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LM25019 Datenblatt(PDF) 11 Page - Texas Instruments

Teilenummer LM25019
Bauteilbeschribung  LM25019 48-V, 100-mA Constant On-Time Synchronous Buck Regulator
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LM25019 Datenblatt(HTML) 11 Page - Texas Instruments

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VIN
UVLO
VIN
RUV1
CIN
RUV2
2
3
LM25019
LM25019
www.ti.com
SNVS952D – DECEMBER 2012 – REVISED DECEMBER 2014
Feature Description (continued)
7.3.8 Synchronous Rectifier
The LM25019 device provides an internal synchronous N-channel MOSFET rectifier. This MOSFET provides a
path for the inductor current to flow when the high-side MOSFET is turned off.
The synchronous rectifier has no diode emulation mode, and is designed to keep the regulator in continuous
conduction mode even during light loads which would otherwise result in discontinuous operation.
7.3.9 Undervoltage Detector
The LM25019 device contains a dual-level UVLO circuit. A summary of threshold voltages and operational states
is provided in Device Functional Modes. When the UVLO pin voltage is below 0.66 V, the controller is in a low
current shutdown mode. When the UVLO pin voltage is greater than 0.66 V but less than 1.225 V, the controller
is in standby mode. In standby mode the VCC bias regulator is active while the regulator output is disabled. When
the VCC pin exceeds the VCC undervoltage threshold and the UVLO pin voltage is greater than 1.225 V, normal
operation begins. An external set-point voltage divider from VIN to GND can be used to set the minimum
operating voltage of the regulator.
UVLO hysteresis is accomplished with an internal 20-
μA current source that is switched on or off into the
impedance of the set-point divider. When the UVLO threshold is exceeded, the current source is activated to
quickly raise the voltage at the UVLO pin. The hysteresis is equal to the value of this current times the resistance
RUV2.
If the UVLO pin is wired directly to the VIN pin, the regulator will begin operation once the VCC undervoltage is
satisfied.
Figure 12. UVLO Resistor Setting
7.3.10 Thermal Protection
The LM25019 device should be operated so the junction temperature does not exceed 150°C during normal
operation. An internal Thermal Shutdown circuit is provided to protect the LM25019 in the event of a higher than
normal junction temperature. When activated, typically at 165°C, the controller is forced into a low power reset
state, disabling the buck switch and the VCC regulator. This feature prevents catastrophic failures from accidental
device overheating. When the junction temperature reduces below 145°C (typical hysteresis = 20°C), the VCC
regulator is enabled, and normal operation is resumed.
Copyright © 2012–2014, Texas Instruments Incorporated
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