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參數資料
| 型號： | LMX2575MX-15 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | SMT-24 |
| 文件頁數： | 28/30頁 |
| 文件大小： | 676K |
| 代理商： | LMX2575MX-15 |
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All Output Voltage Versions
Electrical Characteristics (Continued)
Specifications with standard type face are for T
J = 25C, and those with boldface type apply over full Operating Temperature
Range. Unless otherwise specified, V
IN = 12V for the 3.3V, 5V, and Adjustable version, VIN = 25V for the 12V version, and VIN
= 30V for the 15V version. I
LOAD = 200 mA.
Symbol
Parameter
Conditions
Typ
LM1575-XX
LM2575-XX
Units
(Limits)
LM2575HV-XX
Limit
(Note 2)
(Note 3)
ON /OFF CONTROL Test Circuit
Figure 2
V
IH
ON /OFF Pin Logic
V
OUT = 0V
1.4
2.2/2.4
V(Min)
V
IL
Input Level
V
OUT = Nominal Output Voltage
1.2
1.0/0.8
V(Max)
I
IH
ON /OFF Pin Input
ON /OFF Pin = 5V (OFF)
12
A
Current
30
A(Max)
I
IL
ON /OFF Pin = 0V (ON)
0A
10
A(Max)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-
tended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All limts are used to calculate Average Out-
going Quality Level, and all are 100% production tested.
Note 3: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% pro-
duction tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods.
Note 4: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM1575/
LM2575 is used as shown in the
Figure 2 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics.
Note 5: Output (pin 2) sourcing current. No diode, inductor or capacitor connected to output pin.
Note 6: Feedback (pin 4) removed from output and connected to 0V.
Note 7: Feedback (pin 4) removed from output and connected to +12V for the Adjustable, 3.3V, and 5V versions, and +25V for the 12V and 15V versions, to force
the output transistor OFF.
Note 8: VIN = 40V (60V for the high voltage version).
Note 9: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with 12 inch leads in a socket, or on a PC
board with minimum copper area.
Note 10: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with 12 inch leads soldered to a PC board
containing approximately 4 square inches of copper area surrounding the leads.
Note 11: Junction to ambient thermal resistance with approxmiately 1 square inch of pc board copper surrounding the leads. Additional copper area will lower thermal
resistance further. See thermal model in Switchers made Simple software.
Note 12: If the TO-263 package is used, the thermal resistance can be reduced by increasing the PC board copper area thermally connected to the package: Using
0.5 square inches of copper area,
θJA is 50C/W; with 1 square inch of copper area, θJA is 37C/W; and with 1.6 or more square inches of copper area, θJA is 32C/W.
Note 13: The oscillator frequency reduces to approximately 18 kHz in the event of an output short or an overload which causes the regulated output voltage to drop
approximately 40% from the nominal output voltage. This self protection feature lowers the average power dissipation of the IC by lowering the minimum duty cycle
from 5% down to approximately 2%.
Note 14: Refer to RETS LM1575J for current revision of military RETS/SMD.
Typical Performance Characteristics (Circuit of Figure 2)
Normalized Output Voltage
DS011475-32
Line Regulation
DS011475-33
Dropout Voltage
DS011475-34
www.national.com
7
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