參數(shù)資料
型號： TPS40074RHLRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC20
封裝： GREEN, PLASTIC, QFN-20
文件頁數(shù)： 6/41頁
文件大?。?/td> 765K
代理商： TPS40074RHLRG4
www.ti.com
t
START v
D
MIN
f
SW
10*7
ms
(7)
PROGRAMMING SHORT CIRCUIT PROTECTION
ILIM Threshold
T2
T1
ILIM Threshold
T3
T1
ILIM
SW
VIN 2V
UDG03173
Overcurrent
(A)
(B)
SLUS617B – APRIL 2005 – REVISED OCTOBER 2006
APPLICATION INFORMATION (continued)
where
DMIN is the minimum operating duty cycle
fSW is the converter switching frequency
Please note: There is a direct correlation between tSTART and the input current required during start-up. The
lower tSTART is, the higher the input current required during start-up since the output capacitance must be
charged faster.
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 (RILIM)
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.
In addition, just prior to the high-side MOSFET turning on, the ILIM pin is pulled down to approximately half of
VDD. The ILIM pin is allowed to return to its nominal value after one of two events occur:
1. The SW node rises to within approximately 2 V of VDD
2. An internal timeout occurs, approximately 125-ns after ILIM is initially pulled down
If the SW node rises to within approximately 2-V of VDD, the device allows ILIM to go back to its nominal value.
This is illustrated in Figure 10 A. T1 is the delay time from the internal PWM signal being asserted and the rise
of SW. This includes the driver delay of 50 ns typical, and the turn on time of the high-side MOSFET. The
MOSFET used should have a turn on time less than 75 ns. T2 is the reaction time of the sensing circuit that
allows ILIM to start to return to its nominal value, typically 20ns.
Figure 10. Switching and Current Limit Waveforms and Timing Relationship
14
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相關代理商/技術參數(shù)
參數(shù)描述
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