Power supply
The SPS200 is supplied with 24 V via the barrel connector (grey) or via the 2-position +/- terminal block (green). Turn the switch on (pink). The PWGD LED lights up when the board is powered.
Output terminal block connections
- +VCC: Positive output, configurable with +VCC SET switch (red)
- -VCC: Negative output, configurable with -VCC SET switch (blue)
Enable / Disable
A 3.3 V TTL signal (5 V compatible) can be connected to the DIS terminal block. When the signal is high, the outputs are disabled. If unused, leave unconnected.
Output voltages configuration
The output voltages +VCC and -VCC are set using the +VCC SET and -VCC SET switches, respectively, using the formula:
where:
- SWX = 0 when OFF and SWX = 1 when ON.
- VCC0 = 5 V for SPS200-PN/PP and VCC0 = 11 V for SPS200-PN-HV.
Examples
+VCC = 9.5 V (5 V + 1 × 4 V + 0 × 2 V + 0 × 1 V + 1 × 0.5 V = +9.5 V):
+VCC = 6 V (5 V + 0 × 4 V + 0 × 2 V + 1 × 1 V + 0 × 0.5 V = 6 V):
Operating limits
The total ouput power of the SPS200-PN (positive output + negative output) must be kept below 36 W (48 W for the SPS200-PP). In addition to that, the output currents must be kept within the limits defined in the diagram below:
Mounted shield
The mounted shield option (-SHLD) provides an aluminium shield on top of the SPS200 switching converters. The shield helps mitigate radiated noise when the SPS200 is placed in close proximity with sensitive electronics, as it is often required in space constrained systems. To illustrate the shielding efficiency, we placed a SPS200-PN near an AMP200-10k low-noise voltage preamplifier.
The SPS200-PN is configured to output ± 12 V. An extra 10 Ω load is added on each output, resulting in about 29 W output power. The extra load significantly increases the switched currents, and therefore the radiated emissions.
The figure below shows the AMP200-10k input-referred voltage noise (input terminated with 50 Ω and gain set to 10) without and with the shield mounted on the SPS200-PN.
