Delta Electronics DNS SIP Series Bedienungsanleitung PDF herunterladen (Seite 9)

DS_DNS10SIP06_03092009

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

DNS 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 25

shows the circuit configuration for output voltage

margining. If unused, leave the trim pin unconnected.

calculation tool is available from the evaluation

procedure, which computes the values of R

margin-up and

margin-down for a specific output voltage and margin

percentage.

On/Off

Vin

GND

Trim

Rmargin-up

Rmargin-down

Rtrim

Figure 25: Circuit configuration for output voltage margining

Voltage Tracking

The DNS family was designed for applications that have

output voltage tracking requirements during power-up

and power-down. The devices have a TRACK pin to

implement three types of tracking method: sequential

start-up, simultaneous and ratio-metric. TRACK simplifies

the task of supply voltage tracking in a power system by

enabling modules to track each other, or any external

voltage, during power-up and power-down.

By connecting multiple modules together, customers can

get multiple modules to track their output voltages to the

voltage applied on the TRACK pin.

FEATURE DESCRIPTIONS (CON.)

Table 1 provides Rtrim values required for some common

output voltages, while Table 2 provides value of external

voltage source, Vtrim, for the same common output

voltages. By using a 1% tolerance trim resistor, set point

tolerance of ±2% can be achieved as specified in the

electrical specification.

Table 1

VO (V) Rtrim (KΩ)

0.7525 Open

1.2 22.464

1.5 13.047

1.8 9.024

2.5 5.009

3.3 3.122

5.0 1.472

Table 2

VO (V) Vtrim (V)

0.7525 Open

1.2 0.670

1.5 0.650

1.8 0.630

2.5 0.583

3.3 0.530

5.0 0.4167

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

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