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An IMPORTANT NOTICE at the end of this TI reference design addresses authorized use, intellectual property matters and other important disclaimers and information.
TIDT151 - December 2019 Half-Bridge Point-of-Load Converter Reference Design With GaN Technology 1
1. Connect the input and output supplies as shown in Figure 4, but do not power them on yet.
2. Connect kelvin voltage sense (from multimeters) to test points TP3, TP4, TP12 and TP14.
3. Ensure the enable (EN) switch is set to off.
4. Connect and power the bias supply between 6 V and 9 V. An on-board LDO provides 5 Vand 3.3 V to the power and control circuitry.
5. Power up the input supply and set to the desired input voltage. Set the current limit to 2A.
6. Slide the EN switch to the on position to start the converter. The output voltage will ramp upand the PGOOD LED should light to indicate the output voltage is in regulation.
7. Enable the electronic load and set to the desired load current
8. To use the onboard dynamic load, slide the DynLoad switch to the on position to enable the120mOhm dynamic Load. This adds 120mOhms in parallel to the load. It can be usedisolated or with another load as a base current.
1.3 Turning off the Board
1. Slide the EN switch to the off position.
2. Disable the input voltage supply.
3. Disable the electronic load.
4. Disable the bias supply.
1.4 Notes
If the converter shuts off due to UVP or over-current protection (OCP), the controller IC must
be restarted to re-enable the converter. Shut down the converter by following the steps in
Section 1.3, then restart the converter according to the steps in Section 1.2.
To vary the output voltage, the I2C bus must be used to communicate with the TPS53632G.
Consult the user guide for the TPS53632G for the necessary VID protocol. The EVM uses
the TPS53632G’s default I2C address. Device Address: 40h. Program Register 00h with
28h for 0.65V, and 3C for 0.85V.
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4 Half-Bridge Point-of-Load Converter Reference Design With GaN Technology TIDT151 - December 2019
Figure 9 Load transient used was the on-board dynamic load. Capture shows the Ramp up load transient response. Load goes between 0 A and 5.41 A. Vin = 28 V and Vout = 0.65 V.
Figure 10 Load transient used was the on-board dynamic load. Capture shows the Ramp up load transient response. Load goes between 0 A and 5.41 A. Vin = 28 V and Vout = 0.65 V.
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TIDT151 - December 2019 Half-Bridge Point-of-Load Converter Reference Design With GaN Technology 15
Figure 11 Load transient used was the on-board dynamic load. Capture shows the Ramp up load transient response. Load goes between 0 A and 7.08 A. Vin = 28 V and Vout = 0.85 V.
Figure 12 Load transient used was the on-board dynamic load. Capture shows the Ramp up load transient response. Load goes between 0 A and 7.08 A. Vin = 28 V and Vout = 0.85 V.
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