lm2575hvs-adjep National Semiconductor Corporation, lm2575hvs-adjep Datasheet - Page 8

• Manufacturer Part Number: lm2575hvs-adjep
• Description: Simple Switcher 1a Step-down Voltage Regulator
• Manufacturer: National Semiconductor Corporation

www.national.com
DEVICE PARAMETERS
θ
θ
θ
θ
θ
θ
ON /OFF CONTROL Test Circuit Figure 2
V
V
I
I
All Output Voltage Versions
Electrical Characteristics
IH
IL
Symbol
Note 4: 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 5: 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 6: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the
LM2575EP is used as shown in the Figure 2 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics.
Note 7: Output (pin 2) sourcing current. No diode, inductor or capacitor connected to output pin.
Note 8: Feedback (pin 4) removed from output and connected to 0V.
Note 9: 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 10: V
Note 11: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with
PC board with minimum copper area.
Note 12: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with
containing approximately 4 square inches of copper area surrounding the leads.
Note 13: 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 14: 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
Note 15: 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 16: "Testing and other quality control techniques are used to the extent deemed necessary to ensure product performance over the specified temperature
range. Product may not necessarily be tested across the full temperature range and all parameters may not necessarily be tested. In the absence of specific
PARAMETRIC testing, product performance is assured by characterization and/or design."
JA
JA
JC
JA
JA
JA
Specifications with standard type face are for T
ture Range. Unless otherwise specified, V
and V
IH
IL
IN
= 30V for the 15V version. I
IN
= 40V (60V for the high voltage version).
Thermal Resistance
ON /OFF Pin Logic
Input Level
ON /OFF Pin Input
Current
Parameter
JA
is 50˚C/W; with 1 square inch of copper area, θ
LOAD
T Package, Junction to Ambient (Note 11)
T Package, Junction to Ambient (Note 12)
T Package, Junction to Case
N Package, Junction to Ambient (Note 13)
M Package, Junction to Ambient (Note 13)
S Package, Junction to Ambient (Note 14)
V
V
ON /OFF Pin = 5V (OFF)
ON /OFF Pin = 0V (ON)
= 200 mA.
OUT
OUT
(Note 16) (Continued)
IN
= 12V for the 3.3V, 5V, and Adjustable version, V
= 0V
= Nominal Output Voltage
J
= 25˚C, and those with boldface type apply over full Operating Tempera-
Conditions
8
JA
is 37˚C/W; and with 1.6 or more square inches of copper area, θ
Typ
100
1.4
1.2
65
45
85
37
12
2
0
IN
LM2575HV-XXEP
= 25V for the 12V version,
1
LM2575-XXEP
⁄
2
inch leads soldered to a PC board
1
⁄
2
(Note 5)
2.2/2.4
1.0/0.8
inch leads in a socket, or on a
Limit
30
10
JA
µA(Max)
µA(Max)
(Limits)
is 32˚C/W.
V(Max)
V(Min)
Units
˚C/W
µA
µA