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參數(shù)資料
| 型號： | TPS53124RGET |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, PQCC24 |
| 封裝： | GREEN, PLASTIC, QFN-24 |
| 文件頁數(shù)： | 2/22頁 |
| 文件大?。?/td> | 656K |
| 代理商： | TPS53124RGET |
Current Protection
10
TRIP
V
( mV )
R
( k
)
( A )
m
=
W
(1)
1
2
IN
OUT
TRIP
RIPPLE
TRIP
OCP
DS ( on )
IN
(V
V
) V
V
I
V
I
R
L
f
V
-
=
+
=
+
(2)
Over/Under Voltage Protection
UVLO Protection
Thermal Shutdown
SLUS825B – FEBRUARY 2008 – REVISED MAY 2008 ..................................................................................................................................................... www.ti.com
TPS53124 has cycle-by-cycle over current limiting control. The inductor current is monitored during the ‘OFF’
state and the controller keeps the OFF state during the inductor current is larger than the over-current trip level.
In order to provide both good accuracy and cost effective solution, TPS53124 supports temperature
compensated MOSFET RDS(on) sensing. TRIPx pin should be connected to GND through the trip voltage setting
resistor, RTRIP. TRIPx terminal sources 10-A ITRIP current at the ambient temperature and the trip level is set to
the OCL trip voltage VTRIP as below:
The trip level should be in the range of 30 mV to 200 mV over all operational temperature. The inductor current is
monitored by the voltage between PGNDx pin and LLx pin. ITRIP has 4000ppm/°C temperature slope to
compensate the temperature dependency of the RDS(on). PGNDx is used as the positive current sensing node so
that PGNDx should be connected to the source terminal of the bottom MOSFET.
As the comparison is done during the OFF state, VTRIP sets valley level of the inductor current. Thus, the load
current at over-current threshold, IOCP, can be calculated as follows:
In an over-current condition, the current to the load exceeds the current to the output capacitor; thus the output
voltage tends to fall off. Eventually, it will end up with crossing the under voltage protection threshold and
shutdown.
TPS53124 monitors a resistor divided feedback voltage to detect over and under voltage. When the feedback
voltage becomes higher than 115% of the target voltage, the OVP comparator output goes high and the circuit
latches as the high-side MOSFET driver OFF and the low-side MOSFET driver ON.
When the feedback voltage becomes lower than 70% of the target voltage, the UVP comparator output goes
high and an internal UVP delay counter begins counting. After 30
s, TPS53124 latches OFF both top and
bottom MOSFET drivers, and shut off both drivers of another channel. This function is enabled approximately 2.0
ms.
TPS53124 has V5FILT Under Voltage Lock Out protection (UVLO). When the V5FILT voltage is lower than
UVLO threshold voltage TPS53124 is shut off. This is non-latch protection.
TPS53124 monitors the temperature of itself. If the temperature exceeds the threshold value (typically 150
°C),
the switchers will be shut off as both DRVH and DRVL at low, the output discharge function enabled. Then
TPS53124 is shut off. This is non-latch protection.
10
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS53124
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| TPS53124RGETG4 | 功能描述:DC/DC 開關(guān)控制器 Dual Synch Step-Down Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS53125 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS |
| TPS53125EVM-599 | 功能描述:電源管理IC開發(fā)工具 Dual Synch Step-Down Controller Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS53125PW | 功能描述:DC/DC 開關(guān)控制器 Dual Synch Step-Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS53125PWR | 功能描述:DC/DC 開關(guān)控制器 Dual Synch Step-Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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