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參數(shù)資料
| 型號(hào)： | TPS3513DR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 封裝： | GREEN, PLASTIC, MS-012AB, SOIC-14 |
| 文件頁數(shù)： | 16/19頁 |
| 文件大?。?/td> | 489K |
| 代理商： | TPS3513DR |
SLVS313B – FEBRUARY 2001 – REVISED SEPTEMBER 2010
www.ti.com
The TPS3513 family of power-supply supervisors provides a power-good output (PGO) for the 3.3-V and 5-V
supply voltage rails and a separate power-good input (PGI). An internal timer is used to generate a 300-ms
power-good delay.
If the voltage signals at PGI, VS33, and VS5 rise above the undervoltage threshold, the open-drain, power-good
output (PGO) will go high after a delay of 300 ms. When the PGI voltage or any of the 3.3-V, 5-V rail drops below
the undervoltage threshold, PGO will be disabled immediately.
Power-Supply Remote On/Off (PSON) and Fault Protect Output (FPO)
Since the latest personal computer generation focuses on easy turnon and power saving functions, the PC power
supply will require two characteristics. One is a dc power supply remote on/off function; the other is standby
voltage to achieve very low power consumption of the PC system. Thus, the main power needs to be shut down.
The power supply remote on/off (PSON) is an active-low signal that turns on all of the main power rails including
the 3.3-V, 5-V, -5-V, and -12-V power rails. When this signal is held high by the PC motherboard or left open
circuited, the signal of the fault protect output (FPO) also goes high. Thus, the main power rails should not
deliver current and should be held at 0 V.
When the FPO signal is held high due to an occurring fault condition, the fault status will be latched and the
outputs of the main power rails should not deliver current and should be held at 0 V. Toggling the power-supply
remote on/off (PSON) from low-to-high will reset the fault-protection latch. During this fault condition only the
standby power is not affected.
When PSON goes from high to low or low-to-high, the 38-ms debounce block will be active to avoid that a glitch
on the input will disable/enable the FPO output. During this period, the undervoltage function is disabled to
prevent turnon failure.
Power should be delivered to the rails only if the PSON signal is held at ground potential, thus, FPO is active
low. The FPO pin can be connected to 5 VDC (or up to 15 VDC) through a pullup resistor.
Under-Voltage Protection
The TPS3513 provides undervoltage protection (UVP) for the 12-V rail and undervoltage detect for the 3.3-V and
5-V rails. When an undervoltage condition appears at the VS12 input pin for more than 150 s, the FPO output
goes high and PGO goes low. Also, this fault condition will be latched until PSON is toggled from low-to-high or
VDD is removed.
In flyback or forward type off-line switching power supplies, usually designed for small power, the overload
protection design is very simple. Most of these type of power supplies are only sensing the input current for an
overload condition. The trigger-point needs to be set much higher than the maximum load in order to prevent
false turnon.
However, this will cause one critical issue. In case that the connected load is larger than the maximum allowable
load but smaller than the trigger-point, the system will always become over-heated and cause failure and
damage.
Overcurrent Protection
In bridge or forward type, off-line switching power supplies, usually designed for medium to large power, the
overload protection design needs to be very precise. Most of these types of power supplies are sensing the
output current for an overload condition. The trigger-point needs to be set higher than the maximum load in order
to prevent false turnon.
The TPS3513 provides overcurrent protection (OCP) for the 3.3-V, 5-V, and 12-V rails. When an over current
condition appears at the OCP comparator input pins for more than 73 s, the FPO output goes high and PGO
goes low. Also, this fault condition will be latched until PSON is toggled from low-to-high or VDD is removed.
The resistor connected between the RI pin and the GND pin will introduce an accurate I(ref) for the OCP function.
Of course, a more accurate resistor tolerance will be better. The formula for choosing the RI resistor is V(RI)/I(ref).
The I(ref) range is from 12.5 A to 62.5 mA. Three OCP comparators and the I(ref) section are supplied by VS12.
Current drawn from the VS12 pin is less than 1 mA.
Following is an example on calculating OCP for the 12-V rail:
RI = V(RI)/I(ref) = 1.15 V/20 A = 56 k
6
Copyright 2001–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS3513
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| TPS3513DRG4 | 功能描述:監(jiān)控電路 3Ch Super With Over- Current Detect RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| TPS3513N | 功能描述:監(jiān)控電路 3-Ch Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| TPS3513NE4 | 功能描述:監(jiān)控電路 3Ch Super With Over- Current Detect RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| TPS3514 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:PC POWER-SUPPLY SUPERVISORS |
| TPS3514D | 功能描述:監(jiān)控電路 3Ch Super With Over- Current Detect RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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