ROHM Solution Simulator

BD18347EFV
Cold Crank Profile Test

This circuit simulates the behavior of Cold Cranking.
You can check if the current is supplied to the LED even when the battery voltage is low due to cold cranking.

U1
ES
VINRES

OUT1
OUT2

VIN

OUT3
OUT4Simulation Setting
Type: Time Domain
Run Time:60msec

OUT1
OUT2
OUT3
OUT4

PARAMETERS:
E1
COUT40.1u

CRT

E2
COUT30.1u

E3
COUT20.1u

REXT = 30
IOUT = 200m

E4
COUT10.1u

REXT

U1
VINRES
VINRES

OUT1{REXT}

0W

MSET1
SET2
MSET2
SET3GND0Min(V(VIN),6)
SET1

PBUS

0SET4

Min(V(VIN),6)00
Min(V(VIN),6)00

CVIN14.7u

Min(V(VIN),6)

0SET1

OUT2

VIN

VIN

OUT30
OUT4OUT1
OUT2
OUT3
OUT4SET2
SET3CRTRSET1{1800/(IOUT/4)}
RSET2{1800/(IOUT/4)}

SET4

RSET3{1800/(IOUT/4)}
RSET40{1800/(IOUT/4)}

D18347EFV-M_s

0

DISC

C00

W

DISC

V1
DC = 13V
AC =TRAN =00

W

CVIN20.1u

0

SET10

MSET10MSET2

SET2
SET3

PBUS

0PBUS

GND

DISC0SET4

SET1
SET2
SET3SET4

BD18347EFV-M_sR{0Figure 1.
Simulation Schematic

VBATILEDFigure 2.
Cold Cranking Profile Test
(ROHM Solution Simulator)
Table 1. Characteristics Comparison
Parameter

Simulation ResultUnitCondition

50.0mA

VBAT=12V

50.0mA

VBAT=7.2V

LED Current(Note 1) The above data is based on a specific sample and it is not meant to be a guaranteed value.
(Note 2) These characteristics depend on some dynamic characteristics of external components, input signal speed,
PCB pattern and mounting condition of each on-board parts.

©2020 ROHM Co., Ltd.

No. AER63-D1-0020 Rev.001
Jun.2020

0ROHM Solution Simulator

BD18347EFV
Energy Sharing Control

This circuit simulates the functions of Energy Sharing Control.
In the Energy Sharing Control, an external resistor REXT is inserted between the VIN and VINRES pins, heat of the IC is
distributed to the REXT.
Simulation Setting
Type: Time Domain
Run Time:15msec
PARAMETERS:
00

PARAMETERS:REXT = 30
IOUT = 200m

REXT

U1
VINRES
VINRES

OUT1{REXT}

CVIN14.7u

W

CVIN20.1u

OUT2

VIN

VIN

OUT3
OUT4REXT = 30
IOUT = 200m
CRT

OUT1
OUT2OUT3OUT4E1
COUT4
OUT10.1u

U1REXT

VINRES
VINRES{REXT}0W

CVIN1
CVIN24.7u DISC 0.1u
DISC

OUT2VIN

0VIN
W

0SET10MSET10MSET2

CRT

SET2
SET3V1

PBUS

GND

PBUS

DISC

SET4

SET10

PBUS

0SET4W

DISC

0MSET2PBUS

00

E4
COUT10.1u

0Min(V(VIN),6)

OUT4E1
COUT40.1u

MSET10

OUT3 0

SET3

GND

0E3
COUT20.1u

OUT2

SET2

BD18347EFV-M_s

V

0OUT3Min(V(VIN),6)
OUT4E2
COUT30.1u

OUT10
Min(V(VIN),6)

E2COUT3

E3
COUT20.1u

0.1u
RSET1{1800/(IOUT/4)}

RSET20{1800/(IOUT/4)}
0
RSET30
Min(V(VIN),6){1800/(IOUT/4)}
RSET4
SET10
SET1{1800/(IOUT/4)}
0
SET2
SET2
SET3
SET3
SET4
SET4

00
Min(V(VIN),6)

0

E4
COUT1
0.1u

00

Min(V(VIN),6)0
Min(V(VIN),6)

RSET1{1800/(IOUT/4)}
RSET2{1800/(IOUT/4)}

RSET3{1800/(IOUT/4)}
RSET40{1800/(IOUT/4)}

BD18347EFV-M_s

0

Min(V(VIN),6)0000

Figure 3.
Simulation Schematic

1.6
1.4
1.2
1.0

Pc_IC

0.80.6

Pc_REXT
0.40.20.05791113
VIN Voltage [V]151719Figure 4.
Energy Sharing Control(ROHM Solution Simulator)
Table 2. Characteristics Comparison
Parameter

Simulation ResultUnit

PC_IC

1.05

W

PC_REXT

0.83

W

Condition

VIN=13V, IOUT_TOTAL=200mA,VOUTx(x=1 to 4)=6V, REXT=40Ω

(Note 1) The above data is based on a specific sample and it is not meant to be a guaranteed value.
(Note 2) These characteristics depend on some dynamic characteristics of external components, input signal speed,
PCB pattern and mounting condition of each on-board parts.

©2020 ROHM Co., Ltd.

No. AER63-D1-0020 Rev.001
Jun.2020

NoticeNotes
1) The information contained herein is subject to change without notice.
2) Before you use our Products, please contact our sales representative and verify the latest specifications :3) Although ROHM is continuously working to improve product reliability and quality, semiconductors can break down and malfunction due to various factors.
Therefore, in order to prevent personal injury or fire arising from failure, please take safetymeasures such as complying with the derating characteristics, implementing redundant andfire prevention designs, and utilizing backups and fail-safe procedures. ROHM shall have noresponsibility for any damages arising out of the use of our Poducts beyond the rating specified byROHM.
4) Examples of application circuits, circuit constants and any other information contained herein areprovided only to illustrate the standard usage and operations of the Products. The peripheral
conditions must be taken into account when designing circuits for mass production.
5) The technical information specified herein is intended only to show the typical functions of andexamples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly,
any license to use or exercise intellectual property or other rights held by ROHM or any otherparties. ROHM shall have no responsibility whatsoever for any dispute arising out of the use ofsuch technical information.
6) The Products specified in this document are not designed to be radiation tolerant.
7) For use of our Products in applications requiring a high degree of reliability (as exemplifiedbelow), please contact and consult with a ROHM representative : transportation equipment (i.e.
cars, ships, trains), primary communication equipment, traffic lights, fire/crime prevention, safety
equipment, medical systems, servers, solar cells, and power transmission systems.
8) Do not use our Products in applications requiring extremely high reliability, such as aerospaceequipment, nuclear power control systems, and submarine repeaters.
9) ROHM shall have no responsibility for any damages or injury arising from non-compliance withthe recommended usage conditions and specifications contained herein.
10) ROHM has used reasonable care to ensurH the accuracy of the information contained in thisdocument. However, ROHM does not warrants that such information is error-free, and ROHM
shall have no responsibility for any damages arising from any inaccuracy or misprint of suchinformation.
11) Please use the Products in accordance with any applicable environmental laws and regulations,such as the RoHS Directive. For more details, including RoHS compatibility, please contact aROHM sales office. ROHM shall have no responsibility for any damages or losses resulting
non-compliance with any applicable laws or regulations.
12) When providing our Products and technologies contained in this document to other countries,
you must abide by the procedures and provisions stipulated in all applicable export laws andregulations, including without limitation the US Export Administration Regulations and the Foreign
Exchange and Foreign Trade Act.
13) This document, in part or in whole, may not be reprinted or reproduced without prior consent ofROHM.

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