參數(shù)資料
型號(hào)： TPS24720RGTR
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16
封裝： 3 X 3 MM, GREEN, PLASTIC, QFN-16
文件頁(yè)數(shù)： 8/37頁(yè)
文件大?。?/td> 2258K
代理商： TPS24720RGTR
SLVSAL1B
– MARCH 2011 – REVISED MAY 2011
Figure 29. Inrush Mode at Hot-Swap Circuit Insertion
INRUSH OPERATION
When the TPS24720 activates the MOSFET M1, a current flows into the downstream bulk storage capacitors.
When this current exceeds the limit set by the power-limit engine, the gate of the MOSFET is regulated by a
feedback loop to make the MOSFET current rise in a controlled manner. This not only limits the
capacitor-charging inrush current but it also limits the power dissipation of the MOSFET to safe levels. A more
complete explanation of the power-limiting scheme is given in the section entitled Action of the Constant Power
Engine. At the instant when the current in RSENSE reaches the programmed limit, the TIMER pin begins to charge
the timing capacitor CT with a current of approximately 10 A. The TIMER pin continues to charge CT until
V(GATE – VCC) reaches the timer activation voltage (6 V for VVCC = 12 V). The TIMER then begins to discharge CT
with a current of approximately 10
A. This indicates that the inrush mode is finished. If the TIMER exceeds its
upper threshold of 1.35 V before V(GATE – VCC) reaches the timer activation voltage, the GATE pin is pulled to
GND and the hot-swap circuit enters either latch mode or auto-retry mode, depending upon the status of the
LATCH pin (see LATCH in Detailed Pin Descriptions).
The power limit feature is disabled once the inrush operation is finished and the hotswap circuit becomes a
circuit breaker. The TPS24720 will turn off the MOSFET M1 after a fault timer period once the load exceeds the
current limit threshold.
ACTION OF THE CONSTANT-POWER ENGINE
Figure 30 illustrates the operation of the constant-power engine during start-up. The circuit used to generate the
waveforms of Figure 30 was programmed to a power limit of 29.3 W by means of the resistor connected between
PROG and GND. At the moment current begins to flow through the MOSFET, a voltage of 12 V appears across
it (input voltage VVCC = 12 V), and the constant-power engine therefore allows a current of 2.44 A (equal to 29.3
W divided by 12 V) to flow. This current increases in inverse ratio as the drain-to-source voltage diminishes, so
as to maintain a constant dissipation of 29.3 W. The constant-power engine adjusts the current by altering the
reference signal fed to the current limit amplifier. The lower part of Figure 31 shows the measured power
16
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): TPS24720
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