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參數(shù)資料
| 型號： | TPS53353DQPT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO22 |
| 封裝： | 5 X 6 MM, ROHS COMPLIANT, PLASTIC, SON-22 |
| 文件頁數(shù)： | 10/25頁 |
| 文件大?。?/td> | 556K |
| 代理商： | TPS53353DQPT |
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=
W
m
TRIP
V
mV
R
k
I
A
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-
=
+
=
+
IND(ripple)
IN
OUT
TRIP
OCP
SW
IN
DS(on)
I
V
1
I
2
L
f
V
32
R
32
R
SLUSAK2
– AUGUST 2011
Current Sense, Overcurrent and Short Circuit Protection
TPS53353 has cycle-by-cycle overcurrent limiting control. The inductor current is monitored during the OFF state
and the controller maintains the OFF state during the period in that the inductor current is larger than the
overcurrent trip level. In order to provide both good accuracy and cost effective solution, TPS53353 supports
temperature compensated MOSFET RDS(on) sensing. The TRIP pin should be connected to GND through the trip
voltage setting resistor, RTRIP. The TRIP terminal sources current (ITRIP) which is 10 μA typically at room
(2)
The inductor current is monitored by the LL pin. The GND pin is used as the positive current sensing node and
the LL pin is used as the negative current sense node. The trip current, ITRIP has 4700ppm/°C temperature slope
to compensate the temperature dependency of the RDS(on).
As the comparison is made during the OFF state, VTRIP sets the valley level of the inductor current. Thus, the
(3)
In an overcurrent or short circuit condition, the current to the load exceeds the current to the output capacitor
thus the output voltage tends to decrease. Eventually, it crosses the undervoltage protection threshold and shuts
down. After a hiccup delay (16 ms with 0.7 ms sort-start), the controller restarts. If the overcurrent condition
remains, the procedure is repeated and the device enters hiccup mode.
Overvoltage and Undervoltage Protection
TPS53353 monitors a resistor divided feedback voltage to detect over and under voltage. 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 1ms, TPS53353 latches OFF both high-side and low-side MOSFETs
drivers. The controller restarts after a hiccup delay (16 ms with 0.7 ms soft-start). This function is enabled 1.5-ms
after the soft-start is completed.
When the feedback voltage becomes higher than 120% of the target voltage, the OVP comparator output goes
high and the circuit latches OFF the high-side MOSFET driver and latches ON the low-side MOSFET driver. The
output voltage decreases. If the output voltage reaches UV threshold, then both high-side MOSFET and low-side
MOSFET driver will be OFF and the device restarts after a hiccup delay. If the OV condition remains, both
high-side MOSFET and low-side MOSFET driver remains OFF until the OV condition is removed.
UVLO Protection
The TPS53353 uses VREG undervoltage lockout protection (UVLO). When the VREG voltage is lower than 3.95
V, the device shuts off. When the VREG voltage is higher than 4.2V, the device restarts. This is a non-latch
protection.
Thermal Shutdown
TPS53353 monitors the temperature of itself. If the temperature exceeds the threshold value (typically 145
°C),
TPS53353 is shut off. When the temperature falls about 10
°C below the threshold value, the device will turn back
on. This is a non-latch protection.
18
Copyright
2011, Texas Instruments Incorporated
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS53353DQPT | 制造商:Texas Instruments 功能描述:SYNCHRONOUS BUCK CONV 20A QFN22 制造商:Texas Instruments 功能描述:SYNCHRONOUS BUCK CONV, 20A, QFN22, Primary Input Voltage:15V, No. of Outputs:1, 制造商:Texas Instruments 功能描述:SYNCHRONOUS BUCK CONV, 20A, QFN22, Primary Input Voltage:15V, No. of Outputs:1, Output Voltage:5.5V, Output Current:20A, No. of Pins:22, Operating Temperature Min:-40C, Operating Temperature Max:85C, MSL:- , RoHS Compliant: No |
| TPS53353EVM-744 | 功能描述:電源管理IC開發(fā)工具 HI-EFF,20A,SYNC BUCK CONVERTER RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS53355 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High-Efficiency 30-A Synchronous Buck Converter with Eco-modea?￠ |
| TPS53355DQPR | 功能描述:直流/直流開關調節(jié)器 HI-EFF,30A,SYNC BUCK CONVERTER RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS53355DQPT | 功能描述:直流/直流開關調節(jié)器 HI-EFF,30A,SYNC BUCK CONVERTER RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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