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| 型号： | TPS2393PWRG4 |
| 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： | 15/33页 |
| 文件大小： | 596K |
| 代理商： | TPS2393PWRG4 |
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TPS2392
TPS2393
SLUS536C AUGUST 2002 REVISED AUGUST 2004
www.ti.com
22
APPLICATION INFORMATION
With this information, the minimum recommended value timing capacitor CFLT can be determined. The delay
time needed will be either tSS or the sum of tSS and tCC, according to the estimated time to charge the load.
Since fault timing is generated by the constant-current charging of CFLT, the capacitor value is determined by
equation (6) or (7).
C
FLT(min) +
55
t
SS
3.75
C
FLT(min) +
55
t
SS ) tCC
3.75
where:
D CFLT(min) is the recommended capacitor value, in microfarads
D tSS is the result of equation (3), in seconds
D tCC is the result of equation (5), in seconds
For the typical application example, with the 100-
F filter capacitor in front of the dc-to-dc converter, equations
(3) and (4) estimate the load voltage ramping to 46 V during the soft-start period. If the module should operate
down to 72-V input supply, approximately another 1.58 ms of constant-current charging may be required.
Therefore, equation (7) is used to determine CFLT(min), and the result is approximately 0.1 F.
setting the undervoltage and overvoltage thresholds
The UVLO and OVLO pins can be used to set the undervoltage (VUV) and overvoltage (VOV) thresholds of the
hot swap circuit. When the input supply is below VUV or above VOV, the GATE pin is held low, disconnecting
power from the load, and deasserting the PG output. When input voltage is within the UV/OV window, the GATE
drive is enabled, assuming all other input conditions are valid for turn-on.
Threshold hysteresis is provided via two internal sources which are switched to either pin whenever the
corresponding input level exceeds the internal 1.4-V reference. The additional bias shifts the pin voltage in
proportion to the external resistance connected to it. This small voltage shift at the device pin is gained up by
the external divider to input supply levels.
UDG20119
R8
R2
R1
R7
GND
48V
GND
48V
VIN
RTN
TPS2392/93*
UVLO
OVLO
VIN
RTN
TPS2392/93*
UVLO
OVLO
R1
200 k
1%
R2
4.99 k
1%
R3
3.92 k
1%
(a)
(b)
V
OV_L +
R1
) R2 ) R3
R3
V
REF * ISRC_UV
R1
V
UV_L +
R1
) R2 ) R3
R2
) R3
V
REF
V
OV_L +
R7
) R8
R8
V
TH_OV
V
UV_L +
R1
) R2
R2
V
TH_UV
*Additional details omitted for clarity. See block diagram on page 15 and 16 for pinout.
Figure 28. Programming the Undervoltage and Overvoltage Thresholds
(6)
(7)
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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 |
| TPS2398D | 制造商:Texas Instruments 功能描述: |
| TPS2398DGK | 功能描述:热插拔功率分布 -48V Hot Swap Controller 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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