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参数资料
| 型号： | TL7700CDGKT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | GREEN, PLASTIC, MSOP-8 |
| 文件页数： | 20/20页 |
| 文件大小： | 554K |
| 代理商： | TL7700CDGKT |
DETAILED DESCRIPTION
Sense-Voltage Setting
VCC
Vs
GND
CT
RESET
RL
R1
R2
Ct
VCC
RESET
GND
SENSE
Sense-Voltage Hysteresis Setting
www.ti.com........................................................................................................................................................... SLVS220E – JULY 1999 – REVISED MARCH 2009
The SENSE terminal input voltage, Vs, of the TL7700 typically is 500 mV. By using two external resistors, the
circuit designer can obtain any sense voltage over 500 mV. In Figure 19, the sensing voltage, Vs', is calculated
as:
Vs' = Vs × (R1 + R2)/R2
Where:
Vs = 500 mV typ at TA = 25°C
At room temperature, Vs has a variation of 500 mV ± 5 mV. In the basic circuit shown in Figure 19, variations of
[±5 ± (R1 + R2)/R2] mV are superimposed on Vs.
Figure 19.
If the sense voltage (Vs') does not have hysteresis in it, and the voltage on the sensing line contains ripples, the
resetting of TL7700 is unstable. Hysteresis is added to the sense voltage to prevent such problems. As shown in
Vhys = Is × R1
Where:
Is = 2.5 A typ at TA = 25°C
At room temperature, Is has variations of 2.5 mA ± 0.5 mA. Therefore, in the circuit shown in Figure 19, Vhys has
variations of (±0.5 × R1) mV. In circuit design, it is necessary to consider the voltage-dividing resistor tolerance
and temperature coefficient in addition to variations in Vs and Vhys.
Copyright 1999–2009, Texas Instruments Incorporated
9
Product Folder Link(s): TL7700
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TL7700CDGKTG4 | 功能描述:监控电路 Vltg Supervisor RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| TL7700CP | 功能描述:监控电路 VOLTAGE SUPERVISOR RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| TL7700CPE4 | 功能描述:监控电路 VOLTAGE SUPERVISOR RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| TL7700CPS | 制造商:Texas Instruments 功能描述: |
| TL7700CPSR | 功能描述:监控电路 Supply V RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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