Description
The LM5161PWPR ,LM5161 is a 100-V, 1-A synchronous step-down converter with
integrated high-side and low-side MOSFETs. The constant-ON-time
control scheme requires no loop compensation and supports high
step-down ratios with fast transient response. An internal feedback
amplifier maintains ±1% output voltage regulation over the entire
operating temperature range.
The ON-time varies inversely with input voltage resulting in nearly
constant switching frequency. Peak and valley current limit
circuits protect against overload conditions. The undervoltage
lockout (EN/UVLO) circuit provides independently adjustable input
undervoltage threshold and hysteresis. The FPWM input pin in LM5161
selects either the forced continuous conduction mode (CCM) under
all load levels or the discontinuous conduction mode (DCM) under
light or no load conditions. When operating in forced CCM, the
LM5161 supports the multiple output and isolated Fly-Buck
applications. When programmed for the DCM operation, the LM5161
provides a tightly regulated buck output without any additional
external feedback ripple injection circuit.
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