The LM5007SD/NOPB is a 500mA Non-synchronous Constant On-time Buck Regulator features all of the functions needed to implement efficient, Buck bias regulator. This high voltage regulator contains an 80V, 0.7A N-channel Buck Switch. The regulator is based on a hysteretic control scheme using an on time inversely proportional to VIN. This feature allows the operating frequency to remain relatively constant with load and input voltage variations. The hysteretic control requires no control loop compensation, while providing very fast load transient response. An intelligent current limit is implemented in the LM5007 with forced off time that is inversely proportional to VOUT. This current limiting scheme reduces load current fold-back. Additional protection features include thermal shutdown, Vcc under-voltage lockout, gate drive under-voltage lockout and maximum duty cycle limiter.
Internal HV Vcc regulator
No control loop compensation required
Ultra-fast transient response
On time varies inversely with line voltage
Operating frequency nearly constant with varying line voltage
(EN)
