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參數(shù)資料
| 型號(hào)： | ISL72991RHF |
| 廠商： | Intersil Corporation |
| 英文描述： | Cabinet Rack Front Panel; External Height:15.75"; External Width:19"; Enclosure Color:White; Enclosure Material:Aluminum; Weight:3.62lb; Thickness:0.12" |
| 中文描述： | 輻射加固負(fù)低壓差可調(diào)穩(wěn)壓器 |
| 文件頁數(shù)： | 2/3頁 |
| 文件大小： | 210K |
| 代理商： | ISL72991RHF |
2
Application Information
Typical User Application:
Output Voltage Programming
The output voltage of the regulator can be programmed with
two external resistors and is described by the following
equation: V
OUT
= V
REF
x (1+R2/R1) - (I
ADJ
x R2).
Output Current Limit Programming
The output current limit threshold of the regulator can be
programmed with a single external resistor connected from
I
LIM
to ground. The current flowing into the I
LIM
pin is
described by the following equation: I
LIM
= 1V/(R
CL
+ 2400).
The graph below shows the relationship between I
LIM
and
the output current limit threshold, I
OUT_LIM
.
Capacitor Selection
An input capacitor is required if the regulator is located more
than 6 inches from power supply filter capacitors. A 10μF
solid tantalum capacitor is recommended.
An output capacitor of at least 10μF must be used to insure
stability of the regulator. Additional capacitance may be
added as required to improve the dynamic response of the
regulator. Solid tantalum and/or ceramic capacitors are
recommended.
Loop Compensation
The output capacitor and ESR comprise a zero in the loop
transfer function that must be compensated with a pole to
insure loop stability in accordance with the following
equation: C
C
x R2 = C
OUT
x ESR. The compensating
capacitor should be a low ESR ceramic type.
Layout Guidelines
The stability of the regulator is sensitive to layout. It is
strongly recommended that a continuous copper ground
plane (1 ounce or greater) be used. In addition, component
lead lengths and interconnects should be minimized, but
should not exceed 1/2 inch. Finally, the return lead of the
compensation capacitor (C
C
) should be connected as close
as possible to the GND pin of the IC.
ISL72991RH
VIN
ILIM
SD
GND
VOUT
ADJ
VIN
C
R
R
C
R
C
VOUT
FIGURE 1. TYPICAL APPLICATION SCHEMATIC
FIGURE 2. I
OUT_LIM
vs I
LIM
I
LIM
(A)
I
O
ISL72991RH
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