ZIOL2201 datasheet(55/92 Pages) RENESAS

55 / 92 page

ZIOL2xxx Datasheet

April 26, 2016

The converter runs independently from the two driver channels (COM/AUX) and their digital control state

machine. A reset has no influence on the DC/DC converter.

3.6.2.

Principle of Operation

Figure 3.21 shows the working principle of the DC/DC converter. Required external components are described in

chapter 3.6.3.

Figure 3.21 DC/DC Converter in Principle

Supply of External Applications

err

amp

Control

CMP

Triangle

Linear

Regulator

delay

OSC

DIV

VDD_LV

VDD_HV

VIN

VOUT

VDD

LR_IN

VSS

DC_RDY

Vref

= Function (building block) can be

enabled / disabled by corresponding

configuration register data.

Soft Start

Power-on

reset

The DC/DC converter senses the output voltage divided by the resistors R1 and R2 at pin FB. The difference

between this signal and the reference voltage is amplified and then transformed into a PWM signal by comparing

it with a triangular waveform. The PWM signal now enables and disables the output transistor. This results in a

pulse length modulated signal with an amplitude of VDD_HV and –VD (the Schottky diode forward drop) which is

then been filter via a second order LC filter to generate the output voltage VOUT.

ZIOL2201 Datasheet(PDF) 55 Page - Renesas Technology Corp