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© 2014 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp 8.Dec.2014 Rev.001

Switching Regulator Series Step-Down DC/DC Converter BD9D320EFJ Evaluation Board BD9D320EFJ-EVK-001

Description

BD9D320EFJ-EVK-001 Evaluation board delivers an output 3.3 volts from an input 5.08 to 18 volts using BD9D320EFJ, a

synchronous rectification step-down DC/DC converter integrated circuit, with output current rating of maximum 3A. It offers

high efficiency in all load ranges by equipping the efficiency improvement function in light-load. 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 = 12V, VOUT = 3.3V, Unless otherwise specified.

Parameter Min Typ Max Units Conditions

Input Voltage Range 4.5 18 V

Output Voltage 3.3 V R1+R2=71.3kΩ, R3=22kΩ

Output Voltage Setting Range 0.765

(VIN×0.07)

7.0 (VIN×0.65)

V

Output Current Range 0 3.0 A

Input Ripple Voltage 80 mVpp IO = 3.0A

Output Ripple Voltage 40 mVpp IO = 3.0A

Output Rising Time 3 ms

Operating Frequency 700 kHz

Maximum Efficiency 89.4 % IO = 1.4A

(NOTE1) When the output voltage is 3.3V, it is 5.08V by limiting ratio of the maximum duty.

(NOTE1)

BD

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2. C

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DC

D9D320EF

2014 ROHM Coww.rohm.co.jp

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(1pin)OFF-side terIt also can bvoltage betwoperation wh

DC Powe

C Voltmeter 1

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ocedures

uipments

r-supply of 5.0

m 3A load

eter

he equipments

r-supply prese

load should b

mper pin of S

positive-termin

load’s positive

positive-termin

positive-termin

r-supply outpu

ble (EN) by sh

DC voltmeter 2

d is enabled.

at DC voltmete

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

ween EN and Ghen it is over 2

er

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-

+

-

V

01

reserved.

08V to 18V/3A

s

ets to 12V and

be set at 3A an

W1 is short, b

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nal of DC voltm

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ut is turned ON

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er 1 whether th

umption duringStandby-modermal-mode opeetween standbGND-terminal.2.2V.

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meter 1 to TP

meter 2 to TP3

N.

r-pin of SW1 b

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he voltage-dro

Figure 1

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

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wer output turn

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1 and negativ

3 and negativ

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1. Connection

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orting betweennormal-mode

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ns off.

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e-terminal to G

e-terminal to T

e-terminal to T

mediate-termi

t caused by th

Diagram

al operation, EJumper-pin o

n intermediatee operation bwhen the vol

side terminal.

minal to GND-te

GND-terminal

TP2 for input-v

TP4 for output

nal and ON-si

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

8.Dec

erminal with a

with a pair of

voltage measu

t-voltage mea

ide terminal.

tance.

can be switcheen intermedON-side term

Jumper-pin anunder 0.3V, a

+

-

+

-

V

c.2014 Rev.0

a pair of wires.

wires.

urement.

surement.

hed by controliate-terminal

minal. nd controlling and normal-m

Load

DC Voltmete

001

.

lling and

the ode

er 2

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BD9D320EFJ-EVK-001

8.Dec.2014 Rev.001© 2014 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp

8 VIN

1 EN

4 SS

R4

C6S W1

O N

OFF

C2 C3 TP 1

V I N

GND

SW 6

L1C4 C5

TP 3

VOUT

GND

FB 2

R3

R1

U1

BD9D320EFJ

TP 2

C 1

TP 4

9E

PA

D

J 1

J 2

3 VREG

BOOT 7

R2

C9

5 GND

C7

C8

2 C1, C6 Ceramic Capacitor 0.1µF 50V, B, ±20% GRM188B31H104MA92 MURATA 1608

2 C2, C3 Ceramic Capacitor 10µF 35V, B, ±10% GRM32EB3YA106KA12 MURATA 3225

2 C4, C5 Ceramic Capacitor 22µF 10V, B, ±10% GRM31CB31A226KE19 MURATA 3216

1 C7 Ceramic Capacitor 1µF 25V, B, ±10% GRM188B31E105KA75 MURATA 1608

1 C8 Ceramic Capacitor 3300pF 50V, B, ±10% GRM188B11H332KA01 MURATA 1608

0 C9 Ceramic Capacitor - Not installed - - 1608

1 L1 Inductor 2.2µH ±30%, DCR=19mΩmax, 5.5A CLF7045T-2R2N TDK 7269

1 R1 Resistor 68kΩ 1/10W, 50V, 1% MCR03ERPF6802 ROHM 1608

1 R2 Resistor 5.1kΩ 1/10W, 50V, 1% MCR03ERPF5101 ROHM 1608

1 R3 Resistor 22kΩ 1/10W, 50V, 1% MCR03ERPF2202 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 BD9D320EFJ 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 = 5.08V to 18V, VOUT = 3.3V

