring threshold
(DBO). Selecting the value of the R
1
will establish the
upper monitoring threshold (LBO) relative to the lower
(DBO) threshold. The value of R
2
will be dictated by the
ratio R
1
/R
2
and the value of R
1
. For the following
explanations, please refer to the circuit diagram of
Figure 3.
SETTING THE DBO THRESHOLD
As mentioned above, the ratio of R
1
/R
2
established the
”dead battery” threshold. The dead battery comparator
trips when the voltage on the V
MON
pin passes through
approximately 690 mV and the current into the V
MON
pin is
approximately zero. Given the required dead battery
threshold, the ratio R
1
/R
2
can be selected utilizing the
following equation:
DBO Threshold = 690 mV x (1 + R
1
/R
2
)
or
R
1
/R
2
= (DBO Threshold - 690 mV) / 690 mV
SETTING THE LBO THRESHOLD
The threshold of the LBO comparator will be at a value
greater than the DBO threshold. The value of resistor
value R
1
dictates the difference between the LBO and
DBO thresholds as follows:
LBO Threshold = DBO Threshold x 1.029 + R
1
x 580 nA
or
R
1
= (LBO Threshold - DBO Threshold x 1.029) / 580 nA
RESISTOR TOLERANCE CONSIDERATIONS
The tolerance of the LBO and DBO thresholds will have a
significant dependence upon the tolerance of the resistive
components used in the resistor divider. When utilizing the
previously described equations for setting the LBO and
DBO thresholds, it is possible that optimal values of the
resistive elements R
1
and R
2
may be relatively large. Since
large resistive components are not always available with
tight tolerances, an alternate method can be used for
applications where tighter tolerances are required.
The purpose of the resistor divider connected between the
Battery Input and the V
MON
pin is twofold. The first purpose
is to appropriately select the divider ratio such that the
DBO threshold is set to the desired level. The second
purpose is to select the absolute resistor values such that
the LBO threshold is set to an appropriate level relative to
the DBO threshold. Effectively, an attenuated voltage
source with a relatively large output impedance is driving
the V
MON
pin. This scenario is illustrated in Figure 4.
FIGURE 3
VMON
VIN
R1
R2
+
R1 x R2
R1 + R2
VIN x R2
R1 + R2
VMON
FIGURE 4
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| TK65015 | STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TK65015 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR |
| TK65015M | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR |
| TK65015MBX | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR |
| TK65015MTL | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR |
| TK65018 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:CMOS SWITCHED CAPACITOR VOLTAGE CONVERTER WITH REGULATOR |
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