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参数资料
| 型号： | PT7M7435TAE |
| 厂商： | PERICOM SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封装： | LEAD FREE, MO-178AA, SOT-23, 5 PIN |
| 文件页数： | 6/10页 |
| 文件大小： | 376K |
| 代理商： | PT7M7435TAE |
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PT0213(06/05)
Ver: 1
5
Data Sheet
PT7M7433/34/35
P Supervisory Circuit
Hysteresis
Hysteresis increases the comparator’s noise margin by
increasing the upper threshold or decreasing the lower
threshold (see blow). The hysteresis prevents the output from
oscillating (chattering) when VCC is near the low-battery
threshold. This is especially important for applications where
the load on the battery creates significant fluctuations in
battery voltages.
Adjustable Hysteresis (PT7M7433/34/35)
Block diagram shows the correct connections for the external
resistor-dividers. To adjust the low-battery threshold and
hysteresis connect resistor R1 between VCC and LTHIN,
resistor R2 between LTHIN and HTHIN, and R3 between
HTHIN and GND. The hysteresis for the PT7M7433/34/35 is
determined by an external resistor-divider network (see
Application information Resistor-Value Selection).
Application Information
Resistor-Value Selection (Programming the
Adjustable Thresholds)
VREF = VLTHIN = VHTHIN = 615mV
VTRIPLOW = VLTH = VREF (
)
VTRIPHIGH = VHTL = VREF (
)
RTOTAL = R1 + R2 + R3
Use the following steps to determine values for R1, R2, and
R3 of Functional Block Diagram.
1) Choose a value for RTOTAL. Because the PT7M7433/34/35
have very high input impedance, RTOTAL can be up to
5M.
2) Calculate R3 based on RTOTAL and the desired upper trip
point:
R3 =
=
3) Calculate R2 based on RTOTAL, R3, and the desired lower
trip point:
R2 =
- R3
4) Calculate R1 based on RTOTAL, R3, and R2:
R1 = RTOTAL – R2 – R3
VBATT
VHTH
VLTH
VHYST
tLBCP
LBO
HTH – Battery voltage good enable operation
LTH – Battery voltage low suspend/disable operation
R1 + R2 + R3
R2 + R3
R1 + R2 + R3
R3
VREF × RTOTAL
VTRIPHIGH
615mV
× RTOTAL
VTRIPHIGH
615mV
× RTOTAL
VTRIPLOW
Fig 1. PT7M7433/34/35 adjustable hysteresis
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相关代理商/技术参数 |
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| PT7M7809TTEX | 功能描述:IC SUPERVISOR 3.08V SOT23-3 RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 其它有关文件:STM6905 View All Specifications 标准包装:1 系列:- 类型:多压监控器 监视电压数目:5 输出:开路漏极或开路集电极 复位:低有效 复位超时:最小为 140 ms 电压 - 阀值:2.188V，2.955V，可调，可调，可调 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-TSSOP 包装:Digi-Reel® 产品目录页面:1197 (CN2011-ZH PDF) 其它名称:497-8728-6 |
| PT7M7809ZTEX | 功能描述:IC SUPERVISOR 2.32V SOT23-3 RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 其它有关文件:STM6905 View All Specifications 标准包装:1 系列:- 类型:多压监控器 监视电压数目:5 输出:开路漏极或开路集电极 复位:低有效 复位超时:最小为 140 ms 电压 - 阀值:2.188V，2.955V，可调，可调，可调 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-TSSOP 包装:Digi-Reel® 产品目录页面:1197 (CN2011-ZH PDF) 其它名称:497-8728-6 |
| PT7M7810STEX | 制造商:Pericom Semiconductor Corporation 功能描述:RESET IC |
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