TDK-Lambda PH-A280 Series Instruction Manual - Tdk-Lambda
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TDK-Lambda
PH-A280 Series
INSTRUCTION MANUAL
6-3. Maximum Output Ripple and Noise
Measured value according to the specified methods based on JEITA-9141 (Clause 7.12 and clause 7.13) which
is described in the following .
Connect according to Fig. 6-7 and measure. Connect capacitors (C3 : ceramic capacitor , C4 : electrolytic
capacitor) at 50mm distance from the output terminals.
Measure at ceramic capacitor (C3) terminals as shown in Fig. 6-7 using coaxial cable with JEITA attachment.
Use oscilloscope with 100MHz frequency bandwidth or equivalent.
Fig.6-7 Measurement of Maximum Output Ripple and Noise
Take note that, PCB wiring design might influence output spike noise.
Generally, increasing capacitance value of external capacitor can reduce output ripple voltage and output spike
noise.
6-4. Maximum Line Regulation
Maximum value of output voltage change when input voltage is gradually varied (steady state) within specified
input voltage range.
6-5. Maximum Load Regulation
Maximum value of output voltage change when output current is gradually varied (steady state) within
specified output current range.
When using at dynamic load mode, audible noise could be heard from the power module and output voltage
fluctuation might increase. A thorough pre-evaluation must be performed before using this power supply.
6-6. Base-plate Temperature vs. Output Voltage Drift
Output voltage drift is defined as the rate of voltage change when only base-plate temperature is changed during
operation.
6-7. Over Current Protection (OCP)
This power module has built-in OVP function.
When output current is in overload conditions, output voltage is reduced. Output will recover when short circuit
or overload conditions are released. OCP setting value is fixed and therefore, cannot be externally adjusted.
Take note that power module might be damaged at continuous output short circuit or over load conditions
depending on thermal conditions.