Rohm BD7F205EFJ-C Manuale utente

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65UG028E Rev.001

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User's Guide

Figure 1. BD7F205EFJ-EVK-001

Isolated DC/DC Converters ICs

Built-in Automotive Switching MOSFET

Isolated Flyback Converter ICs

BD7F205EFJ-C Evaluation Board

BD7F205EFJ-EVK-001

Overview

This evaluation board outputs an isolated 6.2 V, 16.5 V and 6.2 V voltage from an input of 8 V to 32 V, and can output a maximum

output power 6 W.

BD7F205EFJ-C is an isolated flyback converter that does not require a photocoupler.

Feedback circuit by the transformer’s tertiary winding or photocouplers becomes unnecessary, contributing to reduction of set

parts.

It also has a number of built-in protection functions that enable the design of isolated power supply applications for high reliability.

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Performance Specifications

This is a typical value and does not guarantee the characteristics.

Unless otherwise specified, VIN = 12 V, IOUT = 0.1 A, Ta = 25 °C

Parameter

Symbol

Min

Typ

Max

Units

Conditions

Input voltage range

VIN

Output voltage 1

VOUT1

5.5

6.2

6.9

IOUT1 = 0.1 A

Output voltage 2

VOUT2

14.8

16.5

18.2

IOUT2 = 0.1 A

Output voltage 3

VOUT3

5.5

6.2

6.9

IOUT3 = 0.1 A

Output current 1

IOUT1

0.3

Output current 2

IOUT2

0.1

Output current 3

IOUT3

0.3

Maximum output power

POUT

Standby power

PINSTBY

100

IOUT = 0 A VIN = 12 V

Power Supply Efficiency

POUT = 2 W

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User's Guide

BD7F105EFJ-EVK-001

Figure 2. Connection Diagram

Operating Procedure

1. Necessary equipment

(1) DC power supply of V to 32 V, 10 W / 5 A or more

(2) Load device up to 5 W

(3) DC voltmeter

2. Connecting the Equipment

(1) Preset the DC power supply to 8 V to 32 V and turn off the power output.

(2) Set the load to less than or equal to the rated current of each output and disable the load.

(3) Connect the positive terminal of the power supply to the VIN terminal and the negative terminal to the GND

terminal with a pair of wires.

(4) Connect the positive terminal of the load to VOUT terminal and the negative terminal to GND terminal with a

pair of wires.

(5) When connecting a wattmeter, connect as shown below. (Refer to your power meter User's Manual for more

information)

(6) Connect the positive terminal of the DC voltmeter to VOUT terminal and the negative terminal to GND terminal

for measuring the output voltage.

(7) Turn on the output of the DC power supply.

(8) Check that the DC voltmeter display is at the set voltage.

(9) Activates the load.

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65UG028E Rev.001

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User's Guide

BD7F105EFJ-EVK-001

Figure 3. Circuit diagram

Application circuit

The evaluation board operates with an average frequency of approximately 363 kHz.

Monitoring the flyback voltage due to the voltage at the output provides primary-side feedback control that eliminates the

need for photocouplers and auxiliary windings.

Operation starts when the VIN pin voltage exceeds UVLO detect voltage of 3.4 V (Typ) and SDXEN pin Enable pin voltage of

2.0 V (Typ).

The circuit diagram of the demonstration board is shown in the figure below, and the parts list is shown on page 12.

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BD7F105EFJ-EVK-001

GND

SDX/EN

L_COMP

REF

VIN

N.C.

EXP-PAD

(TOP VIEW)

Figure 4. Pin layout drawing

Outline of BD7F205EFJ-C

Features

◼AEC-Q100 (Grade-1)

◼No Need for Optocoupler and Third Winding of

Transformer

◼Output voltage is set by two external resistors and

transformer winding ratio.

