EPC9058

EPC9058 Datasheet

Development Board EPC9058 Quick Start Guide

Part	Datasheet
EPC9058	EPC9058 (pdf)

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Development Board EPC9058 Quick Start Guide EPC2110 High Frequency Class-E Wireless Power Amplifier QUICK START GUIDE Demonstration System EPC9058 The EPC9058 is a high efficiency, differential mode Class-E amplifier development board that can operate up to 15 MHz, including MHz which is popular for wireless power. However, this board is not preconfigured for any particular frequency. The purpose of this development board is to simplify the evaluation process of class-E amplifier technology using FETs by allowing engineers to easily mount all the critical class-E components on a single board that can be easily connected into an existing system. This board may also be used for applications where a low side switch is utilized. Examples include, and are not limited to, push-pull converters, current-mode Class D amplifiers, common source bi-directional switch, and generic high voltage narrow pulse width applications such as LiDAR. The amplifier board features the 120 V rated EPC2110 eGaN FET. The amplifier is set to operate in differential mode and can be re-configured to operate in single-ended mode and includes the gate driver and logic supply regulator. For more information on the EPC2110 eGaN FETs please refer to the datasheet available from EPC at The datasheet should be read in conjunction with this quick start guide. Table 1 Performance Summary TA = 25°C EPC9058 Symbol Parameter Conditions Min Max Units Class-E Configuration 0 20 V Main Supply Voltage Current Mode Class-D Range Configuration Push-Pull Configuration 0 52 V Control Supply Input Range 7 12 V IOUT Switch Node Output Current each VOSC Oscillator Input Threshold Input ‘Low’ Input ‘High’ * Maximum current depends on die temperature actual maximum current will be subject to switching frequency, bus voltage and thermals. DETAILED DESCRIPTION The Amplifier Board EPC9058 Figure 1 shows the schematic of a single-ended, Class-E amplifier with ideal operation waveforms where the amplifier is connected to a tuned load such as a highly resonant wireless power coil. The amplifier has not been configure due to the specific design requirements such as load resistance and operating frequency. The design equations of the specific ClassE amplifier support components are given in this guide and specific values suitable for a RF amplifier application can then be calculated. Figure 2 shows the differential mode Class-E amplifier EPC9058 demo board power circuit schematic. In this mode the output is connected between Out 1 and Out A block-wave external oscillator with 50 % duty cycle and 0 V 5 V signal amplitude is used as a signal for the board. Duty cycle modulation is recommended only for advanced users who are familiar with the Class-E amplifier operation and require additional efficiency. The EPC9058 is also provided with a 5 V regulator to supply power to the logic circutis and gate driver. Adding a 0 Ω resistor in position R90 allows the EPC9058 to be powered using a single-supply voltage however in this configuration the maximum operating voltage is limited to between 7 V and 12 V. Single-ended Mode operation Although the default configuration is differential mode, the demo board can be re-configured for single-ended operation by shorting out C74 which disables only the drive circuit and connecting the load between Out 1 and GND only see figures 2 and 5 for details . Class-E amplifier operating limitations The impact of load resistance variation is significant to the performance of the Class-E amplifier, and must be carefully analyzed to select the optimal design resistance. EPC9058 amplifier board. The impact of load resistance RLoad Real part of ZLoad variation on the operation of the Class-E amplifier is shown in figure When operating a Class-E amplifier with a load resistance RLoad Real part of ZLoad that is below the design value see the waveform on the left of figure 3 , the load tends to draw current from the amplifier too quickly. To compensate for this condition, the amplifier supply voltage is increased to yield the required output power. The shorter duration of the energy charge cycle leads to a significant increase in the voltage to which the switching device is exposed. This is done in order to capture sufficient energy and results in device body diode conduction during the remainder of the device off period. This period is characterized by a linear increase in device losses as a function of decreasing load resistance RLoad . When operating the Class-E amplifier with a load resistance RLoad that is above the design value see the waveform on the right of figure 3 , the load tends to draw insufficient current from the amplifier, resulting in an incomplete voltage transition. When the device switches there is a residual voltage across the device, which leads to shunt capacitance COSS + Csh losses. This period in the cycle is characterized by an exponential increase in device losses as function of increasing reflected load resistance. \| EPC EFFICIENT POWER CONVERSION CORPORATION \| \| COPYRIGHT 2017 QUICK START GUIDE Given these two extremes of the operating load resistance RLoad , the optimal point between them must be determined. In this case, the optimal point yields the same device losses for each of the extreme load resistance points and is shown in the lower center graph of figure This optimal design point can be found through trial and error, or using circuit simulation.

