參數(shù)資料
型號(hào): TPS54240QDGQRQ1
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩(wěn)壓器
英文描述: 2.5 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
封裝: GREEN, PLASTIC, MSOP-10
文件頁(yè)數(shù): 9/48頁(yè)
文件大小: 1447K
代理商: TPS54240QDGQRQ1
EN
SS/TR
V
SENSE
VOUT
SLVSAQ4A
– DECEMBER 2010 – REVISED APRIL 2011
DETAILED DESCRIPTION (continued)
Figure 30. Operation of SS/TR Pin when Starting
Overload Recovery Circuit
The TPS54240-Q1 has an overload recovery (OLR) circuit. The OLR circuit will slow start the output from the
overload voltage to the nominal regulation voltage once the fault condition is removed. The OLR circuit will
discharge the SS/TR pin to a voltage slightly greater than the VSENSE pin voltage using an internal pull down of
382
μA when the error amplifier is changed to a high voltage from a fault condition. When the fault condition is
removed, the output will slow start from the fault voltage to nominal output voltage.
Sequencing
Many of the common power supply sequencing methods can be implemented using the SS/TR, EN and PWRGD
pins. The sequential method can be implemented using an open drain output of a power on reset pin of another
device. The sequential method is illustrated in Figure 31 using two TPS54240-Q1 devices. The power good is
coupled to the EN pin on the TPS54240-Q1 which will enable the second power supply once the primary supply
reaches regulation. If needed, a 1nF ceramic capacitor on the EN pin of the second power supply will provide a
1ms start up delay. Figure 32 shows the results of Figure 31.
Copyright
2010–2011, Texas Instruments Incorporated
17
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