Figure 2. BD9D320EFJ-EVK-001 Circuit Diagram Bill of Materials

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BD9D320EFJ-EVK-001

8.Dec.2014 Rev.001© 2014 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp

Layout

Figure 3. Top Silk Screen (Top view)

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

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BD9D320EFJ-EVK-001

8.Dec.2014 Rev.001© 2014 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp

Figure 5. Top Side Layout (Top view)

Figure 6. L2 Layout (Top view)

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BD9D320EFJ-EVK-001

8.Dec.2014 Rev.001© 2014 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp

Figure 7. L3 Layout (Top view)

Figure 8. Bottom Side Layout (Top view)

BD

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Effi

cien

cy(%

)O

utpu

tVol

tage

Cha

nge

(%)

D9D320EF

2014 ROHM Coww.rohm.co.jp

0

10

20

30

40

50

60

70

80

90

100

0

Effi

cien

cy (

%)

-1.5

-1

-0.5

0

0.5

1

1.5

0

Out

put V

olta

ge C

hang

e (%

)

FJ-EVK-00

o., Ltd. All rights

1

Lo

0.5 1

Lo

Figure 9. Eff

Figure 11

01

reserved.

oad Current (A

1.5

oad Current (A

fficiency vs Lo

1. Load Regul

2

A)

VIN = 12VVO = 3.3V

2 2.5

A)

VIN = 12VVO = 3.3V

ad Current

ation

7/8

3O

utpu

tVol

tage

Cha

nge

(%)

3

VV

VO (A100m

IO: 1

-2.5

-2

-1.5

-1

-0.5

0

0.5

1

1.5

2

2.5

0O

utpu

t Vol

tage

Cha

nge

(%)

AC) mV/div

1A/div

5

Inp

Figure

Figure 12. Lo

IO: 0.5

8.Dec

10

put Voltage (V

10. Line Regu

oad Transient

Time s

VV

5A→3A→0.5A

c.2014 Rev.0

15

V)

VO = 3.3IO = 2.0

ulation

Characteristic

scale 100μs/d

VIN = 12V VO = 3.3V

A

001

20

3V0A

cs

div

BD

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D9D320EF

2014 ROHM Coww.rohm.co.jp

VIN (AC) 50mV/div

VIN (AC) 50mV/div

VIN

5V/

EN5V/

VO

2V/

VIN

5V/d

EN

5V/d

VO 2V/d

FJ-EVK-00

o., Ltd. All rights

Figure 1

Figure

Figure

N /div

N /div

/div

div

div

div

01

reserved.

3. Input VoltagVIN = 12V

e 15. Start-up VIN = 12V

e 17. Start-up VIN = 12V

T

Ti

T

T

ge Ripple WavV, VO = 3.3V

EN = VIN V, VO = 3.3V, IO

by EN V, VO = 3.3V, IO

ime scale 1μ

ime scale 1μ

Time scale 1

Time scale 1m

IO = 0A

IO = 3.0

8/8

ve

O = 0A

O = 0A

s/div

s/div

ms/div

ms/div

A

0A

Figure 16. PV

Figure 18. PV

VIN (AC) 50mV/div

VIN (AC) 50mV/div

Figure 14. O

Power-down EVIN = 12V, VO =

Power-down byVIN = 12V, VO =

Time

Time

8.Dec

Output VoltageVIN = 12V, VO

N = VIN = 3.3V, IO = 0A

y EN = 3.3V, IO = 0A

Tim

Tim

scale 1ms/d

e scale 2s/di

c.2014 Rev.0

Ripple Wave

O = 3.3V

A

A

e scale 1μs/d

e scale 1μs/d

iv

v

IO = 0A

IO = 3.0A

001

div

div

A

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

Notice

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N o t e s

The information contained herein is subject to change without notice.

Before you use our Products, please contact our sales representative and verify the latest specifica-tions :

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