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| 型号： | TPS40197RGYR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 520 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封装： | PLASTIC, MO-241BB, VQFN-16 |
| 文件页数： | 6/30页 |
| 文件大小： | 931K |
| 代理商： | TPS40197RGYR |
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(
)
t
R1 C1
0.4 V
e
10 A
R1
-
÷
è
m
÷
è
UDG-08098
5
6
FB
COMP
R1
C1
C2
R
COMP
TPS40197
V
OUT
ILIM(max)
SCP(max)
DS(on)min
V
I
R
=
ILIM(min)
SCP(min)
DS(on)max
V
I
R
=
TI Information — Selective Disclosure
SLUS886 – NOVEMBER 2008
www.ti.com
The TPS40197 provides three selectable short-circuit protection thresholds for the low-side FET: 100 mV, 200
mV and 280 mV. The particular threshold is selected by connecting a resistor from COMP to GND. Table 1
shows the short-circuit thresholds for corresponding resistors from COMP to GND. When designing the
compensation for the feedback loop, remember that a low impedance compensation network combined with a
long network time constant can cause the short-circuit threshold setting to not be as expected. The time constant
and impedance of the network connected from COMP to FB should be as in Equation 1 to guarantee no
interaction with the short-circuit threshold setting.
where
t is 1.15 ms, the sampling time of the short circuit threshold setting circuit
R1 and C1 are the values of the components in Figure 16
(1)
Figure 16. Short Circuit Threshold Feedback Network
Table 1. Circuit Threshold Voltage Selection
COMPARATOR RESISTANCE
CURRENT LIMIT THRESHOLD
RCOMP (k)
VOLTAGE VILIM (mV)
12 ±10%
280
OPEN
200
4 ±10%
100
The range of expected short-circuit current thresholds is shown in Equation 2 and Equation 3.
(2)
where
ISCP is the short circuit current
VILIM is the short-circuit threshold for the low-side MOSFET
RDS(on) is the channel resistance of the low-side MOSFET
(3)
14
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS40197
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