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參數(shù)資料
| 型號(hào)： | TPS51315RGFT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | GREEN, PLASTIC, QFN-40 |
| 文件頁數(shù)： | 3/32頁 |
| 文件大小： | 1028K |
| 代理商： | TPS51315RGFT |
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RIPPLE
TRIP
OCL
I
V
I
7 m
2
=
-
W
÷
÷
è
è
TRIP
V
R
10 A
=
m
SLUS881A
– MAY 2009 – REVISED MAY 2011
Overcurrent Limit
The TPS51315 has cycle-by-cycle overcurrent limit function. The inductor current is monitored during the OFF
state using the low-side FET RDS(on) which is 7 m (typ). The controller maintains the OFF state and does not
release next ON cycle until the detected current comes down to the overcurrent trip level set by the TRIP
resister. Because of this scheme, RTRIP establishes the valley level of the inductor current. Note that the load
(4)
RTRIP value can be calculated by Equation 5, but cannot exceed 12.1-k to protect the internal FETs from
overloading.
(5)
Undercurrent Limit
The TPS51315 also supports a cycle-by-cycle undercurrent limit in PWM-Only mode. The undercurrent limit is
the negative value of the overcurrent limit. If the output voltage continues to rise, the lower MOSFET is always
on: thus, the inductor current reduces and reverses direction after it reaches zero (in PWM-Only mode). When
there is too much negative current through the inductor, the lower MOSFET is turned off and the current flows to
the VIN pin through the body diode of the upper MOSFET. Because there is less current with which to discharge
the output capacitor, output voltage tends to rise, eventually reaching the overvoltage protection threshold and
shutting down the TPS51315. In order to prevent triggering a false OVP shut down, the lower MOSFET is turned
on 400-ns after it is turned off. If the device reaches an undercurrent threshold again before the output voltage is
discharged to the target level, the lower MOSFET is turned off and the process repeats. This logic is called UCL
Buzz. It ensures maximum allowable discharge capability when the output voltage continues to rise. Alternatively,
if the output voltage is discharged to the target level before the UCL threshold is reached, the lower MOSFET is
turned off, the upper MOSFET is then turned on, and the device resumes normal operation.
Overvoltage Protection
The TPS51315 monitors a resistor-divided feedback voltage to detect overvoltage and undervoltage conditions.
When the feedback voltage becomes greater than 115% of the target value, the upper MOSFET is turned off and
the lower MOSFET is turned on immediately. The output is also discharged by the internal 20-
transistor if it is
connected to VOUT_DS.
The, TPS51315 monitors the output voltage directly. If it becomes greater than 5.75 V, TPS51315 turns off the
upper MOSFET driver. In no case should the device operate at more than 6 V, as damage would occur.
Undervoltage Protection
When the feedback voltage becomes lower than 70% of the target value, the undervoltage comparator output
goes high and an internal UVP delay counter begins to increment. After 32
μs, TPS51315 latches off both the
upper and lower MOSFETs and discharges the output with the internal 20-
transistor if it is connected to
VOUT_DS. This function is enabled after 2ms from when EN_PSV is brought high, i.e., UVP is disabled during
the start up.
UVLO Protection
The TPS51315 has V5FILT undervoltage lockout (UVLO) protection. When the V5FILT voltage is lower than
UVLO threshold voltage, TPS51315 is shut off. This protection is not latched.
Thermal Shutdown
The TPS51315 includes a die-temperature monitor function. If the temperature exceeds the threshold value
(typically 160
°C), TPS51315 shutd off. This protection is not latched. The device recovers once the temperature
has cooled to 148
°C.
Copyright
2009–2011, Texas Instruments Incorporated
11
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| TPS51317 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.3-V/5-V Input, 6-A, D-CAP+? Mode Synchronous Step-Down Integrated FETs Converter |
| TPS51317RGBR | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.3V/5Vin,6A,DCAP Mode Sync Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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| TPS51362RVER | 制造商:Texas Instruments 功能描述:22V INPUT, 10A INTEGRATED FET 制造商:Texas Instruments 功能描述:IC REG BUCK SYNC ADJ 10A 28VQFN |
| TPS51362RVET | 制造商:Texas Instruments 功能描述:22V INPUT, 10A INTEGRATED FET 制造商:Texas Instruments 功能描述:IC REG BUCK SYNC ADJ 10A 28VQFN |
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