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參數(shù)資料
| 型號： | TPS51511RHLT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | ROHS COMPLIANT, PLASTIC, QFN-20 |
| 文件頁數(shù)： | 7/29頁 |
| 文件大小： | 1019K |
| 代理商： | TPS51511RHLT |
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Current Protection for VOSW
V
TRIP(mV) + RTRIP(kW)
10(mA)
(4)
IN
OUT
IN
)
ON
(
DS
TRIP
RIPPLE
)
ON
(
DS
TRIP
OCP
V
)
V
(
f
L
2
1
R
V
2
I
R
V
I
-
+
=
+
=
(5)
Over/Under Voltage Protection for VOSW
V5IN UVLO Protection
LDO Operation
Thermal Shutdown
Dynamic Voltage Step, OD and ODOFF
SLVS735A – FEBRUARY 2007 – REVISED APRIL 2007
The switcher has cycle-by-cycle current-limit control. The inductor current is monitored during the OFF state, and
the controller keeps the OFF state while the inductor current is larger than the overcurrent trip level. The trip
level and current-sense scheme are determined by the CS pin connection (see Current Sensing Scheme). In the
resistor sensing scheme, the trip level, VTRIP, is a fixed value of 60 mV. In the RDS(ON) sensing scheme, the CS
terminal sinks 10
A and the trip level is set to the voltage across the R
TRIP resistor.
Because the comparison is done during the OFF state, VTRIP sets the valley level of the inductor current. Thus,
the load current at the overcurrent threshold, Iocp, can be calculated as follows;
In an overcurrent condition, the current to the load exceeds the current to the output capacitor, thus the output
voltage tends to fall. If the output voltage becomes less than power-good level, the VTRIP level is cut in half, and
the output voltage tends to be even lower. Eventually, it will end up crossing the undervoltage-protection
threshold and be shut down.
The TPS51511 monitors the feedback voltage to detect overvoltage and undervoltage conditions. When the
feedback voltage becomes higher than 115% of the target voltage, the OVP comparator output goes high, and
the circuit latches the top MOSFET driver OFF and the bottom MOSFET driver ON. The TPS51511 also
monitors the VOSW voltage directly, and if it becomes greater than 4 V, TPS51511 turns off the top MOSFET
driver. When the feedback voltage becomes lower than 70% of the target voltage, the UVP-comparator output
goes high, and an internal UVP delay counter starts. After 32 switching cycles, the TPS51511 latches OFF both
top and bottom MOSFETs. This function is enabled after 1007 cycles from switcher startup to ensure proper
startup.
TPS51511 has V5IN under voltage lock out protection (UVLO). When the V5IN voltage is lower than the UVLO
threshold voltage, the switcher and LDO are shut off. This is a non-latching protection.
The TPS51511 integrated LDO is a source-only 2- A LDO. It has a typical current limit of 2.5 A . It can be
separately enabled via the ENLDO pin, and the output voltage is set via the external voltage divider. Only a 20
F ceramic capacitor (2×10F) is needed for this LDO. The transient response is very fast due to the wide
bandwidth design of the LDO feedback loop.
The LDO has an internally fixed constant overcurrent limit of 2.5 A. This is a trailing current limit with no
shutdown function.
The TPS51511 monitors its internal temperature. If the temperature exceeds the threshold value (typically
160
°C), the switcher and LDO are shut off. This is a non-latching protection, and operation is resumed when the
device is cooled down by approximately 10
°C.
OD and ODOFF are multifunction pins. By connecting the OD pin through a resistor to VSWFB, ODOFF is
connected to an external control logic signal which can control OD to switch in and out this resistor in parallel
with the bottom resistor of the voltage divider. This can dynamically change the switcher output voltage during
operation. If the application requires a power-good signal for the LDO rather than switcher dynamic voltage
control, OD and ODOFF can be configured to support the LDO power-good feature by connecting ODOFF to
VLDOFB. In this mode, connect OD through a pullup resistor to the bias voltage (i.e. 5 V, 3.3 V) to act as the
LDO power-good output. The functions of ODOFF and OD pin combinations related to the ENLDO and ENSW
pin voltage levels are shown in Table 1.
15
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS51511RHLTG4 | 功能描述:DC/DC 開關(guān)控制器 Synch Switcher 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 |
| TPS51513 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SINGLE PHASE D-CAP+ SYNCHRONOUS BUCK CONTROLLER WITH INTEGRATED DRIVERS FOR GENERAL IC VCORE APPLICATIONS |
| TPS51513EVM-549 | 功能描述:電源管理IC開發(fā)工具 TPS51513EVM-549 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 |
| TPS51513EVM-549 | 制造商:Texas Instruments 功能描述:DEVELOPMENT TOOL |
| TPS51513RHB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SINGLE PHASE D-CAP+ SYNCHRONOUS BUCK CONTROLLER WITH INTEGRATED DRIVERS FOR GENERAL IC VCORE APPLICATIONS |
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