Datasheet Texas Instruments LM34923MMX/NOPB — Datenblatt

LM34923
www.ti.com SNVS695A – MARCH 2011 – REVISED FEBRUARY 2013 80-V 600-mA Constant On-Time Buck Switching Regulator
Check for Samples: LM34923 FEATURES DESCRIPTION The LM34923 Step Down Switching Regulator
features all of the functions needed to implement a
low cost, efficient Buck bias regulator. This high
voltage regulator contains an 80V N-Channel
MOSFET Switch and a startup regulator. The device
is easy to implement and is provided in an 10-pin
VSSOP package. The regulator’s control scheme
uses an on-time inversely proportional to VIN. This
feature results in the operating frequency remaining
relatively constant with line and load variations. The
control scheme requires no loop compensation,
resulting in fast transient response. An intelligent
current limit is implemented with a forced off-time
which is inversely proportional to VOUT. This scheme
ensures short circuit control while providing minimum
foldback. Other features include: Thermal Shutdown,
VCC Under Voltage Lock-out, Max Duty Cycle
Limiter, a Pre-charge Switch, and a programmable
Under Voltage Detector with a status flag output. 1 2 Operating Input Voltage Range: 6V to 75V
Integrated 80V, N-Channel Buck Switch
Internal Start-up Regulator …