参数资料
型号: TPS54240DGQ
厂商: TEXAS INSTRUMENTS INC
元件分类: 稳压器
英文描述: SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
封装: GREEN, PLASTIC, MSOP-10
文件页数: 8/48页
文件大小: 1759K
代理商: TPS54240DGQ
SS /TR
TPS54240
EN
PWRGD
SS /TR
EN
PWRGD
EN1
PWRGD1
VOUT1
VOUT2
SLVSAA6 – APRIL 2010
www.ti.com
DETAILED DESCRIPTION (continued)
Overload Recovery Circuit
The TPS54240 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
382mA 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 30 using two TPS54240 devices. The power good is
coupled to the EN pin on the TPS54240 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 31 shows the results of Figure 30.
Figure 30. Schematic for Sequential Start-Up
Figure 31. Sequential Startup using EN and
Sequence
PWRGD
16
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54240
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TPS54240DGQ 制造商:Texas Instruments 功能描述:IC STEP-DOWN DC/DC CONVERTER MSOP-10
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