◼Uses proprietary adaptive ON-time control

technology

◼Highly efficient light load mode (PFM operation)

◼Shutdown and Enable control

◼Burst voltage design possible

◼60 V Built-in-switching MOSFET

◼Spread frequency spectrum

◼Soft start function

◼Load current compensation function

◼Various protection functions

Undervoltage protection (UVLO)

Overcurrent protection (OCP)

Overheat protection (TSD)

REF pin open protection (REFOPEN)

Short-circuit protection (SCP)

Battery short-circuit protection (BSP)

Critical Characteristics

◼Input voltage range :

VIN terminal 3.4 V to 42.0 V

SW pin to 60 V

◼Switching frequency : 363 kHz (Typ)

◼Reference voltage accuracy: ±2.8 % (Typ)

◼Shutdown current 0 μA (Typ)

◼Operating temperature range -40 °C to +125 °C

Package W (Typ) x D (Typ) x H (Max)

HTSOP-J8 4.9 mm x 6.0 mm x 1.0 mm

Applications

Insulated power supply for automotive use (E-Comp, Inverter

etc)

Insulated power supply for industrial equipment

Pin Layout

PIN ASSIGNMENT

No.

Pin name

Function

GND

GND terminal

SDX/EN

Shutdown/Enable control pin

L_COMP

Load current compensation value setting pin

REF

Output voltage setting pin

N.C.

No Connect

Switching output pin

VIN

Power input terminal

EXP-PAD

Rear heat dissipation pin

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BD7F105EFJ-EVK-001

Figure 5. Output Voltage1 vs Output Current1

IOUT2=30mA, IOUT3=50mA

Figure 6. Output Voltage2 vs Output Current1

IOUT2=30mA, IOUT3=50mA

Figure 7. Output Voltage3 vs Output Current1

IOUT2=30mA, IOUT3=50mA

Figure 8. Efficiency vs Output Current1

IOUT2=30mA, IOUT3=50mA

Measurement data

1. Load regulation

5.2

5.6

6.0

6.4

6.8

7.2

7.6

0 0.1 0.2 0.3

VOUT3[V]

IOUT1[A]

VIN=8V

VIN=12V

VIN=18V

VIN=32V

50.0

55.0

60.0

65.0

70.0

75.0

80.0

85.0

90.0

0 0.1 0.2 0.3

Efficiency[%]

IOUT[A]

VIN=8V

VIN=12V

VIN=18V

VIN=32V

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User's Guide

BD7F105EFJ-EVK-001

Figure 9. Output Voltage1 vs Output Current1

IOUT2=100mA, IOUT3=300mA

Figure 10. Output Voltage2 vs Output Current1

IOUT2=100mA, IOUT3=300mA

Figure 11. Output Voltage3 vs Output Current1

IOUT2=100mA, IOUT3=300mA

Figure 12. Efficiency vs Output Current1

IOUT2=100mA, IOUT3=300mA

Measured data-continued

5.2

5.6

6.0

6.4

6.8

7.2

7.6

0 0.1 0.2 0.3

VOUT1[V]

IOUT1[A]

VIN=8V

VIN=12V

VIN=18V

VIN=32V

15.0

15.5

16.0

16.5

17.0

17.5

18.0

18.5

19.0

0 0.1 0.2 0.3

VOUT2[V]

IOUT1[A]

VIN=8V

VIN=12V

VIN=18V

VIN=32V

5.2

5.6

6.0

6.4

6.8

7.2

7.6

0 0.1 0.2 0.3

VOUT3[V]

IOUT1[A]

VIN=8V

VIN=12V

VIN=18V

VIN=32V

50.0

55.0

60.0

65.0

70.0

75.0

80.0

85.0

90.0

0 0.1 0.2 0.3

Efficiency[%]

IOUT[A]

VIN=8V

VIN=12V

VIN=18V

VIN=32V

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User's Guide

BD7F105EFJ-EVK-001

Figure 13. Output Voltage1 vs Input Voltage

IOUT1=100mA, IOUT2=100mA, IOUT3=300mA

Figure 14. Output Voltage2 vs Input Voltage

IOUT1=100mA, IOUT2=100mA, IOUT3=300mA

Figure 15. Output Voltage3 vs Input Voltage

IOUT1=100mA, IOUT2=100mA, IOUT3=300mA

Figure 16. Frequency vs Input Voltage

IOUT1=100mA, IOUT2=100mA, IOUT3=300mA

Measured data-continued

2. Line regulation

5.2

5.6

6.0

6.4

6.8

7.2

7.6

010 20 30 40

VOUT1[V]