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Development Board EPC9058 Quick Start Guide

EPC2110 High Frequency Class-E Wireless Power Amplifier

QUICK START GUIDE

Demonstration System EPC9058

The EPC9058 is a high efficiency, differential mode Class-E amplifier development board that can operate up to 15 MHz, including MHz which is popular for wireless power. However, this board is not preconfigured for any particular frequency. The purpose of this development board is to simplify the evaluation process of class-E amplifier technology using FETs by allowing engineers to easily mount all the critical class-E components on a single board that can be easily connected into an existing system.

This board may also be used for applications where a low side switch is utilized. Examples include, and are not limited to, push-pull converters, current-mode Class D amplifiers, common source bi-directional switch, and generic high voltage narrow pulse width applications such as LiDAR.

The amplifier board features the 120 V rated EPC2110 eGaN FET. The amplifier is set to operate in differential mode and can be re-configured to operate in single-ended mode and includes the gate driver and logic supply regulator.

For more information on the EPC2110 eGaN FETs please refer to the datasheet available from EPC at The datasheet should be read in conjunction with this quick start guide.

Table 1 Performance Summary TA = 25°C EPC9058

Symbol Parameter

Conditions

Min Max Units

Class-E Configuration 0 20 V

Main Supply Voltage Current Mode Class-D

Range

Configuration

Push-Pull Configuration 0 52 V

Control Supply Input Range
7 12 V

IOUT

Switch Node Output Current each

VOSC

Oscillator Input Threshold

Input ‘Low’

Input ‘High’
* Maximum current depends on die temperature actual maximum current will be subject to switching frequency, bus voltage and thermals.

DETAILED DESCRIPTION

The Amplifier Board EPC9058

Figure 1 shows the schematic of a single-ended, Class-E amplifier with ideal operation waveforms where the amplifier is connected to a tuned load such as a highly resonant wireless power coil. The amplifier has not been configure due to the specific design requirements such as load resistance and operating frequency. The design equations of the specific ClassE amplifier support components are given in this guide and specific values suitable for a RF amplifier application can then be calculated.

Figure 2 shows the differential mode Class-E amplifier EPC9058 demo board power circuit schematic. In this mode the output is connected between Out 1 and Out A block-wave external oscillator with 50 % duty cycle and 0 V 5 V signal amplitude is used as a signal for the board. Duty cycle modulation is recommended only for advanced users who are familiar with the Class-E amplifier operation and require additional efficiency.

The EPC9058 is also provided with a 5 V regulator to supply power to the logic circutis and gate driver. Adding a 0 Ω resistor in position R90 allows the EPC9058 to be powered using a single-supply voltage however in this configuration the maximum operating voltage is limited to between 7 V and 12 V.

Single-ended Mode operation

Although the default configuration is differential mode, the demo board can be re-configured for single-ended operation by shorting out C74 which disables only the drive circuit and connecting the load between Out 1 and GND only see figures 2 and 5 for details .

Class-E amplifier operating limitations

The impact of load resistance variation is significant to the performance of the Class-E amplifier, and must be carefully analyzed to select the optimal design resistance.

EPC9058 amplifier board.

The impact of load resistance RLoad Real part of ZLoad variation on the operation of the Class-E amplifier is shown in figure When operating a Class-E amplifier with a load resistance RLoad Real part of ZLoad that is below the design value see the waveform on the left of figure 3 , the load tends to draw current from the amplifier too quickly. To compensate for this condition, the amplifier supply voltage is increased to yield the required output power. The shorter duration of the energy charge cycle leads to a significant increase in the voltage to which the switching device is exposed. This is done in order to capture sufficient energy and results in device body diode conduction during the remainder of the device off period. This period is characterized by a linear increase in device losses as a function of decreasing load resistance RLoad .

When operating the Class-E amplifier with a load resistance RLoad that is above the design value see the waveform on the right of figure 3 , the load tends to draw insufficient current from the amplifier, resulting in an incomplete voltage transition. When the device switches there is a residual voltage across the device, which leads to shunt capacitance COSS + Csh losses. This period in the cycle is characterized by an exponential increase in device losses as function of increasing reflected load resistance.
| EPC EFFICIENT POWER CONVERSION CORPORATION | | COPYRIGHT 2017

QUICK START GUIDE

Given these two extremes of the operating load resistance RLoad , the optimal point between them must be determined. In this case, the optimal point yields the same device losses for each of the extreme load resistance points and is shown in the lower center graph of figure This optimal design point can be found through trial and error, or using circuit simulation.

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived EPC9058 Datasheet file may be downloaded here without warranties.

Datasheet ID: EPC9058 510923