TDK-Lambda PH-A280 Series Instruction Manual - Tdk-Lambda
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TDK-Lambda
PH-A280 Series
INSTRUCTION MANUAL
6-8. Over Voltage Protection (OVP)
This power module has built-in OVP function.
OVP set point is relative to the rated output voltage value. When output voltage exceed OVP set point, output
voltage shut down. OVP setting value is fixed and therefore, cannot be externally adjusted.
When OVP is triggered, output can be recovered by i) manual reset of the CNT terminal, or ii) by turning input
line off and then turning it on again after the input voltage drops to 0V.
Verifying OVP function shall be done by increasing output voltage with external resistor. For verifying OVP
function, avoid applying external voltage to output terminal because this will cause power supply damage.
6-9. Over Temperature Protection (OTP)
This power module has built-in OTP function. This function operates and shuts down the output when ambient
temperature or internal temperature of power module abnormally rises. OTP operates at 105 ºC to 120 ºC base-
plate temperature.
When module shut down due to over temperature, cool down the baseplate sufficiently and recycle output either
by, recycling the input line after dropping down to 0V, or reset by ON/OFF control function.
However, take note that OTP will operate again unless the cause of abnormal heat of the power module is
eliminated.
6-10. Remote Sensing (+S, –S terminal)
Remote sensing terminal is provided to compensate for voltage drop across the wirings from the power supply
output terminal to the load input terminal.
When remote sensing function is not used (local sensing), short +S terminal to +V terminal and,
–S terminal to –V terminal.
When using remote sensing function, output power of power module should be within maximum output power.
Also, use within maximum output adjustable voltage at output terminal.
Moreover, take note that allowable maximum output current which can be used becomes less than the
specification when output terminal voltage is set higher than rated voltage. (Allowable Maximum Output
Current = Maximum Output Power’s specification ÷ Output terminal Voltage)
When wire is long, Power Supply operation might be unstable due to noise. Moreover, please do enough prior
evaluation for remote sensing function by using shielded wire, twist pair, or parallel pattern.
Fig.6-8 Remote Sensing is used
Fig.
6-9
Remote Sensing is not used
(Local Sensing)