參數(shù)資料
型號: TPS40050PWPRG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩(wěn)壓器
英文描述: 0.2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝: GREEN, PLASTIC, HTSSOP-16
文件頁數(shù): 6/36頁
文件大?。?/td> 648K
代理商: TPS40050PWPRG4
TPS40050
TPS40051
TPS40053
SLUS540F DECEMBER 2002 REVISED JUNE 2004
www.ti.com
14
APPLICATION INFORMATION
PROGRAMMING CURRENT LIMIT
The TPS4005x uses a two-tier approach for overcurrent protection. The first tier is a pulse-by-pulse protection
scheme. Current limit is implemented on the high-side MOSFET by sensing the voltage drop across the
MOSFET when the gate is driven high. The MOSFET voltage is compared to the voltage dropped across a
resistor connected from VIN pin to the ILIM pin when driven 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.
The second tier consists of a fault counter. The fault counter is incremented on an overcurrent pulse and
decremented on a clock cycle without an overcurrent pulse. When the counter reaches seven (7) a restart is
issued and seven soft-start cycles are initiated. Both the upper and lower MOSFETs are turned off during this
period. The counter is decremented on each soft-start cycle. When the counter is decremented to zero, the
PWM is re-enabled. If the fault has been removed the output starts up normally. If the output is still present the
counter counts seven overcurrent pulses and re-enters the second-tier fault mode. See Figure 6 for typical
overcurrent protection waveforms.
The minimum current limit setpoint (ILIM) depends on tSTART, CO, VO, and the load current at turn-on (IL).
I
LIM +
C
O
V
O
t
START
) I
L
(Amperes)
The current limit programming resistor (RILIM) is calculated using equation (16).
R
ILIM +
I
OC
R
DS(on)[max]
1.12
I
SINK
)
V
OS
I
SINK
(
W)
where:
D ISINK is the current into the ILIM pin and is nominally 10 A,
D IOC is the overcurrent setpoint which is the DC output current plus one-half of the peak inductor current
D VOS is the overcurrent comparator offset and is nominally 75 mV
UDG02136
HDRV
CLOCK
VVINVSW
SS
7 CURRENT LIMIT TRIPS
(HDRV CYCLE TERMINATED BY CURRENT LIMIT TRIP)
7 SOFT-START CYCLES
VILIM
tBLANKING
Figure 8. Typical Current Limit Protection Waveforms
(15)
(16)
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