Adapter DC2DC_A4 Settings

Electrical characteristics:
Input voltage +5.0V (2-wire cable from ezoflash+ programmer Jp1)
Supply current , max 400mA
Adjustable Vpp output voltages +11.5...14V, +21...26.5V
Ipp max 30mA (Vpp=25V), 40mA (Vpp=21V), 100mA (Vpp=12.8V), 30mA (Vpp=12.8V, Icc=50mA)
Vcc output voltages (only with Vpp=11.5...14V) +5.0 (read/verify) ; +5.8V or +6.2V (programming)
Icc max 100mA (Vpp=12.8V), 50mA (Vpp=12.8V, Ipp=30mA)
Vcc, Vpp switches (BC640) saturation voltage Vce, max 0.1V

dc2dc_a4 adapter on EPROM adapters is inserted in Vcc and Vpp lines from programmer to target EPROM and provides higher voltages required for programming (and erase for electrically erasable EPROM).

How to adjust Vpp ?
Install dc2dc_a4 and eprom adapter without target chip on ezoflash+.
Connect power supply, PC and run SW. Adjust Vpp on LM317- IN with R5.

EPROM with Vcc=5V (read, program), Vpp=25V
Set jumper S, EPROM +5V is powered from programmer .
Adjust Vpp=25.8V on LM317-IN with R5. Output Vpp voltage 24.2-25.8V, Ipp<30mA
Most 2716 chips require Vpp=Vcc in read operation, set jumper T.

EPROM with Vcc=5V (read,program), Vpp=21V
Set jumper S, EPROM +5V is powered from programmer .
Adjust Vpp=21.5V on LM317-IN with R5. Output Vpp voltage 20.5-21.5V, Ipp<40mA

EPROM with Vpp=12.7V, Vcc=5V (read, verify) / 5.8V or 6.2V (programming)
Set jumper R, EPROM Vcc is powered from LM317
Set jumper P , Vpp voltage range 11.5-14.0V
Set jumper M , Vcc=5.8V in programming (Vppin=12.0V from programmer).
Set jumpers M, N; Vcc=6.2V in programming (Vppin=12.0V from programmer).
Adjust Vpp=12.8V on LM317-IN with R5. Output Vpp voltage 12.5-12.8V, Icc<50mA, Ipp<30mA.
Adjust other Vpp value, if required from EPROM datasheets.