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参数资料
| 型号： | L9704 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 电源管理 |
| 英文描述： | 8-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP20 |
| 封装： | DIP-20 |
| 文件页数： | 4/8页 |
| 文件大小： | 351K |
| 代理商： | L9704 |
APPLICATION CIRCUIT DIAGRAM
Figure 1 : Typical application diagram for the L9704 circuit. The current flowing in the arrow direction is as-
sumed positive. The external capacitors CIN and COUT represent the total wiring capacitance at
the corresponding pins.
FUNCTIONAL DESCRIPTION
The L9704 circuit monitors the status of the contacts
connected to battery and through the series external
resistors RIN to the contact sense input pins. The
contacts equivalent circuit is supposed to be as
shown in fig. 2.
The L9704 circuit compares the input current with
the current through the internal reference resistor.
The device is designed to work with an external input
series resistor of RIN1-8 = 1k
. With this input resistor
the contact current, when the contact is closed and
the device activated (EN = LOW) is
VBAT +
VBAT – 2V
IIN =
1K
(1)
For this calculation the limit value of the VIN (satura-
tion voltage of 2V) was considered so that the lowest
limit value of IIN is calculated in (1).
The function of the circuit can be demonstrated with
the transfer characteristics, showing the output
status as a function of the input resistor RI, shown
in figure 3. The input resistor is a sum of the RIN and
the contact resistance RCON or RCOFF, for the closed
contact :
RI = RIN + RCON,(2)
and for the open contact :
RI = RIN + RCOFF.(3)
The output goes HIGH when the input resistance in-
creases above 6.5k
(typical value) and goes LOW,
when the input resistance decreases below 4.8K
(typical value). The limit values of RI = 1.1K
for
LOW and RI = 29k
for HIGH implies that a contact
with RCON = 100
(at IIN = 10mA) will be recognized
as ON = LOW and a contact with RCOFF = 28k
will
be recognized as OFF = HIGH. These limits are
valid within the supply voltage range 5V
≤ Vs ≤ 16V,
the
battery
voltage
potential
difference
of
VBAT ≤ 0.1VBAT and the variation of thereverse
battery protection diode D1 voltage from 0.5V to 1V.
L9704
4/8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L9704D | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:OCTAL SUPPLY CONTACT MONITORING CIRCUIT |
| L9705 | 功能描述:开关变换器、稳压器与控制器 Double Quad Interfac RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L9705D | 功能描述:开关变换器、稳压器与控制器 Double Quad Interfac RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L9708 | 功能描述:低压差稳压器 - LDO Quad Squib Driver PTS SmartPower RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| L970813TR | 功能描述:低压差稳压器 - LDO Quad Squib Driver PTS SmartPower RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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