TDK-Lambda PH-A280 Series Instruction Manual

TDK-Lambda

PH-A280 Series
INSTRUCTION MANUAL

PH-A280 Series

Instruction Manual

BEFORE USING THE POWER SUPPLY UNIT

Be sure to read this instruction manual thoroughly before using this product. Pay attention to all cautions and warnings
before using this product. Incorrect usage could lead to an electrical shock, damage to the unit or a fire hazard.

DANGER

· Never use this product in locations where flammable gas or ignitable substances are present.

WARNING

· Do not touch this product or its internal components while circuit is live, or shortly after shut down. There may be high
voltage or high temperature present and you may receive an electric shock or burn.

· When the product is operating, keep your hands and face away from it as you may be injured by flying debris in the event
of a fault.

· Do not make unauthorized changes to this product, otherwise you may receive an electric shock and void your warranty.

· Do not use this product in the event of the emission of smoke or abnormal smell and sound etc. It might lead to fire and/or

electric shock. In such cases, please contact us. Do not attempt repair by yourself, as it is dangerous for the user.

· Do not operate these products in the presence of condensation. It might lead to fire and/or electric shock.

· Do not drop or insert anything into the product. It might lead to a failure, fire and/or electric shock.

CAUTION

· This power supply is designed for use within an end product such that it is accessible to SERVICE ENGINEERS only.

· Confirm connections to input/output terminals and signal terminals are correct as indicated in the instruction manual before

switching on.

· Input voltage, Output current, Output power, Base-plate temperature, ambient temperature and ambient humidity should be
kept within specifications, otherwise the product will be damaged or malfunctioned.

· Do not operate and store this product in an environment where condensation might occur. In such case, waterproof
treatment is necessary.

· Never operate the unit under over current or shorted conditions for 30 seconds or more and out of Input Voltage Range as
specification. Insulation failure, smoking, burning or other damage might occur to the unit.

· Do not use this product in environment with a strong electromagnetic field, corrosive gas or conductive substances.

· For applications which require very high reliability (Nuclear related equipment, traffic control equipment, etc.), it is

necessary to provide a fail safe mechanism in the end equipment.

· The information in this document is subject to change without prior notice. Please refer to the latest version of the data
sheet, etc., for the most up-to date specifications of the product.

· No part of this document may be copied or reproduced in any form without prior written consent of TDK-Lambda.

· Do not inject abnormal voltages into the output or signal of this product. The injection of reverse voltage or over voltage

exceeding nominal output voltage into the output or signal terminals might cause damage to internal components.

· Operation of this product under over-current or short circuit conditions can result in damage. Failures of the product under
these conditions have been assessed and are considered to be safe within the meaning of IEC/UL/CSA 60950-1.

· On the occasion of obtain of Safety Standard, this power supply is not considered for connect between +Vin terminal and
earth.

· In order to maintain SELV output, the base-plate must be protectively earthed in the end application. Where the base-plate
is not earthed, the output must be considered hazardous and must not be made user accessible.

· The output of this product may, under fault conditions, exceed SELV voltage limits. Therefore the output must be earthed
in the end equipment to maintain SELV. If the output is not earthed, they must be considered hazardous and must not be
made user accessible.

· The application circuits and their parameters are for reference only. Be sure to verify effectiveness of these circuits and
their parameters before finalizing the circuit design.

· Use an external fuse to each module to ensure safe operation and compliance with the Safety Standards to which it is
approved. Moreover, it is necessary to use fast-blow type when selecting fuse.

C263-04-11A

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Note : CE MARKING

CE Marking when applied to a product covered by this handbook indicates compliance with the low voltage directive
(2006/95/EC) in that it complies with EN60950-1.

TDK-Lambda

PH-A280 Series
INSTRUCTION MANUAL

C263-04-11A

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1. Block Diagram

2. Sequence Time Chart

TDK-Lambda

PH-A280 Series
INSTRUCTION MANUAL

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3. Model name identification method

PH 150 A 280 – 12

4. Terminal Explanation

・Base-plate can be connected to FG (Frame Ground) by M3 threaded holes.
・Connect ＋Vin, －Vin, ＋V, －V with consideration of contact resistance.
・※1：There is no terminal pin.

