ON Semiconductor SECO-HVDCDC1362-15W15V -GEVB User Manual

SECO-HVDCDC1362-15W15V

-GEVB

15 W SiC High-Voltage Auxiliary Power Supply for HEV & BEV Applications Evaluation Board User's Manual

Introduction

SECO−HVDCDC1362−15W15V−GEVB is highly efficient and primary−side regulated (PSR) auxiliary power supply targeting HEV and EV automotive power trains. The design provides a stable 15 V output and 15 W over a wide input DC voltage range from 250 V to 900 V, and is therefore suitable for 400 V and 800 V battery systems.

The board employs the NCV1362 quasi−resonant peak current PSR flyback controller, the 3−lead cost−optimized NVHL160N120SC1 160 mW 1200 V silicon carbide (SiC) MOSFET, and the FFSD0665B−F085 SiC diode.

Thanks to the high blocking voltage capabilities and ultra−low gate charge (34 nC) value of the SiC FET, the switching losses are significantly reduced, and the board exhibits a superior efficiency for the application up to 86% in low line input conditions. The notable driving capabilities of the NCV1362 controller allows for direct operation of the SiC FET at 12V without a pre−driver, simplifying the layout and cutting down the component count.

The flyback transformer provides 4 kV isolation and is optimized to minimize the losses on the RCD snubber. Consequently the system effectively dampens the drain voltage overshoot at high line, and provides 100 V margin for the SiC FET. The board is fully realized with automotive qualified semiconductors and passive devices. Industrial grade replacements are also available.

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EVAL BOARD USER’S MANUA

(Top View)

(Bottom View)

Figure 1. Board Layout

Features

• NCV1362 (Automotive) / NCP1362 (Industrial) Quasi−resonant

Peak Current PSR Flyback Controller

• Fully Automotive Qualified Devices

• Vin = 240 V – 900 V DC Only

• Vout = 15 V / 15 W Continuous

• Electromagnetic Compatibility (EN 55015 Limits)

• High Efficiency up to 86%

• SiC FET Directly Operated at 12 V by the IC

• Excellent Thermal Performance

Applications

• HEV & EV Vehicles Auxiliary Power Supplies

• Automotive Powertrain Systems

• EV Charging and DC−DC Conversion

enefits

• Superior Efficiency with SiC Devices

• Stable Performance across a Wide Input

Voltage Range (250 Vdc – 900 Vdc )

• Reduced Bill−of−Material and

Cost−optimized

• Fully AEC−Q Qualified Parts

• EMC within EN 55015 Limits

• Single Layer PCB

ollateral

• NVHL160N120SC1

• NCV1362

• SECO−HVDCDC1362−15W15V−GEVB

• References

• Industrial DC−DC Conversion, Solar Inverts (with Industrial grade)

October, 2020 − Rev. 1

1 Publication Order Number:

EVBUM2752/D

SECO−HVDCDC1362−15W15V−GEVB

Scope and Purpose

The purpose of this user’s manual is to present the design of an auxiliary power supply with automotive qualified parts NCV1362 (NCP1362) and NVHL160N120SC1 SiC FET. The design was tested as described in this document but not

System Overview

qualified regarding safety requirements or manufacturing and operation over the complete operating temperature range or lifetime. The hardware is intended for testing under laboratory conditions and by trained specialists only.

Block Diagram

Figure 2. Evaluation Board Photo

Figure 3. Block Diagram

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SECO−HVDCDC1362−15W15V−GEVB

SPECIFICATION

Parameters

Values

Input

Voltage

250−900 VDC

Current

71 mA (Vin = 250 V), 22 mA (Vin = 900 V)

Output

Power

15 W

Voltage

15 VDC

Current per branch

1 A

Total current

1 A

Efficiency at full load

86% (Vin = 250 V)

Temperature at full load

98°C (Vin = 6 V), 74.5°C (Vin = 15 V), 76°C (Vin = 18 V)

Control

Core part

NCV1362

Topology

Flyback

Switching frequency

50 kHz

Operation mode

DCM

Primary side peak current

0.65 A

Construction

Board size

26.24 x 16.38 x 16.06 mm

Transformer

Dielectric insulation

4000 VAC, 1 min.

Inductance

1.70 mH ± 10%

Leakage inductance

20 mH typ. / 40 mH max.

Safety standard

IEC62368−1

Pollution degree

Application

HEV & EV vehicles, automotive powertrain systems, EV charging and DC−DC conversion

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Schematic

SECO−HVDCDC1362−15W15V−GEVB

Figure 4. Evaluation Board Schematic

TEST REPORT

This section presents the results of the tests conducted on the power supply.

• Efficiency DC/DC at input voltage range and full load

• Waveforms at 240V, 500V, 900V at full load / open

circuit

• Load transients 15%−85% and 15%−85% load

• Thermal camera view

• Electromagnetic compatibility

Efficiency DC/DC at Input Voltage Range and Full Load

Measured conditions:

• Output power Pout ~ 15 W

• Electronic load: Chroma 6147A used channel 3 as CRH

(constant resistance high mode 15 W → 1.0 A)

List of equipment:

• DC source: Magna−Power 0−1000V

• Power analyzer: Textronix PA3000

• Electronic load: Chroma

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Figure 5.

SECO−HVDCDC1362−15W15V−GEVB

Waveforms at 240 V, 500 V, 900 V at Full Load / Open Circuit

Measured conditions:

• Output power Pout ~ 15 W

• Electronic load: Chroma 6147A used channel 3 as CRH

(constant resistance high mode 15 Ohm −> 1.0A)

List of equipment:

• DC source: Magna−Power 0−1000V

• Power analyzer: Textronix PA3000

• Electronic load: Chroma

• Oscilloscope: Lecroy HDO8038

Figure 6. 250 V DC Full Load

Figure 7. 250 V DC Open Circuit

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SECO−HVDCDC1362−15W15V−GEVB

Figure 8. 500 V DC Full Load

Figure 9. 500 V DC Open Circuit

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