IC-DC datasheet(17/19 Pages) ICHAUS

17 / 19 page

iC-DC

2-CHANNEL BUCK/BOOST DC/DC CONVERTER

Rev B1, Page 17/19

EXAMPLE APPLICATION

INDEX OUTPUT

AND

iC&TL85

iC-PT Series

VB1

VOLTAGE

ENABLE

LIN.&REG.1

SUPPLY

OUTPUT

SWITCH 2

5V/3.3V/R1:R2

VCC1:

VCC2:

4.5..32V

SELECT RESOLUTION

SUPPLY

THERMAL

SHUTDOWN

BUCK

SUPPLY

LIN.&REG.2

CONTROL

MONITORING

REFERENCE

SEL

VB3

PROTECT.

LED

POWER

CONTROL

OUTPUT

COMPARATION

SIGNAL

BIAS

BOOST

SWITCHING REGULATOR

3.3V/2.5V/R3:R4

OSCILLATOR

ERROR DETECT.

AUTARKY

DETECT.

REVERSE

INTERNAL

CONFIGURATION

MONITOR

COMMUTATION

SWITCH 1

VOLTAGE

iC-DC

NERR_DC

iC-DL

VB2

iC-LTA

POWER&ON RESET

QUADRATURE

100nF

RREF

20k

100nF

10μF

CVBR

D12

D13

D10

D11

ZD1

RLED

ZD2

100nF

CVB

1μF

100nF

CVH

3.3μF

CVCC2

1μF

CVCC1

3.3μF

CVH1

CVH2

3.3μF

LVBH

22μH

ERROR DETECTION

UNDERVOLTAGE Q

OVERTEMPERATURE

MODE

RERR

VBR

30.1k

10k

GND

SEL

VCC2

VCC1

NER

GND3

VCC

NER

VB1

VB2

VB3

DIFF

GND4

GND2

GND1

VCC1

VCC2 VCC1

NERR_DC

VCC

LED

VBR

ENA

TNER

RREF

VCC1,VCC2

TEST

V1OK

V2OK

VCC2

POE2

TOK

VBROK

VH1

GND

TIP

TIN

VBR

VBL

VHL

GNDA

CFG1

CFG2

ENV1

ENV2

NAUT

VH2

POE1

VCC1

20k

RREF

100nF

RLED

ZD1

D10

D11

D12

D13

100nF

CVBR

10μF

ZD2

100nF

1μF

CVB

100nF

3.3μF

CVH2

1μF

CVCC2

CVCC1

1μF

CVH1

3.3μF

CVH

22μH

LVBH

OVERTEMPERATURE

UNDERVOLTAGE Q

ERROR DETECTION

MODE

30.1k

10k

RERR

Figure 9: Application with iC-DC, iC-PT, and iC-DL

The application diagram in Figure 9 shows an exam-

ple circuit featuring the DC/DC converter iC-DC. The

input voltage range is set to between 4.5 V and 32 V by

line driver iC-DL. The output voltages of the two linear

regulators are each configured to 5 V. VCC2 supplies

the optical 6-channel incremental scanner iC-LTA/iC-PT

and VCC1 the 5 V section of 24 V line driver iC-DL. This

creates a separation in the supply voltage between the

sensing mechanism and the digital switching section of

the circuitry.

The status signals for overvoltage (VBROK) and

overtemperature (TOK) in iC-DC are connected to

iC-DL’s error message input TNER. This links the

iC-DC error messages to iC-DL’s own undervoltage

and overtemperature monitor. iC-DL’s open-drain error

message output NER thus provides the error messages

for both ICs.

This example circuit makes use of iC-DC’s integrated re-

verse polarity protection feature. The illustrated diodes

ZD1, ZD2, D2 to D13 and resistor R3 form the basis for

a protective circuit against overvoltage for all outputs.

No specific designations are given for these compo-

nents as these protective circuits are to be individually

configured and dimensioned according to the applica-

tion and requirement.

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