TLE6368_06 datasheet(8/59 Pages) INFINEON

8 / 59 page

TLE 6368 / SONIC

Data Sheet

Rev. 2.2, 2006-12-01

Detailed circuit description

In the following major buck regulator blocks, the linear voltage regulators and trackers,

the undervoltage reset function, the watchdog and the SPI are described in more detail.

For applications information e.g. choice of external components, please refer to section

2.1

Buck Regulator

The diagram below shows the internal implemented circuit of the Buck converter, i. e. the

internal DMOS devices, the regulation loop and the other major blocks.

Figure 3 Detailed Buck regulator diagram

The 1.5A Buck regulator consists of two internal DMOS power stages including a current

mode regulation scheme to avoid external compensation components plus additional

blocks for low EME and reduced switching loss. Figure 3 indicates also the principle how

Int. voltage

regulator

Int. charge

pump

Zero cross

detection

Divider

Oscillator

1.4MHz

Slope logic

under-

voltage

lockout

Gate driver

Delay unit

14V

150µA

Vref=6V

Voltage

feedback

amplifier

Current

sense

amplifier

Current

comparator

PWM logic

Gate off signal

from overtemp or

sleep command

Trigger for

gate on

Trigger for

gate off

Slope

compensation

Lowpass

switching frequency 330kHz

Slope

control

from

current sensing

current sense

amplifier

FB/L_IN

C+

C-

CCP

SLEW

BOOT-

STRAP

BOOST

external components

Main switch ON/OFF

Slope switch

charge signal

Slope switch

discharge signal

8 to 10V

Main

DMOS

Slope

DMOS

pins

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