Rohm Switching Regulator Series Manual de usuario

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No. 60AP001E Rev.001

2017.4

No. 60UG018E Rev.002

APR.2017

User’s Guide

Switching Regulator Series

Step-Down DC/DC Converter

BD9E303EFJ-LB Evaluation Board

BD9E303EFJ-EVK-001

BD9E303EFJ-EVK-001Evaluationboarddeliversanoutput5.0voltsfromaninput7.0to36voltsusingBD9E303EFJ-LB,asynchronousrectification

step-down DC/DC converter integrated circuit, with output current rating ofmaximum 3A. The output voltage can be set by changing the external

parts ofcircuit andtheloop-responsecharacteristicsalso canbeadjustedbythephasecompensationcircuit.

Performance specification

Theseare representative values,and itis nota guaranteedagainst the characteristics.

VIN = 24V,VOUT = 5.0V,Unlessotherwisespecified.

Parameter

Min

Typ

Max

Units

Conditions

Input VoltageRange

7.0

Output Voltage

5.0

R1=30kΩ, R2=7.5kΩ

Output VoltageSettingRange

VIN×0.06

VIN×0.8

Output CurrentRange

LoopBandWidth

18.2

kHz

Phase Margin

70.8

degrees

Input RippleVoltage

300

mVpp

IO= 3A

Output RippleVoltage

mVpp

IO= 3A

Output RisingTime

2.2

Operating Frequency

300

kHz

Maximum Efficiency

91.1

IO= 1.2A

(NOTE1) However,(VIN×0.06) ≥ 1.0V

(NOTE1)

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User’s Guide

BD9E303EFJ-EVK-001

No. 60UG018E Rev.002

APR.2017

Operation Procedures

1. Necessary equipments

(1) DC power-supply of 7.0V to 36V/3A

(2) Maximum 3A load

(3) DC voltmeter

2. Connecting the equipments

(1) DC power-supply presets to 24V and then the power output turns off.

(2) The maximum load should be set at 3A and over it will be disabled.

(3) Check Jumper pin of SW1 is short, between intermediate-terminal and OFF-side terminal.

(4) Connect positive-terminal of power-supply to VIN+ terminal and negative-terminal to GND-terminal with a pair of wires.

(5) Connect load’s positive-terminal to VOUT+ terminal and negative-terminal to GND-terminal with a pair of wires.

(6) Connect positive-terminal of DC voltmeter 1 to TP1 and negative-terminal to TP2 for input-voltage measurement.

(7) Connect positive-terminal of DC voltmeter 2 to TP3 and negative-terminal to TP4 for output-voltage measurement.

(8) DC power-supply output is turned ON.

(9) IC is enable (EN) by shorting Jumper-pin of SW1 between intermediate-terminal and ON-side terminal.

(10) Check DC voltmeter 2 displays 5.0V.

(11) The load is enabled.

(12) Check at DC voltmeter 1 whether the voltage-drop (loss) is not caused by the wire’s resistance.

Figure 1. Connection Diagram

Enable-Pin

To minimize current consumption during standby-mode and normal operation, Enable-mode can be switched by controlling EN pin

(3pin) of the IC. Standby-mode is enabled by shorting Jumper-pin of SW1 between intermediate-terminal and OFF-side terminal

and normal-mode operation by shorting between intermediate-terminal and ON-side terminal.

It also can be switched between standby-mode and normal-mode operation by removing Jumper-pin and controlling the voltage

between EN and GND-terminal. Standby-mode is enabled when the voltage of EN is under 0.8V, and normal-mode operation when

it is over 2.5V.

