DCS04S0A0S06PFA Datasheet DCS04S0A0S06PFA | P13-P15

DS_DCS04S0A0S06NFA_03192012

E-mail: DCDC@delta.com.tw

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

P13

When an analog voltage is applied to the SEQ pin, the

output voltage tracks this voltage until the output reaches

the set-point voltage. The final value of the SEQ voltage

must be set higher than the set-point voltage of the

module. The output voltage follows the voltage on the

SEQ pin on a one-to-one basis. By connecting multiple

modules together, multiple modules can track their output

voltages to the voltage applied on the SEQ pin.

For proper voltage sequencing, first, input voltage is

applied to the module. The On/Off pin of the module is

left unconnected (or tied to GND for negative logic

modules or tied to VIN for positive logic modules) so that

the module is ON by default. After applying input voltage

to the module, a minimum 10msec delay is required

before applying voltage on the SEQ pin. This delay gives

the module enough time to complete its internal power-up

soft-start cycle. During the delay time, the SEQ pin

should be held close to ground (nominally 50mV ± 20

mV). This is required to keep the internal op-amp out of

saturation thus preventing output overshoot during the

start of the sequencing ramp. By selecting resistor R1

(see Figure. 38) according to the following equation

Ω













−

05.0

24950

Vin

The voltage at the sequencing pin will be 50mV when the

sequencing signal is at zero.

FEATURE DESCRIPTIONS (CON.)

The amount of power delivered by the module is the

voltage at the output terminals multiplied by the output

current. When using the trim feature, the output voltage of

the module can be increased, which at the same output

current would increase the power output of the module.

Care should be taken to ensure that the maximum output

power of the module must not exceed the maximum rated

power (

Vo.set x Io.max ≤ P max).

Voltage Margining

Output voltage margining can be implemented in the DCS

modules by connecting a resistor, R

margin-up, from the Trim

pin to the ground pin for margining-up the output voltage

and by connecting a resistor, R

margin-down, from the Trim pin

to the output pin for margining-down. Figure 3 shows the

circuit configuration for output voltage margining. If

unused, leave the trim pin unconnected.

A calculation tool

is available from the evaluation procedure which

computes the values of R

margin-up and Rmargin-down for a

specific output voltage and margin percentage.

On/Off

Vin

GND

Trim

Rmargin-up

Rmargin-down

Rtrim

Figure 37: Circuit configuration for output voltage margining

Output Voltage Sequencing

The DCS 12V 6A modules include a sequencing feature,

EZ-SEQUENCE that enables users to implement various

types of output voltage sequencing in their applications.

This is accomplished via an additional sequencing pin.

When not using the sequencing feature, either tie the SEQ

pin to VIN or leave it unconnected.

DS_DCS04S0A0S06NFA_03192012

E-mail: DCDC@delta.com.tw

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

P14

FEATURE DESCRIPTIONS (CON.)

After the 10msec delay, an analog voltage is applied to

the SEQ pin and the output voltage of the module will

track this voltage on a one-to-one volt bases until the

output reaches the set-point voltage. To initiate

simultaneous shutdown of the modules, the SEQ pin

voltage is lowered in a controlled manner. The output

voltage of the modules tracks the voltages below their

set-point voltages on a one-to-one basis. A valid input

voltage must be maintained until the tracking and output

voltages reach ground potential.

When using the EZ-SEQUENCETM feature to control

start-up of the module, pre-bias immunity during startup is

disabled. The pre-bias immunity feature of the module

relies on the module being in the diode-mode during

start-up. When using the EZ-SEQUENCETM feature,

modules goes through an internal set-up time of 10msec,

and will be in synchronous rectification mode when the

voltage at the SEQ pin is applied. This will result in the

module sinking current if a pre-bias voltage is present at

the output of the module.

Figure 38: Circuit showing connection of the sequencing signal to

the SEQ pin.

Monotonic Start-up and Shutdown

The DCS 6A modules have monotonic start-up and

shutdown behavior for any combination of rated input

voltage, output current and operating temperature range.

DS_DCS04S0A0S06NFA_03192012

E-mail: DCDC@delta.com.tw

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

P15

THERMAL CONSIDERATIONS

Thermal management is an important part of the system

design. To ensure proper, reliable operation, sufficient

cooling of the power module is needed over the entire

temperature range of the module. Convection cooling is

usually the dominant mode of heat transfer.

Hence, the choice of equipment to characterize the

thermal performance of the power module is a wind

tunnel.

Thermal Testing Setup

Delta’s DC/DC power modules are characterized in

heated vertical wind tunnels that simulate the thermal

environments encountered in most electronics

equipment. This type of equipment commonly uses

vertically mounted circuit cards in cabinet racks in which

the power modules are mounted.

The following figure shows the wind tunnel

characterization setup. The power module is mounted

on a test PWB and is vertically positioned within the

wind tunnel.

Thermal Derating

Heat can be removed by increasing airflow over the

module. To enhance system reliability, the power

module should always be operated below the maximum

operating temperature. If the temperature exceeds the

maximum module temperature, reliability of the unit may

be affected.

AIR FLOW

MODU LE

PW B

50. 8(2. 00")

AIR VELOCITY

A ND AM BI ENT

TEMPERATURE

SURED BELOW

THE MODULE

FAN CING PWB

Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)

Figure 39: Wind tunnel test setup

THERMAL CURVES

Figure 40: Temperature measurement location

The allowed maximum hot spot temperature is defined at 109

℃

DCS04S0A0S06 Output Current vs. Ambient Temperature and Air Velocity

@Vin=5V Vout=3.3V (Either Orientation)

25 30 35 40 45 50 55 60 65 70 75 80 85

Output Current (A)

Ambient Temperature (℃)

Natural

Convection

Figure 41: Output current vs. ambient temperature and air

velocity@Vin=5V, Vout=3.3V(Either Orientation)

DCS04S0A0S06 Output Current vs. Ambient Temperature and Air Velocity

@Vin=5V Vout=2.5V (Either Orientation)

25 30 35 40 45 50 55 60 65 70 75 80 85

Output Current (A)

Ambient Temperature (

℃

)

Natural

Convection

Figure 42: Output current vs. ambient temperature and air

velocity@Vin=5V, Vout=2.5V(Either Orientation)

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DCS04S0A0S06PFA

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