DCS04S0A0S06PFA Datasheet DCS04S0A0S06PFA | P10-P12

DS_DCS04S0A0S06NFA_03192012

E-mail: DCDC@delta.com.tw

http://www.delta.com.tw/dcdc

P10

TEST CONFIGURATIONS

Figure 29: Input reflected-ripple test setup

GND

COPPER STRIP

10uF

tantalum

1uF

ceramic

SCOPE

Resistive

Load

Note: Use a 10µF tantalum and 1µF capacitor. Scope

measurement should be made using a BNC connector.

Figure 30: Peak-peak output noise and startup transient

measurement test setup.

SUPPLY

GND

LOAD

CONTACT AND

DISTRIBUTION LOSSES

CONTACT RESISTANCE

Figure 31: Output voltage and efficiency measurement test

setup

Note: All measurements are taken at the module terminals.

When the module is not soldered (via socket), place

Kelvin connections at module terminals to avoid

measurement errors due to contact resistance.

%100)( ×

iVi

IoVo

DESIGN CONSIDERATIONS

Input Source Impedance

To maintain low noise and ripple at the input voltage, it is

critical to use low ESR capacitors at the input to the

module. A highly inductive source can affect the stability

of the module. An input capacitance must be placed close

to the modules input pins to filter ripple current and ensure

module stability in the presence of inductive traces that

supply the input voltage to the module.

The input capacitance should be able to handle an AC

ripple current of at least:

Arms

Vin

Vout

Vin

Vout

IoutIrms













−= 1

DS_DCS04S0A0S06NFA_03192012

E-mail: DCDC@delta.com.tw

http://www.delta.com.tw/dcdc

P11

DESIGN CONSIDERATIONS (CON.)

Safety Considerations

For safety-agency approval the power module must be

installed in compliance with the spacing and separation

requirements of the end-use safety agency standards.

For the converter output to be considered meeting the

requirements of safety extra-low voltage (SELV), the

input must meet SELV requirements. The power module

has extra-low voltage (ELV) outputs when all inputs are

ELV.

The input to these units is to be provided with a

maximum 10A fuse in the ungrounded lead.

Input Under voltage Lockout

At input voltages below the input under voltage lockout

limit, the module operation is disabled. The module will

begin to operate at an input voltage above the under

voltage lockout turn-on threshold.

Over-Current Protection

To provide protection in an output over load fault

condition, the unit is equipped with internal over-current

protection. When the over-current protection is triggered,

the unit enters hiccup mode. The units operate normally

once the fault condition is removed.

FEATURES DESCRIPTIONS

Remote On/Off

The DCS series power modules have an On/Off pin for

remote On/Off operation. Both positive and negative

On/Off logic options are available in the DCS series power

modules.

For negative logic module, connect an open collector

(NPN) transistor or open drain (N channel) MOSFET

between the On/Off pin and the GND pin (see figure 32).

Negative logic On/Off signal turns the module ON during

the logic high and turns the module OFF during the logic

low. When the negative On/Off function is not used, tie the

pin to GND (module will be On).

For positive logic module, the On/Off pin is pulled high

with an external pull-up 5kΩ resistor (see figure 33).

Positive logic On/Off signal turns the module OFF during

logic high and turns the module ON during logic low. If the

Positive On/Off function is not used, tie the pin to Vin.

(module will be On)

On/Off

Vin

GND

ON/OFF

Figure 32: Negaitive remote On/Off implementation

On/Off

Vin

GND

Rpull-

ON/OFF

Figure 33: Positive remote On/Off implementation

Over-Current Protection

To provide protection in an output over load fault

condition, the unit is equipped with internal over-current

protection. When the over-current protection is triggered,

the unit enters hiccup mode. The units operate normally

n i

DS_DCS04S0A0S06NFA_03192012

E-mail: DCDC@delta.com.tw

http://www.delta.com.tw/dcdc

P12

FEATURES DESCRIPTIONS (CON.)

Remote Sense

The DCS provide Vo remote sensing to achieve proper

regulation at the load points and reduce effects of

distribution losses on output line. In the event of an open

remote sense line, the module shall maintain local sense

regulation through an internal resistor. The module shall

correct for a total of 0.5V of loss. The remote sense line

impedance shall be < 10Ω.

Sense

Vin

GND

Distribution Losses

Distribution

Figure 34: Effective circuit configuration for remote sense

operation

Output Voltage Programming

The output voltage of the DCS can be programmed to any

voltage between 0.6Vdc and 3.3Vdc by connecting one

resistor (shown as Rtrim in Figure 35) between the TRIM

and GND pins of the module. Without this external

resistor, the output voltage of the module is 0.6 Vdc. To

calculate the value of the resistor Rtrim for a particular

output voltage Vo, please use the following equation:

Ω













−

= k

Rtrim

6.0

2.1

For example, to program the output voltage of the DCS

module to 1.8Vdc, Rtrim is calculated as follows:

Ω=Ω













−

= KkRtrim 1

6.08.1

2.1

TRIM

GND

RLoad

Rtrim

Figure 35: Circuit configuration for programming output voltage

using an external resistor

Table 1 provides Rtrim values required for some common

output voltages, By using a 0.5% tolerance trim resistor, set

point tolerance of ±1.5% can be achieved as specified in

the electrical specification.

Table 1

0.6V

Open

1.2V

1.5V 1.333K

1.8V

2.5V 0.632K

3.3V 0.444K

Certain restrictions apply on the output voltage set point

depending on the input voltage. These are shown in the

Output Voltage vs. Input Voltage Set Point Area plot in

Figure 36. The Upper Limit curve shows that for output

voltages of 3.3V and lower, the input voltage must be lower

than the maximum of 5.5V. The Lower Limit curve shows

that for output voltages of 1.8V and higher, the input voltage

needs to be larger than the minimum of 2.4V.

Figure 36: Output Voltage vs. Input Voltage Set Point Area plot

showing limits where the output voltage can be set for different

input voltages.

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DCS04S0A0S06PFA

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