DC Voltmeter 1

DC Voltmeter 2

DC Power

Load

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User’s Guide

BD9E303EFJ-EVK-001

No. 60UG018E Rev.002

APR.2017

1 BOOT

2 VIN

7 PGND

3 EN

4 AGND

SW 8

COMP 6

FB 5

BD9E303EFJ-LB

L1 C4

VIN

VOUT

SW1

OFF

GND

J1TP1

TP2

TP3

TP4

GND

TP5

TP6

9 E-PAD

Circuit Diagram

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

Figure 2. BD9E303EFJ-EVK-001 Circuit Diagram

Bill of Materials

2 C1, C7 Ceramic Capacitor

0.1µF 50V, B, ±20% GRM188B31H104MA92 MURATA 1608

1C2 Ceramic Capacitor

10µF 50V, B, ±10% GRM32EB31H106KA12 MURATA 3225

0C3 Ceramic Capacitor -

Not installed - - 3225

2 C4, C5 Ceramic Capacitor

22µF 10V, B, ±10% GRM31CB31A226KE19 MURATA 3216

1C6 Ceramic Capacitor

6800pF 50V, B, ±10% GRM188B11H682KA01 MURATA 1608

0C8 Ceramic Capacitor

- Not installed - - 1608

1L1 Inductor

10µH ±20%, DCR=24mΩmax, 4.49A NS10155T100MNV TAIYO YUDEN 101101

1R1 Resistor

30kΩ 1/10W, 50V, 1% MCR03EZPFX3002 ROHM 1608

1R2 Resistor

7.5kΩ 1/10W, 50V, 1% MCR03EZPFX7501 ROHM 1608

1R3 Resistor

15kΩ 1/10W, 50V, 1% MCR03EZPFX1502 ROHM 1608

1R4 Resistor

0Ω Jumper MCR03EZPJ000 ROHM 1608

PH-1x03SG USECONN -

61300311121 Wurth Electronics Inc. -

1U1 IC

- Buck DC/DC Converter BD9E303EFJ-LB ROHM HTSOP-J8

TB111-2-2-U-1-1 Alphaplus Connectors & Cables -

OSTTC022162 On Shore Technology Inc -

MJ254-6BK USECONN -

969102-0000-DA 3M -

Jumper

Jumper pin for SW1

J1, J2

Terminal Block

2 contacts, 15A, 14 to 22AWG

SW1

Pin header

2.54mm × 3 contacts

Reference

Designator

Count

Manufacturer

Part Number

Manufacturer

Configuration

(mm)

Type

Value

Description

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User’s Guide

BD9E303EFJ-EVK-001

No. 60UG018E Rev.002

APR.2017

Layout

PCB size: 50mm×50mm×1.6mm

Figure 3. Top Silk Screen (Top view)

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

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BD9E303EFJ-EVK-001

No. 60UG018E Rev.002

APR.2017

Figure 5. Top Side Layout (Top view)

Figure 6. L2 Layout (Top view)

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BD9E303EFJ-EVK-001

No. 60UG018E Rev.002

APR.2017

Figure 7. L3 Layout (Top view)

Figure 8. Bottom Side Layout (Top view)

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User’s Guide

BD9E303EFJ-EVK-001

No. 60UG018E Rev.002

APR.2017

100

0 1 2 3

Efficiency (%)

Load Current (A)

VIN=7V

VIN=24V

VO=5.0V

VIN=36V

VIN=12V

-1

-0.8

-0.6

-0.4

-0.2

0.2

0.4

0.6

0.8

510 15 20 25 30 35 40

Output Voltage Change (%)

Input Voltage (V)

IO=1.0A

-0.5

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

0 0.5 1 1.5 2 2.5 3

Output Voltage Change (%)

Load Current (A)

VIN=12V

VIN=24V

VO=5.0V

Reference Application Data

Figure 9. Efficiency vs Load Current

Figure 10. Line Regulation

Figure 11. Load Regulation

Figure 12. Load Transient Characteristics

VO (AC)

200mV/div

IO: 1A/div

Time scale 1ms/div

VIN = 12V

VO = 5.0V

VIN = 24V

VO = 5.0V

IO: 1A→3A→1A

VO (AC)

200mV/div

Time scale 1ms/div

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User’s Guide

BD9E303EFJ-EVK-001

No. 60UG018E Rev.002

APR.2017

Figure 13. Loop Response VIN = 12V, VO= 5.0V, IO= 3A

Frequency (Hz)

Gain (dB)

Phase (deg)

Phase

Gain

fC= 16.6kHz

Phase margin = 63.5deg

Gain margin = 25.1dB

fC= 18.2kHz

Phase margin = 70.8deg

Gain margin = 22.8dB

Figure 14. Loop Response VIN = 24V, VO= 5.0V, IO= 3A

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User’s Guide

BD9E303EFJ-EVK-001

No. 60UG018E Rev.002

APR.2017

Figure 15. Input Voltage Ripple Wave

VIN = 12V, VO= 5.0V

VIN (AC)

50mV/div

Time scale 2μs/div

VIN (AC)

100mV/div

Figure 16. Input Voltage Ripple Wave

VIN = 24V, VO= 5.0V

IO= 0A

IO= 3A

VIN (AC)

50mV/div

VIN (AC)

100mV/div

IO= 0A

IO= 3A

Time scale 2μs/div

IO= 0A

IO= 3A

VO (AC)

10mV/div

VO (AC)

10mV/div

Figure 17. Output Voltage Ripple Wave

VIN = 12V, VO= 5.0V

Figure 18. Output Voltage Ripple Wave

VIN = 24V, VO= 5.0V

Time scale 2μs/div

IO= 0A

IO= 3A

VO (AC)

10mV/div

VO (AC)

10mV/div

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User’s Guide

BD9E303EFJ-EVK-001

No. 60UG018E Rev.002

APR.2017

Figure 19. Start-up EN = VIN

VIN = 12V, VO= 5.0V, IO= 0A

VIN

5V/div

2V/div

Time scale 100ms/div

Figure 20. Power-down EN = VIN

VIN = 12V, VO= 5.0V, IO= 0A

VIN

10V/div

2V/div

Time scale 100ms/div

Figure 21. Start-up EN = VIN

VIN = 24V, VO= 5.0V, IO= 0A

Figure 22. Power-down EN = VIN

VIN = 24V, VO= 5.0V, IO= 0A

VIN

5V/div

2V/div

Time scale 1ms/div

Time scale 1s/div

Figure 23. Start-up by EN

VIN = 12V, VO= 5.0V, IO= 0A

Figure 24. Power-down by EN

VIN = 12V, VO= 5.0V, IO= 0A

VIN

10V/div

2V/div

Time scale 1ms/div

Time scale 1s/div

Figure 25. Start-up by EN

VIN = 24V, VO= 5.0V, IO= 0A

Figure 26. Power-down by EN

VIN = 24V, VO= 5.0V, IO= 0A

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