Output Voltage

Input Voltage

Series Name

Output Power type

Series Name

① －Vin
② CNT
③ ＋Vin
④ －V
⑤ －S
⑥ TRM
⑦ ＋S
⑧ ＋V

TDK-Lambda

PH-A280 Series
INSTRUCTION MANUAL

: －Input Terminal
: ON/OFF Control Terminal
: ＋Input Terminal
: －Output Terminal
: －Remote Sensing Terminal
: Output Voltage Trimming Terminal
: ＋Remote Sensing Terminal
: ＋Output Terminal

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TDK-Lambda

PH-A280 Series
INSTRUCTION MANUAL

5. Terminal connecting method

In order to use the PH-A280 Series, this module must be connected with external components according

to Fig.5-1.
Pay attention to the each wiring. If it is connected to wrong terminal, the power supply will be damaged.
PH-A280 series employs conduction cooling method. Use heat sink and fan to dissipate heat.
For selection of heat sink and heat sink dissipation method, refer to the Power Module Application Note.

Fig.5-1 Basic connection

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F1 : Input Fuse

This PH-A280 Series has no built-in fuse.

Use external fuse to acquire various Safety Standards and to improve safety.
Moreover, use fast-blow type for every power supply.

Furthermore, fuse must be connected to the +Vin side if –Vin side is used as ground, or fuse must be
connected to –Vin side if +Vin side is used as a ground.( However, as mentioned above, the PSU can
consider as Basic insulation only when +Vin and Earth are connected, the safety approval of PSU is not
considered, Please examine together with the system)

Input Fuse Recommended Current Rating :

PH-A280：2A or lower

Consider margin over the actual input voltage to be used when selecting fuse. Moreover, consider I2t fuse
rating for surge current (inrush current) during line throw-in.

C1：

To prevent the effect of input line inductance to the power supply, connect electrolytic capacitor between
+Vin and –Vin terminals.
Take note that in case of large equivalent series resistance (especially operation at low ambient temperature).

Power supply output might not shut down normally.

Recommended Capacitor Value：22μF or more

Moreover, consider to keep margin over the actual input voltage to be used when selecting electrolytic
capacitor.

Note) 1. Use low impedance electrolytic capacitor with excellent temperature characteristics.

(Nichicon CY Series or equivalent)

2. Use more than two recommended capacitor above in parallel when ambient temperature becomes
lower than –20 ºC to reduce ESR.

3. When input line inductance becomes excessively high due to insertion of choke coil, operation of the
power supply could become unstable. For this case, increase C1 value more than the value indicated
above.

4. The module might be damaged by occurrence of surge which is several times the input voltage
due to input line inductance during turn on. Therefore, add electrolytic capacitor at Input
terminal and so on to absorb surge.

Moreover, if slope of input voltage is steep, add electrolytic capacitor so that dv/dt of rise up

slope become less than 20V/μs.

TDK-Lambda

PH-A280 Series
INSTRUCTION MANUAL

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TDK-Lambda

PH-A280 Series
INSTRUCTION MANUAL

C2：

For stable operation of the power supply, add ceramic capacitor of 470 pF or more with high voltage rating
between -Vin terminal and baseplate as close as possible to the terminals. However, if the external FG
capacitor between Output terminal and Baseplate is not used, capacitance value should be less than 4200pF.
If external FG capacitor is used, select capacitance taking into consideration clause 6-21. Withstand Voltage
"Withstand Voltage including external components." Moreover, take note that noise might become large or
stable operation might not be attained due to wiring method of printed circuit board, etc. In such case,
countermeasure is possible by increasing C2 capacitance value or adding common mode choke coil before
C1. Addition of common mode choke coil is recommended to improve EMI. When using multiple power
supplies, add choke to each power supply input.

Recommended Withstand Voltage : more than 2.5kVac

C3 ：

Add ceramic capacitor as close as possible to the terminals of the power supply in order to reduce output
spike noise voltage. (Recommended : 2.2μF)
Take note that, PCB wiring design might influence output spike noise.

C4：

For stable operation, connect a electrolytic capacitor between +V and –V.
Take note that output ripple could be affected by electrolytic capacitor, equivalent impedance and
inductance characteristics of wiring.
For cases of abrupt changes in load current or input voltage, increasing capacitance value of the external
capacitors could reduce the voltage fluctuation.
Model and C4 recommended values of external output capacitor are below.

Table5-1 C4 : Recommended Values of External Output Capacitor

Note) 1. Use low impedance electrolytic capacitor with excellent temperature characteristics.

(Nippon Chemi-Con LXY Series or equivalent)

2. Use more than three recommended capacitor above in parallel when ambient temperature becomes
lower than –20 ºC to reduce ESR.

3. Take note of the allowable ripple current of the capacitor to be used. Especially, for sudden load
current change, verify actual ripple current and make sure that allowable maximum ripple
current is not be exceeded.

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