參數(shù)資料
型號(hào)： LTM8052IV#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PBGA81
封裝： 15 X 11.25 MM, 2.82 MM HEIGHT, ROHS COMPLIANT, MO-222, LGA-81
文件頁(yè)數(shù)： 10/28頁(yè)
文件大?。?/td> 350K
代理商： LTM8052IV#PBF
LTM8052
18
8052f
applicaTions inForMaTion
Figures 5a through 5c are crowbar circuits, which attempt
to prevent the input voltage from rising above some level
by clamping the input to GND through a power device. In
some cases, it is possible to simply turn off the LTM8052
when the input voltage exceeds some threshold. This
is possible when the voltage power source that drives
current into VOUT never exceeds VIN. An example of this
circuit is shown in Figure 5d. When the power source on
the output drives VIN above a predetermined threshold,
the comparator pulls down on the RUN pin and stops
switching in the LTM8052. When this happens, the input
capacitance needs to absorb the energy stored within the
LTM8052’s internal inductor, resulting in an additional
voltage rise. As shown in the Block Diagram, the internal
inductor value is 2.2uH. If the LTM8052 negative current
VIN
ZENER
DIODE
SCR
8052 F05a
LTM8052
LOAD
CURRENT
GND
VOUT
FUSE
SOURCING
LOAD
Figure 5c. The SCR Latches On When the Activation Threshold is
Reached, So a Fuse or Some Other Method of Disconnecting the
Load Should be Used
Figure 5d. This Comparator Circuit Turns Off the LTM8052 if
the Input Rises Above a Predetermined Threshold. When the
LTM8052 Turns Off, the Energy Stored in the Internal Inductor
Will Raise VIN a Small Amount Above the Threshold.
VIN
RUN
8052 F05d
10F
LTM8052
LOAD
CURRENT
GND
VOUT
SOURCING
LOAD
EXTERNAL
REFERENCE
VOLTAGE
+
–
limit is set to 5A, for example, the energy that the input
capacitance must absorb is 1/2 LI2 = 27.5μJ. Suppose
the comparator circuit in Figure 5d is set to pull the RUN
pin down when VTRIP = 15V. The input voltage will rise
according to the capacitor energy equation:
1
2
C (VIN 2 VTRIP 2) = 27.5J
If the total input capacitance is 10μF, the input voltage
will rise to:
27.5J
=
1
2
10F(VIN 2 15V2)
VIN = 15.2V
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