TLD5085EJ Datasheet, PDF (10/16 Pages) Infineon Technologies AG – 1.8A DC/DC Step-Down Converter Infineon Power LED Driver

TLD5085EJ
Oscillator
7
Oscillator
7.1
Description
The oscillator turns on the power-switch with a constant frequency while the buck regulating circuit turns the
power-switch off in every cycle with an appropriate time gap depending on the output and input voltage.
The internal sawtooth signal used for the PWM generation has an amplitude proportional to the input supply
voltage (feedforward).
7.2
Electrical Characteristics Oscillator
Electrical Characteristics: Buck Regulator
V_S = 6.0 V to 40 V, T_j = -40 °C to +150 °C, all voltages with respect to ground (unless otherwise specified)
Pos. Parameter
Symbol
Limit Values
Unit Conditions
Min. Typ. Max.
7.2.1 Oscillator frequency
f_osc
330 370 420 kHz –
Datasheet
10
Rev. 1.0, 2009-06-04