Part Name
         Description
LM5072

 Integrated 100V Power Over Ethernet PD Interface and PWM Controller with Aux Support ( 24 Page)


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Electrical Characteristics (Note 4) Specifications in standard type face are for T
J = +25˚C and those in
boldface type apply over the full operating junction temperature range. Unless otherwise specified: V
IN = 48V, FOSC =
250kHz. (Continued)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Low Saturation
0.25
0.75
V
t
r
Rise time
C
LOAD = 1nF
18
ns
t
f
Fall time
C
LOAD = 1nF
15
ns
PDI Thermal Shutdown (Note 5)
Thermal Shutdown Temp.
165
˚C
Thermal Shutdown Hysteresis
25
˚C
Thermal Resistance
θ
JA
Junction to Ambient
MXA package
125
˚C/W
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device
is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: The human body model is a 100 pF capacitor discharged through a 1.5 k
Ω resistor into each pin.
Note 3: For detailed information on soldering the plastic TSSOP package, refer to the Packaging Databook available from National Semiconductor.
Note 4: Minimum and Maximum limits are guaranteed through test, design, or statistical correlation using Statistical Quality Control (SQC) methods. Typical values
represent the most likely parametric norm at TJ = 25˚C, and are provided for reference purpose only. Limits are used to calculate National’s Average Outgoing Quality
Level (AOQL).
Note 5: Device thermal limitations may limit usable range.
Note 6: The VCC regulator is intended for use solely as a bias supply for the LM5072, dropout assumes 3mA of external VCC current.
Note 7: During rear auxiliary operation, the RTN pin can be approximately -0.4V with respect to VEE. This is caused by normal internal bias currents, and will not
harm the device. Application of external voltage or current must not cause the absolute maximum rating to be exceeded.
www.national.com
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