Infineon 2ED4820-EM EB2 2HSV48 User Manual page 10

2ED4820-EM EB2 2HSV48
Introduction to the 2ED4820-EM EB2 2HSV48
1.6 Level shifter and end-of-charge detector
The 2ED4820-EM 2HSV48 EB comes with two features external to 2ED4820-EM:
1. High voltage level shifter, to optionally drive the resistive path for capacitor pre-charge either from an
MCU GPIO (P0.14_LSh) or from an external waveform generator (using TP23)
Figure 13 High voltage level shifter.
The level shifter is powered from the Charge pump (VCP) in 2ED4820-EM, which generates a supply 15V above
the 48V supply connected to J15. The charge pump can deliver up to 10mA for such an external circuitry.
J8 allows to select how the resistive path made by U2, U13, R22 and R23 is driven:
Using a jumper on pins 1 & 2, the level shifter drives the resistive path
•
Using a jumper on pins 2 & 3, 2ED4820-EM drives the resistive path from channel A (GA pin)
•
J11 also has to be configured properly, to connect the SA pin of 2ED4820-EM when it is driving the resistive
path: put the jumper on pins 1 & 2.
2. End-of-charge detector, based on a comparator, to detect when the capacitor(s) are sufficiently charged to
switch ON the low-ohmic path.
User Manual
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2022-01-20