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LM25183 Datenblatt(PDF) 14 Page - Texas Instruments

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Teilenummer LM25183
Bauteilbeschribung  LM25183 42-VIN PSR Flyback DC/DC Converter with 65-V, 2.5-A Integrated Power MOSFET
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ª
º
˜ «
»
¬
¼
SW-PEAK
OUT(max)
OUT
D
IN
PS
I
I
V
V
1
2
V
N
14
LM25183
SNVSBJ3 – APRIL 2020
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Product Folder Links: LM25183
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Copyright © 2020, Texas Instruments Incorporated
Feature Description (continued)
When using a transformer auxiliary winding for bias power, the total leakage current related to diodes DBIAS1 and
DBIAS2 in Figure 18 must be less than 1 µA across the full operating temperature range.
7.3.8 Minimum On-Time and Off-Time
When the internal power MOSFET is turned off, the leakage inductance of the transformer resonates with the
SW node parasitic capacitance. The resultant ringing behavior can be excessive with large transformer leakage
inductance and can corrupt the secondary zero-current detection. To prevent such a situation, a minimum switch
off-time, designated as tOFF-MIN, of a maximum of 375 ns is set internally to ensure proper functionality. This sets
a lower limit for the transformer magnetizing inductance as discussed in the Detailed Design Procedure.
Furthermore, noise effects as a result of power MOSFET turnon can impact the internal current sense circuit
measurement. To mitigate this effect, the LM25183 provides a blanking time after the MOSFET turns on. This
blanking time forces a minimum on-time, tON-MIN, of 140 ns.
7.3.9 Overcurrent Protection
In case of an overcurrent condition on the isolated output or outputs, the output voltage drops lower than the
regulation level since the maximum power delivered is limited by the peak current capability on the primary side.
The peak primary current is maintained at 2.5 A (plus an amount related to the 100-ns propagation delay of the
current limit comparator) until the output decreases to the secondary diode voltage drop to impact the reflected
signal on the primary side. At this point, the LM25183 assumes the output cannot be recovered and re-calibrates
its switching frequency to 9 kHz until the overload condition is removed. The LM25183 responds with similar
behavior to an output short circuit condition.
For a given input voltage, Equation 13 gives the maximum output current prior to the engagement of overcurrent
protection. The typical threshold value for ISW-PEAK from the Electrical Characteristics is 2.5 A.
(13)
7.3.10 Thermal Shutdown
Thermal shutdown is an integrated self-protection to limit junction temperature and prevent damage related to
overheating. Thermal shutdown turns off the device when the junction temperature exceeds 175°C to prevent
further power dissipation and temperature rise. Junction temperature decreases after shutdown, and the
LM25183 restarts when the junction temperature falls to 165°C.


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