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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

  • 348.00KB

  • 38頁(yè)

  • TI

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TPS40074
SLUS617 鈥?APRIL 2005
APPLICATION INFORMATION (continued)
VIN
VIN
SW
V
PEAK
COMP
RAMP
t
ON1
t
d
+
ON
T
T
1
t
ON2
T
2
SW
RAMP
COMP
V
VALLEY
t
ON1
> t
ON2
and d
1
> d
2
VDG鈭?3172
Figure 9. Voltage Feed-Forward and PWM Duty Cycle Waveforms
PROGRAMMING SOFT START
TPS40074 uses a closed-loop approach to ensure a controlled ramp on the output during start-up. Soft-start is
programmed by connecting an external capacitor (C
SS
) from the SS pin to GND. This capacitor is charged by a
fixed current, generating a ramp signal. The voltage on SS is level shifted down approximately 1 V and fed into a
separate non-inverting input to the error amplifier. The loop is closed on the lower of the level shifted SS voltage
or the 700-mV internal reference voltage. Once the level shifted SS voltage rises above the internal reference
voltage, output voltage regulation is based on the internal reference. To ensure a controlled ramp-up of the
output voltage the soft-start time should be greater than the L-C
OUT
time constant or:
t
START
w
2p
L
C
OUT
(seconds)
(5)
where
鈥?/div>
L is the value of the filter inductor
鈥?/div>
C
OUT
is the value of the output capacitance
鈥?/div>
t
START
is the output ramp up-time
For a desired soft-start time, the soft-start capacitance, C
SS
, can be found from:
I
C
SS
t
SS
+
SS
V
FB
(6)
Please note: There is a direct correlation between t
START
and the input current required during start-up. The lower
t
START
is, the higher the input current required during start-up since the output capacitance must be charged
faster.
PROGRAMMING SHORT CIRCUIT PROTECTION
The TPS40074 uses a two-tier approach to short circuit protection. The first tier is a pulse-by-pulse protection
scheme. Short circuit protection is implemented by sensing the voltage drop across the high-side MOSFET while
it is turned on. The MOSFET drain to source voltage is compared to the voltage dropped across a resistor (R
ILIM
)
connected from VDD to the ILIM pin. The voltage drop across this resistor is produced by a constant current sink.
If the voltage drop across the MOSFET exceeds the voltage drop across the ILIM resistor the switching pulse is
immediately terminated. The MOSFET remains off until the next switching cycle is initiated.
13

TPS40074 PDF文件相關(guān)型號(hào)

TPS40100,TPS40222,TPS5130

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