IC-DC_17 Datasheet, PDF (17/19 Pages) IC-Haus GmbH – 2-CHANNEL BUCK/BOOST DC/DC CONVERTER

iC-DC
2-CHANNEL BUCK/BOOST DC/DC CONVERTER
Rev B1, Page 17/19
EXAMPLE APPLICATION
4.5..32V
VB
GND ^0V
D1
CVB
1μF
ZD1
VBR
CVBR
10μF
VB
VBR
LVBH
22μH
VBL VHL
VCC1
RERR
2k
NERR_DC
RREF
20k
VBR
VCC2 VCC1
R1
30.1k
R2
10k
REVERSE
PROTECT.
INTERNAL
SUPPLY
VBROK
NAUT
TOK
VOLTAGE
MONITOR
AUTARKY
DETECT.
THERMAL
SHUTDOWN
ERROR DETECT.
RREF
BIAS
OSCILLATOR
REFERENCE
ENV1
ENV2
CFG1
CFG2
OUTPUT
ENABLE
CONFIGURATION
VCC1:
5V/3.3V/R1:R2
VCC2:
3.3V/2.5V/R3:R4
BUCK
BOOST
CONTROL
SWITCHING REGULATOR
iC-DC
GNDA GND
VH
VH1
1
LIN.&REG.1
VCC1
1
POE1
SUPPLY
SWITCH 1
VH2
VCC2
2
2
LIN.&REG.2
VCC1,VCC2
TEST
Q
VOLTAGE
MONITORING
SUPPLY
SWITCH 2
POE2
V1OK
1
V2OK
2
CVH
3.3μF
CVH1
3.3μF
CVCC1
1μF
VCC1
CVH2
3.3μF _VCC2
CVCC2
1μF
SELECT RESOLUTION
C1
100nF
iC-LTA
iC-PT Series
PA
NA
PB
NB
TIP TIN SEL
LED
POWER
CONTROL
SIGNAL
COMPARATION
AND
QUADRATURE
OUTPUT
PZ
Q
NZ
INDEX OUTPUT
POWER&ON RESET
U
&
7
V
W
COMMUTATION
VCC
LED
PA
NA
PB
NB
PZ
NZ
U
V
W
GND
NERR_DC
iC&TL85
RLED
47
TNER
ENA
E1
E2
E3
E4
E5
E6
DIFF
C2
100nF
VCC
MODE
Q
1
0
1
0
1
0
ERROR DETECTION
1
UNDERVOLTAGE Q
OVERTEMPERATURE
NER
VB1
A1
A2
VB2
A3
A4
VB3
A5
A6
GND1 GND2 GND3 GND4
iC-DL
R3
ZD2
C3
100nF
C4
100nF
C5
100nF
NER
VB1
D2
D8
A1
D9
A2
D3
VB2
D4
D10
A3
D11
A4
D5
VB3
D12
A5
D6
D13
A6
D7
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.