LM5145 datasheet(3/62 Pages) TI

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5 Description (continued)

The LM5145-Q1 voltage-mode controller with line feedforward drives external high-side and low-side N-channel

power switches with robust 7.5-V gate drivers suitable for standard-threshold MOSFETs. Adaptively-timed gate

drivers with 2.3-A source and 3.5-A sink capability minimize body diode conduction during switching transitions,

reducing switching losses and improving thermal performance when driving MOSFETs at high input voltage and

high frequency. The LM5145-Q1 can be powered from the output of the switching regulator or another available

source, further improving efficiency.

A 180° out-of-phase clock output relative to the internal oscillator at SYNCOUT works well for cascaded or

multi-channel power supplies to reduce input capacitor ripple current and EMI filter size. Additional features of

the LM5145-Q1 include a configurable soft start, an open-drain power-good monitor for fault reporting and output

monitoring, monotonic start-up into prebiased loads, integrated VCC bias supply regulator and bootstrap diode,

external power supply tracking, precision enable input with hysteresis for adjustable line undervoltage lockout

(UVLO), hiccup-mode overload protection, and thermal shutdown protection with automatic recovery.

The LM5145-Q1 controller is offered in a 4.5-mm × 3.5-mm thermally enhanced, 20-pin VQFN package with

additional spacing for high-voltage pins and wettable flanks for optical inspection of solder joint fillets.

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LM5145-Q1

SNVSBU9 – JUNE 2021

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LM5145 датащи(PDF) 3 Page - Texas Instruments