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參數資料
| 型號： | LM1575 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | SIMPLE SWITCHER 1A Step-Down Voltage Regulator |
| 中文描述： | 的SIMPLE SWITCHER 1A步降穩(wěn)壓器 |
| 文件頁數： | 8/27頁 |
| 文件大?。?/td> | 725K |
| 代理商： | LM1575 |
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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 Tempera-
ture Range
. Unless otherwise specified, V
IN
= 12V for the 3.3V, 5V, and Adjustable version, V
IN
= 25V for the 12V version,
and V
IN
= 30V for the 15V version. I
LOAD
= 200 mA.
Symbol
Parameter
Conditions
Typ
LM1575-XX
LM2575-XX
LM2575HV-XX
Limit
(Note 3)
Units
(Limits)
Limit
(Note 2)
DEVICE PARAMETERS
θ
JA
Thermal Resistance
θ
JA
θ
JC
θ
JA
θ
JA
θ
JA
ON /OFF CONTROL Test Circuit
Figure 2
V
IH
ON /OFF Pin Logic
V
IL
Input Level
I
IH
ON /OFF Pin Input
Current
I
IL
T Package, Junction to Ambient (Note 9)
T Package, Junction to Ambient (Note 10)
T Package, Junction to Case
N Package, Junction to Ambient (Note 11)
M Package, Junction to Ambient (Note 11)
S Package, Junction to Ambient (Note 12)
65
45
2
85
100
37
C/W
V
OUT
= 0V
V
OUT
= Nominal Output Voltage
ON /OFF Pin = 5V (OFF)
1.4
1.2
12
2.2/
2.4
1.0/
0.8
2.2/
2.4
1.0/
0.8
V(Min)
V(Max)
μA
μA(Max)
μA
μA(Max)
30
30
ON /OFF Pin = 0V (ON)
0
10
10
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended 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 limits are used to calculate Average
Outgoing 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%
production 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:
V
IN
= 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
1
2
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
1
2
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 approximately 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,
θ
JA
is 50C/W; with 1 square inch of copper area,
θ
JA
is 37C/W; and with 1.6 or more square inches of copper area,
θ
JA
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.
L
www.national.com
8
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