TLF51801ELV Datasheet, PDF (10/29 Pages) Infineon Technologies AG – 10 A synchronous DC/DC Step-Down Controller

TLF51801ELV
Regulator
5.3
Operation Mode
The PWM pulses are voltage controlled. The error amplifier and the PWM comparator are creating the PWM
pulses using the oscillator saw-tooth signal and the feedback voltage. The pulse-width modulation is done so that
the feedback voltage is similar to the reference voltage (1.2 V). To achieve a stable output voltage even under very
low or very high duty cycle conditions a pulse skipping mode is implemented. When the minimum off time for the
up-side gate is reached (boundary between dark grey area and light grey area in Figure 6), the TLF51801ELV
operates in pulse skipping mode for high duty cycle. This operation mode is typically used with low supply voltages
for very low dropout operation. If the minimum on time for the up-side gate is reached (boundary between dark
grey area and light grey area in Figure 6) the TLF51801ELV operates in pulse skipping mode for low duty cycle.
Figure 6 Operation Mode
Data sheet
10
Rev. 1.0.1, 2013-04-15