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User’s Guide
HB2637L-EVK-301
© 2022 ROHM Co., Ltd.
No. 65UG002E Rev.001
Apr. 2022
CO1 is the board power supply input connector. A voltage of 15~18V needs to be applied to this connector to get the board running.
The 5V supply required for the board as well as the isolated power supply required for the gate drivers are powered through this
supply. CO2 is the interface for PWM signals required for the gate driver. Pin1 and Pin5 of connector CO2 are high side gate
driver input PWM and low side gate driver input PWM respectively. Additionally, ton this board two BNC connectors are also
provided, through which user can easily apply PWM signals directly from a pulse generator.
The other connectors available on the board CO3, CO4, CO5, CO6 are power connectors which must be connected to DC+, DC-,
DC- and switch node respectively.
Figure 4: Top view of the board with all connectors marked
3.2
LED Indications
A total of three power supplies are generated on the board. The board has a LDO for generating 5V from the input supply of
15~18V on the connector CO1. This 5V is necessary for powering the input side of the isolated gate drivers. The other two power
supplies are the isolated power supplies required to supply the HV side of the isolated gate drivers. For each of the power supplies
available on board, a LED indication has been provided. As soon as the input voltage of 15-18V has been applied to the board,
the LDO generates the 5V and lights up the LED “5V Supply”. Simultaneously the isolated power supplies for each of the drivers
are also available and the LEDs “HS Supply” and LS Supply” lights up.
Figure 5 shows the location of these LEDs. It must be noted that the board is functional only if all these three LEDs are lit.
CO3
CO6
CO4
CO5
CO1
CO2
BNC for HS and LS PWM
Pin 1
Pin 6
