Operation; Input And Output Connections; Enabling The Device - Semtech SC202A EVB User Manual

Operation

The SC202A EVB provides several features that make it
easy for the user to evaluate performance without adding
external circuitry or requiring unique test equipment. All
reference designators from the schematic drawing are
used in these descriptions.

Input and Output Connections

This EVB is designed with two diff erent connection points
for the supply and load. Banana jacks are provided at both
the input (J1) and the output (J2) to provide a simple con-
nection method for standard power supplies and
electronic loads. An alternative connection is included for
each jack so that clip leads can be connected or wires
directly soldered to the PCB. TP1-TP2 serve as the connec-
tions for the input supply and TP3-TP4 serve as the
connections for connecting a load to the output.

Enabling the Device

The SC202A is enabled when at least one CTL pin is pulled
high. Jumpers JP1 through JP4 are used to control each
CTL pin according Table 1.
Table1 — Jumper to Control Pin Assignments
Jumper
JP4
JP3
JP2
JP1
The SC202A output voltage is set by putting the jumpers
in the proper confi guration to produce the desired control
pin states. Table 2 describes the state of each jumper for
each corresponding output voltage setting.
Control Pin
CTL3
CTL2
CTL1
CTL0
Table 2 — Jumper States for Each Output Setting
JP4 JP3 JP2
R R R
R R R
R R L
R R L
R L R
R L R
R L L
R L L
L R R
L R R
,L R L
L R L
L L R
L L R
L L L
L L L
Note: R = Right hand position, L = Left hand position
If dynamic control is desired, the jumpers can be removed
and a digital I/O source can be connected to the middle
pin of each jumper. Be careful to set the high and low
voltage levels of the digital I/O source to match the
requirements for these pins as described in the SC202A
product datasheet.
SC202A EVB
Output
JP1
Voltage (V)
R Shutdown
L 0.8
R 1.0
L 1.2
R 1.4
L 1.5
R 1.6
L 1.8
R 1.85
L 1.9
R 2.0
L 2.2
R 2.5
L 2.8
R 3.0
L 3.3
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