參數(shù)資料
型號(hào)： TPS40180RGER
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 0.05 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC24
封裝： GREEN, PLASTIC, VQFN-24
文件頁(yè)數(shù)： 14/52頁(yè)
文件大?。?/td> 1291K
代理商： TPS40180RGER
www.ti.com
Hiccup Fault Recovery
SS
SW NODE
VOUT
COMP
ILIM
V
VDD
1.5 V
0.5 V
GND
VIN
GND
VOUT, REG
GND
t0 t1 t2
t3
(A)
(B)
(C)
(D)
UDG-07024
SLVS753B – FEBRUARY 2007 – REVISED NOVEMBER 2007
To reduce the input current and component dissipation during on overcurrent event, a hiccup mode is
implemented. Hiccup mode refers to a sequence of 7 soft-start cycles where no MOSFET switching occurs, and
then a re-start is attempted. If the fault has cleared, the re-start results in returning to normal operation and
regulation. This is shown in Figure 26.
Figure 26. Hiccup Recovery From Faults
Normal operation is occurring between t0 and t1 as shown by VOUT at the regulated voltage, (C) and normal
switching on the SW NODE (B) and COMP at its nominal level, (D). At t1, an overcurrent load is experienced.
The increased current forces COMP to increase to the ILIM level as shown in (D). If the COMP voltage is above
the ILIM voltage for 7 switching cycles, the controller enters a hiccup mode at t2. During this time the controller is
not switching and the power MOSFETs are turned off. The SS pin goes through 7 cycles of charging and
discharging the soft-start capacitor. At the end of the 7 cycles the controller attempts another normal re-start. If
the fault has been cleared, the output voltage comes up to the regulation level as shown at time t3. If the fault
has not cleared, the COMP voltage again rises above the ILIM voltage and a fresh hiccup cycle starts. This
condition may continue indefinitely.
The pre-bias circuitry is reset at this time and the restart does not discharge an output pre-bias condition if it
exists.
Copyright 2007, Texas Instruments Incorporated
21
Product Folder Link(s): TPS40180
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