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© 2014 ROHM Co., Ltd. All rights reserved. www.rohm.com 9 December 2014 Rev.002

Switching Regulator Series Step-Down DC/DC Converter BD9E301EFJ Evaluation Board BD9E301EFJ-EVK-001

Description

BD9E301EFJ-EVK-001 Evaluation board delivers an output 5.0 volts from an input 7.2 to 36 volts using BD9E301EFJ, a

synchronous rectification step-down DC/DC converter integrated circuit, with output current rating of maximum 2.5A. The

output voltage can be set by changing the external parts of circuit and the loop-response characteristics also can be adjusted

by the phase compensation circuit.

Performance specification (These are representative values, and it is not a guaranteed against the characteristics.)

VIN = 24V, VOUT = 5.0V, Unless otherwise specified.

Parameter Min Typ Max Units Conditions

Input Voltage Range 7.0 36 V

Output Voltage 5.0 V R1=12kΩ, R2=3kΩ

Output Voltage Setting Range VIN×0.0855 VIN×0.7 V

Output Current Range 0 2.5 A

Loop Band Width 28.2 kHz

Phase Margin 68.0 degrees

Input Ripple Voltage 150 mVpp IO = 2.5A

Output Ripple Voltage 50 mVpp IO = 2.5A

Output Rising Time 3 ms

Operating Frequency 570 kHz

Maximum Efficiency 87.7 % IO = 1.2A

(NOTE1) When the output voltage is 5.0V, it is 7.2V by limiting ratio of the maximum duty.

(NOTE2) However, (VIN×0.0855) ≥ 1.0V

(NOTE2)

(NOTE1)

BD

© 2ww

Op 1. N

2. C

En

D9E301EF

2014 ROHM Coww.rohm.com

peration Pro

Necessary eq

(1) DC powe

(2) Maximum

(3) DC voltme

Connecting th

(1) DC powe(2) The max. (3) Check Ju(4) Connect p(5) Connect l(6) Connect p(7) Connect p(8) DC powe(9) IC is enab(10) Check D(11) The load(12) Check a

nable-Pin

To minimize EN pin(3pin)OFF-side terIt also can bvoltage betwoperation wh

DC Po

DC Voltmete

FJ-EVK-00

o., Ltd. All rights

ocedures

uipments

r-supply of 7.2

m 2.5A load

eter

he equipments

r-supply prese load should bmper pin of Spositive-terminload’s positivepositive-terminpositive-terminr-supply outpuble (EN) by shDC voltmeter 2d is enabled. at DC voltmete

current consu) of the IC. Sminal and norbe swithed be

ween EN and Ghen it is over 2

ower

r 1

+

-

+

-

V

01

reserved.

2V to 36V/2.5A

s

ets to 24V andbe set at 2.5A W1 is short, bnal of power-se-terminal to Vnal of DC voltmnal of DC voltmut is turned ONhorting Jumpe2 displays 5.0V

er 1 whether th

umption duringStandby-modermal-mode opeetween standbGND-terminal.2.5V.

A

d then the powand over it wi

between intermsupply to VIN+VOUT+terminameter 1 to TPmeter 2 to TP3N. r-pin of SW1 bV.

he voltage-dro

Figure 1

g standby-mode is enabled eration by shoby-mode and . Standby-mod

2/10

wer output turnll be disabled

mediate-termin+terminal and al and negative1 and negativ3 and negativ

between interm

op (loss) is not

1. Connection

de and normaby shorting

orting betweennormal-mode

de is enabled

ns off. . nal and OFF-snegative-terme-terminal to Ge-terminal to Te-terminal to T

mediate-termi

t caused by th

Diagram

al operation, EJumper-pin o

n intermediatee operation bwhen the vol

9

side terminal. minal to GND-teGND-terminal TP2 for input-vTP4 for output

nal and ON-si

he wire’s resist

Enable-mode of SW1 betwe-terminal and y removing Jtage of EN is

9 December

erminal with awith a pair of

voltage measut-voltage mea

ide terminal.

tance.

can be switcheen intermedON-side term

Jumper-pin anunder 0.8V, a

-

+

-

V

+

r 2014 Rev.0

a pair of wires.wires.

urement. surement.

hed by controliate-terminal

minal. nd controlling and normal-m

Load

DC VoltmV

002

.

