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4．Explanation of Function and Precautions
4-1. Input Voltage Range
Input voltage range is single phase 85-265VAC(47-63Hz) or 120-370VDC. Input voltage, which is out of specification, might lead unit
damage. For cases where conformance to various safeties required, described as 100-240VAC (50-60Hz).
4-2. Output Voltage Range
Output voltage is set the rated value at shipment. V.ADJ trimmer (VR51) can adjust the output voltage within the range. Output voltage range
is within output voltage variable range. To turn the trimmer clockwise, the output voltage will be increased. Take note when the output
voltage is increased excessively, over voltage protection (OVP) function may trigger and voltage will be shut down. Furthermore, when
increasing the output voltage reduce the output current so as not to exceed the maximum output power.
4-3. Inrush Current
This series equipped Power thermistor to limit the inrush Current. This series are Power thermistor method so that higher current will flow at
higher ambient temperature or re-input condition. Please select input switch and fuse carefully with the high temperature and re-input the
power condition. The Inrush Current value is under cold start at 25℃ in the specification.
4-4. Over Voltage Protection (OVP)
The OVP function (Inverter shut down method, manual reset type) is provided. OVP function operates within ZWS50-150BAF 3.3V: 115% -
150%, 5V: 115%- 140%, 12V-48V: 115%-135% of nominal output voltage, ZWS300BAF 24V : 120%-140%, 12V,15V,36V,48V :
115%-135% of nominal output voltage. When OVP triggers, the output will be shut down. To reset OVP, remove the input of power supply
for a few minutes, and then re-input. In addition, the setting value of OVP is fixed and not adjustable. Pay attention not to apply higher
voltage externally to the output terminal to avoid unit failure. In case of inductive load, put protective diode in series to the output power line.
4-5. Over Current Protection (OCP)
・ZWS50BAF, ZWS75BAF : Fold back limit and Hiccup mode with automatic recovery.
・ZWS100BAF, ZWS150BAF : 3.3V, 5V Constant current limit and Hiccup mode near shorted conditions with automatic recovery.
・ZWS300BAF//
OCP function operates when the output current exceeds 105% of maximum DC output current of specification. The outputs will be
automatically recovered when the overload condition is canceled. Never operate the unit under over current or shorted conditions, which may
leads damage or insulation failure. OCP setting is fixed and not to be adjusted externally.
4-6. Output Ripple & Noise
The standard specification for maximum ripple value is measured according to measurement circuit specified by JEITA-RC9131B. When
load lines are longer, ripple will becomes larger. In this case, electrolytic capacitor, film capacitor, etc. might be necessary to use across the
load terminal. The output ripple cannot be measure accurately if the probe ground lead of oscilloscope is too long.
Power
Supply
: 12V - 48V Constant current limit with automatic recovery.
: 12V - 48V Constant current limit with automatic recovery.
150mm
+
C1
‐
A
Load
C2
Coaxial Cable
R1
1.5m 50Ω
-4-
TDK-Lambda
ZWS-BAF Series
Instruction Manual
C1 : 0.1uF
Film Cap.
C2 : 100uF Electric Cap.
C3 : 4700pF Ceramic Cap.
R1 : 50Ω
Oscilloscope
Bandwidth : 100MHz
C3
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