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3.3 ISPjuno - Power Supply overview
The ISPjuno programmer internal power supply configuration is shown in the overview diagram on the
next page.
The table below refers to the diagram on the next page...
Key
Description
#
1
DC Power Jack Socket
2
USB +5V Port
3
DC / DC Converter
4
DC / DC Boost Circuit
5
LDO
6
LDO Power Supply
7
Target Vcc Switch
8
Target Discharge Circuit
9
Measure V_Target
10
Customer Target PCBA
20
Comments
2.1mm centre positive jack socket
Input 9.0 - 24.0V DC
Connect to PC USB Port
Converts 9.0 – 24.0V input voltage to 5.2V
Boosts the input voltage to ensure it is 5.2V
Low drop-out regulated power supply block
Low drop-out regulated power supply with pre-set voltage
steps
Switch controlling the output of the LDO power supply.
When enabled, this circuit provides a discharge path for any
energy contained in the target system power supply.
Analogue measurement of Target TVCC voltage
PCBA / DUT under test / being programmed
ISPJUNO - Portable ISP Programmer - User Guide V0.84 – 17/04/20
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