The LM25117 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 750 kHz. The LM25117 drives external high-side and low-side NMOS power switches with adaptive dead-time control.
特性
# Emulated peak current mode control
# Wide operating range from 4.5V to 42V
# Robust 3.3A peak gate drives
# Adaptive dead-time output driver control
# Free-run or synchronizable clock up to 750kHz
# Optional diode emulation mode
# Programmable output from 0.8V
# Precision 1.5% voltage reference
# Analog current monitor
# Programmable current limit
# Hiccup mode over current protection
# Programmable soft-start and tracking
# Programmable line under-voltage lockout
# Programmable switch-over to external bias supply
# Thermal shutdown
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