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| 型号： | TPS51727RHATG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封装： | 6 X 6 MM, GREEN, PLASTIC, QFN-40 |
| 文件页数： | 19/42页 |
| 文件大小： | 0K |
| 代理商： | TPS51727RHATG4 |
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PWRMON
PWR
DAC
CS
V
K
V
=
(5)
SLUS806B – APRIL 2008 – REVISED JANUARY 2009 ..................................................................................................................................................... www.ti.com
Current Protection
Two types of current protection are provided in the TPS51727.
Overcurrent protection (OCP)
Negative overcurrent protection
Overcurrent Protection (OCP)
The TPS51727 uses a valley current limiting scheme, so the OCP set point is the OCP limit minus half of the
ripple current. Current limiting occurs on a phase-by-phase and pulse-by-pulse basis. If the sensed current value
is above the OCP setting, the converter holds off the next ON pulse until the current ramp drops below the OCP
limit. Refer to the Electrical Characteristics table to choose the appropriate TRIPSEL value.
In OCP, the voltage droops until the UVP limit is reached. Then, the converter sets PGOOD signal inactive,
performs the soft-stop sequence, and then latches OFF. The converter remains in this state until the device is
reset.
Negative Overcurrent Protection
The negative OCP circuit acts when the converter is sinking current. The converter continues to act in a valley
mode, so to have a similar negative DC limit, the absolute value of the negative OCP set point is typically 50%
higher than the positive OCP set point.
Thermal Protection
Two types of thermal protection are provided in the TPS51727
Thermal flag open drain ouptut signal (THAL)
Thermal shutdown
Thermal Flag Open Drain Ouptut Signal THAL
The THAL signal is an open-drain signal that is used to protect the VOUT power chain. To use THAL, place an
NTC thermistor at the hottest area of the PC board and connect it to the THRM pin. THRM sources a precise
60-
A current, and THAL goes LO when the voltage on THRM reaches 0.72 V. Therefore, the NTC thermistor
needs to be 11.7 k
at the trip level. A series or parallel resistor can be used to trim the resistance to the desired
value at the trip level.
THAL causes the processor to draw less current. The TPS51727 continues to operate normally.
Thermal Shutdown
The TPS51727 includes an internal temperature sensor. When the temperature reaches a nominal 160°C, the
device shuts down until the temperature cools approximately 10°C and the EN pin or 5-V power is recycled.
Power Monitor
The TPS51727 includes a power monitor function. The power monitor puts out an analog voltage proportional to
the output power on the PMON pin.
In Equation 5 KPWR is given in the Electrical Characteristics table and Σ VCS is the sum of the voltages at the
inputs to the current sense amplifiers.
Power Sequencing
The TPS51727 is not sensitive to power sequencing if the EN pin comes up after all other voltages have settled.
If EN is tied to 3.3 V without being controlled by a logic signal, 5 V must come up first. The VID lines must be
valid within 10
s of the time when EN goes high.
26
Copyright 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): TPS51727
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