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参数资料
| 型号： | TPS2393PWG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 封装： | GREEN, PLASTIC, TSSOP-14 |
| 文件页数： | 16/33页 |
| 文件大小： | 596K |
| 代理商： | TPS2393PWG4 |
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TPS2392
TPS2393
SLUS536C AUGUST 2002 REVISED AUGUST 2004
www.ti.com
23
APPLICATION INFORMATION
The UV and OV thresholds can be individually programmed with a three-resistor divider connected to it as
shown in the typical application diagram, and again in Figure 27a. When the desired trip voltages and
undervoltage hysteresis have been established for the protected board, the resistor values needed can be
determined from the following equations. Generally, the process is simplest by first selecting the top leg of the
divider (R1 in the diagram) needed to obtain the threshold hysteresis. This value is calculated from equation (8).
R1
+
V
HYS_UV
10
mA
where:
D VHYS_UV is the undervoltage hysteresis value
For example, assume the typical application design targets have been set to undervoltage turn-on at 33 V (input
supply rising), turn-off at 31 V (input voltage falling), and overvoltage shutdown at 72 V. Then equation (8) yields
R1 = 200 k
for the 2-V hysteresis. Once the value of R1 is selected, it is used to calculate resistors R2 and
R3.
R2
+
1.4
R1
V
UV_L * 1.4
1
*
V
UV_L
V
OV_L ) 10
*5
R1
R3
+
1.4
R1
V
UV_L
V
UV_L * 1.4
V
OV_L ) 10
*5
R1
where:
D VUV_L is the UVLO threshold when the input supply is low; i.e., less than VUV
D VOV_L is the OVLO threshold when the input supply is low; .i.e., less than VOV
Again referring to the example schematic, equations (9) and (10) produce R2 = 4.909 k
(4.99 k selected)
and R3 = 3.951 k
(3.92 k selected), as shown. For the selected resistor values, the expected nominal supply
thresholds are as shown on the typical application diagram. The hysteresis on the overvoltage threshold, as
seen at the supply inputs, is given by the quantity (10
A) * (R1 + R2). For the majority of applications, this value
will be very nearly the same as the UV hysteresis, since typically R1 >> R2.
If more independent control is needed for the OVLO hysteresis, there are several options. One option is to use
separate dividers for both the UVLO and OVLO pins, as shown in Figure 27b. In this case, once R1 and R7
have been selected for the required hysteresis per equation (8), the bottom resistors in the dividers (R2 and
R8 in Figure 27b) can be found from equation (11).
R
XVLO +
V
REF
V
XV_L * VREF
R
TOP
where:
D RXVLO is R2 or R8
D RTOP is R1 or R7 as appropriate for the threshold being set
D VXV_L is the under (VUV_L ) or overvoltage (VOV_L ) threshold at the supply input
D VREF is either VTH_UV or VTH_OV from the specification table, as required for the resistor being calculated
capacitor on UVLO pin
As shown in the typical application diagram, a minimum 1500 pF capacitor is required on the UVLO pin of the
TPS2392 or TPS2393. For some systems, it may be desirable to slow down the response of the controller to
undervoltage conditions. For example, if frequent voltage dips are anticipated due to other power events in the
system, it may be beneficial to delay somewhat the response of the detection circuit. For these situations, the
size of the capacitor can be increased accordingly, over the value shown.
(8)
(9)
(10)
(11)
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相关代理商/技术参数 |
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| TPS2394EVM-652 | 功能描述:电源管理IC开发工具 Eval Mod for TPS2394 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS2394PW | 功能描述:热插拔功率分布 Hot Swap Power Mgr RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2394PWR | 功能描述:热插拔功率分布 Hot Swap Power Mgr RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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