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LM22678QTJE-5.0 Scheda tecnica(PDF) 4 Page - Texas Instruments

Il numero della parte LM22678QTJE-5.0
Spiegazioni elettronici  LM22678/LM22678Q 42V, 5A SIMPLE SWITCHER Step-Down Voltage Regulator with Features
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LM22678
SNVS585K – SEPTEMBER 2008 – REVISED MARCH 2013
www.ti.com
Electrical Characteristics (continued)
Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C
to +125°C. Minimum and Maximum limits are ensured through test, design, or statistical correlation. Typical values represent
the most likely parametric norm at TA = TJ = 25°C, and are provided for reference purposes only. Unless otherwise specified:
VIN = 12V.
Min
Typ
Max
Parameter
Test Conditions
Units
(1)
(2)
(1)
IBIAS
Feedback Bias Current
VFB = 1.3V (ADJ Version Only)
230
nA
VEN
Enable Threshold Voltage
Falling
1.3
1.6
1.9
V
VENHYST
Enable Threshold Hysteresis
0.6
V
IEN
Enable Input Current
EN Input = 0V
6
µA
TSD
Thermal Shutdown Threshold
150
°C
θJA
Thermal Resistance
Junction to ambient thermal
22
°C/W
resistance (3)
(3)
The value of
θJA for the PFM package of 22°C/W is valid if package is mounted to 1 square inch of copper. The θJA value can range
from 20 to 30°C/W depending on the amount of PCB copper dedicated to heat transfer. See application note AN-1797 SNVA328 for
more information.
4
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