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| 型号： | TPS40021PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.01 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 4/36页 |
| 文件大小： | 724K |
| 代理商： | TPS40021PWP |
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TPS40020
TPS40021
SLUS535D MARCH 2003 REVISED JULY 2007
www.ti.com
12
APPLICATION INFORMATION
Figure 4 shows the behavior of key signals during initial startup, during a fault and a successfully fault recovery.
At time t0, power is applied to the converter. The voltage on the soft-start capacitor (VCSS) begins to ramp up
At t1, the soft-start period is over and the converter is regulating its output at the desired voltage level. From
t0 to t1, pulse-by-pulse current limiting was in effect, and from t1 onward, overcurrent pulses are counted for
purposes of determining if a fault exists. At t2, a heavy overload is applied to the converter. This overload is
in excess of the overcurrent threshold, the converter starts limiting current and the output voltage falls to some
level depending on the overload applied. During the period from t2 to t3, the counter is counting overcurrent
pulses and at time t3 reaches a full count of 7. The soft-start capacitor is then discharged, the outputs are
disabled, the counter decremented, and a fault condition is declared.
VCSS
VOUT
ILOAD
UDG03187
t
9 1.3 V
FAULT
VDD
9 0.6 V
cycles
t0
t1
t2 t3
t10
0
6
5
4
3
2
1
0
t4
t5
t6
t7
t8
t9
1
2
3
4
5
6
7
0.6 V
Counter
Figure 4. Overcurrent/Fault Waveforms
When the soft-start capacitor is fully discharged, it begins charging again at the same rate that it does on startup,
with a nominal 3-
A current source. As the capacitor voltage reaches full charge, it is discharged again and the
counter is decremented by one count. These transitions occur at t3 through t9. At t9, the counter has been
decremented to zero. Now the fault logic is cleared, the outputs are enabled and the converter attempts to
restart with a full soft-start cycle. The converter comes into regulation at t10.
The internal SS signal is a diode drop below VCSS. When VCSS reaches one diode drop above ground, (0.6 V)
the output (VOUT) begins it’s soft-start ramp.
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