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| 型号： | TPS40054PWPRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 6/35页 |
| 文件大小： | 866K |
| 代理商： | TPS40054PWPRG4 |
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PROGRAMMING CURRENT LIMIT
(
)
( )
O
ILIM
L
SS
C
V
I
A
t
>
+
÷
÷
è
(14)
UDG-02136
HDRV
CLOCK
VVIN-VSW
SS
7 CURRENT LIMIT TRIPS
(HDRV CYCLE TERMINATED BY CURRENT LIMIT TRIP)
7 SOFT-START CYCLES
VILIM
tBLANKING
SLUS593F – DECEMBER 2003 – REVISED SEPTEMBER 2008 ...................................................................................................................................... www.ti.com
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 9 for typical overcurrent
protection waveforms.
where
C
O is the output capacitance
V
O is the regulated output voltage
t
SS is the soft-start time
Figure 9. Typical Current Limit Protection Waveforms
14
Copyright 2003–2008, Texas Instruments Incorporated
Product Folder Link(s): TPS40054 TPS40055 TPS40057
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