Power Supply: Secondary Side; Vdd Selector; Figure 7. Steval-Gla001V1 Evaluation Board Power Supply Primary Side Components; Figure 8. Steval-Gla001V1 Evaluation Board Power Supply Secondary Side Components - STMicroelectronics STEVAL-GLA001V1 User Manual

Figure 7.
Mains voltage
test point
Auxiliary voltage test
point
"Line" and "Neutral" test points are available to measure mains voltage.
An auxiliary power supply is generated to supply the AC switch gate control: it is not regulated (fluctuates from
~12 V to ~23 V), referenced with respect to "Line" potential and can supply up to 150 mA for gate control.
"VCC_AC" and "GND_AC" test points are available to measure the power supply voltage level.
2.5.2

Power supply: secondary side

The power supply secondary side is represented by all the low power output insulated from mains voltage.
The transformer output provides 5 V regulated voltage thanks to an LDO regulator. A 3.3 V regulated voltage is
generated from the 5 V voltage thanks to a second LDO regulator.
Figure 8.
Up to 500 mA can be sunk from the secondary side in all, as the 5 V and 3.3 V voltages are in serial.
The J200 connector can supply another board or other external electronic functions. In this case, you must ensure
that the sum of all current on the secondary side does not exceed the output current capability.
"5VDC", "3.3V OUT" and "GND" test points are available to measure these two low voltages.
2.5.3

VDD selector

Some of the signals (push button, mode switch and ZVS) connected to the STM32 32-bit ARM Cortex MCU or
other microcontroller input are referenced to VDD to protect the voltage input capability of any microcontroller.
UM2304 - Rev 3
STEVAL-GLA001V1 evaluation board power supply primary side components
SIOV100
SW100
STEVAL-GLA001V1 evaluation board power supply secondary side components
Hardware function description
F100
High Voltage
UM2304
C109
D102
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