參數(shù)資料
型號： TPS40200MDREPG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8
封裝： GREEN, PLASTIC, MS-012AA, SOIC-8
文件頁數(shù)： 16/43頁
文件大小： 1069K
代理商： TPS40200MDREPG4
www.ti.com
Switching Frequency
SW
RC
f
105
.
0
1
C
R
=
(17)
Programming the Overcurrent Threshold Level
8
7
VDD
ISNS
R
ILIM
6
GDRV
V
IN
R
F1
R
F2
C
F
TPS40200
ILIM
R
1
.
0
ILIM =
SGLS371 – JANUARY 2007
The TPS40200 has a built-in, 8-V, 200-mA, P-channel FET driver output that facilitates using P-channel
switching FETs. A clock frequency of 300 kHz was chosen as a switching frequency which represents a
compromise between a high frequency that allows the use of smaller capacitors and inductors, but one that is
not so high as to cause excessive transistor switching losses. As previously discussed, an optimum frequency
can be selected by picking a value where the dc and switching losses are equal.
The frequency is set by using the design formula given in the FET Selection Criteria section.
Where:
RRC = Timing resistor value (in ohms), or RRC = 68.1
CRC = Timing capacitor value (in F), or C5 = 470 pF
fSW = Desired switching frequency (in Hz) which, in this case, calculates to 297 kHz
At a worst case of 16 V, the timing resistor draws about 250
A, which is well below the 750 A maximum that
the circuit can pull down.
The current limit in the TSP40200 is triggered by a comparator with a 100-mV offset, whose inputs are
connected across a current-sense resistor between VCC and the source of the high-side switching FET. When
current in this resistor develops more than 100 mV, the comparator trips and terminates the output gate drive.
In this application, the current-limit resistor is set by the peak output-stage current, which consists of the
maximum load current plus one-half the ripple current (in this case, 2.5 + 0.125 = 2.625 A). To accommodate
tolerances, a 25% margin is added, giving a 3.25-A peak current. Using the equation below then yields a value
for RILIM of 0.30 .
Current sensing in a switching environment requires attention to both circuit-board traces and noise pickup. In
Figure 34, a small RC filter has been added to the circuit to prevent switching noise from tripping the
current-sense comparator. The requirements of this filter are board dependent, but with the layout used in this
application, no spurious overcurrent was observed.
Figure 34. Overcurrent Trip Circuit for RF2 Open
23
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