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参数资料
| 型号： | TPS2393APWRG4 |
| 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： | 15/30页 |
| 文件大小： | 665K |
| 代理商： | TPS2393APWRG4 |
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TPS2393A
SLUS610 JULY 2004
22
www.ti.com
APPLICATION INFORMATION
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 (9) 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 (10) and (11) 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 (9), the bottom resistors in the dividers (R2 and R8 in
Figure 27b) can be found from equation (12).
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
TPS2393A. 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.
(10)
(11)
(12)
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| TPS2393DBTR | 功能描述:热插拔功率分布 Full Featured -48V Industral Temp. 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 |
| TPS2393DBTRG4 | 功能描述:热插拔功率分布 -48V Hot Swap G179 Pwr Mgr Ind Temp 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 |
| TPS2393EVM | 功能描述:电源管理IC开发工具 Simple -48V Hot Swap Contr EVM 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 |
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