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GE Application Note

Application Guidelines for Non Isolated Converters AN15-001 Guidelines for use of Dual Output Modules

March 27, 2015 ©2015 General Electric Company. All rights reserved. Page 2

Features

Single Common Input Both outputs are fed from a single common input. Each output stage is switched 180° out of phase. This results in half the input ripple of two individual modules switching simultaneously. This results in a reduction of the input capacitance to achieve the same input ripple level as a single input module.

The Dual output module also offers external Synchronization capability for applications that need access to control the switching phase angle of the individual module or slightly adjust the switching frequency.

In the case of the digital version of the dual output module, only one set of address resistors are required for both the output stages. Having a single I2C address not only reduces the used addresses on the I2C bus, but also the bus loading. The modules support the PMBusTM# Page command which allows the external system controller to use the same address for both outputs and communicate with each stage by switching the page command. More information regarding this is available in the datasheet for the Dual Output product.

Individual Control of each output stage There is no loss of functionality while using dual output modules. Users have access to the following capabilities:

1. Output Voltage Setting through separate Trim resistors.

2. Remote On/Off control for each output.

3. PowerGood signal for each output.

4. External Voltage Sense for each output.

5. Tunable Loop Control for each output.

PMBus Commands Apart from the above analog capabilities, the Dual output modules support a substantial number of relevant PMBus commands. The modules offer voltage, current and temperature measurement of each stage. They also offer digital on/off control, voltage trim capability and rise time control. Sequencing has been implemented through the PMBus feature set by allowing the user to adjust the Turn On and Turn Off

delay as a multiple of the rise time setting.

The following view of the ProGUI configuration window summarizes the digital adjustments and readback available

Figure 4. ProGUI Dual Output POL Parameter Window.

# The PMBus name and logo are registered trademarks of the System Management Interface Forum (SMIF)

Figure 5. ProGUI Module Status Window.

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