Selecting/Installing Gate Drive Resistors on the -66848 and - 66849 Modules

Low-Side Gate Drive Module PD1000-66848 and High-Side Module PD1000-66849 do not have gate resistors pre-installed. This allows you to install gate resistors of any value necessary for the tests you are performing. You must solder appropriate resistors onto both modules.

The actual Gate Drive Resistors are SMD resistors. Depending whether you choose to use a single-path gate drive or a split-path determines the actual resistor values and configuration. Figures below show the resistor arrangement for a Single-Path application and for a Split-Path Configuration.

Resistors are either an Imperial size 1206 (metric 3216, L = 3.20 mm, W = 1.60 mm) and is used in measuring the gate drive current. or imperial size 0603 (metric 1608, L = 1.60 mm, W = 0.80 mm). The 0603 resistor is smaller self destructs earlier in case of over current to protect the oscilloscope and probe.

Use identical resistors on the Low-Side and High-Side Gate Drive modules.

 

Installing Common-Path Gate Drive Resistors

Installing Split-Path Gate Drive Resistors

 

IMPORTANT: After installing custom gate resistors on the modules, the modules must be initialized and calibrated before use. Calibration measures the resistor value and stores it in the module’s EEPROM. Refer to 28V Gate Drive Module Calibration.

Installing Common-Path Gate Drive Resistors

Three SMD resistors must be installed on the module to create a Common-Path module.

RGON and RGSHARED gate drive resistors should be the same value. The resistors are in series and form the complete gate drive resistor. For example, if both resistors are 25 W, the total gate drive resistor value is 50 W. RGOFF may be a different value.

For Common-Path gate resistor, RC, must be a 0.0 W resistor. RGON, and RSHARED are always installed. RGOFF is never installed. The remaining solder pads are not used.

Installing Split-Path Gate Drive Resistors

Three SMD resistors must be installed on the module to create a Split-Path module.

RGON and RGSHARED gate drive resistors shoud be the same value. The resistors are in series and form the complete gate drive resistor. For example, if both resistors are 25 W, the total gate drive resistor value is 50 W. RGOFF may be a different value.

For Split-Path gate resistor, RC is never installed, RGON, RGOFF, and RSHARED are always installed. The remaining solder pads are not used.

How to Test the Gate Drive Resistor to Ensure Proper Installation

With a DMM, measure the values of the Gate resistors.