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TPS40074 Datasheet

  • TPS40074

  • 具有電壓前饋的中等范圍輸入同步降壓控制器

  • 38頁

  • TI

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TPS40074
SLUS617 鈥?APRIL 2005
APPLICATION INFORMATION (continued)
MOSFETs off. Seven soft-start cycles are initiated (without activity on the HDRV and LDRV outputs) and the
PWM is disabled during this period. The counter is decremented on each soft-start cycle. When the counter is
decremented to zero the PWM is re-enabled and the controller attempts to restart. If the fault has been removed
the output starts up normally. If the output fault is still present the counter counts seven overcurrent pulses and
re-enters the second tier fault mode. Refer to
Figure 11
for typical fault protection waveforms.
The minimum short circuit limit threshold (I
SCP
) depends on t
START
, C
OUT
, V
OUT
, and the load current at turn-on
(I
LOAD
).
C
V
OUT
I
SCP
u
OUT
)
I
LOAD
(A)
t
START
(7)
The short circuit limit programming resistor (R
ILIM
) is calculated from:
I
SCP
R
DS(onMAX)
)
V
ILIM (ofst)
R
ILIM
+
W
I
ILIM
where
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
I
ILIM
is the current into the ILIM pin (135 碌A(chǔ) typical)
V
ILIM(ofst)
is the offset voltage of the ILIM comparator (-30 mV typical)
I
SCP
is the short-circuit protection current
R
DS(on)MAX
is the drain-to-source resistance of the high-side MOSFET
(8)
To find the range of the short circuit threshold values use the following equations.
I
ILIM(max)
R
ILIM
)
50 mV
I
SCP(max)
+
A
R
DS(onMIN)
I
SCP(min)
+
I
ILIM(min)
R
ILIM
)
10 mV
R
DS(onMAX)
A
(9)
(10)
The ILIM capacitor maximum value can be found from:
V
OUT
0.2
C
ILIM(max)
+
(Farads)
V
IN
R
ILIM
f
SW
(11)
Note that this is a recommended maximum value. If a smaller value can be used, it should be to improve
protection. For most applications, consider using half the maximum value shown in
Equation 11.
15

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