lling and

the ode

meter 2

3/10

BD9E301EFJ-EVK-001

9 December 2014 Rev.002© 2014 ROHM Co., Ltd. All rights reserved. www.rohm.com

2 VIN

3 EN

1 BOOT

4 AGND

R3

C6S W1 O N

OFF

C 2 C3 TP 1

V I N

GND

SW 8

C7

TP5L1

C4 C5

TP 3

VOUT

GND

FB 5

R2

R1

C8

U1

BD9E301EFJ-LB

COMP 6TP 2

C1

R4

TP 4

9 E

P A

D

J 1

J 2

TP6

7 PGND

2 C1, C7 Ceramic Capacitor 0.1µF 50V, B, ±20% GRM188B31H104MA92 MURATA 1608

1 C2 Ceramic Capacitor 10µF 50V, B, ±10% GRM32EB31H106KA12 MURATA 3225

0 C3 Ceramic Capacitor - Not installed - - 3225

1 C4 Ceramic Capacitor 22µF 10V, B, ±10% GRM31CB31A226KE19 MURATA 3216

0 C5 Ceramic Capacitor - Not installed - - 3216

1 C6 Ceramic Capacitor 2200pF 50V, B, ±10% GRM188B11H222KA01 MURATA 1608

1 C8 Ceramic Capacitor 100pF 50V, CH, ±5% GRM1882C1H101JA01 MURATA 1608

1 L1 Inductor 4.7µH ±30%, DCR=26mΩmax, 4.1A CLF7045T-4R7N TDK 7269

1 R1 Resistor 12kΩ 1/10W, 50V, 1% MCR03ERPF1202 ROHM 1608

1 R2 Resistor 3kΩ 1/10W, 50V, 1% MCR03ERPF3001 ROHM 1608

1 R3 Resistor 10kΩ 1/10W, 50V, 1% MCR03ERPF1002 ROHM 1608

1 R4 Resistor 0Ω Jumper MCR03ERPJ000 ROHM 1608

1 SW1 Pin header - 2.54mm × 3 contacts PH-1x03SG USECONN -

1 U1 IC - Buck DC/DC Converter BD9E301EFJ-LB ROHM HTSOP-J8

2 J1, J2 Terminal Block - 2 contacts, 15A, 14 to 22AWG TB111-2-2-U-1-1Alphaplus

Connectors & Cables

-

1 - Jumper - Jumper pin for SW1 MJ254-6BK USECONN -

ReferenceDesignator

CountManufacturerPart Number

ManufacturerConfiguration

(mm)Type Value Description

Cricuit Diagram

VIN = 7.2V to 36V, VOUT = 5.0V

Figure 2. BD9E301EFJ-EVK-001 Circuit Diagram Bill of Materials

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BD9E301EFJ-EVK-001

9 December 2014 Rev.002© 2014 ROHM Co., Ltd. All rights reserved. www.rohm.com

Layout

Figure 3. Top Silk Screen (Top view)

Figure 4. Top Silk Screen and Layout (Top view)

5/10

BD9E301EFJ-EVK-001

9 December 2014 Rev.002© 2014 ROHM Co., Ltd. All rights reserved. www.rohm.com

Figure 5. Top Side Layout (Top view)

Figure 6. L2 Layout (Top view)

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BD9E301EFJ-EVK-001

9 December 2014 Rev.002© 2014 ROHM Co., Ltd. All rights reserved. www.rohm.com

Figure 7. L3 Layout (Top view)

Figure 8. Bottom Side Layout (Top view)

BD

© 2ww

Effi

cien

cy(%

)O

utpu

tVol

tage

Cha

nge

(%)

D9E301EF

2014 ROHM Coww.rohm.com

0

10

20

30

40

50

60

70

80

90

100

0

Effi

cien

cy (

%)

-0.5

-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

0

Out

put V

olta

ge C

hang

e (%

)

FJ-EVK-00

o., Ltd. All rights

0.5

Lo

0.5

Lo

Figure 9. Eff

Figure 1

01

reserved.

1 1.5

ad Current (A

VI

V

1 1.5

oad Current (A

fficiency vs Lo

11. Load Regu

2

A)

N=12V

VIN=24V

VO=5.0V

2

A)

VIN=12V

VIN=24V

VO=5.0V

ad Current

ulation

7/10

2.5

Out

put V

olta

ge C

hang

e (%

)

2.5

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

5 1

pg

g(

)

VO (AC) 100mV/div

IO: 1A/div

IO: 1A/div

VO (AC) 100mV/div

9

0 15

Inpu

Figure

Figure 12. Lo

VIN = 12V VO = 5.0V

VIN = 24V VO = 5.0V

IO

IO

9 December

20 25

ut Voltage (V)

10. Line Regu

oad Transient

Time

O: 0A→2.5A→

O: 0A→2.5A→

Time

r 2014 Rev.0

30 35

IO=1.0A

ulation

Characteristic

e scale 1ms/d

0A

→0A

e scale 1ms/d

002

40

cs

div

div

BD

© 2ww

D9E301EF

2014 ROHM Coww.rohm.com

Gai

n (d

B)

Gai

n (d

B)

FJ-EVK-00

o., Ltd. All rights

()

fC =PhaGa

()

fC =PhaGai

01

reserved.

