Datasheet Texas Instruments LM5116WG/NOPB — 数据表

LM5116WG
www.ti.com SNVS599D – OCTOBER 2008 – REVISED FEBRUARY 2013 LM5116WG Wide Range Synchronous Buck Controller
Check for Samples: LM5116WG FEATURES DESCRIPTION The LM5116WG is a synchronous buck controller
intended for step-down regulator applications from a
high voltage or widely varying input supply. The
control method is based upon current mode control
utilizing an emulated current ramp. Current mode
control provides inherent line feed-forward, cycle by
cycle current limiting and ease of loop compensation.
The use of an emulated control ramp reduces noise
sensitivity of the pulse-width modulation circuit,
allowing reliable control of very small duty cycles
necessary in high input voltage applications. The
operating frequency is programmable from 50 kHz to
1 MHz. The LM5116WG drives external high-side and
low-side NMOS power switches with adaptive deadtime control. A user-selectable diode emulation mode
enables discontinuous mode operation for improved
efficiency at light load conditions. A low quiescent
current shutdown disables the controller and
consumes less than 10 ВµA of total input current.
Additional features include a high voltage bias
regulator, automatic switch-over to external bias for
improved efficiency, frequency synchronization, cycle …