LM2577S-12 National Semiconductor, LM2577S-12 Datasheet - Page 9

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LM2577S-12

Manufacturer Part Number
LM2577S-12
Description
IC,SMPS CONTROLLER,CURRENT-MODE,BIPOLAR,SIP,5PIN,PLASTIC
Manufacturer
National Semiconductor
Datasheets

Specifications of LM2577S-12

Rohs Compliant
NO

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LM2577S-12
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NSC
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Electrical Characteristics—LM1577-ADJ, LM2577-ADJ
Note 8: 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 9: 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
Typical Performance Characteristics
∆ Reference Voltage
Reference Voltage
Reference Voltage
vs Supply Voltage
vs Temperature
vs Temperature
JA
is 50˚C/W; with 1 square inch of copper area, θ
01146838
01146836
01146834
9
JA
is 37˚C/W; and with 1.6 or more square inches of copper area, θ
∆ Reference Voltage
∆ Reference Voltage
Reference Voltage
vs Supply Voltage
vs Supply Voltage
vs Temperature
(Continued)
01146839
01146837
01146835
www.national.com
JA
is 32˚C/W.

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