Figu

Figu

= 22.4kHz ase margin = in margin = 23

= 28.2kHz ase margin = 6in margin = 22

ure 13. Loop R

ure 14. Loop R

74.1deg3.3dB

68.0deg2.4dB

8/10

Response VIN

Response VIN

Frequenc

Frequenc

= 12V, VO = 5

= 24V, VO = 5

cy (Hz)

Phase

Gain

cy (Hz)

Phase

Gain

9

.0V, IO = 2.5A

.0V, IO = 2.5A

e

n

9 Decemberr 2014 Rev.0

Pha

se (

deg

) P

hase

(d

eg)

002

BD

© 2ww

VIN

50

VIN

50

VO

50

VO

50

D9E301EF

2014 ROHM Coww.rohm.com

F

F

N (AC) 0mV/div

N (AC) 0mV/div

O (AC) 0mV/div

O (AC) 0mV/div

FJ-EVK-00

o., Ltd. All rights

Figure 15. InpV

Figure 17. OutpVIN

01

reserved.

put Voltage RipVIN = 12V, VO =

put Voltage Ri

N = 12V, VO =

Time

Time

Time

Time

pple Wave= 5.0V

ipple Wave5.0V

scale 1μs/div

scale 1μs/div

IO = 0A

IO = 2.5A

scale 1μs/div

scale 1μs/div

IO = 0A

IO = 2.5A

9/10

v

v

V5

V5

v

v

V5

V5

F

VIN (AC) 50mV/div

VIN (AC) 50mV/div

VO (AC) 50mV/div

VO (AC) 50mV/div

9

Figure 16. InpV

Figure 18. OuV

9 December

put Voltage RipVIN = 12V, VO =

utput Voltage RVIN = 24V, VO =

Time

Tim

Time

Time

r 2014 Rev.0

pple Wave= 5.0V

Ripple Wave= 5.0V

IO = 0A

IO = 2.5A

e scale 1μs/d

e scale 1μs/d

e scale 1μs/d

e scale 1μs/d

IO = 0A

IO = 2.5A

002

div

div

div

div

BD

© 2ww

D9E301EF

2014 ROHM Coww.rohm.com

VIN

10V

EN10V

VO

5V/

VIN

10V

EN10V

VO

5V/

VIN

10V

EN10V

VO

5V/

VIN

10V

EN10V

VO

5V/

FJ-EVK-00

o., Ltd. All rights

Figure

Figure

Figure

Figure

V/div

V/div

/div

V/div

V/div

/div

V/div

V/div

/div

V/div

V/div

/div

01

reserved.

19. Start-up EVIN = 12V

e 23. Start-up VIN = 12V

21. Start-up EVIN = 24V

e 25. Start-up VIN = 24V

EN = VIN V, VO = 5.0V, IO

by EN V, VO = 5.0V, IO

EN = VIN V, VO = 5.0V, IO

by EN V, VO = 5.0V, IO

Time scale

Time scale

Time scale

Time scale

10/10

O = 0A

O = 0A

O = 0A

O = 0A

5ms/div

5ms/div

5ms/div

5ms/div

Figure 20. PV

Figure 24. PV

Figure 22. PV

Figure 26. PV

9

ower-down ENIN = 12V, VO =

Power-down byIN = 12V, VO =

ower-down ENIN = 24V, VO =

Power-down byIN = 24V, VO =

Time

Time

Time

Time

9 December

N = VIN = 5.0V, IO = 0A

y EN = 5.0V, IO = 0A

N = VIN = 5.0V, IO = 0A

y EN = 5.0V, IO = 0A

e scale 5ms/

e scale 5ms/

e scale 5ms/

e scale 5ms/

r 2014 Rev.0

A

A

A

A

/div

/div

/div

/div

002

R1102Awww.rohm.com© 2014 ROHM Co., Ltd. All rights reserved.

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