參數(shù)資料
型號(hào)： ISL6140CBZ-T
廠商： INTERSIL CORP
元件分類(lèi)： 電源管理
英文描述： Negative Voltage Hot Plug Controller
中文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
封裝： MS-012-AA, PLASTIC, SOIC-8
文件頁(yè)數(shù)： 15/18頁(yè)
文件大小： 511K
代理商： ISL6140CBZ-T
15
Inrush Current
In the example in Figure 26, the supply voltage is 48V and
the load resistor (RL) is 620
, for around 80mA. The load
capacitance is 100
μ
F (100V). The Sense Resistor (R1) is
0.02
(trip point at 2.5A; well above the inrush current here).
Note that the load current starts at 0 (FET off); reaches a
peak of ~850mA as the GATE voltage ramps and turns on
the FET slowly, and then settles out at 80mA, once the CL is
fully charged to the 48V. The width of the inrush current
pulse is 8ms wide. For comparison, with the same
conditions, but without the gate-controlled FET, the current
was over 20A, during a 130
μ
s pulse.
Power Supply Ramp
Figure 27 shows the Power Supply voltage (to the VDD pin,
with respect to GND at the VEE pin) ramping up. In this
case, the values chosen were R4 = 562K; R5 = 5.9K;
R6 = 13.3K; that sets the UV trip point around 38V, and the
OV trip point to 54V. Note that the GATE starts at 0V, and
stays there until the UV trip point (38V) is exceeded; then it
ramps (slowly, based on the external components chosen)
up to around 13V, where it is clamped; it stays there until the
power supply exceeds the OV trip point at 54V (the GATE
shut-off is much faster than the turn-on). The total time scale
is 2 seconds; the VDD ramp speed was simply based on the
inherent characteristic of the particular power supply used.
Over-Current at 2.3A
In Figure 28, an Electronic Load Generator was used to
ramp the load current; no load resistor or capacitor was
connected. The sense Resistor R1 is 0.02
; that should
make the nominal Over-Current trip point 2.5A.
The GATE is high (clamped to around 13V), keeping the
FET on, as the current starts to ramp up from zero; the
GATE starts to go low (to shut off the FET) when the load
current hits 2.3A. Note that it takes only 44
μ
s for the GATE
to shut off the FET (when the load current equals zero).
Keep in mind that the tolerance of the sense resistor (1%
here) and the IC Over-Current trip voltage (V
CB
) affect the
accuracy of the trip point; that’s why the trip point doesn’t
necessarily equal the 2.5A design target.
PWRGD-bar
GATE
Load
Current
48V
FIGURE 26. INRUSH CURRENT
FIGURE 27. POWER SUPPLY RAMP
FIGURE 28. OVER-CURRENT AT 2.3A
Load Current
GATE
2.3 A
R1 = 0.02 ohm
48V
No cap
FIGURE 28. OVER-CURRENT AT 2.3A
ISL6140, ISL6150
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ISL6141 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:Negative Voltage Hot Plug Controller
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