lm51031 HTC Korea TAEJIN Technology Co., lm51031 Datasheet - Page 4

• Manufacturer Part Number: lm51031
• Description: Fast Pfet Buck Controller
• Manufacturer: HTC Korea TAEJIN Technology Co.

Control Scheme
The LM51031 monitors and the output voltage to
determine when to turn on the PFET. If V
below the internal reference voltage of 1.25V during
and remains on for the duration.of the charge time.
The PFET gets turned off and remains off during
the oscillator’s discharge time with the maximum
duty cycle to 80%. It requires 7mV typical, and
20mV maximum ripple on the V
Fast PFET Buck Controller
theoscillator’s charge cycle, the PFET is turned on
THEORY OF OPERATION
FB
pin is required to
Figure 2. Block Diagram
FB
falls
− 4 −
operate. This method of control does not its require any
The LM51031 has an externally programmable soft start
feature that allows the output voltage to come up
slowly preventing voltage overshoot on the output.
At startup, the voltage on all pins is zero. As V
the V
loop stability compensation.
Startup
C
voltage along with the internal resistor R
LM51031
CC
G
keeps
rises,
HTC