VIN[V]

VOUT1

15.0

15.4

15.8

16.2

16.6

17.0

17.4

17.8

18.2

18.6

19.0

010 20 30 40

VOUT2[V]

VIN[V]

VOUT2

5.2

5.6

6.0

6.4

6.8

7.2

7.6

010 20 30 40

VOUT3[V]

VIN[V]

VOUT3

300

310

320

330

340

350

360

370

380

390

400

010 20 30 40

VOUT3[V]

VIN[V]

Freq

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65UG028E Rev.001

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User's Guide

BD7F105EFJ-EVK-001

Figure 17. MOSFET Waveform

Vin = 12 V, IOUT1,3 = 0.1 A, IOUT2 = 0.05 A

Figure 18. MOSFET Waveform

Vin = 12 V, IOUT1,3 = 0.3 A, IOUT2 = 0.1 A

Figure 21. Output voltage ripple Waveform

VIN = 12 V / IO1,2,3=0.1, 0.05, 0.1 A

Figure 22. Output voltage ripple Waveform

VIN = 12 V / IO1,2,3=0.3, 0.1, 0.3 A

Measured data-continued

3. Switching waveform

4. Load response waveform

5. Output ripple voltage waveform

VSW (20V/div)

VOUT1 (10V/div)

VSW (20V/div)

VOUT1 (10V/div)

VOUT2 (10V/div)

VOUT3 (10V/div)

VOUT2 (10V/div)

VOUT3 (10V/div)

VSW (20V/div)

VOUT1 (1Vac/div)

VOUT2 (1Vac/div)

VOUT3 (1Vac/div)

IOUT1 (200mA/div)

Figure 19. Load response

Vin = 12 V, IOUT2 = 0.05 A, IOUT3 = 0.1 A

IOUT1 = 30 mA to 300 mA

VOUT2 (1Vac/div)

VOUT1 (1Vac/div)

VOUT3 (1Vac/div)

IOUT2 (200mA/div)

Figure 20. Load response

Vin = 12 V, IOUT1 = 0.1 A, IOUT3 = 0.1 A

IOUT2 = 10 mA to 100 mA

VOUT1 (50mVac/div)

VOUT2 (50mVac/div)

VOUT3 (50mVac/div)

VOUT1 (50mVac/div)

VOUT2 (50mVac/div)

VOUT3 (50mVac/div)

*This ripple is due to spread spectrum.

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65UG028E Rev.001

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User's Guide

BD7F105EFJ-EVK-001

Figure 23. Start Up Waveform

Figure 24. Shut Down Waveform

Figure 25. VOUT Short Waveform

Vin = 8 V

Figure 26. VOUT Short Waveform (ZOOM)

Vin = 8 V

Figure 27. VOUT Short Waveform

Vin = 15 V

Figure 28. VOUT Short Waveform (ZOOM)

Vin = 15 V

Measured data-continued

6. Startup/stop waveform

7. Output short waveform

VSW (20V/div)

VOUT1 (10V/div)

VSW (20V/div)

VOUT1 (10V/div)

VIN (5V/div)

VIN (10V/div)

VSW (20V/div)

ISW (2A/div)

VOUT (20V/div)

VSW (20V/div)

VIN (10V/div)

ISW (2A/div)

10ms/div

500us/div

VIN (10V/div)

VSW (20V/div)

ISW (2A/div)

VSW (20V/div)

VIN (10V/div)

10ms/div

500us/div

VOUT2 (10V/div)

VOUT3 (10V/div)

VOUT2 (10V/div)

VIN (10V/div)

VSW (20V/div)

ISW (2A/div)

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