BD7682FJ-LB
Low Noise Quasi-Resonant Control DC/DC converter IC for AC/DC Converter

The BD7682FJ-LB is a quasi-resonant controller-type DC/DC converter optimized for products equipped with an electrical outlet. Quasi-resonant operation enables soft switching and helps to keep EMI low, while utilizing an external switching MOSFET and current detection resistor provides greater design flexibility. Additional features include a brown out function that monitors the input voltage for system optimization and a burst mode function for reducing power during light loads. Multiple protection functions are also incorporated to provide greater reliability, such as soft start, burst mode, per-cycle overcurrent limiter, and overvoltage/overload protection. A gate clamp circuit is built in as well for optimizing SiC MOSFET drive.

SCT2H12NZ(1700V SiC-MOSFET) and BD7682FJ-LB(AC/DC Converter IC) Evaluation Board
BD7682FJ-LB-EVK-402 [Input: AC 400-690V , Output: 24V DC]
Application Note , Presentation Document , Buy Evaluation Board
BD7682FJ-EVK-301 [Input: AC 210-480V DC 300-900V , Output: 12V DC]
Application Note, Evaluation Board User Guide, Quick Start Guide, Inquiry Evaluation Board

Click here for the board designed to fully evaluate BD7682FJ-LB. In addition you can choose from a variety of power and topology evaluation boards.

Product Detail

 
Part Number | BD7682FJ-LBE2
Status | Recommended
Package | SOP-J8
Unit Quantity | 2500
Minimum Package Quantity | 2500
Packing Type | Taping
RoHS | Yes

Specifications:

FB OLP

Auto Restart

ZT OVP

Latch

BR UVLO

Yes

External LATCH Function

No

AC Monitor Function

No

VH Terminal UVLO

No

Dynamic Over Current Detection

No

Frequency Reduction Function

Yes

Current Detection Resistors

External

FET

External

Controller Type

QR

Vin1(Min.)[V]

15.0

Vin1(Max.)[V]

27.5

SW Frequency (Max.)[kHz]

120.0

VCC OVP

Latch

BR PIN

Yes

Channel

1

Light Load mode

Yes

EN

No

Soft Start

Yes

Thermal Shut-down

Yes

Under Voltage Lock Out

Yes

Operating Temperature (Min.)[°C]

-40

Operating Temperature (Max.)[°C]

105

Package Size [mm]

4.9x6 (t=1.65)

Features:

  • Pin 8 : SOP-J8 Package (6.00mm × 4.90mm : 1.27mm pitch [TYP] )
  • Quasi-resonant type (low EMI)
  • Frequency reduction mode
  • Low current consumption (19µA), during standby
  • Low current consumption when no load (burst operation when light load)
  • Maximum frequency (120kHz)
  • CS Pin Leading-Edge Blanking
  • VCC UVLO (Under Voltage Drop Out protection)
  • VCC OVP (Over Voltage Protection)
  • Per-cycle over-current protection circuit
  • Soft start
  • ZT trigger mask function
  • Voltage protection function (brown out)
  • ZT OVP (Over Voltage Protection)
  • Gate-clamp circuit

Supporting Information

 

Overview

package

SiC is attracting much attention as a next-generation compound semiconductor due to its superior characteristics over silicon.。
Auxiliary power supplies used in high voltage, high power industrial equipment typically utilize high voltage (>1000V) silicon MOSFETs. But by replacing these with high efficiency SiC MOSFETs heat generation can be significantly reduced, eliminating the need for external parts such as heat sinks.
ROHM has recently expanded its considerable lineup by offering 1700V class SiC MOSFETs along with an evaluation board that facilitates performance verification and application development.

Evaluation Board

As a comprehensive semiconductor manufacturer, ROHM now offers ICs optimized for use with SiC devices, including the BD7682FJ-LB DC/DC converter control IC designed to maximize the performance of SiC power MOSFETs such as the SCT2H12NZ. An evaluation board (BD7682FJ-LB-EVK-402) integrating both products is also available.

Evaluation Power Supply Board(BD7682FJ-LB-EVK-402)

Key Features 1:Optimized for auxiliary power supplies in industrial equipment

Compared to 1500V silicon MOSFETs used in auxiliary industrial-grade power supplies, ROHM's SiC
power MOSFETs feature 8x lower ON resistance (1.15Ω) and a withstand voltage of 1700V. In addition, the TO-3PFM package delivers the necessary creepage distance (distance measured along the surface of the insulator) demanded by industrial equipment.

ON Resistance Comparison Application Example

Key Features 2:Achieve even higher efficiency by combining with ROHM's dedicated IC

AC/DC Inverter Efficiency Comparison: Si vs. SiC

Combining with ROHM's BD7682FJ-LB AC/DC converter control IC improves efficiency by up to 6% while minimizing heat generation, making it possible to simplify and reduce the size of heat dissipation components.

Lineup

Part No.PackagePolarityVDSSIDPD
(Tc=25℃)
RDS(ON)
VGS=18V
Qg
VGS=18V
NEW SCT2H12NZTO-3PFMNch1700V3.7A35W1.15Ω
(Typ.)
14nC
(Typ.)
NEW SCT2H12NYTO-268-2L4A44W
NEW SCT2750NY5.9A57W0.75Ω
(Typ.)
17nC
(Typ.)

Evaluation
Board

 
    • Evaluation Board
    • BD7682FJ-EVK-301
    • The AUX board is able to operate with both AC and DC input voltages. It is therefore possible to derive the power directly from the grid or from the system DC link

  • User's Guide Buy
    • Evaluation Board
    • BD7682FJ-LB-EVK-302
    • The BD7682FJ is an AC/DC quasi-resonant flyback controller IC from ROHM Semiconductor and offers an Auxiliary Power Supply Solution if combined with the 1700 V SiC MOSFET (SCT2H12NZ). The BD7682FJ and SCT2H12NZ combined together have been used to develop an isolated 100 W 24 V output auxiliary power solution with a very accurate voltage regulation.

  • User's Guide Buy
    • Evaluation Board
    • BD7682FJ-LB-EVK-402
    • BD7682FJ-LB-EVK-402 evaluation board outputs 24 V voltage from the input of 300 Vdc to 900 Vdc. The output current supplies up to 1 A. The BD768xFJ-LB series are Quasi-Resonant switching AC/DC converter for driving SiC (Silicon Carbide) MOSFET. Using external switching MOSFET and current detection resistors provides a lot of flexibility in the design.

  • User's Guide Buy

Design Resources

 

Tools

Calculation Tools

This Calculation Sheet supports the application circuit design of switching regulators. The sheet has formulas necessary for determining peripheral parts. You can easily determine the circuit parameters that meet the desired characteristics by setting the values according to the guidance.
  • Calculation-sheet for the circuit theoretical formula (QR)

2D/3D/CAD

  • BD7682FJ-LB Footprint / Symbol
  • SOP-J8 Footprint / Symbol
  • SOP-J8 3D STEP Data